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See detailUn autre regard sur la participation des écoles et des élèves à l’enquête du PISA
Raiche, Gilles; Béland, Sébastien; Magis, David ULiege

Conference (2017, November 16)

Le Programme international pour le suivi des acquis des élèves (PISA) a pour objectif de produire des indicateurs sur les habiletés et les connaissances qui contribuent au succès des élèves, des écoles ... [more ▼]

Le Programme international pour le suivi des acquis des élèves (PISA) a pour objectif de produire des indicateurs sur les habiletés et les connaissances qui contribuent au succès des élèves, des écoles, des systèmes éducatifs et des environnements d’apprentissage (CMEC, 2015, p. 7). Depuis 2000, l’enquête du PISA est planifiée à tous les trois ans pour les élèves de 15 ans en ciblant spécifiquement les matières suivantes : la compréhension de l’écrit, la culture mathématique et la culture scientifique. Dans le cadre de la dernière passation, les résultats des Canadiens à cette enquête ont été salués dans l’ensemble du pays : les élèves se classent dans le groupe des pays les plus performants pour toutes les disciplines couvertes. Par contre, le taux de participation des écoles ainsi que les taux d’exclusions des élèves au regard de divers handicaps, qui pourraient éventuellement avoir un impact sur les résultats et le classement international, ont été critiqués à travers le pays. Cette présentation a comme objectif d’étudier le rendement des élèves canadiens au programme international des acquis scolaires (PISA) entre 2000 à 2015 en fonction de différentes caractéristiques relatives à la participation des écoles et au taux d’exclusion des élèves présentant certains handicaps. Des modèles de régression linéaire à niveaux multiples sont utilisés à cette fin. [less ▲]

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See detailPratiques d’évaluation des acquis, ancienneté et attitudes face à l’évaluation
Romainville, Marc; Detroz, Pascal ULiege; Auquière, Amélie ULiege et al

Conference (2017, November 16)

La présente communication est issue d’une recherche plus globale visant à identifier et à mieux comprendre les pratiques d’évaluation des acquis des étudiants auxquelles recourent les enseignants de ... [more ▼]

La présente communication est issue d’une recherche plus globale visant à identifier et à mieux comprendre les pratiques d’évaluation des acquis des étudiants auxquelles recourent les enseignants de l’enseignement supérieur et en particulier les facteurs personnels (ancienneté, attitudes vis-à-vis de l’évaluation…) et contextuels (année d’étude, taille du groupe, disciplines…) qui influencent ces pratiques. Les données ont été recueillies en 2016, d’une part, via une enquête en ligne (élaborée à l’aide du logiciel d’enquêtes Qualtrics) auprès d’enseignants de l’enseignement supérieur belge francophone que ce soit à l’Université ou en Hautes écoles (2292 réponses) et, d’autre part, via 37 entretiens semi-structurés individuels réalisés auprès d’un échantillon de ces mêmes enseignants dans des filières d’études contrastées. Les résultats présentés dans le cadre de cette communication ont trait à l’impact de deux variables personnelles : l’ancienneté des enseignants et leurs attitudes vis-à-vis de l’évaluation. Autrement dit, on cherchera à savoir si l’ancienneté et le développement professionnel qui l’accompagne traditionnellement ont des incidences sur le type de pratiques d’évaluation des acquis des enseignants. En particulier, recourent-ils à des outils de plus en plus diversifiés ou ont-ils tendance à se spécialiser dans l’un ou l’autre ? Et si oui, pourquoi ? Accentuent-ils par ailleurs le recours à l’évaluation continue par rapport au poids du contrôle terminal ? On cherchera ensuite à comprendre comment les pratiques se reconfigurent en fonction des attitudes des enseignants vis-à-vis de l’évaluation et en particulier vis-à-vis de sa fonction et de son rapport à l’apprentissage : dans quel sens une conception davantage intégrative de l’évaluation colore-t-elle les pratiques déclarées d’évaluation ? [less ▲]

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See detailDwelling on Dwelling: Home and Nature in (Native) American Literature
Lombard, David ULiege

Conference (2017, November 16)

As Greg Garrard stresses, “[i]nterpretation and critique of the various inflections of dwelling is a major task for ecocritics interested in a predominantly political, rather than moral or spiritual ... [more ▼]

As Greg Garrard stresses, “[i]nterpretation and critique of the various inflections of dwelling is a major task for ecocritics interested in a predominantly political, rather than moral or spiritual, project of cultural critique that can take us beyond pastoral and nature writing, from the landscapes of leisure to the uneven terrain of real work” (2012). In this paper, I will examine American literary texts dealing with representations of dwelling or “home” as a refuge from the “tensions” or problems caused by modern civilisation and technology. Starting with Thoreau’s Walden (1854), I will focus on the relationships between such refuges, the natural environment, and socio-political critique. Indeed, Thoreau’s work displays a philosophy on nature and dwelling that has influenced other writers to ponder on the negative effects that modern technologies, capitalism and consumerism have had on the human self and, more largely, on our physical environment. Adopting an ecocritical perspective, I will therefore consider Thoreau’s stay in Walden Pond as well as Edward Abbey’s house trailer (Desert Solitaire, 1968), Christopher McCandless’s “magic bus” as depicted in Jon Krakauer’s Into the Wild (1992) or Ken Ilgunas’s “vandwelling” (Walden on Wheels, 2013) to study the socio-political and environmental concerns raised by dwelling experiences in such peculiar or isolated “homes”. Finally, I will also briefly discuss the Native American perspective through an analysis of Leslie Marmon Silko’s novel Ceremony (1977) as an example of the Laguna Pueblo’s perception of nature or the “land” as “home”. [less ▲]

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See detailSteering social fields of mobilization in global cities: Latin American transnational political engagement in Brussels
Lara Guerrero, Larisa; Vivas Romero, Maria ULiege

Conference (2017, November 15)

Social scientists and migration scholars have a growing interest in how and why migrants engage in transnational political movements in both their home and host countries. Migrants are active agents ... [more ▼]

Social scientists and migration scholars have a growing interest in how and why migrants engage in transnational political movements in both their home and host countries. Migrants are active agents participating in transnational social movements. They create, transform, and exploit transnational networks to engage in political movements in their homeland and in their hostland from cities. This chapter aims to answer the following questions: how do global cities shape transnational fields of social mobilization? What is the nexus between these transnational fields of social mobilization and access to welfare states? Theoretically, this contribution introduces a new spatial level of analysis to unpack the dynamics and dimensions of migrant social movements organized in global cities. By focusing specifically on the city of Brussels, this contribution analyzes the impact of global cities shaping the capacity and desire of Latin American migrants in engaging in political movements. Empirically, this chapter presents two case studies where Latin Americans living in Brussels engage in political transnational activities to change their living conditions both in their host and home cities. These examples illustrate the role of migrants influencing and shaping welfare-state and political systems in both their sending and receiving societies. [less ▲]

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See detailOut of hospital neonatal resuscitation: a control randomised study
Servotte, Jean-Christophe ULiege; Ghuysen, Alexandre ULiege; Simonet et al

Conference (2017, November 14)

Introduction : En 2014, 64 accouchements inopinés sont survenus en Wallonie. 5,3% des naissances ont nécessité une réanimation néonatale. Or, de nombreux professionnels de l’urgence terminent leur ... [more ▼]

Introduction : En 2014, 64 accouchements inopinés sont survenus en Wallonie. 5,3% des naissances ont nécessité une réanimation néonatale. Or, de nombreux professionnels de l’urgence terminent leur formation avec une expertise insuffisante dans ce domaine (Nadel et al. 2000). En effet, la réanimation néonatale nécessite des compétences cognitives, techniques et comportementales spécifiques (Halamek et al. 2016). Objectifs : Notre étude randomisée contrôlée a évalué l’impact d’une formation utilisant la simulation clinique sur l’évolution des connaissances et des compétences techniques en réanimation néonatale, avec l’hypothèse que cette méthode a un impact supérieur à l’enseignement clinique traditionnel. Matériel & Méthodes : Des infirmiers se spécialisant en soins intensifs et aide médicale urgente (SIAMU) ont été assignés, après randomisation, à un groupe expérimental (GE) ou à un groupe contrôle (GC). Le GE a reçu un cours théorique suivi d’une formation par simulation (2h) et de 4 semaines de stage. Le GC a reçu un cours théorique suivi de 4 semaines de stage. La population a été évaluée à 2 reprises au moyen d’une simulation de réanimation néonatale et de questionnaires: avant et après la formation, à 4 semaines d’intervalle. Deux experts ont évalué à l’aveugle sur base d’une grille critériée les compétences techniques lors de la simulation. Résultats : 36 participants ont été inclus dans l’étude. Les 2 groupes ont amélioré leurs connaissances. Comparativement, le GE a davantage amélioré ses connaissances globales (p = 0,0001) et spécifiques (p = 0,0007). La formation a permis une amélioration des compétences techniques de 83,3% pour le GC et de 175% pour le GE. Cette différence est significative (p = 0,003). Conclusions : Les deux méthodes pédagogiques ont amélioré les connaissances et les compétences techniques des infirmiers SIAMU. Toutefois, l’impact est significativement supérieur en faveur de la formation utilisant la simulation par rapport à l’enseignement clinique traditionnel. [less ▲]

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See detailDie Rhetorik des Friedens von Romain Rolland: ein Einfluß von Nietzsche
Franck, Thomas ULiege

Conference (2017, November 11)

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See detailAction-Based Language Gestalts in Working Memory
Dumitru, Magdalena ULiege

Conference (2017, November 11)

While evidence is mounting that perceptual grouping cues bene t working memory performance, it is debatable whether this is the main purpose of Gestalt formation. Indeed, recent ndings by Dumitru and ... [more ▼]

While evidence is mounting that perceptual grouping cues bene t working memory performance, it is debatable whether this is the main purpose of Gestalt formation. Indeed, recent ndings by Dumitru and colleagues demonstrate that people build language Gestalts that encode basic action patterns when reasoning with the connectives ‘and’ and ‘or’. Here we present novel evidence from dual memory tasks that Gestalt formation and maintenance breaks down under high working memory load for two age groups (18 to 30 year olds and 60 to 80 year olds). More importantly, the number of Gestalts evoked by the connectives (one for conjunction and two for disjunction) as well as the age-speci c performance levels with visual Gestalts predict the observed e ects. Well-established mappings between language and action patterns are thus a driving factor of Gestalt building and management in working memory. [less ▲]

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See detailRapid changes in preoptic estradiol concentration during male sexual behavior
de Bournonville, Marie-Pierre ULiege; de Bournonville, Catherine; Ball, Gregory et al

Poster (2017, November 11)

Estrogens such as estradiol (E2) exert pleiotropic effects on physiological and behavioral responses such as neuroprotection, aggression or reproduction. Estrogens derived from local brain synthesis ... [more ▼]

Estrogens such as estradiol (E2) exert pleiotropic effects on physiological and behavioral responses such as neuroprotection, aggression or reproduction. Estrogens derived from local brain synthesis (neuroestrogens) are critical for the regulation of different functions including the control of male sexual behavior. Classically, E2 acts through effects initiated in the nucleus to regulate male sexual function. Along with these long-term effects, E2 also acts rapidly (within minutes) via membrane-initiated events. These effects are thought to depend on short-term variations in the local production of estrogens, through rapid fluctuations of the enzymatic activity of brain aromatase. In Japanese quail, rapid modulations of brain aromatase activity (AA) have been reported after sexual interactions or exposure to an acute stress. These changes take place mainly in the medial preoptic nucleus (POM), a sexually differentiated structure that plays a key role in the control of male sexual behavior and where aromatase is densely expressed. Yet, it has recently been shown that, in the short term, AA does not always reflect local E2 concentration. This study was designed to determine by in vivo microdialysis whether local E2 concentrations fluctuate during sexual interactions and test whether these changes parallel the decrease in AA observed ex vivo after copulation. We first conducted a series of experiments to validate the microdialysis and E2 assay. When dialysis probes were placed in successive baths containing known increasing amounts of E2, proportional changes in E2 concentration were measured in the dialysate. Moreover, a rise in E2 concentration was detected after in vivo retrodialysis of testosterone only if the probe was located within the POM and, after a peripheral injection of E2, a sharp rise of E2 was detected regardless of the probe location. Together these results show that in vivo microdialysis is a valid method to assess endogenous fluctuations of brain E2 concentrations in behaving animals. Two independent experiments then identified a rise in E2 concentrations in POM during sexual interactions. This increase occurred within 10 min after the initiation of the sexual interaction and was specific to the POM as there was no increase in E2 concentrations in males that had their cannula outside of this area. Together these data confirm that rapid changes in AA measured ex vivo cannot be considered as a reliable proxy for E2 concentrations. The discrepancies could originate either from the different time resolution related to the two techniques or from differences in the microenvironment in which aromatase functions in vivo and during ex vivo assays. [less ▲]

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See detailImplementation of "Parler-Bambin" preventive program in the multilingual and multicultural context of nurseries/daycares in Lebanon
Moitel ép Messarra, Camille ULiege; Maillart, Christelle ULiege

Poster (2017, November 10)

This project is targeting prevention programs for language and communication difficulties in nurseries in Lebanon. More specifically, it will explore the implementation of a preventive program to enhance ... [more ▼]

This project is targeting prevention programs for language and communication difficulties in nurseries in Lebanon. More specifically, it will explore the implementation of a preventive program to enhance language skills in early childhood, and to specify the role of the Speech and Language Therapist (SLT) in this implementation. There is a growing consensus among researchers and clinicians that abilities acquired at an early age, especially in oral language, are predictive of children's academic performance and future social integration (Zorman, 2011). Preventive actions are increasingly recognized as a priority to improve public health worldwide (Law et al., 2013). In Lebanon, an ongoing national program (MHPSS 2015-2021 - MHPSS, Preventive and Curative, Ministry of Public Health, 2015) is taking part of this kind of healthcare development. Aims: Thus, taking into account some variables that affect the implementation process (environment communities, providers, prevention delivery system and the prevention support system), the aims of this project are 1) to study the feasibility of a preventive program model, that partners Speech and Language Therapist and educators or caregivers in daycare and nurseries, to facilitate language and communication in Lebanese toddlers (under 3 years old), 2) determine the success factors of the implementation. It will be based on a French program “Parler Bambin”, which is currently widely developed in France. Method: The first study will focus on the factors of engagement of different stakeholders in a prevention program: firstly, by identifying the professionals involved in nurseries in Lebanon and then identifying the characteristics of these stakeholders in diverse childcares. Data will be gathered through a questionnaire constructed or adapted from existing questionnaires for this purpose (eg, Preschool Teacher Literacy Beliefs Questionnaire [TBQ], Hindman and Wasik, 2008). Similarly, the questionnaires will address SLT’s representations about their role in supporting language in nurseries. Nominal groups or focus groups (Baribeau and Germain, 2010) and questionnaires will be also carried out to identify the facilitators of this kind of preventive actions and the specific needs of SLTs in preventive settings. A second phase will target the implementation process itself: adapting and implementing a preventive intervention, while taking into consideration implementation aspects. We will find out major variables that are worthy for the program’s implementation, by measuring its fidelity (dosage, quantity, intervention strength, quality, participant responsiveness, program differentiation, etc.), also using videos and direct coaching sessions. Pre and posttest measures will be applied on children (MCDI -The MacArthur communicative development inventories, Fenson et al., 1996; Questionnaire for parents of bilingual children LITMUS-PABIQ, COST IS0804, validation in Lebanon, Tuller 2015). Finally, following the pilot study, the implementation of the adapted program will be proposed according to different execution modalities to support its implementation: with a direct or indirect involvement of an SLT. It will be tested more widely, with particular focus on the role of the speech therapist. Evaluation measures similar to those presented in Phase 2 will be carried out. Expected results: This project will highlight the added value of speech therapy in setting up a prevention program. It also participates in the elaboration of a national strategic framework for the Speech and Language Therapy [less ▲]

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See detailTeacher-SLT co-intervention program to support language in kindergartens in Lebanon: methodology, procedures and measures
El Kouba, Edith ULiege; Maillart, Christelle ULiege

Poster (2017, November 10)

Background: The aim of this project is to develop a co-intervention program, lead by a teacher and an SLT, to support oral language in preschoolers in the Lebanese context (multicultural, multilingual ... [more ▼]

Background: The aim of this project is to develop a co-intervention program, lead by a teacher and an SLT, to support oral language in preschoolers in the Lebanese context (multicultural, multilingual). Actually, there is a growing consensus, that efforts to enhance children’s early language skills, can improve their reading skills and long-term academic achievement. However, some children are at risk of delays due to diverse environments (e.g. low socioeconomic status), and impoverished language and literacy experiences. Thus, international recommendations highlight the necessity for SLTs to conceptualize their intervention, according to community based needs, focusing on primary prevention for early communication and language difficulties, given their later impact on social and professional integration (Law 2013). Aims: In line with the recommendations of the Ministry of Public Health in Lebanon (Mental Health program services MHPSS, preventive and curative, Ministry of Public Health, 2015), the purpose of the project is to support language skills in preschoolers by adapting, implementing and analyzing co-intervention program that partners early childhood educators along with SLTs. Methods: First, we will identify the beliefs, representations and expectations of the different stakeholders (teachers, speech-language pathologists, school principals) through questionnaires and interviews among the diverse Lebanese school contexts in order to 1) identify the knowledge and 2) gather their expectations in the area of support and prevention for language difficulties in kindergarten. Second, the project aims to identify the quality of teacher-child interaction, considered as one of the primary mechanism that foster the development of child’s language competences. It is commonly assessed by using the Classroom Assessment Scoring System (CLASS-K; Pianta, La Paro, & Hamre, 2008). Ten dimensions will be considered: climate (positive or negative), teacher sensitivity, children's perspectives, behavior management, productivity, teaching practices and learning formats, concept Development, quality of feedback provided to the child, and linguistic modeling. Finally, we will design a co-intervention program that is the most consistent with the contextual, cultural and linguistic diversity in Lebanon. Two intervention settings will be addressed and compared: 1) a co-intervention with an SLT including direct coaching, and video-retroactions and 2) an implementation of the program led by the teacher after a training provided by an SLT. We will collect information about children’s bilingual environment through the Parental Bilingual Questionnaire (PABIQ-LITMUS, COST Action IS804), and we will evaluate interactions through CLASS-K (Pianta, La Paro, & Hamre, 2008), pre and post evaluation. Children's language skills will be measured through: ELO-L (Zebib, Khomsi, Henry, Messarra, & Kouba Hreich, Lebanon Tests Editions, 2017). Moreover, measurements of the fidelity of program’s implementation (dosage, adhesion, quality of the interactions, responsiveness) will also be carried out. Results: The expected results are intended to demonstrate to which extent an intervention program, to enhance communication and language skills, carried out jointly by teachers and speech therapists, would be more effective than a program delivered without the intervention of SLTs. The intervention of speech-language pathologists would thus have a more effective impact on the teachers' practices and the language skills of the children. This would justify the primary role of SLTs in indirect interventions in preschools in Lebanon. [less ▲]

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See detailL’ethnopharmacologie, à l’origine de nombreux médicaments
Frederich, Michel ULiege

Conference (2017, November 10)

L’ethnopharmacologie peut être définie comme « l’étude scientifique interdisciplinaire des matières d’origine végétale, animale ou minérale, et des savoirs et pratiques s’y rattachant, que les sociétés ... [more ▼]

L’ethnopharmacologie peut être définie comme « l’étude scientifique interdisciplinaire des matières d’origine végétale, animale ou minérale, et des savoirs et pratiques s’y rattachant, que les sociétés mettent en œuvre à des fins thérapeutiques, curatives, préventives ou diagnostiques ». De nombreux médicaments indispensables aujourd’hui sont issus de ces connaissances traditionnelles : on peut citer par exemple l’universelle Aspirine®, provenant du saule, ou la quinine, médicament du paludisme, issu du quinquina Sud-Américain. Aujourd’hui encore, selon l’OMS, 80% de la population mondiale a recourt, en première intention, aux plantes médicinales pour se soigner. Néanmoins, ces connaissances traditionnelles sont aujourd’hui menacées, que ce soit pour des raisons d’appauvrissement de la biodiversité, ou de déstructuration des sociétés et des connaissances traditionnelles. 1. Fleurentin, J. Traditions thérapeutiques et médecine de demain. 2011. Editions Ouest-France. [less ▲]

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See detailLe corps, le territoire et le temps du sujet borderline
Englebert, Jérôme ULiege

Conference (2017, November 09)

Detailed reference viewed: 70 (2 ULiège)
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See detail“Who Cares for those who Cared? Global Social Protection Arrangements Between Europe and Latin America”.
Vivas Romero, Maria ULiege

Conference (2017, November 09)

Belgium recently experienced an economic and political crisis. This context has reinforced the historical restrictive migratory approach while promoting policies that aim at restraining migration through ... [more ▼]

Belgium recently experienced an economic and political crisis. This context has reinforced the historical restrictive migratory approach while promoting policies that aim at restraining migration through the control of social provisions. In such an environment migrant families are categorized as an intolerable burden for the state (Lafleur and Stanek forthcoming). Evidently, these measures affected migrant family’s access to health-care, education, pension schemes and increased their unemployment rates (Castanheira et al. 2014; Pignal 2012). Nevertheless, it also drove them to diversify their resources to access social protection while negotiating them in sending, receiving and in-between countries. This paper tackles this last argument and explores the post-crisis strategies Peruvian and Colombian migrant families use to access global social protection arrangements while negotiating their access to informal and formal resources in a variety of countries in Europe and Latin America. Nonetheless, it also depicts emerging or transforming inequalities in their strategies. Global Social Protection arrangements are defined as strategies that migrants learn to put together through their life course to cope with social risks in areas such as: health-, long-term care, pensions or unemployment. Such strategies combine rights based in public welfare policies as well as market-family and community based practices. An intersectional lens (Anthias 2001) is used to explore how Andean transnational families’ ethnic, class, gender, generational positioning’s affects their strategies. The empirical data use draws from a multi-sited ethnography conducted with 15 Andean Transnational family networks over the past two years. [less ▲]

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See detailRédiger en langue étrangère à l’université : des représentations à l’évaluation des pratiques scripturales
Meunier, Deborah ULiege

Conference (2017, November 09)

Le champ des littéracies universitaires (Blaser et Pollet, 2010 ; Delcambre et Lahanier-Reuter, 2010) prend pour objet d’étude les normes génériques, textuelles, pragmatiques des écrits produits à ... [more ▼]

Le champ des littéracies universitaires (Blaser et Pollet, 2010 ; Delcambre et Lahanier-Reuter, 2010) prend pour objet d’étude les normes génériques, textuelles, pragmatiques des écrits produits à l’université, mais aussi celle des représentations associées aux pratiques de lecture et d’écriture. Au-delà de la maitrise du code linguistique d’enseignement, les étudiants doivent acquérir des compétences discursives liées aux genres écrits et oraux auxquels ils sont confrontés durant leur cursus (cours magistral, séminaire, exposé, résumé, compte-rendu, rapport, travail de fin d’études,…). Nous verrons quels sont les défis que pose la maitrise des genres de discours universitaires écrits en français pour les étudiants non francophones : comment se fait l’acculturation à une écriture heuristique pour un étudiant qui apprend dans une langue étrangère ? Quelles sont les représentations (explicites ou implicites) des normes génériques activées par les enseignants (par ex. via les consignes) ? Et quelle(s) posture(s) adopter lorsqu’on doit évaluer des productions écrites en langue étrangère quand la langue (française) n’est pas objet d’enseignement ? A partir d’une analyse de discours d’enseignants en Sciences humaines, nous ferons le point sur les représentations et les normes qui régissent les pratiques et les défis actuels du français sur objectifs universitaires, en particulier lorsqu’on est face à des profils d’apprenants plurilingues et mobiles. [less ▲]

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See detailFrom Gasoline Alley to Walt & Skeezix. Layers of Autobiography in Frank King's Comic Strip Reprints
Crucifix, Benoît ULiege

Conference (2017, November 09)

This paper focuses on Jeet Heer and Chris Ware’s D+Q reprints of Frank King’s original 1920s-1930s newspaper comic strip, suggesting that the paratext of these 21st-century editions provide an ... [more ▼]

This paper focuses on Jeet Heer and Chris Ware’s D+Q reprints of Frank King’s original 1920s-1930s newspaper comic strip, suggesting that the paratext of these 21st-century editions provide an “autobiographical reading” of the comic strip. Heer and Ware thus participate in the retrospective integration of Frank King’s comic strip within the autobiographical paradigm dominating the graphic novel. In doing so, the reprints acknowledge how King adapted to the cultural and commercial constraints of the newspaper strip to produce an indirect form of life-writing. [less ▲]

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See detailInjection of spin-polarized current in a Ge-based magnetic device with coplanar contacts
Fourneau, Emile ULiege; Avila Osses, Jonathan ULiege; Silhanek, Alejandro ULiege et al

Poster (2017, November 09)

Electron spin injection and spin detection in magnetic materials are key features to the functionalization of electron spin polarization as a degree of freedom for both information processing and storage ... [more ▼]

Electron spin injection and spin detection in magnetic materials are key features to the functionalization of electron spin polarization as a degree of freedom for both information processing and storage. Currently, spin-dependent tunneling in magnetic junction devices is the most common approach to achieve efficient spin injection. However, many recent studies highlighted the interesting possibility to create spin-polarized currents in structures which combine a magnetic semiconductor, e.g. magnetic alloys based on group-IV semiconductors or diluted magnetic semiconductor compounds, forming a Schottky-like rectifying junction with a metallic ferromagnet. Although theoretical works have already addressed the performance of this structure by numerical simulations of the spin drift and spin diffusion equations, taking into account various characteristics of the ferromagnet (FM) / semiconductor (SC) interface such as barrier height and boundary roughness in 1D models, correlations with experimental results are scarce. This work aims at achieving spin injection with Ge-based magnetic structures using a rectifying junction in a coplanar architecture. We performed 2D numerical calculations of the spin drift and diffusion process in the direct neighborhood of a junction consisting of a Mn5Ge3 half-metallic ferromagnet acting as the injecting contact and an n-type Ge film, forming 3- and 4-terminal devices. Our results show that geometrical effects play a major role on the spin injection efficiency. Moreover, the simulations emphasize the asymmetry of spin accumulation at the FM/SC interface as well as a strong effect of the depletion layer caused by the Schottky contact junction. [less ▲]

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See detailQuantitative profiling of endogenous polar metabolites from low volumes of blood samples
Kok, Miranda ULiege; Fillet, Marianne ULiege

Conference (2017, November 08)

The etiology of many diseases is not yet completely understood. The involved biological processes might be resolved using a metabolomics approach, because metabolomics provides unique challenging ... [more ▼]

The etiology of many diseases is not yet completely understood. The involved biological processes might be resolved using a metabolomics approach, because metabolomics provides unique challenging opportunities to correlate the metabolome with a physiological or pathophysiological status and provides a vision on the relationships between genes, gene expression, environment and lifestyle. Here, we present the development of two ultra-high performance liquid chromatography (UHPLC) methods coupled to mass spectrometry (MS) for the separation and quantitation of polar metabolites in blood samples. A reversed-phase UHPLC-MS/MS method has been developed to quantify anionic energetic metabolites, whereas hydrophilic interaction chromatography (HILIC)-MS/MS has been used to determine amino acids. Two sample pretreatment procedures have been developed for an optimal recovery of the respective metabolites from whole blood samples. One method involved the precipitation of proteins with organic solvents and acids. In addition, volumetric absorptive microsampling has been used for the sample preparation. Small and accurate quantities of biological fluids (10 or 20 µL) can be collected with this sampling technique, which is of great interest for volume-limited samples or serial collection of samples. The developed methods have been validated and will be applied to determine differences in metabolite concentrations between blood samples from patients and controls. This can lead to a breakthrough in the understanding of diseases and can open new therapeutic perspectives. [less ▲]

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See detailModulation of NMDA receptor mediated excitatory synaptic currents in dopamine neurons of the substantia nigra.
Destreel, Geoffrey ULiege; Seutin, Vincent ULiege; Engel, Dominique ULiege

Poster (2017, November 08)

Dopamine (DA) neurons of the substantia nigra pars compacta (SNc) exhibit two main firing modes, spontaneous single action potential (AP) firing and bursting. The amount of DA released by these neurons in ... [more ▼]

Dopamine (DA) neurons of the substantia nigra pars compacta (SNc) exhibit two main firing modes, spontaneous single action potential (AP) firing and bursting. The amount of DA released by these neurons in target areas depends on the presynaptic AP firing pattern and is essential to modulate several aspects of behavior such as the control of movement. Bursting activity is mediated by excitatory afferents and specifically by the activation of NMDA receptors (NMDARs). However, the level of activation of NMDARs at these synapses during spontaneous synaptic activity is unknown. We assessed the occupancy of the glycine binding sites of the NMDAR by testing the effects of coagonists and by blocking the uptake of glycine on spontaneous excitatory postsynaptic currents (sEPSCs) in DA neurons of the SNc. [less ▲]

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See detailPictorial scale of perceived water competences The building of a new tool adapted to the children
Jidovtseff, Boris ULiege; De Sousa Morgado, Liliane ULiege; Sääkslahti, Arja et al

Conference (2017, November 07)

Introduction Researches have demonstrated the interest to develop pictorial instrument for assessing fundamental movement skill perceived competence in young children (1). Perceived competence appears ... [more ▼]

Introduction Researches have demonstrated the interest to develop pictorial instrument for assessing fundamental movement skill perceived competence in young children (1). Perceived competence appears appear at least as important as actual competence as it may more directly affect motivation towards an active behavior (2). For different reasons, it is worth developing such a pictorial instrument for assessing children’s perceived water competencies. With that aim, a collective of researchers have decided to work on the development of such a new tool. Methods The collective of researcher started in 2016 during AIESEP congress in Laramie (USA) and grew up by including additional experts specialized in aquatic skill and/or pictorial scale tools. Videos skype conference and email exchanges were used for communication. Important discussions and decisions concerned the list of aquatic competence skills, the scoring system, the selection of an illustrator and the characteristics of the pictures. In order to build the tool within a reasonable delay, timing with the different actions has been suggested. Results A first list of water competencies has been dressed based on scientific references (3-5). According to these skills, different practical situation have been selected to be included in the pictorial scale. The collective of researcher decided to start with a three level score system including ‘not able’, ‘in progression’ and ‘able’ pictures for each situation. All pictures must be digital in such a way they could be used on paper and/or on computer and android/apple applications. Pictures have to be neutral and to be representative of different cultures and contexts in order to be adapted to all countries and situations. The possibility of having the same image in different cultural contexts is investigated. The different steps in the scale development have been scheduled and will include: content validity, face validity, construct validity, reliability, data collection. Conclusion The development of a pictorial instrument for assessing children perceived water competencies is progressing well and a usable version of the tool should be available by the end of 2017 References 1. Barnett, L. M., Ridgers, N. D., Zask, A., & Salmon, J. (2015). Face validity and reliability of a pictorial instrument for assessing fundamental movement skill perceived competence in young children. Journal of science and medicine in sport, 18(1), 98-102. 2. Barnett, L. M., Morgan, P. J., van Beurden, E., & Beard, J. R. (2008). Perceived sports competence mediates the relationship between childhood motor skill proficiency and adolescent physical activity and fitness: a longitudinal assessment. International journal of behavioral nutrition and physical activity, 5(1), 40. 3. Langendorfer, S. J., & Bruya, L. D. (1995). Aquatic readiness: Developing water competence in young children. Human Kinetics 1. 4. Langendorfer (2015). Changing Learn-to-Swim and Drowning Prevention Using Aquatic Readiness and Water Competence, International Journal of Aquatic Research and Education, 2015, 9, 4-11 5. Quan et al. (2015). Toward Defining Water Competency: An American Red Cross Definition, International Journal of Aquatic Research and Education, 2015, 9, 12-23 [less ▲]

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See detailGeneration of open foam RVEs with sharp edges using Distance fields and Level sets
Kilingar, Nanda Gopala ULiege; Noels, Ludovic ULiege; Massart, Thierry Jacques et al

Conference (2017, November 07)

A methodology to generate Representative Volume Elements for open foam cellular materials based on distance and level set functions is explained. The main focus of this work is to properly represent the ... [more ▼]

A methodology to generate Representative Volume Elements for open foam cellular materials based on distance and level set functions is explained. The main focus of this work is to properly represent the geometry of the sharp edges of the foam struts that are resulting from the solidification phase during manufacturing. An approach to generate RVEs for open-cell foams is described in [1], where arbitrary shaped tessellations are produced and specific combination of distance functions are used to generate open foam RVEs. Steep discontinuities in the distance functions derivatives result in the generation of jagged sharp edges, due to the use of discrete level set functions. The procedure to extract geometries from multiple level set functions to reproduce such sharp edges of the struts proposed in [1] has been incorporated in the current work. The individual cells are extracted as inclusion surfaces based on distance functions. The inclusion surfaces are then modified using multiple level set functions, and the sharp edges are computed from the intersection of these inclusions. The resulting geometry can then be meshed using size functions based on curvature and narrowness and a mesh optimization inspired from [2]. The methodology to produce high quality meshes based on [3] will be outlined (Figure 2). The resulting FE models will be then used in simulations to assess the practical applications of these models by comparing with experimental data of physical samples. [less ▲]

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See detailCharacterization and regulation of the intestinal epithelial cell response to colitogenic triggers
El Abbas, Sophie ULiege; Beguin, C; Schyns, Joey ULiege et al

in Proceedings of Annual meeting of the French Society for Immunology (SFI) (2017, November 07)

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See detailGeneration of unidirectional composite stochastic volume elements from micro-structural statistical information
Wu, Ling ULiege; Bidaine, Benoit; Major, Zoltan et al

Conference (2017, November 07)

The purpose of this work is to generate Stochastic Volume Element (SVE) of unidirectional composites using statistical information obtained from imaging technique in order to study the effect of the micro ... [more ▼]

The purpose of this work is to generate Stochastic Volume Element (SVE) of unidirectional composites using statistical information obtained from imaging technique in order to study the effect of the micro-structure uncertainty on the meso-scale behavior. When considering a homogenization-based multiscale approach, the material properties are obtained at each integration point of a macro-structure from the resolution of a micro-scale boundary value problem. When the separation of scales holds, the macro-point is viewed at the micro-level as the center of a Representative Volume Element (RVE). However, for composite materials which suffer from a large scatter in their constituent properties and microstructure, the separation of scales does not always hold, in particular at the onset of failure, and structural properties exhibit a scatter. In order to predict this scatter, Stochastic Volume Elements (SVE) [1, 2] of unidirectional fiber composite materials should be built from experimental measurements, see Fig. 1(a). Toward this end, statistical functions of the fibers features such as radius, the closest neighboring distance etc. [3] are extracted from several SEM images to generate statistical functions of the micro-structure. The dependent variables are then represented using the copula framework, allowing generating micro-structures, see Fig. 1(b), using an inclusions additive process. Simulations on the generated SVEs are then used to extract the probabilistic meso-scale stochastic behavior. In the future the extracted behaviors will be used to build a stochastic model of homogenized properties based on Mean-Field-Homogenization in order to predict statistical macro-scale behaviors and in particular the failure onset. References [1] Ostoja-Starzewski, M., Wang, X. Stochastic finite elements as a bridge between random material microstructure and global response. Comput. Meth. in Appl. Mech. and Eng. (1999) 168: 35-49. [2] Lucas, V., Golinval, J.-C., Paquay, S., Nguyen, V.-D., Noels, L., Wu, L. A stochastic computational multiscale approach; Application to MEMS resonators. Comput. Meth. in Appl. Mech. and Eng. (2015) 294, 141-167. [3] Vaughan, T.J., McCarthy C.T. A combined experimentalnumerical approach for generating statistically equivalent fibre distributions for high strength laminated composite materials. Compos. Sci. and Tech. (2010) 70, 291-297. [less ▲]

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See detailEcophysiology of elephants to better understand their crop selection: first results of a case study in Monts de Cristal, Gabon
Ngama, Steeve ULiege

Conference (2017, November 07)

Parasites and hormones are one of the best indicators of animal ecophysiology which clarify the role and importance of physiological processes in the ecological relations of species in their natural ... [more ▼]

Parasites and hormones are one of the best indicators of animal ecophysiology which clarify the role and importance of physiological processes in the ecological relations of species in their natural habitat. As damages on crops are often sources of conflict between humans and elephants in elephant home ranges, few data on the relevance of elephant physiology on crop selection exist. For that we investigate elephant ecophysiology to better understand if their parasitism and stress conditions underlie their crops selection. For that we measured parasite loads and stress hormone levels in feces of some elephants eating banana and others eating natural food. We conducted the study during fifteen months covering five different local seasons of the research site in Mont de Cristal, Gabon. Here we report first results from two seasons. We collected 485 samples of elephant dungs and more than 1200 samples of food items eaten by elephants. While stress levels are not correlated to banana selection, the presence of parasites is. Our results show higher parasite loads in dungs of elephants eating banana than in those of elephants eating natural food resources species. Thus elephants may eat banana more as a medicine item than a food resource. But we still need to confirm these results by assessing this trend over seasons and with reproduction hormones. [less ▲]

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See detailDevelopment of an Interferometric Mass Processing Chain for Multitemporal Ground Deformation Measurements
Libert, Ludivine ULiege; De Rauw, Dominique ULiege; d'Oreye, Nicolas

Conference (2017, November 07)

The main goal of the RESIST project is to understand the mechanisms driving volcanic eruptions and landslides in the Kivu region, on the East African Rift. In order to model both volcanic and landslide ... [more ▼]

The main goal of the RESIST project is to understand the mechanisms driving volcanic eruptions and landslides in the Kivu region, on the East African Rift. In order to model both volcanic and landslide processes, it is necessary to measure ground deformations in the region accurately. For this purpose, both ground-based instruments (e.g. GPS network) and spaceborne data (e.g. optical and SAR images) are used. One aspect of the project focuses on Differential SAR Interferometry (DInSAR), which is a technique used to map ground deformations occurring between two SAR images acquired at different times. It is today a well-mastered technique that offers large spatial coverage with a typical temporal sampling of one to several days, depending on the chosen sensor. In the last years, multitemporal approaches based on DInSAR have been developed, like the Small BAseline Subset (SBAS) [1] and Multidimensional Small BAseline Subset (MSBAS) [2] techniques, or the Persistent Scatterers Interferometry (PSI) [3]. In the framework of RESIST, we use MSBAS to perform ground deformations monitoring along time. The Multidimensional Small BAseline Subset (MSBAS) technique produces 2-D time series of ground deformations by integrating data sets of SAR images acquired by different sensors, with different spatial and temporal sampling, resolutions, incidence angles, wavelengths, pass directions and other varying parameters. By combining at least two data sets with overlapping spatial and temporal coverage and an extended range of look angles, the evolution of deformations in the vertical and west-east directions can be computed by the MSBAS approach [2]. The MSBAS software feeds on a large amount of deformation maps, which are produce by DInSAR. Such an amount of data cannot be produced by hand and that is the reason why we developed an automatic interferometric processing chain meant to produce large amounts of products adequate for multitemporal methods like MSBAS. The interferometric processing is supported by the CSL InSAR Suite (CIS) software developed at Centre Spatial de Liège, which presents the advantages to be fully adaptable to the needs of the MSBAS technique and the thematic specificities. Indeed, numerous options (e.g. adaptive filtering, wide swath interferometry) have been added to the CIS software in the framework of the RESIST project. In a first time, we will briefly present the MSBAS approach and its advantages regarding the ground deformation measurements. In the second part of the presentation, we will introduce the mass processing chain step by step and its functionalities. Critical steps of the chain, like the chosen strategy for the interferometric pairs selection, the integration of Sentinel-1 data or the image interpolation approach, will be presented in more details. Finally, preliminary results of an MSBAS processing over the Bukavu area will be presented. REFERENCES: [1] Berardino, P., Fornaro, G., Lanari, R., and Sansosti, E. (2002). A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms, IEEE Trans. Geosci. Remote Sens., 40, 11, pp. 2375-2383. doi: 10.1109/TGRS.2002.803792. [2] Samsonov, S., and d’Oreye, N. (2012). Multidimensional time series analysis of ground deformation from multiple InSAR data sets applied to Virunga Volcanic Province, Geophysical Journal International, 191, 3, pp. 1095-1108. doi: 10.1111/j.1365-246X.2012.05669.x [3] Ferretti, A., Prati, C., and Rocca, F. (2001). Permanent scatterers in SAR interferometry, IEEE Trans. Geosci. Remote Sens., 39, 1, pp. 8-20. doi: 10.1109/36.898661. [less ▲]

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See detailA stochastic 3-scale method to predict the thermo-elastic behaviors of polycrystalline structures
Wu, Ling ULiege; Lucas, Vincent; Golinval, Jean-Claude ULiege et al

Conference (2017, November 07)

The purpose of this work is to upscale material uncertainties in the context of thermo-elastic response of polycrystalline structures. The probabilistic behavior of micro-resonators made of ... [more ▼]

The purpose of this work is to upscale material uncertainties in the context of thermo-elastic response of polycrystalline structures. The probabilistic behavior of micro-resonators made of polycrystalline materials is evaluated using a stochastic multi-scale approach defined using the following methodology. 1. Stochastic volume elements (SVEs) [1] are defined from Voronoi tessellations using experimental measurements of the grain size, orientation, and surface roughness [2]; 2. Mesoscopic apparent thermo-elastic properties such as elasticity tensor, thermal conductivity tensor, and thermal dilatation tensor are extracted using a coupled homogenization theory [3, 4] applied on the SVE realizations; 3. A stochastic model of the homogenized properties extracted from Voronoi tessellations using a moving window technique is then constructed in order to be able to generate spatially correlated meso-scale random fields; 4. These meso-scale random fields are then used as input for stochastic finite element simulations. As a result, the probabilistic distribution of micro-resonator properties can be extracted. The applications are two-fold: 1. A stochastic thermo-elastic homogenization, see Fig. 1(a), is coupled to thermoelastic 3D models of the micro-resonator in order to extract the probabilistic distribution of the quality factor of micro-resonators [5]; 2. A stochastic second-order mechanical homogenization, see Fig. 1(b), is coupled to a plate model of the micro-resonator in order to extract the effect of the uncertainties related to the surface roughness of the polycrystalline structures [2]. References [1] Ostoja-Starzewski, M., Wang, X. Stochastic finite elements as a bridge between random material microstructure and global response. Comput. Meth. in Appl. Mech. and Eng. (1999) 168: 35-49. [2] Lucas, V., Golinval, J.-C., Voicu, R., Danila, M., Gravila, R., Muller, R., Dinescu, A., Noels, L., Wu, L. Propagation of material and surface profile uncertainties on MEMS micro-resonators using a stochastic second-order computational multi-scale approach. Int. J. for Num. Meth. in Eng. (2017). [3] Temizer, I., Wriggers, P. Homogenization in finite thermoelasticity.J. of the Mech. and Phys. of Sol. (2011) 59, 344-372. [4] Nguyen, V. D., Wu, L., Noels, L. Unified treatment of boundary conditions and efficient algorithms for estimating tangent operators of the homogenized behavior in the computational homogenization method. Computat. Mech. (2017) 59, 483-505. [5] Wu, L., Lucas, V., Nguyen, V. D., Golinval, J.-C., Paquay, S., Noels, L. A Stochastic Multi-Scale Approach for the Modeling of Thermo-Elastic Damping in Micro-Resonators. Comput. Meth. in Appl. Mech. and Eng. (2016) 310, 802-839. [less ▲]

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See detailFonction publique et ressources humaines. Communes de la Province de Luxembourg
Grandjean, Geoffrey ULiege

Conference (2017, November 06)

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See detailCoding of papers submitted to the 14th Congresso Brasileiro de Medicina de Família e Comunidade
Augusto, Daniel; Rebolho, Ricardo; Jamoulle, Marc ULiege et al

Conference (2017, November 05)

Introduction: The intention of codifying the 14th CBMFC's work with the use of 3CGP (Core Concept Classification in General Practice Family Medicine) appeared during the 21st WONCA World Conference of ... [more ▼]

Introduction: The intention of codifying the 14th CBMFC's work with the use of 3CGP (Core Concept Classification in General Practice Family Medicine) appeared during the 21st WONCA World Conference of Family Physicians, when members of the organizing committee of the 14th CBMFC were able to participate in an activity given by Dr Marc Jamoulle on the subject and realized how important it could be to use 3CGP. It consists of using the International Classification of Primary Care (CIAP-2) and the Q-Codes to classify the contents of abstracts submitted to the congress. CBMFCs are large events, which usually receive a substantial number of abstracts. The experience of using 3CGP in an event of this magnitude can have a great impact for the development of the specialty in the country, besides having a pioneering character, contributing for 3CGP to become an international standard in the congresses of family and community medicine. Objectives: Assist the author in the choice of theme; Teaching how to index; Contribute to updating the Q Codes; Manage the congress; Contribute in the management of knowledge in family and community medicine. Method: This is an action research experiment that will consist of the coding of all abstracts submitted to the 14th CBMFC with the use of 3CGP. Authors will be introduced to the classification system by means of an introductory text and should submit their work on the event site using a system that already allows them to perform the encoding of the abstract. The data obtained in this process will be evaluated by members of the organizing committee of the 14th CBMFC, who will be in charge of synthesizing it. [less ▲]

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See detailOstéochondrites
Kaux, Jean-François ULiege; Maillard, Bérengère

Conference (2017, November 04)

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See detailRaman Chemical Imaging in Kidney Stone Analysis
Castiglione, Vincent ULiege; Sacre, Pierre-Yves ULiege; CAVALIER, Etienne ULiege et al

Poster (2017, November 02)

Background: The structure of kidney stones might provide clinical useful information in addition to the stone composition. The Raman chemical imaging (RCI) is a new technology used for the production of ... [more ▼]

Background: The structure of kidney stones might provide clinical useful information in addition to the stone composition. The Raman chemical imaging (RCI) is a new technology used for the production of two-dimensions maps of the constituents' distribution in samples. We aimed at determining the use of RCI in urinary stone analysis. Methods: Twelve calculi were analyzed by RCI using a confocal Raman microspectrophotometer. They were selected according to their heterogeneous composition and morphology. Prior to the analysis, samples were sliced and milled in order to detect the nucleus of the stones and having a smooth surface. RCI was performed on the whole section of stones. Once acquired, the data were baseline corrected and analyzed by MCR-ALS. Results were then compared to the spectra obtained by Fourier Transform Infrared spectroscopy, the gold standard method for the determination of urolithiasis composition. Results: RCI succeeded in identifying all the chemical components contained in each sample, including monohydrate and dihydrate calcium oxalate, anhydrous and dihydrate uric acid, apatite, struvite, brushite, whitlockite and ammonium urate. However, proteins couldn't be detected because of the huge autofluorescence background and the small concentration of these poor Raman scatterers. Carbapatite and calcium oxalate were correctly detected even when they represented less than 5 percent of the whole stones, allowing the detection of very small structures like Randall's plaques. Moreover, RCI provided the distribution of components within the stones. The nuclei were accurately identified, as well as thin layers of other components. Conversion of dihydrate to monohydrate calcium oxalate was correctly observed in the center of one sample. Conclusion: RCI showed a good accuracy in comparison with infrared spectroscopy in identifying components of kidney stones. In addition, RCI is nondestructive enabling the storage of samples. This analysis was also useful in determining the organization of components within stones, which help locating constituents in low quantity, such as nuclei. However, this analysis is time-consuming, which makes it more suitable for research studies rather than routine analysis. [less ▲]

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See detailComparison of faecal microbiota of horses suffering from atypical myopathy and healthy co-grazers
Cerri, Simona ULiege; Taminiau, Bernard ULiege; Votion, Dominique ULiege et al

Poster (2017, November 02)

Objectives: To characterize faecal microbiota of horses with atypical myopathy (AM) compared with healthy co-grazers (HcG). Methods: Fresh faecal samples were obtained from 6 horses (1 stallion, 3 ... [more ▼]

Objectives: To characterize faecal microbiota of horses with atypical myopathy (AM) compared with healthy co-grazers (HcG). Methods: Fresh faecal samples were obtained from 6 horses (1 stallion, 3 geldings and 2 females; mean age of 11.810 years) with confirmed AM and 6 HcG (4 geldings and 2 females; mean age of 13.68 years) during autumn-2016 and spring-2017 AM outbreaks in Belgium. Bacterial taxonomy profiling obtained by 16S amplicon sequencing of faeces was used to identify differentially distributed bacterial taxa between AM and HcG. Results were statistically compared using Welch's t-test with STAMP software. Results: A total of 90,407 sequences were analysed and clustered to 8,066 operational taxonomic units. Bacterial populations were distributed between 17 phylas, although 20% of sequences could not be attributed to an existing phylum. Horses with AM harboured a significantly higher relative abundance of Ruminococcaeae family with a significantly lower Lachnospiraceae when compared to HcG. Discussion: AM is caused by hypoglycin A intoxication, but only a part of horses pasturing in the same toxic environment develops the pathology, suggesting that there may be protective factors at the horse level. The results of this study show significant differences in faecal microbiota between AM cases and HcG, which could suggest that microbiota could play a role in the development or prevention of clinical disease. Conclusions: Results demonstrate that microbiota of AM affected horses is significantly different compared to HcG. Significance: Microbiome could influence the development of AM, but this role deserves further investigation. [less ▲]

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See detailInvestigating the Magnetospheres of Rapidly Rotating B-type Stars
Fletcher, C. L.; Petit, V.; Nazé, Yaël ULiege et al

in The Lives and Death-Throes of Massive Stars (2017, November 01)

Recent spectropolarimetric surveys of bright, hot stars have found that ~10% of OB-type stars contain strong (mostly dipolar) surface magnetic fields (~kG). The prominent paradigm describing the ... [more ▼]

Recent spectropolarimetric surveys of bright, hot stars have found that ~10% of OB-type stars contain strong (mostly dipolar) surface magnetic fields (~kG). The prominent paradigm describing the interaction between the stellar winds and the surface magnetic field is the magnetically confined wind shock (MCWS) model. In this model, the stellar wind plasma is forced to move along the closed field loops of the magnetic field, colliding at the magnetic equator, and creating a shock. As the shocked material cools radiatively it will emit X-rays. Therefore, X-ray spectroscopy is a key tool in detecting and characterizing the hot wind material confined by the magnetic fields of these stars. Some B-type stars are found to have very short rotational periods. The effects of the rapid rotation on the X-ray production within the magnetosphere have yet to be explored in detail. The added centrifugal force due to rapid rotation is predicted to cause faster wind outflows along the field lines, leading to higher shock temperatures and harder X-rays. However, this is not observed in all rapidly rotating magnetic B-type stars. In order to address this from a theoretical point of view, we use the X-ray Analytical Dynamical Magnetosphere (XADM) model, originally developed for slow rotators, with an implementation of new rapid rotational physics. Using X-ray spectroscopy from ESA's XMM-Newton space telescope, we observed 5 rapidly rotating B-types stars to add to the previous list of observations. Comparing the observed X-ray luminosity and hardness ratio to that predicted by the XADM allows us to determine the role the added centrifugal force plays in the magnetospheric X-ray emission of these stars. [less ▲]

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See detailThe supergiant O + O binary system HD 166734: a new study
Gosset, Eric ULiege; Mahy, Laurent ULiege; Damerdji, Yassine ULiege et al

in The Lives and Death-Throes of Massive Stars (2017, November 01)

We present here a modern study of the radial velocity curve and of the photometric light curve of the very interesting supergiant O7.5If + O9I(f) binary system HD 166734. The physical parameters of the ... [more ▼]

We present here a modern study of the radial velocity curve and of the photometric light curve of the very interesting supergiant O7.5If + O9I(f) binary system HD 166734. The physical parameters of the stars and the orbital parameters are carefully determined. We also perform the analysis of the observed X-ray light curve of this colliding-wind binary. [less ▲]

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See detailUp and downs of a magnetic oblique rotator viewed at high resolution
Nazé, Yaël ULiege; Zhekov, S. A.; Ud-Doula, A.

in The Lives and Death-Throes of Massive Stars (2017, November 01)

In 2006, the Of?p star HD191612 became the second O-star where a magnetic field was discovered. It provided a benchmark to understand the Of?p phenomenon as a whole. Ten years later, an X-ray monitoring ... [more ▼]

In 2006, the Of?p star HD191612 became the second O-star where a magnetic field was discovered. It provided a benchmark to understand the Of?p phenomenon as a whole. Ten years later, an X-ray monitoring performed at high-resolution reveals the behaviour of the hottest magnetospheric plasma: it is located at ~ 2R [SUB]⊙[/SUB], hot but not extreme (log(T) ~ 7), producing unshifted lines, and displaying a very repetitive variability. A direct comparison with simulations yields an overall good agreement, with only a few further improvements needed. [less ▲]

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See detailX-rays from colliding winds in massive binaries
Nazé, Yaël ULiege; Rauw, Grégor ULiege

in The Lives and Death-Throes of Massive Stars (2017, November 01)

In a massive binary, the strong shock between the stellar winds may lead to the generation of bright X-ray emission. While this phenomenon was detected decades ago, the detailed study of this emission was ... [more ▼]

In a massive binary, the strong shock between the stellar winds may lead to the generation of bright X-ray emission. While this phenomenon was detected decades ago, the detailed study of this emission was only made possible by the current generation of X-ray observatories. Through dedicated monitoring and observations at high resolution, unprecedented information was revealed, putting strong constraints on the amount and structure of stellar mass-loss. [less ▲]

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See detailEssay of Siganus sutor aquaculture in Madagascar: for promising alternative activity for traditional fishermen
Ravelohasina, Helga; Rasolofonirina, R.; Mahafina, J. et al

Poster (2017, November)

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See detailBIGMOMAL - Big Data Analytics for Mobile Malware Detection
Wassermann, Sarah ULiege; Casas, Pedro

Poster (2017, November)

Mobile malware is on the rise. Due to their popularity, smartphones represent an attractive target for cybercriminals, especially regarding unauthorized access to private user data; smartphones ... [more ▼]

Mobile malware is on the rise. Due to their popularity, smartphones represent an attractive target for cybercriminals, especially regarding unauthorized access to private user data; smartphones incorporate a lot of sensitive information about users, even more than a personal computer. Indeed, besides personal information such as documents, accounts, passwords, contacts, etc., smartphone sensors centralize other sensitive data such as user location, physical activities, etc. In this paper, we study the problem of malware detection in smartphones, using supervised machine learning models and big data analytics frameworks. Using a publicly available dataset for smartphone data analysis (the SherLock data collection, see http://bigdata.ise.bgu.ac.il/sherlock/), we train and benchmark different supervised machine learning models to detect malware apps activity.The Sherlock data collection is a crowdsourcing-based smartphone dataset in which hundreds of features from many different "sensors" or vantage points within the device are monitored, using a tailored smartphone agent. The collection is done during a long-term - 2 years (2015/16), field trial on 50 smartphones used as primary device for 50 different participants. The monitoring agent collects a wide variety of network, software and sensor data at a high sample rate (as low as 5 seconds); in addition, participant devices include a sandbox-like smartphone agent which runs controlled malware apps, perpetrating attacks on the user's device (such as contacts theft, spyware, phishing, etc.), while creating labels for the SherLock dataset. The complete labeled dataset contains more than 10 billion data records, with a total of about 4 TB of data. We additionally complement the labels for malicious apps which might have been installed by participants by analyzing the installed apps' hashes in Virus Total (https://www.virustotal.com), a well-known multi antivirus online scanning system. From the complete dataset, we keep two specific feature categories: all those features related to the network traffic generated by the apps, and all those features corresponding to the footprint of the app on the CPU and internal running processes (e.g., statistics on CPUs, memory usage, linux-level processes information, etc.). The rationale is that some malware activity would be more visible at the network traffic level, whereas some others would be better identified at the local processes level. Using this dataset, we train different machine learning models (e.g., decision trees, neural networks, SVMs, etc.) and verify their accuracy to automatically spot out malicious apps running on the users’ devices. We also apply feature selection strategies to improve results and reduce computational times. Given the size of the dataset, we rely on big data platforms (such as Spark) to perform the analysis, complementing the machine learning based analysis with scikit-learn like pipelines. We evaluate three different concepts, including (i) overall model performance (using multi-fold cross validation on the complete dataset), (ii) generalization of the learned models across different users (train in N-1 users, and test in the remaining user), and (iii) detection accuracy drift along time (train during first month/week, test the resulting model in the subsequent months/weeks). Initial results are very promising, especially regarding overall model performance for decision tree based models. [less ▲]

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See detailWhat does "Smart" mean in Rural Development?
Schmitz, Serge ULiege

Conference (2017, November)

For more than a decade, "smart development" is a leitmotiv in both the literature and political discourse. Besides the integration of ICT in everyday life, “smartness” seems to include many approaches ... [more ▼]

For more than a decade, "smart development" is a leitmotiv in both the literature and political discourse. Besides the integration of ICT in everyday life, “smartness” seems to include many approaches, which are sometimes in contradiction. Based on a systematic literature and internet review; this introduction scrutinizes the use of the fuzzy concept in rural development studies and questions the fate of geography in regard of this “marketing” development [less ▲]

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See detailPlant phenotyping activities at the Walloon Agricultural Research Centre
Vincke, Damien; Durenne, Bastien ULiege; Mingeot, Dominique et al

Poster (2017, November)

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See detailUsing phenotyping and complementary VOC profiling approach to investigate physiological response of Brassica napus L. plantlets under cadmium and epoxiconazole abiotic stresses
Durenne, Bastien ULiege; Geerts, Pascal; Druart, Philippe et al

Poster (2017, November)

Thanks to a laboratory, high-throughput and sterile homemade glass chambers system giving us the capacity to follow VOC (Volatile Organic Compounds) emissions at any time during plant growth, we are able ... [more ▼]

Thanks to a laboratory, high-throughput and sterile homemade glass chambers system giving us the capacity to follow VOC (Volatile Organic Compounds) emissions at any time during plant growth, we are able to compare the phenotype of the plant and its VOC emission in the same time. Although the system could be used for biotic stress too, we decided to investigate the physiological response of oilseed rape plantlets such as model plant concerning two atypical abiotic stresses: cadmium and epoxiconazole. Experiments were achieved under several concentrations corresponding to a gradient from a tolerant to a sublethal dose. Oilseed rape plantlets phenotyping consisted in daily symptoms observation (chlorosis for cadmium stress and shorter internodes length for expoxiconazole stress), shoots and roots length recording and finally, fresh and dry weight assessment. The main goal was therefore to analyse VOC profile with a non-destructive method in parallel to this phenotype characterization in absence of interferences with uncontrolled environmental conditions. Cadmium was chosen because it can be problematic within agricultural soils (phosphate fertilizers among other things) and epoxiconazole because it is a systemic fungicide used in cereals known to be hugely persistent into agricultural soils. [less ▲]

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See detailUltra-High Performance Liquid Chromatography coupled to tandem Mass Spectrometry for the detection of animal by-products in feed
Lecrenier, Marie-Caroline ULiege; Planque, Mélanie; Dieu, Marc et al

in Book of abstracts of the 8th International Symposium on Recent advances in food analysis (2017, November)

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See detailAnycast on the Move - A First Look at Mobile Anycast Performance
Wassermann, Sarah ULiege; Rula, John P.; Bustamante, Fabian

Poster (2017, November)

Service providers rely on replication to improve service performance and reliability, placing instances in multiple locations and redirecting clients to nearby copies. Anycast is a common mechanism used ... [more ▼]

Service providers rely on replication to improve service performance and reliability, placing instances in multiple locations and redirecting clients to nearby copies. Anycast is a common mechanism used for redirecting clients in a variety of domains from naming to CDNs and video streaming. IP anycast offers a method for making a service IP address available to a routing system from several locations at once, and clients' requests are directed based on BGP routing policies. For operators, IP anycast offers an economic, scalable, and simple approach to replicated services; BGP provides considerable robustness, adapting to changes in service and network availability. For clients, however, the mapping can be suboptimal, unstable, and seemingly chaotic, as routing policies have not only technical motivations, and routing changes can silently shift traffic from one site to another with a consequent loss of shared state and potential performance impact. Given its wide deployment and interesting tradeoffs, IP anycast has been the focus of much recent measurement work. All prior studies have, nevertheless, focused on wired networks despite the growing dominance of mobile Internet. Today, the number of mobile subscriptions is over 7.4 billion, and users spend over 2x times more hours browsing on their smartphones than on any other device, with the corresponding increase on cellular traffic. We present early results on the first study of anycast performance for mobile users. Our evaluation focuses on two distinct anycast services, K-and F-Root, each providing part the DNS Root zone. Both services are widely replicated with publicly available site locations and unicast IP addresses that allow us to evaluate the relative performance of anycast routing to its "optimal" (in terms of unicast) site location. We collected active measurements from geographically distributed clients on both cellular and WiFi networks from September 2016 until April 2017, using the Aqualab’s ALICE engine [1]. In each experiment clients launched ping and traceroute measurements towards the root servers’ anycast addresses, as well as to five chosen unicast addresses determined to be the closest to the client in terms of geographic distance, at an hourly rate. Clients also recorded their geographic location, anonymized to a 10 km² area. Our findings show that mobile clients are routed to suboptimal replicas in terms of geographical distance, more frequently while on a cellular connection than on WiFi, with a significant impact on perceived service performance. The phenomenon seems to be more pronounced for K-Root than for F-Root. A possible explanation for the long distances would be that our cellular clients are simply far away from all the available replicas. However, our investigations demonstrate that this is not necessarily the case. Finally, we start to explore the root causes for anycast anomalies in cellular networks. We reveal three classes of anomalies: distant client packet gateways, poor anycast routing within Tier-1 networks, and improper routing out of cellular networks. [1] http://aqualab.cs.northwestern.edu/projects/261-alice [less ▲]

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See detailLife Cycle Assessment of railway infrastructure in Belgium
Merchan Arribas, Angel ULiege; Belboom, Sandra ULiege; Léonard, Angélique ULiege

in [avniR] conference. Life Cycle Management, the pathway for ecotransition. 2017 Conference proceedings (2017, November)

In the framework of the BRAIN-TRAINS project, the environmental impact of rail freight transport in Belgium has been analysed using the Life Cycle Assessment (LCA) methodology. The rail freight transport ... [more ▼]

In the framework of the BRAIN-TRAINS project, the environmental impact of rail freight transport in Belgium has been analysed using the Life Cycle Assessment (LCA) methodology. The rail freight transport system has been divided in three sub-systems: rail transport operation, rail equipment (locomotives and wagons) and rail infrastructure. For the sub-system rail infrastructure, a detailed study of the life cycle phases of construction, maintenance and disposal of infrastructure has been conducted. We have collected specific information related to the Belgian railway infrastructure from both literature sources and directly from Infrabel (the Belgian railway infrastructure manager) through the use of questionnaires. The purpose of this paper is to give an overview of the methodology used to analyse the LCA of the railway infrastructure in Belgium as a part of the rail freight transport system. [less ▲]

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See detailENTOFÔR project -From waste to resource
Lecrenier, Marie-Caroline ULiege; Fumière, Olivier; Berntssen, M.H.G. et al

Poster (2017, November)

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See detailThrough the Wormhole: Tracking Invisible MPLS Tunnels
Vanaubel, Yves ULiege; Mérindol, Pascal; Pansiot, Jean-Jacques et al

in ACM Internet Measurement Conference (2017, November)

For years, Internet topology research has been conducted through active measurement. For instance, CAIDA builds router level topologies on top of IP level traces obtained with traceroute. The resulting ... [more ▼]

For years, Internet topology research has been conducted through active measurement. For instance, CAIDA builds router level topologies on top of IP level traces obtained with traceroute. The resulting graphs contain a significant amount of nodes with a very large degree, often exceeding the actual number of interfaces of a router. Although this property may result from inaccurate alias resolution, we believe that opaque MPLS clouds made of invisible tunnels are the main cause. Using Layer-2 technologies such as MPLS, routers can be configured to hide internal IP hops from traceroute. Consequently, an entry point of an MPLS network appears as the neighbor of all exit points and the whole Layer-3 network turns into a dense mesh of high degree nodes. This paper tackles three problems: the revelation of IP hops hidden by MPLS tunnels, the MPLS deployment underestimation, and the overestimation of high degree nodes. We develop new measurement techniques able to reveal the presence and content of invisible MPLS tunnels. We assess them through emulation and cross-validation and perform a large-scale measurement campaign targeting suspicious networks on which we apply statistical analysis. Finally, based on our dataset, we look at basic graph properties impacted by invisible tunnels. [less ▲]

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See detailCoalescence in Highly Viscous System
Leleu, David ULiege; Pfennig, Andreas ULiege; Bruns, Nicole

Poster (2017, November)

study of the coalescence in liquid-liquid dispersion by comparing batch settling cell experiment with a numerical tool, based on ReDrop concept.

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See detailIs oral feeding compatible with an unresponsive wakefulness syndrome?
MELOTTE, Evelyne ULiege

Poster (2017, November)

Introduction : Vegetative state/unresponsive wakefulness syndrome (VS/UWS) is defined by the presence of eye-opening and the absence of awareness and voluntary movement [1]. VS/UWS patients classically ... [more ▼]

Introduction : Vegetative state/unresponsive wakefulness syndrome (VS/UWS) is defined by the presence of eye-opening and the absence of awareness and voluntary movement [1]. VS/UWS patients classically receive hydration and nutrition through an enteral feeding tube. Objective - Methods : We retrospectively reviewed the clinical information of 65 VS/UWS patients (aged 45±12; range 16-85 years) evaluated at the CHU hospital of liege searching for mention of oral feeding. VS/UWS diagnosis was made after repeated behavioral assessments using the standardized coma recovery scale–revised (CRS-R, [2]) in association with complementary evaluations using neuroimaging techniques. Results : Of the 65 VS/UWS patients, two could resume oral feeding (3%). One could achieve full oral feeding and the other had oral feeding in addition to gastrostomy feeding. Neuroimaging evaluations showed in both patients a massive decrease in the spontaneous brain activity and its functional connectivity (using functional magnetic resonance imaging), bilateral cerebral cortex hypometabolism and preserved metabolism in the brainstem and cerebellum (using positron emission tomography). Discussion – Conclusion – Clinical message : oral feeding is rare in VS/UWS patients (3% in our cohort). Based on neuroimaging results, this behaviour does not seem to be incompatible with the diagnosis of VS/UWS but the neuromecanistic root, which allows this behavior, still needs to be elucidate. This study also emphasizes the importance of assess and manage deglutition in patients with altered state of consciousness regardless of their level of consciousness. Tactile oro-facial stimulation, manual therapy, taste stimulation and therapeutic feeding can be another “gateway” to interact with these patients and improve their quality of life. [less ▲]

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See detailInfluence de la géométrie du quadrant amont et comportement hydraulique sous forte charge des seuils profilés standard
Erpicum, Sébastien ULiege; Pirotton, Michel ULiege; Blancher, Benoit et al

in Loudière, Daniel (Ed.) Hydraulique des barrages et des digues (2017, November)

In order to study the variation of the hydraulic characteristics of ogee-crested weirs for upstream heads higher than the design head, several profiles have been tested on an experimental facility ... [more ▼]

In order to study the variation of the hydraulic characteristics of ogee-crested weirs for upstream heads higher than the design head, several profiles have been tested on an experimental facility specifically designed and instrumented. These profiles have been defined regarding the real profiles of spillways of dams operated by EDF as well as the most used geometry of the literature. The experimental tests have been supplemented by numerical modeling, whose results were found to be very similar. The analysis shows that the discharge coefficient increases with the upstream head until head ratios around 5.5. This evolution follows very well the power equations from the literature. For higher head ratios, the discharge coefficient abruptly decreases from a value around 0.6 to a value around 0.55. This decrease corresponds to the apparition between the main flow and the weir of a low velocity area (the lower nappe does no more correspond to the weir profile). The analysis also shows a significant reduction of the discharge coefficient (around 10%) if the upstream quadrant design head is higher than 2 times the design head of the downstream quadrant. On the contrary, no modification of the discharge coefficient is measured if the upstream quadrant design head is smaller than the downstream quadrant one. [less ▲]

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See detailImproving QoE Prediction in Mobile Video through Machine Learning
Casas, Pedro; Wassermann, Sarah ULiege

in Proc. 8th International Conference on Network of the Future (2017, November)

Despite the massive adoption of HTTP adaptive streaming technology, buffering is still the most harmful event for QoE in video streaming. Previous studies have shown that buffering is not only detrimental ... [more ▼]

Despite the massive adoption of HTTP adaptive streaming technology, buffering is still the most harmful event for QoE in video streaming. Previous studies have shown that buffering is not only detrimental for the overall user experience, but is also highly correlated to viewer engagement. The occurrence of buffering is particularly critical in cellular networks and mobile video deployments, as network conditions are less stable and network resources more limited. In this context, monitoring and properly predicting the QoE of video streaming services becomes paramount to cellular network operators, who need to offer high quality levels to reduce the risks of customers churning for quality dissatisfaction. In this paper, we present a novel approach to multi-dimensional QoE prediction in mobile video using machine learning models. Contrary to previous models for QoE prediction in video streaming, which are generally uni- or low-dimensional and model the impact of single video descriptors independently, we use a high-dimensional input space to model the impact of buffering and initial delay on QoE.We train and test the proposed models on a publicly available mobile video dataset, generated from subjective QoE tests with real viewers. Besides improving prediction performance, the proposed models show that there is a clear influence of other buffering pattern descriptors generally neglected in previous models - in particular those linked to the occurrence of the last stalling event, shedding light on new KPIs to monitor for better QoE assessment in video streaming. [less ▲]

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See detailConclusion
Thirion, Paul ULiege

in Gillet, Florence (Ed.) Inside the user's mind : Étude des pratiques et besoins numériques des utilisateurs dans les centres d’archives et bibliothèques : Actes de la journée d’étude organisée dans le cadre du projet Maddlain le 22 février 2017 (2017, November)

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See detailDemonstrating GPIbα-thrombin interaction in procoagulant platelet formation leads to identification of potential specific inhibitors.
Bourcy, Morgane ULiege; Pasalic, Leonardo; Wang, Samuel et al

Conference (2017, October 30)

Procoagulant platelets are a highly activated platelets-subpopulation which support thrombin generation. We previously reported that coronary artery disease (CAD) patients have excess procoagulant ... [more ▼]

Procoagulant platelets are a highly activated platelets-subpopulation which support thrombin generation. We previously reported that coronary artery disease (CAD) patients have excess procoagulant platelet response to thrombin. Thrombin directly activates platelets via cleavage of PAR1 and PAR4, but is also known to interact with GPIbα via exosite II. Aim: To understand the mechanism of thrombin induced procoagulant platelets and to generate novel antiplatelet therapies. Hypothesis: Involvement of both PAR-dependent and GPIbα-thrombin interaction pathways. Methods: Procoagulant platelets detected by FACS (GSAO, P-selectin, lactadherin) in whole blood and washed platelets after treatment with PAR, GPIbα, exosite II inhibitors and heparins prior to thrombin stimulation. Results: Preincubation with combined PAR1 and PAR4 inhibitors reduced procoagulant platelet formation by 40±5.7%, indicating PAR pathways are not sufficient for thrombin effect. Thrombin exosite II was implicated by reduction of thrombin induced procoagulant platelets by exosite II targeting aptamer (92±4.1%) and heparin. Interaction with GPIbα was demonstrated using competition studies with recombinant soluble GPIbα, glycocalicin (49±7.7%). Involvement of the N-terminus of GPIbα was implied by use of NK protease which cleaves GPIbα proximal to the thrombin binding site (39.5±2.9%). Additive inhibition of procoagulant platelet formation after thrombin stimulation was achieved by combination of GPIbα cleavage and PAR1 and PAR4 inhibition. Having demonstrated a role for displacement of thrombin from GPIbα in targeting procoagulant platelet formation, we evaluated the effect of potential inhibitors of this binding on procoagulant platelet formation in healthy controls and CAD patients and one (inhibitor X) resulted in selective targeting of procoagulant platelets (40.5±10% and 40.6±9.5% respectively). Conclusion: The GPIbα/thrombin exosite II interaction is strongly implicated in thrombin induced procoagulant platelet formation. We identify a potential therapeutic that specifically targets procoagulant platelets as a possible adjunct anti-platelet therapy in CAD. We aim to confirm our results ex vivo and in vivo by using PAR4 knockout and GPIb mutated mice. [less ▲]

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See detailCarbon and nutrients sources and transformation in the River Sabaki, Kenya
Tamooh, FT; Shawlet, C; Borges, Alberto ULiege et al

Poster (2017, October 30)

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See detailAtelier de lecture - Freinet et la pédagogie 1.
Glorie, Caroline ULiege

Conference (2017, October 27)

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See detailMODEL FOR REASONING FROM SEMANTICALLY RICH POINT CLOUD DATA
Poux, Florent ULiege; Neuville, Romain ULiege; Hallot, Pierre ULiege et al

in ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences (2017, October 26), IV-4/W5

This paper proposes an interoperable model for managing high dimensional point clouds while integrating semantics. Point clouds from sensors are a direct source of information physically describing a 3D ... [more ▼]

This paper proposes an interoperable model for managing high dimensional point clouds while integrating semantics. Point clouds from sensors are a direct source of information physically describing a 3D state of the recorded environment. As such, they are an exhaustive representation of the real world at every scale: 3D reality-based spatial data. Their generation is increasingly fast but processing routines and data models lack of knowledge to reason from information extraction rather than interpretation. The enhanced smart point cloud developed model allows to bring intelligence to point clouds via 3 connected meta-models while linking available knowledge and classification procedures that permits semantic injection. Interoperability drives the model adaptation to potentially many applications through specialized domain ontologies. A first prototype is implemented in Python and PostgreSQL database and allows to combine semantic and spatial concepts for basic hybrid queries on different point clouds. [less ▲]

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See detailTOWARDS A DECISION SUPPORT TOOL FOR 3D VISUALISATION: APPLICATION TO SELECTIVITY PURPOSE OF SINGLE OBJECT IN A 3D CITY SCENE
Neuville, Romain ULiege; Pouliot, Jacynthe; Poux, Florent ULiege et al

in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2017, October 26), IV-4/W5

This paper deals with the establishment of a comprehensive methodological framework that defines 3D visualisation rules and its application in a decision support tool. Whilst the use of 3D models grows in ... [more ▼]

This paper deals with the establishment of a comprehensive methodological framework that defines 3D visualisation rules and its application in a decision support tool. Whilst the use of 3D models grows in many application fields, their visualisation remains challenging from the point of view of mapping and rendering aspects to be applied to suitability support the decision making process. Indeed, there exists a great number of 3D visualisation techniques but as far as we know, a decision support tool that facilitates the production of an efficient 3D visualisation is still missing. This is why a comprehensive methodological framework is proposed in order to build decision tables for specific data, tasks and contexts. Based on the second-order logic formalism, we define a set of functions and propositions among and between two collections of entities: on one hand static retinal variables (hue, size, shape…) and 3D environment parameters (directional lighting, shadow, haze…) and on the other hand their effect(s) regarding specific visual tasks. It enables to define 3D visualisation rules according to four categories: consequence, compatibility, potential incompatibility and incompatibility. In this paper, the application of the methodological framework is demonstrated for an urban visualisation at high density considering a specific set of entities. On the basis of our analysis and the results of many studies conducted in the 3D semiotics, which refers to the study of symbols and how they relay information, the truth values of propositions are determined. 3D visualisation rules are then extracted for the considered context and set of entities and are presented into a decision table with a colour coding. Finally, the decision table is implemented into a plugin developed with three.js, a cross-browser JavaScript library. The plugin consists of a sidebar and warning windows that help the designer in the use of a set of static retinal variables and 3D environment parameters. [less ▲]

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See detailRadicalisation violente des jeunes : des représentations aux interventions
Glowacz, Fabienne ULiege

Conference (2017, October 26)

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See detailArchitecture et spiritualité au XVIIe siècle : une comparaison avec les annonciades célestes
Piront, Julie ULiege

Conference (2017, October 26)

Dans le cadre du 4e centenaire de la fondation des Bénédictines de Notre-Dame du Calvaire, il s'agit de comparer la spiritualité de celles-ci et des annonciades célestes, deux ordres contemplatifs ... [more ▼]

Dans le cadre du 4e centenaire de la fondation des Bénédictines de Notre-Dame du Calvaire, il s'agit de comparer la spiritualité de celles-ci et des annonciades célestes, deux ordres contemplatifs contemporains, en tâchant de voir comment leurs dévotions respectives au Christ au travers de la figure de la Vierge (celle au pied de la Croix et de l'Annonciation) trouve écho dans le rapport de ces religieuses à leur cadre de vie. Au-delà de leurs spécificités et de leur histoire particulière, les annonciades célestes, les bénédictines du calvaire et sans doute aussi d’autres ordres encore ont trouvé le moyen de vivre leur spiritualité dans leur architecture terrestre. Loin de se soumettre passivement aux décrets tridentins, ces ordres sont parvenus à exploiter la clôture stricte qui leur est imposée pour développer une architecture matérielle, mais aussi faire ériger un espace spirituel à l’intérieur duquel les religieuses accomplissent leur union à Dieu, tout en construisant leur identité dans un contexte de multiplication des ordres religieuses et des réformes de certains d’entre eux. [less ▲]

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See detailPratique du Denɗiraagal ou parenté à plaisanterie dans le village de Djéwol (Mauritanie) : Enjeux et perspectives.
Sow, Aboubakry ULiege; Sow, Aboubakry ULiege

Conference (2017, October 25)

Le Denɗiraagal (en langue pulaar), Kulangoraxu (en soninké), Sinankunya (en bambara), Rakiré (en mossi), Kal (en wolof) ou parenté à plaisanterie est un type de relations particulièrement répandu en ... [more ▼]

Le Denɗiraagal (en langue pulaar), Kulangoraxu (en soninké), Sinankunya (en bambara), Rakiré (en mossi), Kal (en wolof) ou parenté à plaisanterie est un type de relations particulièrement répandu en Afrique de l'Ouest, et qui se caractérise par des échanges (de moquerie, d'entre-aide et de bienveillance) entre individus, communautés ou groupes sociaux, basés sur un pacte préalablement contracté par de lointains ancêtres. Chez les haalpulaar du village de Djéwol (Mauritanie), il existe deux types de Denɗiraagal: celui qui est interne à la communauté et celui qui est externe à la communauté. Ainsi, le Yano (procédé permettant d'activer ou de désactiver la parenté à plaisanterie déjà existante) peut se manifester à travers diverses expressions (verbales, gestuelles, faciales, sonores, etc.) servant à interpeller un parent à plaisanterie. En même temps, le yano apparaît comme un outil favorisant la création d’une nouvelle parenté à plaisanterie entre individus consentants. Dans ce qui suit, je tenterai d’abord de donner les différentes définitions du Denɗiraagal en milieu haalpulaar. Ensuite, j’aborderai la question de l’emploi des multiples techniques du yano et le fijirde denɗiraaɓe, qui proscrit toute bagarre en présence d’un parent à plaisanterie. Enfin, je mettrai en lumière le rôle que pourrait jouer le yano dans le cadre des tentatives de résolution des conflits fratricides qui déchirent encore aujourd'hui le continent africain. [less ▲]

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See detailPoésie et cosmologie
Delville, Michel ULiege; Bertrand, Jean-Pierre ULiege

Conference (2017, October 25)

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See detailParentalité en contexte de violence conjugale
Glowacz, Fabienne ULiege; Aït Hmad, Aicha; De Vliegher, Katty

Conference (2017, October 24)

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See detailIndexing grey multilingual literature in General Practice in the era of Semantic Web
Jamoulle, Marc ULiege; Resnick, Melissa; Ittoo, Ashwin ULiege et al

in The Grey Journal (2017, October 23)

voir abstract ci-dessous

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See detailL’Antiquité pour convaincre. L’histoire romaine dans les libelles de la Ligue parisienne (1585-1594) : rhétorique et circulation du savoir historique
Goderniaux, Alexandre ULiege

Conference (2017, October 23)

Les écritures du passé dans les libelles de la Ligue parisienne (1585-1594) sont tout particulièrement protéiformes. Par une approche pratique des modalités dans lesquelles ces pamphlets convoquent les ... [more ▼]

Les écritures du passé dans les libelles de la Ligue parisienne (1585-1594) sont tout particulièrement protéiformes. Par une approche pratique des modalités dans lesquelles ces pamphlets convoquent les figures et les préceptes de la Rome ancienne, la communication visera à apporter un nouvel éclairage sur l’impact de l’Antiquité sur la pensée moderne. Les libelles ligueurs sont des textes d’action dont la principale – sinon la seule – raison d’être est de convaincre ceux qui les lisent ou les entendent d’agir conformément aux recommandations du camp ultra-catholique ennemi de Henri de Bourbon. Issus d’une culturel foncièrement orale, il s’agit plus de supports de discours que de livres de collection. L’influence de la rhétorique y est dès lors considérable. C’est pourquoi la première partie de la communication ambitionne de montrer comment les libellistes ont puisé dans le vivier des exempla antiques, ce que les rhétoriciens nomment dispositio : chaque auteur procède-t-il de façon identique ? Leurs méthodes oratoires sont-elles héritées ou créées pour l’occasion ? Comment se combinent-elles ? Que reste-t-il de l’histoire antique après ce passage à la moulinette rhétorique ? Les libellistes ligueurs manipulent-ils les figures romaines comme des modèles parmi d’autres ou accordent-ils un statut privilégié à ces prestigieux exempla ? De nombreux exemples représentatifs seront utilisés pour illustrer cette partie technique. La seconde partie visera à éclairer une étape encore plus fondamentale des modalités d’utilisation de l’histoire antique dans l’écriture polémique, à savoir la sélection des figures et des préceptes aptes à convaincre, que les rhétoriciens nomment inventio. Ce sera l’occasion de démonter combien les écritures de l’Antiquité romaine dans libelles de la Ligue illustrent parfaitement la transition « des “histoires” à “l’historique” » (D. Woolf) typique du xvie siècle. Les auteurs des libelles, essentiellement des juristes et des prédicateurs, ne sont pas des spécialistes de l’histoire mais de la rhétorique : comme de brefs exemples permettront de le démontrer, dans le but de convaincre, ils manipulent des références romaines qu’ils ne maîtrisent que superficiellement. Plusieurs hypothèses pourront être établies à propos de la nature des sources dans lesquelles les exempla antiques sont sélectionnés, de la méthode de recopiage de passages d’histoire ancienne et de leur mobilisation au service d’un argumentaire politique. Étudiant ces sources longtemps délaissées par les historiens sous les angles successifs de la dispositio et de l’inventio, la communication entend démontrer que la production d’« historiens sans le vouloir ou sans le savoir » (F. Lestringuant) permet, tout autant que les grands livres d’histoire, de déterminer la prégnance et les modalités de convocation de la culture historique antique dans une société donnée. Un bénéfice d’une telle approche est de prendre la mesure de la fragmentation et de la polymorphie de l’héritage antique aux Temps modernes. En conclusion, on essayera de répondre à une dernière question : cette présence et ces modalités de convocation de l’histoire romaine dans les libelles ligueurs sont-ils une exception, ou un chaînon entre l’histoire antique et notre culture historique actuelle ? [less ▲]

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See detailAstronomical calibration of the Famennian (Upper Devonian) time scale
Pas, Damien ULiege; Hinnov, Linda; Day James (Jed), James E et al

in Geological Society of America Abstracts with Programs. Vol. 49, No. 6 (2017, October 23)

The Late Devonian was affected by major, irreversible changes including two of the most severe biodiversity crises in Earth’s history, the so-called Kellwasser and Hangenberg Events (respectively near the ... [more ▼]

The Late Devonian was affected by major, irreversible changes including two of the most severe biodiversity crises in Earth’s history, the so-called Kellwasser and Hangenberg Events (respectively near the Frasnian – Famennian (F-F) and the Devonian – Carboniferous (D-C) boundaries). Currently, hypotheses for the Late Devonian extinctions include sea-level fluctuations and regression, climate cooling, ocean anoxia, massive volcanism and/or bolide impact. Unfortunately, testing these hypotheses is impaired by a lack of sufficient temporal resolution in paleobiological, tectonic and proxy climate records. Recent advances in astronomical calibration have improved the accuracy of the Frasnian time scale and part of the Famennian. However, the time duration of the Famennian Stage remains poorly constrained. During the Late Devonian, an epieric sea in North-America mid-continent occupied the Illinois Basin where a complete Late Frasnian – Early Carboniferous succession of deep-shelf deposits was archived. A record of this sequence is captured in three overlapping cores (H-30, Sullivan Slough and H-32). The H-30 core section spans the F-F boundary; the Sullivan Slough section spans almost all of the Famennian and the H-32 section sampled spans the D-C boundary. To have the best chance of capturing Milankovitch cycles, 2200 rock samples were collected at minimum 5-cm-interval across the entire sequence. Magnetic susceptibility (MS) was measured on each sample and the preservation of climatic information into the signal was verified through geochemical analyses. To estimate the duration of the Famennian stage, we applied multiple spectral techniques and tuned the MS signal using the highly stable 405 k.y. cycle for Sullivan Slough and the obliquity cycle (34.4 k.y.; Waltham, 2015) for the H-30 and H-32 cores. Based on the correlation between the cores and the tuning, we constructed a Famennian astronomical time scale, which indicates a duration of 13.3 m.y. An uncertainty of ± 0.5 m.y. was calculated to assess the errors raising from the stratigraphic position of the F-F and D-C boundaries, and the 405 k.y. cycle counting error. Our estimate duration is very close to the GTS-2012 duration (Becker, 2012) interpolated from the high-resolution (U/Pb) radiometric ages available for the uppermost Devonian. [less ▲]

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See detailHyperoxalurie primaire et calculs de Caoxite - Case report
Castiglione, Vincent ULiege

Conference (2017, October 20)

Nous décrivons ici le cas d’un patient de 21 ans atteint d’hyperoxalurie primaire de type I suivi depuis 2015 au CHU de Liège. Le diagnostic a été confirmé chez le patient dès ses 3ans par test génétique ... [more ▼]

Nous décrivons ici le cas d’un patient de 21 ans atteint d’hyperoxalurie primaire de type I suivi depuis 2015 au CHU de Liège. Le diagnostic a été confirmé chez le patient dès ses 3ans par test génétique. Les mutations en cause sont c.969-3C>G et c.725C>A, laissant une activité résiduelle de l’alanine glyoxylate aminotransférase estimée à 3%. L’oxalurie de 24h était comprise entre 100 et 170mg/g de créatinine lors des dernières biologies. Le traitement médicamenteux inclus de la pyridoxine (2x250mg/j) et du citrate de potassium (+/-10g/j). Une sonde de gastrotomie a également été instaurée pour gavage hydrique nocturne. Le patient a subi plus de 12 interventions urologiques au cours des 3 années précédentes. Aussi, la fonction rénale a progressivement décliné en passant de >60 à 40mL/min/1.73m² notamment à cause de la compliance difficile au traitement. Aucune manifestation extrarénale de l’oxalose n’est encore survenue. L’analyse infrarouge des calculs de 2015 et 2016 renseignaient une composition exclusive de Whewellite. L’analyse morphologique identifiait initialement des calculs de type Ia, mais plus récemment, ceux-ci ont commencé à prendre une structure inhabituelle moins organisée. Les derniers calculs expulsés en 2017 présentaient quant à eux un faciès bien particulier avec de grands cristaux anguleux aux angles non quadratiques. L’analyse infrarouge a permit de détecter la présence de Caoxite (oxalate de calcium trihydraté) au sein de deux séries de calculs. En guise de confirmation, une étude de la cristallurie a mis en évidence des cristaux au faciès typique de la caoxite. La formation de ces calculs particuliers pourrait être associée à plusieurs éléments, comme la prise de bicarbonate de calcium accompagnée d’une hypercalcémie (malgré une calciurie basse inférieure à 3mg/24h). Aussi, la baisse de la fonction rénale et une augmentation de la citraturie de 24h étaient concomitants. Par contre, aucune augmentation significative de l’oxalurie n’a pu être observée. Les mécanismes précis ayant menés à la précipitation de caoxite restent flous, sachant que ce composé n’a à notre connaissance, été décrit que lors de la prise de glyoxylate. [less ▲]

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See detailDo Property Rights and Equality Make Good Bedfellows ? European perspective
Grandjean, Geoffrey ULiege

Conference (2017, October 20)

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See detailBeech phenology and productivity at the Vielsalm Terrestrial Observatory
Hurdebise, Quentin ULiege; Vincke, Caroline; De Ligne, Anne ULiege et al

Poster (2017, October 20)

Temperate forests, as other ecosystems and oceans, mitigate the accumulation in the atmosphere of CO2, the main responsible for the current climate change. It is, therefore, a necessity to understand how ... [more ▼]

Temperate forests, as other ecosystems and oceans, mitigate the accumulation in the atmosphere of CO2, the main responsible for the current climate change. It is, therefore, a necessity to understand how these forests react and will react in a changing environment. That requires long-term simultaneous monitoring of the forest productivity and phenology as well as of climatic variables. Using the 20 years dataset from the Vielsalm Terrestrial Observatory (VTO), an eddy covariance site located in a mixed forest in east Belgium and dominated by beeches, the relations between phenological and productivity indicators were analyzed. Phenological indicators (leaf out beginning, duration and ending as well as leaf fall date) were derived from the relative light transmissivity through the canopy and from the temporal dynamic of the Net Ecosystem Productivity (NEP). No trend was observed for these indicators during the last two decades, but significant relations were found between them and between them and climatic variables. Productivity indicators were derived from eddy covariance measurements (NEP), tree ring widths (growth index) and masting intensity. Growth index was significantly related to the NEP and a reverse proportionality to the masting intensity was found. The analysis of the relation between the beech stand NEP and the phenology gives us evidences that annual NEP is significantly related to the length of the carbon uptake period. A model combining the length of the carbon uptake period and the photosynthetic capacity of the ecosystem was able to predict more than two third of the interannual variability at the VTO. This work underlines the multiplicity of the relation between phenological and productivity indicators. [less ▲]

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See detailESTROGEN RECEPTORS AND ESTETROL-DEPENDENT NEUROPROTECTIVE ACTIONS: A PILOT STUDY
Tskitishvili, Ekaterine ULiege; Pequeux, Christel ULiege; Munaut, Carine ULiege et al

Conference (2017, October 20)

Context: Estetrol (E4) has strong antioxidative, neurogenic and angiogenic effects in neural system resulting in the attenuation of neonatal hypoxic–ischemic encephalopathy. Objective: We aimed to define ... [more ▼]

Context: Estetrol (E4) has strong antioxidative, neurogenic and angiogenic effects in neural system resulting in the attenuation of neonatal hypoxic–ischemic encephalopathy. Objective: We aimed to define the role of estrogen receptors in E4-dependent actions in neuronal cell cultures and prove the promyelinating effect of E4. Methods: In vitro the antioxidative and cell survival/proliferating effects of E4 on H2O2-induced oxidative stress in primary hippocampal cell cultures were studied using different combinations of specific inhibitors for ERα (MPP dihydrochloride), ERβ (PHTTP), GPR30 (G15) and palmytoilation (2-BR). LDH activity and cell survival assays were performed. In vivo the promyelinating role of different concentrations of E4 (1 mg/kg/day, 5 mg/kg/day, 10 mg/kg/day, 50 mg/kg/day) was investigated using the hypoxic–ischemic brain damage model in the 7-day-old immature rats before/after the induction of hypoxic–ischemic insult. Myelin basic protein (MBP) immunostaining was performed on brain coronal sections. Results: Our results show that LDH activity is significantly upregulated in cell cultures where the E4’s effect was completely blocked by concomitant treatment either with ERα and ERβ inhibitors (MPP and PHTPP, respectively), or ERα and ERβ inhibitors combined with 2-BR. Cell survival is significantly downregulated in cell cultures where the effect of E4 was blocked by ERβ inhibitor (PHTTP) alone. The blockage of GRP30 receptor did affect neither LDH activity nor cell survival. MBP immunostaining is significantly upregulated in E4-pretreated groups at a concentration of 5 mg/kg/day and 50 mg/kg/day E4, whereas the MBP-positive area OD ratio is significantly increased in all the E4-treated groups. Conclusions: E4’s antioxidative actions mostly depend on ERα and ERβ, whereas neurogenesis and possibly promyelinating activities might be realized through ERβ. [less ▲]

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See detailEnvironmental controls of methanol emissions from a grazed grassland in Dorinne, Belgium
Michel, Colin ULiege; Heinesch, Bernard ULiege; Bachy, Aurélie ULiege et al

Poster (2017, October 20)

Despite the growing interest for oxygenated volatile organic compounds (OVOC) over the last 15 years due to their role in the atmospheric chemistry, current knowledge about OVOC exchanges by grassland and ... [more ▼]

Despite the growing interest for oxygenated volatile organic compounds (OVOC) over the last 15 years due to their role in the atmospheric chemistry, current knowledge about OVOC exchanges by grassland and the environmental factors driving them remains lacunar. However, those ecosystems represent an important part of the total earth surface (13.37%). This study conducted on a grazed grassland therefore aims to quantify OVOC exchanges over full grazing seasons in order to understand the mechanisms behind these exchanges. It took place within the activities of the CROSTVOC project (CROp Stress VOC) and therefore gives an important attention to the stress induced fluxes. BVOC flux measurements were performed with a PTR-MS for the measurements of OVOC mixing ratios on two different scales: the eddy Covariance method was used during two whole grazing seasons (2014 and 2015) and in the 2016 summer, measurements were also performed on a smaller scale by using all-teflon automated dynamic chambers. The chambers allowed measuring accurately the impact of grazing by following simultaneously undisturbed and grazed grassland patches. This study pointed out that several OVOC were exchanged in variable quantities, with methanol being by far the most important. Methanol fluxes exhibited a clear diurnal cycle with close-to-zero fluxes at night and maximum fluxes at midday. The flux was also much larger in the summer than during autumn or spring. For the eddy Covariance data, the average methanol flux in the summer (0.033 μg.m-2s-1) was in the same range of other studies, being lower than the average found by Bamberger et al. in 2010 (0.080 μg.m-2s-1) and by Ammann (0.077 μg.m-2s-1). Fluxes from the chambers were slightly lower with an average value of 0.27 μg.m-2s-1 but they were measured in the late summer. Driver analysis is still ongoing but first results showed that the flux was strongly correlated at short time scale (half hourly for the EC method and one and a half hourly for the chambers) to the photosynthetic photon flux density and the latent heat flux. We believe that their influence comes mainly from the control practiced by stomatal conductance in non-steady state conditions and expansion of cell walls in steady state conditions. The cuvette data showed that grazing resulted in significantly enhanced emissions of methanol that lasted for several days. On the contrary, the eddy Covariance method cannot distinguish between grazed and non-grazed grass and only a small fraction of the method footprint had been grazed the previous days on average. Our eddy-covariance data suggested that an increase in the stocking density did not contribute to a significant rise of methanol emission. The limited variability in stocking density during the two growing seasons and the more powerful effect of other drivers likely induced that the flux variability due to the SD was too low to be measured by the eddy Covariance method. In depth comparisons between the eddy-covariance data and the dynamic chambers data will be carried out. [less ▲]

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See detailLiaison externe et soignants du domicile: symphonie et fausses notes
Belche, Jean Luc ULiege

Conference (2017, October 20)

Analyser le processus en cours pour mieux le comprendre.

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See detailDes femmes face aux hommes de métier : concevoir et bâtir des monastères féminins sur la dorsale catholique (17e-18e s.)
Piront, Julie ULiege

Conference (2017, October 20)

Dans les années qui suivent leur établissement en milieu urbain, les religieuses sont amenées à aménager puis à ériger des bâtiments conventuels conformes à leurs besoins et à leur mode de vie. Malgré la ... [more ▼]

Dans les années qui suivent leur établissement en milieu urbain, les religieuses sont amenées à aménager puis à ériger des bâtiments conventuels conformes à leurs besoins et à leur mode de vie. Malgré la stricte clôture que leur impose le concile de Trente, les religieuses se doivent de faire appel à des professionnels du bâti et de passer des contrats avec une main d’œuvre généralement masculine, qu’il s’agisse d’architectes, d’entrepreneurs ou d’artisans. Cette communication propose d’analyser la manière dont différentes congrégations religieuses implantées sur la « dorsale catholique » (annonciades célestes, bénédictines de la Paix Notre-Dame, ...) sont parvenues à recruter ces hommes de terrain, à guider la conception du plan, à surveiller le déroulement du chantier et le cas échéant, à affirmer leurs compétences. Dans un premier temps, sera analysé le discours normatif des règles et constitutions qui encadrent ces rapports avant de les confronter, dans un second temps, aux témoignages et au vécu de ces femmes livrés par leurs écrits (chroniques, annales, biographies de religieuses) aux XVIIe et XVIIIe siècles, inédits pour la plupart. [less ▲]

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See detailPoints de vue de dominants sur les prostitutions en Fédération Wallonie – Bruxelles
Govers, Patrick; Absil, Gaëtan ULiege

Conference (2017, October 20)

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See detailLieu de vie, lieu de travail. L'institution et le bien-être
Nisen, Laurent ULiege

Conference (2017, October 20)

Présentation de la session Braises consacrée au bien-être (des travailleurs, des résidents) en institution

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See detailLooking for Smaug and the golden mountain. Are fictional objects Kripkean or Meinongian?
Leclercq, Bruno ULiege

Conference (2017, October 20)

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See detailUpscaling winter wheat above-ground biomass measurements using multispectral imagery and 3D data from unmanned aerial vehicle
Michez, Adrien ULiege; Bauwens, Sébastien ULiege; Heinesch, Bernard ULiege et al

Poster (2017, October 20)

Field measurements in the ICOS program are spatially limited whereas the monitored gas fluxes may have a large footprint. Aerial remote sensing has the advantage to monitor large areas. The main goal of ... [more ▼]

Field measurements in the ICOS program are spatially limited whereas the monitored gas fluxes may have a large footprint. Aerial remote sensing has the advantage to monitor large areas. The main goal of our research was to test the potential of unmanned aerial vehicles (UAV) to upscale parameters monitored through the ICOS program. In this study, we specifically focus on above-ground biomass (AGB) monitoring in a winter wheat crop. We used a octocopter drone (X frame type) to acquire a time series over the crop growing season (8 flights from the 14th of February 2017 to the 7th of July 2017) of multispectral imagery covering the ICOS candidate station of Lonzée (Wallonia, Belgium) and the surrounding field crop areas (ca. 0.25 km² per flight). The multispectral camera provides spectral information on the green (550 +/- 50 nm), red (660 +/- 50 nm), near infrared (735 +/- 50 nm) and red-edge (790 +/- 10 nm) wavelengths bands. The UAV also brought an off-the-shelf high resolution (20 Mpx) RGB camera to derive accurate 3D data. We performed a photogrammetric 3D reconstruction of the acquired imagery for every flight survey. The images provided by the RGB sensor (Sony RX100) were used to produce a high spatial resolution Digital Surface Model (0.05 m) and the images acquired by the multispectral sensor were used to derive reflectance maps (0.1 m) in the four wavelengths bands. The four reflectance layers were combined to produce two straight-forward vegetation indices (Normalized Difference Vegetation Index and Green NDVI). The photogrammetric DSM’s were combined to a LiDAR Digital Terrain Model (public database, survey in winter 2013) to produce Crop Height Models (CHM) of the study area. We used multiple linear regressions modelling in order to predict the AGB of the field crop monitored by the ICOS station of Lonzée with UAV imagery. AGB=a+b*GNDVI+c*NDVI+d *CHM The field crop data were provided by the ICOS program and by field research conducted in experimental field crops close to the flux tower. The field sampling consisted in destructive samples of the crop which were weighted after drying. For each field sample, an associated area was computed based on the outdistance sowing and the number of sampled crops in order to compute an AGB per area unit (t / Ha). Each AGB field estimation was associated to the closest flight date to build a multi date model presenting good performances (r² = 0.85, RMSE = 2.3 t/Ha). We used the same modelling approach to adjust a single date model to derive a predicted AGB map for the 7th of July. The performance of the single date model is lower but still highlights the biomass variation within the crop (r² = 0.71, RMSE = 1.9 t/Ha). The predicted AGB map displays a high spatial heterogeneity with some spatial patterns. Locally low AGB values are found along two old pedestrian whereas higher AGB values can be associated to areas which were sprayed twice (in-between two tractor tracks). Our results highlight the potential of UAV multispectral imagery to monitor the AGB variation within the footprint of the flux tower and highlight the need for repeated field sampling with a precise geolocation to improve the matching between the flight and the field surveys. [less ▲]

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See detailEvaluation of the Xpert®GBS LB test (Cepheid) performed on antenatal screening LIM enrichment broth for detection of Streptococcus agalactiae or group B streptococcus, compared to the reference culture method.
MEEX, Cécile ULiege; DUPONT, Audrey; SACHELI, Rosalie ULiege et al

Conference (2017, October 19)

PCR, performed on LIM enrichment broth compared wit the reference method, that is subculture on selective differential agar performed from the same incubated Lim broth inoculated with a vagino-rectal swab ... [more ▼]

PCR, performed on LIM enrichment broth compared wit the reference method, that is subculture on selective differential agar performed from the same incubated Lim broth inoculated with a vagino-rectal swab collected at 35-37 weeks’ gestation. Material/methods: During an 8-months period in 2015-2016, series of consecutive vagino/rectal swabs collected for antenatal GBS screening (at the university hospital of Liege, Belgium) were plated first on Granada agar and then inoculated in selective enrichment LIM broth. The incubated broth was further sub-cultured on Granada and Biorad StrepBselect agars. Moreover, a sterile swab immersed in the same incubated broth was further analyzed by a real-time PCR targeting GBS using the Xpert®GBS LB test on the GeneXpert® system (Cepheid). Results: Among the 288 antenatal screenings included in the study, 48 (16.7%) were positive for GBS using the culture reference method and 51 Xpert®GBS LB test were positive (17.7%), includin the 48 samples positive in culture and 3 additional specimens for witch culture remained negative. Considering the enriched culture as the gold standard, the sensitivity and specificity of the Xpert®GBS LB test were 100% and 98.8% respectively. Conclusions: The Xpert®GBS LB test performed on incubated LIM broth is at least as efficient as selective enriched culture for antenatal screening of GBS. The turnaround-time and hands-on-ti are much shorter for the Xpert® GBS LB but it is more expensive than culture method, which may limit its use. [less ▲]

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See detailL'université de Liège a deux cents ans: quel bilan dresser quant à l'évolution des enjeux de genre?
Gavray, Claire ULiege; dor, juliette

Conference (2017, October 19)

présentation de l'ouvrage 'Où sont les femmes? La féminisation à l'université de Liège'.

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See detailAn open question about diametral dimensions
Demeulenaere, Loïc ULiege

Conference (2017, October 19)

The diametral dimension is a topological invariant which characterizes Schwartz and nuclear spaces. However, there exists another diametral dimension which was conjectured by Bessaga, Mityagin, Pełczynski ... [more ▼]

The diametral dimension is a topological invariant which characterizes Schwartz and nuclear spaces. However, there exists another diametral dimension which was conjectured by Bessaga, Mityagin, Pełczynski, and Rolewicz to be equal to the first one in Fréchet spaces. In this talk, we describe some conditions which assure the equality of the two diametral dimensions in metrizable locally convex spaces. Besides, we explain why such an equality is generally impossible in non-metrizable spaces. [less ▲]

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See detailImportance et métamorphoses du conte dans le cartoon à l'époque des studios. De Walt Disney à Tex Avery.
Moreau, Timothée ULiege

Conference (2017, October 19)

Au cinéma, le conte s’est exemplairement exprimé sous la forme de l’animation, et plus précisément du dessin animé. Les contes européens fournissent en effet un réservoir considérable de scénarios et de ... [more ▼]

Au cinéma, le conte s’est exemplairement exprimé sous la forme de l’animation, et plus précisément du dessin animé. Les contes européens fournissent en effet un réservoir considérable de scénarios et de personnages aux réalisateurs de dessins animés, et ceci depuis les débuts du cinéma d’animation (S. Denis, 2015). Cette utilisation du conte se révèle particulièrement intensive dans les dessins animés américains (cartoons) des années 1940 et 1950. Ces cartoons sont alors produits à la chaîne par les studios et diffusés dans les salles de cinémas à côté des films et des actualités. Les studios Disney, ainsi que ceux de la Warner et de la MGM (où officie Tex Avery) emploient ainsi massivement le conte, mais non sans en actualiser les modalités de manières fort différentes. Or, ces utilisations diverses du conte ne sont pas sans conséquences esthétiques plus larges. Ainsi, si les studios Disney voient généralement dans le conte l’occasion de développer un univers merveilleux à la morale traditionnelle, Tex Avery (et, dans une moindre mesure, les réalisateurs de la Warner) limite généralement son utilisation à quelques clins d’œil à la culture populaire ou à une structure narrative connue. Cependant, cette actualisation apparemment superficielle du conte par les concurrents de Disney répond également à une logique d’opposition esthétique : le conte ne peut être pris au sérieux car il est l’instrument de l’ennemi. Les torsions subies par les différents éléments du conte dans les dessins animés de Tex Avery ou de plusieurs réalisateurs de la Warner visent en effet à critiquer directement une certaine manière de faire du cartoon. Les productions des studios Disney étant jugées par leurs concurrents comme mièvres et idiotes. L’univers esthétique et narratif du medium tout entier est ainsi en jeu dans l’utilisation qui est faite du conte, c’est du moins ce que nous essayerons de montrer. [less ▲]

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See detailStatus of Diva online as VRE application
Barth, Alexander ULiege; Troupin, Charles ULiege; Watelet, Sylvain ULiege et al

Conference (2017, October 19)

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See detailDieux romains : identités, modes d’actions, réseaux. Une introduction.
Berthelet, Yann ULiege; Van Haeperen, Françoise

Conference (2017, October 19)

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See detailLes risques toxicologiques liés aux médicaments de qualité inférieure
Marini Djang'Eing'A, Roland ULiege; Kalenda Tshilombo, Nicodème ULiege; Ciza Hamuli, Patient ULiege et al

Conference (2017, October 19)

Objective: Poor quality medicines regrouping counterfeit/falsified, sub-standards and degraded are a scourge for developing countries (1). Their public health consequences are often observed for cases of ... [more ▼]

Objective: Poor quality medicines regrouping counterfeit/falsified, sub-standards and degraded are a scourge for developing countries (1). Their public health consequences are often observed for cases of low dosage of active ingredients and sometimes for the absence of these. On the basis of the observed facts as well as suspected reported cases, we were interested in deepening the information through laboratory tests. Methods: Liquid chromatography (LC), thin layer chromatography (TLC), nuclear magnetic resonance (NMR), mass spectrometry (MS), Raman imagery (Rim) and near infrared spectroscopy (NIR) were used as targeted analytical techniques in this study, associated with the principal component analysis (PCA), while the suspect samples were obtained via the public health authorities of the DR Congo, Benin and Rwanda after their seizure. Results: The observed cases are presented by therapeutic class, namely: - analgesics: (1) cases of tablets supposed to contain paracetamol and which have caused abnormal adverse effects in patients who have consumed it, namely sedative effects, polyuria and hypotension. Using LC and complementary surveys by people interview, we were able to demonstrate the presence of a benzodiazepine and at very high doses. (2) Cases of paracetamol syrup whose excipient (glycerol) was substituted by diethylene glycol and which had caused the death of a hundred babies. Using the NIR and the PCA, we were able to elucidate this substitution. - antimalarials: (case 1) cases of arthemether-lumefantrine tablets which had no therapeutic effect. By means of TLC and LC, the absence of these two active ingredients was clearly demonstrated, but the presence of starch was revealed by Rim. (Case 2) case of quinine tablets that had no expected pharmacological effect. The use of several combined techniques (TLC, LC-MS, NMR and Rim) made it possible to demonstrate the presence of a substance with an imidazole structure (antamoeba). - antibiotics: (1) amoxicillin powder which after reconstitution in hospital caused poisoning of the babies until death for some. The reconstitution of the suspension had revealed the misuse of hydrogen peroxide instead of distilled water. (2) Finally a large-scale study (80 samples of amoxicillin powder) showed that 8% of the samples were above the claimed dosage. Conclusion: The cases presented indicate that there are effectively poor quality medicines and that they are responsible of public health problems and in particular of toxicity. Appropriate measures should be taken to protect users. [less ▲]

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See detailIndividuality Through Relatedness: A Leibnizian Framework for Quantum Mechanics
Dony, Arthur ULiege

Conference (2017, October 18)

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See detailMRI-based mapping of the dorsal premotor cortex (PMd)
Genon, Sarah ULiege; Eickhoff, Simon

Conference (2017, October 18)

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See detailThe quality of artemether-lumefantrine combination and characteristics of pharmacies in the periurban areas of kinshasa
Mavungu Landu, Don Jethro ULiege; Liégeois, Sophie; Manzambi Kuwekita, Joseph ULiege et al

Conference (2017, October 18)

QUALITÉ DE LA COMBINAISON THERAPEUTIQUE ARTEMETHER-LUMEFANTRINE ET CARACTÉRISTIQUES DES PHARMACIES EN TERRITOIRES PÉRIURBAINS DE KINSHASA Mavungu Landu DJ.1,2, Liégeois S., Manzambi Kuwekita J.3,4, Mbinze ... [more ▼]

QUALITÉ DE LA COMBINAISON THERAPEUTIQUE ARTEMETHER-LUMEFANTRINE ET CARACTÉRISTIQUES DES PHARMACIES EN TERRITOIRES PÉRIURBAINS DE KINSHASA Mavungu Landu DJ.1,2, Liégeois S., Manzambi Kuwekita J.3,4, Mbinze J.5, Mavungu Nsiona J.6,Hubert P.1, Michel B.2,7, Gretry L.8, Minga Kwete M.9, Reginster J-Y.3, Frédérich M.1, Marini Djang'Eing'A R.1 1 Département de Pharmacie, Université de Liège, Liège, Belgique; 2 Ecole Régionale Postuniversitaire d’Aménagement et de Gestion intégrés des Forêts et Territoires tropicaux, Kinshasa, RDC; 3 Département des Sciences de la Santé Publique, Université de Liège, Liège, Belgique; 4 Section de Santé Communautaire, Institut Supérieur des Techniques Médicales de Kinshasa, Kinshasa, RDC; 5 Département de Galénique et d’Analyse des Médicaments, Université de Kinshasa, Kinshasa, RDC; 6 Division Provinciale de la Santé, Kinshasa, RDC; 7 Faculté Universitaire des Sciences Agronomiques de Gembloux, Université de Liège, Gembloux, Belgique; 8 Plateforme Afrique Centrale, PACODEL, Kinshasa, RDC; 9 Secure drug, Kinshasa, RDC. Introduction: Le paludisme causé par le Plasmodium falciparum demeure un problème majeur de santé publique. Le traitement avec des antipaludiques de bonne qualité est une composante importante dans le contrôle de cette maladie. Cependant en Afrique centrale, plus de 25% des médicaments serait contrefaits ou de qualité inférieure, situation qui serait encore plus dramatique dans les territoires périurbains. Objectif: Afin de permettre une sensibilisation des populations vivant dans ces milieux, une étude a été menée dans le but d’évaluer l’existant au niveau sanitaire pharmaceutique. Méthodes: Dans le contexte ci-mentionné, une étude préliminaire et prospective a été menée dans la zone de santé de Mont Ngafula 1 située dans les territoires périurbains de la Ville de Kinshasa durant la période allant du 22 février au 10 décembre 2016. Trente échantillons de poudre pour suspension d’artéméther et de luméfantrine ont été collectés. L’analyse de la qualité de ces médicaments a été réalisée au moyen de méthodes séparatives génériques utilisant la technique de chromatographie liquide à haute performance couplé à un détecteur à barrettes de diodes. Une caractérisation a été également effectuée dans 127 établissements pharmaceutiques sur base des normes édictées par le Ministère de la Santé Publique congolais. Résultats: Le résultat des analyses des échantillons d’antimalariques (ou antipaludéens) montre qu’une poudre pour suspension d’artéméther et de luméfantrine sur trois (33,3%) ne contenait pas la concentration prévue en artéméther et/ou en luméfantrine. Par ailleurs, le résultat des observations évoque qu’aucun établissement pharmaceutique ne respectait l’ensemble des normes du Ministère de la Santé Publique. Conclusion: Cette étude nous apprend qu’en territoires périurbains de Kinshasa, un échantillon sur trois (33,3%) de la combinaison Artéméther-Luméfantrine est non conforme, les suspensions sont sous-dosées. Quant aux pharmacies existantes, aucune d’entre elles ne respecte l’ensemble des normes minimales édictées par le Ministère de la Santé Publique de la RDC. [less ▲]

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See detailCases en cut-up: une lecture grammatextuelle de Last Look de Charles Burns
Crucifix, Benoît ULiege

Conference (2017, October 18)

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See detailPhosphorous from Sludge: Extraction Expertise at ULiège
Pfennig, Andreas ULiege; Shariff, Zaheer Ahmed ULiege

Poster (2017, October 18)

In the PhosForYou project, the PASCH process, formerly designed to recover phosphorous from sewage-sludge incineration ash, is extended to start from dried sewage sludge directly. One of the major steps ... [more ▼]

In the PhosForYou project, the PASCH process, formerly designed to recover phosphorous from sewage-sludge incineration ash, is extended to start from dried sewage sludge directly. One of the major steps in this process is the reactive extraction of heavy metals from a leach liquor, followed by fractional precipitation. The process is realized on pilot-plant scale and tested in bypass at waste-water treatment plants. The process param-eters will be optimized to maximize process efficiency depending on the local situation with respect to impurities and water content. The product is a phosphate, which can directly be used in fertilizer formulations. [less ▲]

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See detailAQUAPONIC SLUDGE DIGESTION FOR ORGANIC REDUCTION AND NUTRIENT REMINERALIZATION IN UASB REACTOR.
Delaide, Boris ULiege

Conference (2017, October 18)

These first results on aquaponic sludge digestion are promising and highlight the interest to treat sludge directly onsite in order to reduce aquaponic system wastes and thus its impact on the environment ... [more ▼]

These first results on aquaponic sludge digestion are promising and highlight the interest to treat sludge directly onsite in order to reduce aquaponic system wastes and thus its impact on the environment and at the same time increase plant yield. [less ▲]

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See detailTradition des textes épiques et sacré
Henrard, Nadine ULiege

Conference (2017, October 18)

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See detailNew Diva capabilities for climatologies
Barth, Alexander ULiege; Troupin, Charles ULiege; Watelet, Sylvain ULiege et al

Conference (2017, October 17)

Detailed reference viewed: 23 (1 ULiège)