References of "Scientific congresses and symposiums"
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See detailStructural design considering damage within an XFEM-level set framework
Noël, Lise ULg; Duysinx, Pierre ULg; Maute, Kurt

Conference (2016, September)

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See detailConclusion
Veymiers, Richard ULg

Conference (2016, September)

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See detailGay adoptive families: between stressors and losses. 2 contrasted cases
Messina, Roberta ULg; D'Amore, Salvatore ULg

Conference (2016, September)

Gay adoptive families are more and more present in the European context (currently the full joint adoption by same sex couples is granted in 9 European countries and 4 countries permit the step-child ... [more ▼]

Gay adoptive families are more and more present in the European context (currently the full joint adoption by same sex couples is granted in 9 European countries and 4 countries permit the step-child adoption). Despite the numerous studies on lesbian and gay parent- headed families, the current literature that has focused specifically on gay adoptive parent families remains rather limited. This research has the aim of increase the scientific knowledge on this new family form with the purpose to shed light on typical stressors experienced by parents and by children. The specificity of these families consists, among others, to be at the crossroads of two levels of complexity: being adoptive families and being LG families. Like all LG families, gay adoptive families have to face different stressors such as the lack of support by families of origin and social context, the need to hide their parenting project, the fear to not be considered parents "like the others" and the worry that their children are discriminated because of parents’ homosexuality. In addition to these stressors linked to the family structure, there is the challenge to adopt a child already marked by difficult life experiences and abandonment. The specificity of these families is the product of the difficulties encountered from the couples to became parents and of the experience of loss experienced by the child. The result of this whole meeting, is often found in parents’ strategies to face stressors and in the weight that the loss takes on for the child and in the relational dynamics of the family. Through two contrasting cases we will reflect on the possible adaptive strategies of parents and on the importance of integrating the child history in a new family story in which past, present and future come together and don’t know fractures. [less ▲]

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See detailCreating undocumented EU migrants through welfare: The case of Belgium
Lafleur, Jean-Michel ULg; Mescoli, Elsa ULg

Conference (2016, September)

In the dual context of increased Central and Eastern European migration and of the global financial and economic crisis, several Northern European Member States have implemented (or debated) reforms of ... [more ▼]

In the dual context of increased Central and Eastern European migration and of the global financial and economic crisis, several Northern European Member States have implemented (or debated) reforms of their welfare regimes to restrict access to migrants coming from other EU Member States. As the debates on the so-called “welfare tourism” are intensifying in different parts of the EU, we can observe a growing trend among Member States to use welfare policies as instruments to limit the mobility of certain EU migrants. This stance is best illustrated with Prime Minister Cameron’s demand for four-year ban on EU migrants claiming in-work benefits. In Belgium, too, EU citizens have been particularly affected by this adverse context as the Migration Office (Office des Etrangers) has intensified controls against EU residents receiving welfare benefits. With this policy, authorities have been using a restrictive interpretation of the European Directive 2004/38 that allows Member States to remove residence permits from EU citizens who represent an “unreasonable burden on state finances”. As a consequence, the number of EU citizens expelled from Belgium on a yearly basis has jumped from 343 to 2,042 between 2010 and 2014. In this paper, we propose to focus on those EU citizens who see their freedom of circulation in the EU restricted after claiming social protection in their country of residence. Relying on fieldwork conducted with Italian and Romanian migrants who experienced the removal of their residence permit, we discuss the different resilience strategies of those EU citizens faced with the legal obligation to leave: such strategies include returning to the homeland, refusing to leave, mobilizing the support of migrant organizations, introducing individual appeals, and seeking to regularize their administrative status. In particular, we shall focus on the experience of EU migrants who have decided to stay in Belgium and experience the status of an undocumented EU migrant. This peculiarity of this status is visible in three respects: 1) expulsion is not enforced by local authorities, 2) migrants continue to be able to circulate between their homeland and the country where they no longer have a residence permit, and 3) they have a possibility to regularize their status if they can demonstrate to municipal authorities that they no longer represent “a burden” on Belgium’s public finances. Overall, confronting our data to the rich literature on undocumented third country nationals, we discuss the limits of EU citizenship as experienced by those who are denied the right to free movement. This paper relies primarily on multi-sited ethnographic fieldwork (in progress) conducted with Italian and Romanian migrants in Brussels and with individuals of the same nationality who decided to leave Belgium and return to their home country after the removal of their residence permit. Additional fieldwork includes semi-directed interviews with civil society organizations, trade unions, and consular authorities. The data collection process started in May 2014 and is expected to be finished in May 2016. [less ▲]

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See detailGait pattern of healthy old people for fast walking condition
GILLAIN, Sophie ULg; Boutaayamou, Mohamed ULg; Schwartz, Cédric ULg et al

in Gerontechnology (2016, September)

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See detailProduction of word stress by French speaking CLIL and non-CLIL learners of Dutch
Hiligsmann, Philippe; Rasier, Laurent ULg; Degrave, Pauline

Conference (2016, September)

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See detailGait pattern of healthy old people for dual task walking condition
GILLAIN, Sophie ULg; Boutaayamou, Mohamed ULg; Schwartz, Cédric ULg et al

in Gerontechnology (2016, September)

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See detailLes corps des scientifiques et de l’intellectuel dans la revue La Recherche
Dondero, Maria Giulia ULg

in Mabrour, Abdel; Bajomée, Danielle (Eds.) La lettre et l’image. Enquêtes interculturelles sur les territoires du visible (2016, September)

Ce travail entend examiner les rapports entre les représentations photographiques des corps des scientifiques dans la revue de vulgarisation savante La Recherche, tels les portraits, les scènes de travail ... [more ▼]

Ce travail entend examiner les rapports entre les représentations photographiques des corps des scientifiques dans la revue de vulgarisation savante La Recherche, tels les portraits, les scènes de travail collectif en laboratoire etc., et les conceptions de la science qui en sont valorisées. L’étude des relations entre les photographies et les textes qui les accompagnent ont ainsi pour objectif de déployer une réflexion non seulement sur les différents types de commensurabilité entre le langage verbal et le langage visuel mais aussi sur le fait que le langage visuel est à même de forger de manière tout à fait autonome des valeurs identitaires et des formes de vie identifiables via l’analyse sémiotique. Notre exploration se développera en deux volets : le premier vise à esquisser la méthodologie de la sémiotique visuelle pour pouvoir introduire les niveaux pertinents de l’analyse sémiotique, le deuxième consiste à analyser un corpus constitué de textes tirés de quelques numéros de la revue La Recherche en en distinguant les différents genres discursifs (entretien, présentation de travaux en cours, etc.) et les différents types de cadrage et de mise en scène photographique afin d’expliquer comment ils se combinent avec les prises de position épistémologiques valorisées. [less ▲]

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See detailMonitoring topography of laboratory fluvial dike models subjected to breaching based on a laser profilometry technique
Rifai, Ismail ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in International Symposium on River Sedimentation: Stuttgart 19th-22d september 2016 (2016, September)

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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 detailThe influence of background noise on vocal loading parameters in music theory teachers
Schiller, Isabel ULg; Morsomme, Dominique ULg; Sfez, Lou et al

Poster (2016, August 23)

Background: Music theory teachers, who teach rhythm, singing and other music-related skills and topics, depend greatly on a well-functioning voice. Unlike other schoolteachers, who primarily use their ... [more ▼]

Background: Music theory teachers, who teach rhythm, singing and other music-related skills and topics, depend greatly on a well-functioning voice. Unlike other schoolteachers, who primarily use their voice as a pedagogic tool, music theory teachers also use it as an instrument. Furthermore, they often engage in vocally demanding free-time activities requiring a singing voice. To date, few studies have specifically looked at the voice use of music theory teachers. This study aims (1) to measure the background noise level and the amount of vocal loading affecting this specific population, and (2) to describe the influence of background noise on vocal loading parameters. Methods: Thirteen French-speaking music theory teachers (9 females and 4 males) working in a music school were monitored for one workweek, using the VoxLog voice dosimeter (Sonvox). To investigate the professional and extra-professional environments, all subjects wore the dosimeter from early morning until the end of the day. The parameters analysed were background noise level, duration of phonation, sound pressure level (SPL) and fundamental frequency (F0) of voice. Results: Overall, the mean background noise level was 75.2 dB (SD=5.4). We measured higher background noise level at work (mean=78.2 dB, SD=5.8) than in the extra-professional environment (mean=72.2 dB, SD=5.2). As expected, a rise in background noise was accompanied by a significant rise in voice SPL in both males and females (r=.61, p<.001). A significant correlation between background noise and F0 was found in females (r=.41, p=.002), but not in males (r=.39, p=.055). Furthermore, our data exhibit a significant correlation between background noise and duration of phonation (r=.05, p<.001). Conclusion: Our data suggest, that in class, music theory teachers must cope with background noise levels that dramatically exceed the limit of 35 dB recommended by the WHO (Inserm, 2006). High background noise levels lead to an increase in voice SPL, a phenomenon known as the Lombard effect (Inserm, 2006). In female subjects, we also observed a rise in F0 further to high background noise. Like Ternström, Södersten, and Bohman’s (2002) study, our data indicate that high background noise levels increase the duration of phonation. In a noisy environment, subjects seem to prolong the voiced segments of speech to make themselves understood. In other words, high background noise levels result in higher vocal loading. In the long run, this may increase the risk of voice disorders such as hyperfunctional dysphonia or vocal fold pathologies consecutive to repeated microtrauma in music theory teachers. [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 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 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 detailA Comparison between four Techniques to Measure Cardiac Output
Pironet, Antoine ULg; Dauby, Pierre ULg; Chase, J. Geoffrey et al

Poster (2016, August 17)

Detailed reference viewed: 13 (2 ULg)
See detailCASTLE4D : The castle of Franchimont
Luczfalvy Jancsó, Andrea ULg; Hoffsummer, Patrick ULg; Billen, Roland ULg et al

Poster (2016, August 16)

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See detailBackground subtraction and background generation
Van Droogenbroeck, Marc ULg

Conference (2016, August 15)

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See detailMEASUREMENT OF MOISTURE DIFFUSIVITY BY INVESTIGATION OF SORPTION ISOTHERM AND MODELING MOISTURE TRANSFER OF MORTAR SUBMITED TO CONVECTIVE DRYING
Kahlerras, Loubna ULg; BELHAMRI, Azeddine; Fraikin, Laurent ULg et al

in kahlerras, loubna (Ed.) Proceedings of The 20th International Drying Symposium (IDS 2016) (2016, August 08)

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes ... [more ▼]

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes. The first experimental campaign was a convective dryer; in the purpose to obtain the drying curves of mortar and the influence of water to cement ratios (W/C) on drying kinetics. A second experimental campaign aims to characterize from textural and hydric point of view, the materials, by mean of DVS (dynamic vapor sorption) In order to obtain sorption cycles and identify the moisture diffusivity coefficient of mortar. The pore size distribution is obtained from sorption cycles and completed by MIP. The contribution of each components of the microstructure to the diffusion is studied. Finally X-ray microtomography is used to measuring the moisture content in the internal structure of mortars during drying. [less ▲]

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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 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 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 detailTechniques et Méthodes nucléaires : Application de la Spectrométrie Gamma au Cameroun
Moyo N., Maurice; Kayo, Steve; Ngelem M., Eric J. et al

Poster (2016, August 04)

L’imaginaire populaire est de plus en plus pessimiste au sujet du mot nucléaire, utilisées selon eux, uniquement pour détruire, en cas de guerre. Une idée reçue, mais presque imposée par l'attitude des ... [more ▼]

L’imaginaire populaire est de plus en plus pessimiste au sujet du mot nucléaire, utilisées selon eux, uniquement pour détruire, en cas de guerre. Une idée reçue, mais presque imposée par l'attitude des pays développés qui donnent l'impression de recourir au nucléaire, le plus souvent, à des fins militaires. Pourtant, les applications du nucléaire sont utiles dans des domaines aussi variés que l'agriculture, la médecine, la détection des fuites dans les barrages, la surveillance de la qualité de l'air, des eaux, des sols, des matériaux de construction, des denrées alimentaires etc. Au Cameroun, l'utilisation des rayonnements ionisants (énergie nucléaire) est en pleine croissance. Ce, spécifiquement dans les domaines médical et industriel. La radioprotection est de plus en plus l’objet des recherches et des mesures au Cameroun. Des techniques d’analyse nucléaires sont également utilisées pour déterminer les risques radiologiques lies aux rayonnements naturels provenant de l’environnement. Dans ce cadre, l’unité de recherche « Physique Fondamentale » de l’université de Douala en collaboration avec l’ANRP (Agence Nationale de RadioProtection) utilise la spectrométrie gamma pour quantifier et qualifier l’exposition des camerounais aux rayonnements. Deux mémoires de master ont à cette occasion révéler le niveau d’exposition due aux rayonnements provenant du sol de l’Université de Douala d’une part et d’autre part l’exposition due aux matériaux de construction dans la ville de Douala. Les études sur les matériaux de construction (ciment utilisé dans la ville de Douala) ont permis d’observer que l’activité spécifique dans les échantillons de ciment varie d’un radionucléide à l’autre. L’estimation des paramètres radiologiques comme (l’activité du radium équivalent Raeq, l’indice du risque externe (Hex) et interne (Hin), le taux de dose absorbée dans l’air et la dose effective annuelle (AEDE) ont montré que l’utilisation comme matériaux de construction du ciment analysé était sans risque particulier. [less ▲]

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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 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 detailEnhancing Cover Song Identification with Hierarchical Rank Aggregation
Osmalsky, Julien ULg; Van Droogenbroeck, Marc ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 17th International for Music Information Retrieval Conference (2016, August)

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features ... [more ▼]

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features, recent work tends to demonstrate that combining similarity estimators based on multiple audio features increases the performance. We improve this approach by using a hierarchical rank aggregation method for combining estimators based on different features. More precisely, we first aggregate estimators based on global features such as the tempo, the duration, the loudness, the beats, and the average chroma vectors. Then, we aggregate the resulting composite estimator with four popular state-of-the-art methods based on chromas as well as timbre sequences. We further introduce a refinement step for the rank aggregation called “local Kemenization” and quantify its benefit for cover song identification. The performance of our method is evaluated on the Second Hand Song dataset. Our experiments show an significant improvement of the performance, up to an increase of more than 200 % of the number of queries identified in the Top-1, compared to previous results. [less ▲]

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See detailEVALUATION OF FISH EXPOSURE TO POP-LIKE (ORGANOTIN) COMPOUNDS IN SEPETIBA BAY (RIO DE JANEIRO STATE, BRAZIL) THROUGH HEPATIC TOTAL TIN CONCENTRATIONS
Paiva, TC; Schilithz, PF; Bisi, TL et al

in Organohalogen Compounds (2016, August)

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See detailOptimal design of flexible mechanisms using a generalized equivalent static load method
Tromme, Emmanuel; Sonneville, Valentin; Guest, James K. et al

in Proceedings of the 24th International Congress of Theoretical and Applied Mechanics (2016, August)

The equivalent static load (ESL) method is a powerful approach to solve dynamic response structural optimization problems. The method transforms the dynamic response optimization into a static response ... [more ▼]

The equivalent static load (ESL) method is a powerful approach to solve dynamic response structural optimization problems. The method transforms the dynamic response optimization into a static response optimization under multiple load cases. The ESLs are defined based on the transient analysis response whereupon all the standard techniques of static response optimization can be used. In the last decade, the ESL method has been applied to perform structural optimization of flexible components of mechanical systems modeled as multibody systems. This method considers the optimization of isolated component during the static response optimization. The present research proposes a generalized ESL method accounting for the entire system during the static response optimization, which enables to formulate the constraints with respect to the mechanism and not restricted to the individual components. The proposed method relies on a Lie group formalism which has appealing properties to derive efficiently the ESL. Examples validate the method. [less ▲]

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See detailLa légation des Pays-Bas en cour de Rome au temps de l’agent Laurent du Blioul (1573-1598): Une légation au cœur des réseaux de la monarchie de Philippe II
Regibeau, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (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 detailOn the compatibility equations in geometrically exact beam finite element
Sonneville; Bruls, Olivier ULg; Bauchau, Olivier A.

in Proceedings of the 12th International Conference on Multibody Systems, Nonlinear Dynamics and Control (MSNDC) within the ASME/IDETC/CIE Conference (2016, August)

This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations ... [more ▼]

This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations, namely the dynamic equilibrium equations are formulated in terms of velocity and strain only. In addition to the well established objectivity and path-independence requirements of the spatial discretization, these compatibility equations show that a consistent spatial interpolation of the velocity field should depend on the curvature of the beam, including initial curvature and curvature from the deformation, and it is shown that this consistency is connected to the ability of the element to represent rigid body motion velocity. A two node interpolation scheme is studied and it appears that, as the element gets smaller under mesh refinement, the effect of this dependency reduces, leading eventually to the classical linear shape functions. [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 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 detailThe dual action of neuroestrogens on sexual behavior
Cornil, Charlotte ULg

Conference (2016, August)

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See detailModelling of multibody systems in the local frame
Bruls, Olivier ULg; Sonneville, Valentin

in Proceedings of the 24th International Congress of Theoretical and Applied Mechanics (ICTAM) (2016, August)

A local frame finite element approach is proposed to describe the kinematics of a flexible multibody system, derive the equations of motion and solve them numerically. It is argued that this approach ... [more ▼]

A local frame finite element approach is proposed to describe the kinematics of a flexible multibody system, derive the equations of motion and solve them numerically. It is argued that this approach leads to reduced geometric nonlinearities and improved computational efficiency. [less ▲]

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See detailFeasibility study of burning neat jatropha oil into a vaporizing burner for household applications.
Sartor, Kevin ULg; Makaire, Danielle; Fontaine, Jean-Marie et al

in Proceedings (2016, August)

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See detailProofing & Reduction Strategies Used by Emergency Residents to Manage Fatigue-related Risk
Berastegui, Pierre ULg; Ghuysen, Alexandre ULg; Nyssen, Anne-Sophie ULg

Poster (2016, July 29)

Fatigue and sleep loss are typically associated with psychomotor and cognitive impairment resulting in poorer task performance. Most of these studies are conducted in controlled settings and involve the ... [more ▼]

Fatigue and sleep loss are typically associated with psychomotor and cognitive impairment resulting in poorer task performance. Most of these studies are conducted in controlled settings and involve the completion of experimental tasks. Only a few field studies involving exhausted residents have been conducted over the past decade, and they yielded to contradictory results (Ellman et al., 2004). One of the key factors that could be involved in the non-linear relationship between fatigue and performance in specific work context reside in the mobilization of Fatigue Proofing Strategies. FPS are adaptive and protective risk-reduction behaviors that improve the resilience of a system of work (Dawson et al., 2012). In this study, we aimed to identify and classify proofing strategies mobilized by EMS residents using an inductive content analysis approach. EMS residents reported a range of strategies for reducing subjective level of sleepiness (reduction strategies, n=15) or managing its consequences (proofing strategies, n=17). Content analysis yielded to three sub-categories of proofing strategies: Behavioral Compensation (n=8), Error’s Opportunity Reduction (n=5) and Error’s Consequences Mitigation (n=4). Our results show that EMS residents use both types of strategies although none of the proofing strategies were part of their training program. Despite the current informal use, there is significant potential for implementation of more formal processes. [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 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 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 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 detailRepetition and Negation as Dialogic Devices in Caryl Phillips's "Northern Lights"
Tunca, Daria ULg

Conference (2016, July 28)

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See detailAharonov-Bohm oscillations of bosonic matter-wave beams in the presence of disorder and interaction
Chrétien, Renaud ULg; Dujardin, Julien; Petitjean, Cyril ULg et al

Poster (2016, July 27)

We study the one-dimensional (1D) transport properties of an ultracold gas of Bose-Einstein condensed atoms through Aharonov-Bohm (AB) rings. Our system consists of a Bose-Einstein condensate (BEC) that ... [more ▼]

We study the one-dimensional (1D) transport properties of an ultracold gas of Bose-Einstein condensed atoms through Aharonov-Bohm (AB) rings. Our system consists of a Bose-Einstein condensate (BEC) that is outcoupled from a magnetic trap into a 1D waveguide which is made of two semi-infinite leads that join a ring geometry exposed to a synthetic magnetic flux φ. We specifically investigate the effects both of a disorder potential and of a small atom-atom contact interaction strength on the AB oscillations. The main numerical tools that we use for this purpose are a mean-field Gross-Pitaevskii (GP) description and the truncated Wigner (tW) method. We find that a correlated disorder suppress the AB oscillations leaving thereby place to Aronov-Al’tshuler-Spivak (AAS) oscillations. The competition between disorder and interaction leads to a peak inversion at Φ = π, that is a signature of a coherent backscattering (CBS) peak inversion. This is confirmed by truncated Wigner simulations. [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 detailBiofilm fermentation for the production of insect pathogenic fungi
Bawin, Thomas ULg; Francis, Frédéric ULg; Delvigne, Frank ULg

Poster (2016, July 27)

Currently, integrated pest management that aims to reduce the use of synthetic insecticides by considering all appropriate alternative methods, is promoted. In that context, insect pathogenic fungi could ... [more ▼]

Currently, integrated pest management that aims to reduce the use of synthetic insecticides by considering all appropriate alternative methods, is promoted. In that context, insect pathogenic fungi could be developed as biopesticides in two ways: spores but also metabolites that are recognized as virulence factors. Targeting adequate fermentation method is an important requirement to obtain fungal products (i.e. spores, enzymes and metabolites) of biotechnological interest. The 'Microbial Processes and Interactions' laboratory has developed an innovative fermentation technology (referred to as ‘biofilm fermentation’) involving the growth of fungal biomass on inert supports that are immersed in a liquid nutrient medium. Confining fungal biomass on immersed inert structures provides a hybrid production system aiming to keep a solid-state physiology for sporulation and secretion of metabolites while controlling fermentation parameters. This research project proposes to transfer this technology to culture insect pathogenic fungi, such as Metarhizium anisopliae, for the production of spores and insecticidal metabolites. Development stages include the qualitative and quantitative characterization of its impact on insecticidal products as well as scale-up to industrial level. [less ▲]

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See detailPolitiques mémorielles et contraintes juridiques
Grandjean, Geoffrey ULg

Conference (2016, July 27)

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See detailQuantitative characterization and calibration of salt water intrusion models with electrical resistivity tomography
Beaujean, Jean; Hermans, Thomas ULg; Vandenbohede, Alexander et al

Poster (2016, July 26)

Groundwater quality and coastal ecosystems in coastal areas are among the most vulnerable as they are threatened by excessive groundwater withdrawals, sea level rise and storm events potentially leading ... [more ▼]

Groundwater quality and coastal ecosystems in coastal areas are among the most vulnerable as they are threatened by excessive groundwater withdrawals, sea level rise and storm events potentially leading to salt water intrusions or infiltration into fresh water aquifers. The environmental protection and sustainable management of these groundwater resources often involves the development and calibration of a groundwater model subsequently used to forecast the total dissolved solid content (TDS). However, groundwater models are often built based on a limited number of sparse data due to borehole availability. Geophysical methods can provide spatially and temporally distributed data for hydrogeological modeling at relatively limited costs. In particular, electrical resistivity tomography (ERT) is very sensitive to the conductivity of pore water which is directly linked to the TDS content. The method is therefore well-suited for the monitoring of salt water intrusions. However, the inversion of ERT data involves a regularization process so that the resulting tomogram is only an estimate of the true resistivity distribution, suffering from smoothing and varying resolution. In many cases, the interpretation of ERT remains qualitative and skewed. In this contribution, we propose two different methods to improve the information content that can be extracted from ERT data. First, we show with a field example from Belgium how alternative regularization methods can be developed to integrate independent information into the inversion process of ERT. This enabled us to obtain a resistivity distribution much closer to the one observed in validation boreholes. Then, a site-specific petrophysical relationship is used to derive the TDS content of the aquifer from ERT tomograms. This can be directly used as input in the calibration process of a hydrogeological model. We also show how it is possible to counterbalance the effect of resolution loss with depth for surface ERT by filtering the results relative to their sensitivity. We show that this filtering is mandatory to use the ERT-derived information for calibrating a hydrogeological model. In a second example, we show how a fully coupled inversion approach can be used to directly invert geophysical data together with hydrogeological data for the calibration of hydrogeological models. At each iteration of the calibration, the simulated TDS content is transformed in a resistivity distribution using a parameterized petrophysical relationship and forward geophysical modeling yields the geophysical response. We show that this approach enables to better estimate the hydrogeological parameters of the simulated coastal aquifer than with an uncoupled approach if the conceptual model is sufficiently representative. With those two examples, we demonstrate the usefulness of ERT in the monitoring of salt water intrusions, both qualitatively to identify most vulnerable zones and quantitatively to estimate ERT-derived TDS contents or geophysical data and calibrate hydrogeological models. An innovative approach may consist in a conjunctive use of filtered geophysically-derived and geophysical data within the coupled hydrogeophysical inversion framework. Such an uncoupled-coupled approach based on a resolution threshold approach may offer a promising developing trend in hydrogeophysical inversion. [less ▲]

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See detailImpacts of entomopathogenic fungi on biology and behaviour of the invasive Brown Marmorated Stink Bug (Hemiptera, Pentatomidae)
Fingu Mabola, Junior Corneille ULg; Serteyn, Laurent ULg; Bawin, Thomas ULg et al

Poster (2016, July 25)

Halyomorpha halys St˚al (Hemiptera, Pentatomidae) is an invasive stink bug coming from Eastern Asia. Besides causing important yields losses in orchards, crop and vegetable fields, it overwinters inside ... [more ▼]

Halyomorpha halys St˚al (Hemiptera, Pentatomidae) is an invasive stink bug coming from Eastern Asia. Besides causing important yields losses in orchards, crop and vegetable fields, it overwinters inside houses as agglomerates of dozens. In Europe, this Brown Marmorated Stink Bug (BMSB) was accidentally introduced in Switzerland in 2007 and has been later observed in surrounding countries (France, Italy, Germany). Based on the current US situation, we can reasonably fear that BMSB will have colonized most of Europe countries in less than a decade. If we already discern a few fungus strains that are efficient against BMSB, very little is known about their actual impact on the insect itself. So we investigated the in- fluence of a fungal infection on insect development parameters and behaviour. Olfactometry was settled to investigate the dispersion and aggregation trends, while electropenetography was used to assess the feeding behaviour. Our results will be discussed to present changes according to healthy/fungus-infected status, in relation to potential biological control for that pest. [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 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 detailThe verbal overshadowing effect in children and adults is unrelated to the specific content of descriptions
Vanootighem, Valentine ULg; Brédart, Serge ULg; Dehon, Hedwige ULg

Poster (2016, July 21)

Verbal descriptions of unfamiliar faces have been found to impair later identification of these faces in children and adults, a phenomenon known as the “verbal overshadowing effect” (VOE, Schooler and ... [more ▼]

Verbal descriptions of unfamiliar faces have been found to impair later identification of these faces in children and adults, a phenomenon known as the “verbal overshadowing effect” (VOE, Schooler and Engstler-Schooler, 1990). The present study thoroughly examined the person descriptive abilities of 7–8, 10–11, and 13–14-year-old children and adults and their influence on later identification performance. Our aim was to specifically assess the prediction of the “content” account suggesting that a verbal overshadowing arises because participants generate an inadequate verbal description and later rely upon it during retrieval. Results showed a verbal overshadowing effect in all age groups but neither accuracy, length nor content of descriptions were found to be associated with identification accuracy. [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)

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

Conference (2016, July 19)

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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 detailRecollection versus familiarity in normal aging and in mild cognitive impairment: Impact of test format.
Simon, Jessica ULg; Gilsoul, Jessica ULg; SALMON, Eric ULg et al

Poster (2016, July 18)

The aim of this study was to investigate the impact of test format on recollection and familiarity in normal aging and in MCI. Seventy young participants, 65 younger-old, 53 older-old, and 13 MCIs were ... [more ▼]

The aim of this study was to investigate the impact of test format on recollection and familiarity in normal aging and in MCI. Seventy young participants, 65 younger-old, 53 older-old, and 13 MCIs were presented with forced-choice and yes/no visual recognition memory tasks with the Remember/Know/Guess paradigm. The young people had better recognition performance than younger-old, who performed better than older-old and MCIs. Recollection and familiarity declined progressively in healthy aging. In MCI, recollection was more affected than familiarity, but patients demonstrated a more liberal use of familiarity. Finally, test format did not influence strongly the results. Young people used recollection more often in the forced-choice task compared to the yes/no task. [less ▲]

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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 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 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 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 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 detailGamma-Ray Spectrometry: Experimental Measurement and Monte Carlo Simulation using GEANT4 toolkit
Guembou Shouop, Cébastien Joel ULg; Ndontchueng Moyo, Maurice; Chene, Grégoire ULg et al

Poster (2016, July 13)

Nowadays the precision in the measurement has become a challenge for physicists. That is why in recent decades, the interest is very granted to simulation. Since 1940, the method Monte Carlo is more ... [more ▼]

Nowadays the precision in the measurement has become a challenge for physicists. That is why in recent decades, the interest is very granted to simulation. Since 1940, the method Monte Carlo is more useful for validation and even for prediction of the results of the experiment. The aim of this study is to validate experimental models. Our laboratories are equipped with HPGe gamma spectrometers for measuring the natural radioactivity, it becomes interesting to compare and even to improve the performance of our system. Geant4 is used for the construction of the geometry of detection, the physics processes and the primary particles. First and prliminary result was prsented in this paper. [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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Peer Reviewed
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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See detailComputerized adaptive testing and multistage testing with R
Magis, David ULg; Yan, Duanli; von Davier, Alina

Conference (2016, July 11)

The goal of this workshop is to provide a practical (and brief) overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST), and illustrate the methodologies and ... [more ▼]

The goal of this workshop is to provide a practical (and brief) overview of the theory on computerized adaptive testing (CAT) and multistage testing (MST), and illustrate the methodologies and applications using R open source language and several data examples. The implementations rely on the R packages catR and mstR that have been already or are being developed and include some of the newest research algorithms developed by the authors. This workshop will cover several topics: the basics of R, theoretical overview of CAT and MST, CAT and MST designs, assembly methodologies, catR and mstR packages, simulations and applications. The intended audience for the workshop is undergraduate/graduate students, faculty, researchers, practitioners at testing institutions, and anyone in psychometrics, measurement, education, psychology and other fields who is interested in computerized adaptive and multistage testing, especially in practical implementations of simulation using R. [less ▲]

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Peer Reviewed
See detailA Novel Methodology for Hybrid Fire Testing
Sauca, Ana ULg; Gernay, Thomas ULg; Robert, Fabienne et al

in Proceedings of the 6th European Conference on Structural Control (2016, July 11)

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is ... [more ▼]

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is calculated separately, here by means of a predetermined matrix. Equilibrium and compatibility at the interface between the tested “physical substructure” and the “numerical substructure” is maintained throughout the test using a dedicated algorithm. The procedures developed so far are sensitive to the stiffness ratio between the physical and the numerical substructure and therefore they can be applied only in some cases. In fire field, the stiffness of the heated physical substructure may change dramatically and the resulting change in stiffness ratio can lead to instability during the test. To overcome this drawback, a methodology independent of the stiffness ratio has been developed, inspired from the Finite Element Tearing and Interconnecting (FETI) method, which has been originally developed for substructuring in numerical analyses. The novel methodology has been successfully applied to a hybrid fire test in a purely numerical environment, i.e. the physical substructure was also modelled numerically. It is shown that stability does not depend on the stiffness ratio and that equilibrium and compatibility can be consistently maintained at the interface during the fire. Finally, the ongoing experimental program aimed at employing and experimentally validating this methodology is described. [less ▲]

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Peer Reviewed
See detailOptimal returnable transport items management
Limbourg, Sabine ULg; Martin, Adeline; Paquay, Célia ULg

Conference (2016, July 11)

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a ... [more ▼]

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a closed-loop supply chain. Face-to-face interviews with senior executives from seven companies involved in RTIs were conducted to gain a thorough understanding of how they manage the flow of RTIs as well as how they determine the number of RTIs needed in a fleet. Results indicate that RTIs managements are quite diverse, that some common beliefs about RTIs do not apply to all RTI types, and that research efforts are needed in the areas of RTI acquisition; warehouse layout, inventory routing problem; production planning and control; tracking and scheduling. [less ▲]

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See detailCounting time measurement and statistics in gamma spectrometry: the balance
Guembou Shouop, Cébastien Joel ULg; Ndontchueng Moyo, Maurice; Chene, Grégoire ULg et al

Poster (2016, July 11)

Nuclear counting statistics at high count rate are assessed on a γ-ray spectrometer set-up. Our typical gamma spectrometry system consists of a High Purity Germanium (HPGe) detector, liquid nitrogen ... [more ▼]

Nuclear counting statistics at high count rate are assessed on a γ-ray spectrometer set-up. Our typical gamma spectrometry system consists of a High Purity Germanium (HPGe) detector, liquid nitrogen cooling system, preamplifier, detector bias supply, linear amplifier, analog-to-digital converter (ADC), multichannel storage of the spectrum, and data readout devices. Although the system is powerful enough for background measurements, it is important, nowadays, to have a great statistical in short time measurement: which is a challenge for scientists. The purpose of this study was to determine the average time for gamma spectrometry measurement. To detect Uranium, Thorium and their respective daughters and Potassium series with a relative related error less than 1%, it was found that it is necessary to count during a minimum of 24 Hours (86,400 s). This result is in accordance to the literature with planar geometry detector. These results conduct us to make the following three guidelines for selecting the detector best suited for an application: 1. The more detector material available (germanium semi-conductor), the higher the full-energy peak efficiency. 2. The smaller the distance between the detector and the source material, the higher the full- energy peak efficiency. 3. While better resolution gives a better MDA, the resolution contributes only as the square root to the MDA value, whereas the MDA is proportional to the full-energy peak efficiency. This idea came to us by comparing the spectra of measuring radioactivity lasts for 12 hours in the day that does not fully covered the night spectra for the same sample. The conclusion after several investigations became clearer: to remove all effects of radiation from outside (earth, sun and universe) our system, it is necessary to measure the background for 24, 48 or 72 hours. In the same way, the samples have to be measures for 24, 48 or 72 hours to be safe to be purified the measurement (equality of day and night measurement). It is also possible to not use the background of the winter in summer. Depend to the energy of radionuclide we seek, it is clear that the most important steps of a gamma spectrometry measurement are the preparation of the sample and the calibration of the detector. [less ▲]

Detailed reference viewed: 19 (4 ULg)
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 ▲]

Detailed reference viewed: 14 (2 ULg)