References of "Scientific congresses and symposiums"
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See detailAdvanced oxidative treatment for waste water contamined by pharmaceutical products
Belet, Artium ULiege; Vreul, Christelle; Gillard, Nathalie et al

Conference (2017, July 07)

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

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

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

Conference (2017, July 07)

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

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

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See detailContinuous-flow preparation of γ-butyrolactone scaffolds from renewable fumaric and itaconic acids under photosensitized conditions
Gerardy, Romaric ULiege; Winter, Marc; Horn, Clemens R. et al

Poster (2017, July 06)

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

Conference (2017, July 06)

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

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

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

Conference (2017, July 06)

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

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

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

Conference (2017, July 06)

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

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

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

Poster (2017, July 06)

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

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

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

Conference (2017, July 06)

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

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

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

Conference (2017, July 06)

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

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

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

Conference (2017, July 05)

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

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

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

Conference (2017, July 05)

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

Conference (2017, July 04)

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

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

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

Conference (2017, July 04)

Detailed reference viewed: 36 (16 ULiège)
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See detailConditions, apports et limites du e-tutorat dans un dispositif de formation hybride
Denis, Brigitte ULiege

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

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

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

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

Conference (2017, July 04)

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

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

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

Conference (2017, July 04)

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

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

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

Conference (2017, July 04)

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

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

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

Conference (2017, July 04)

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See detailBenchmarking the Environmental Impact of Green and Traditional Masonry Wall Constructions
Gauvreau-Lemelin, Corinne; Attia, Shady ULiege

in Brotas, Luisa; Roaf, Susan; Fergus, Nicol (Eds.) Passive low energy architecture design to thrive (2017, July 03)

In Belgium, the most common approach for nearly Zero Energy Buildings is to comply with the locally modified version of the German Passive House (PH) Standard that requires a very low conductivity of ... [more ▼]

In Belgium, the most common approach for nearly Zero Energy Buildings is to comply with the locally modified version of the German Passive House (PH) Standard that requires a very low conductivity of exterior walls. The conventional PH brick constructions are dominated by building materials with high environmental impact including concrete blocks, firebrick and petrochemical insulation materials that produce a great amount of greenhouse gases (GHG). Moreover, there are very few studies that assessed the holistic environmental impact of conventional wall compositions against ecological wall compositions. Therefore, this research compares a traditional Belgian representative wall against a hemp block wall, according to the PH standard. The environmental impact of each wall is quantified through a life cycle assessment. The final results indicate that the hemp wall reinforced with a wood skeleton has a much lower impact on the environment: up to 60% reduction on total primary energy, 72% on climate changes, 93% on eutrophication, 61 % on ozone layer depletion and 74% on acidification. Future work may refine the assessment process. The study provides novel and significant findings that can inform building owners, architects and contractors and encourage them to choose environmentally friendly masonry wall compositions. [less ▲]

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See detailOn the Use of Principal Component Analysis for Parameter Identification and Damage Detection in Structures
Golinval, Jean-Claude ULiege

Conference (2017, July 03)

In this lecture, an approach based on principal component analysis (PCA) is considered for three purposes, namely damage detection, structural health monitoring and identification of nonlinear parameters ... [more ▼]

In this lecture, an approach based on principal component analysis (PCA) is considered for three purposes, namely damage detection, structural health monitoring and identification of nonlinear parameters in structural dynamics. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. The first problem to which PCA is applied here is the damage detection problem. When applied to vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The second problem concerns structural health monitoring of civil engineering structures when environmental effects (e.g. the influence of the variation of the ambient temperature) have to be removed from the structural changes. In this case, PCA may be applied on identified modal features (e.g. the natural frequencies) to separate the changes due to environmental variations from the changes due to damage sources. The third problem is related to the estimation of nonlinear parameters using model updating techniques. In this case, the most interesting property of PCA is that it minimizes the average squared distance between the original signal and its reduced linear representation. When applied to nonlinear problems, PCA gives the optimal approximating linear manifold in the configuration space represented by the data. The linear nature of the method is appealing because the theory of linear operators is still available. However, it should be borne in mind that it also exhibits its major limitation when the data lie on a nonlinear manifold. [less ▲]

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See detailComparative Proteomics Analysis Provides New Candidates for Zinc Homeostasis Regulation in Arabidopsis
Amini, Sahand ULiege; Arsova, Borjana ULiege; Scheepers, Maxime ULiege et al

Poster (2017, July 03)

Zinc (Zn) is an essential micronutrient for plants and around two billion people are depending on grains and legumes as their main Zn source. On the other hand, this transition metal is toxic for plants ... [more ▼]

Zinc (Zn) is an essential micronutrient for plants and around two billion people are depending on grains and legumes as their main Zn source. On the other hand, this transition metal is toxic for plants at high concentrations in soils. This calls for a better unravelling of Zn homeostasis regulation mechanisms, including sensing and signaling in plants. In order to fulfill this aim, we are testing for novel proteins involved in Zn homeostasis in the model plant Arabidopsis thaliana. First, quantitative proteomics was performed on root and shoot samples obtained upon Zn starvation and re-supply in different spatio-temporal conditions. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis was also performed for those treatments to measure the Zn concentration in tissues. It showed very rapid Zn uptake in root upon re-supply. Moreover, quantitative expression studies of known players of Zn homeostasis confirmed our large-scale proteomic results, although for a few genes lack of correlation between transcript and protein regulation was observed. Using clustering, statistical and gene ontology analyses, we selected candidate genes for further studies. Among more than 5000 detected proteins in roots by shotgun proteomics, 75 genes were selected for targeted analyses. In general, our results show that comparative proteomics study can be useful to reveal new players in the Zn regulatory network in plants, which can lead to new Zn biofortification and phytoremediation strategies. [less ▲]

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See detailHow much should you jump? Reproducibility evaluation of a 3-dimensional fatigability countermovement jump test
Paulus, Julien ULiege; Schwartz, Cédric ULiege; Tubez, François ULiege et al

Conference (2017, July 02)

Introduction With the stop jump, the counter movement jump (CMJ) is probably the most used jump in sport. In the literature, a number of studies use the counter movement jump to explore (neuro-)muscular ... [more ▼]

Introduction With the stop jump, the counter movement jump (CMJ) is probably the most used jump in sport. In the literature, a number of studies use the counter movement jump to explore (neuro-)muscular fatigability [1-4]. However, due to the continuous [1-3] (or semi-continuous [4]) character of the test, the CMJ become drop jumps from the second one. Nevertheless, the drop jump isn't the most frequent jump type in sport. These evaluations, with (semi-)continuous jumps, don't reflect the sport reality and therefore a more effective (neuro-)muscular jumping fatigability evaluation must be validated. Methods Nineteen volleyball players (23,5 ± 3,3 years, 187,6 ± 6,6 cm, 77,5 ± 8,5 kg), with no history of (major) lower limb injury, submitted to two jumping fatigability tests, with seven days between each session, under the direction of a single researcher. The jumping fatigability tests consists of the repetition of 50 maximal CMJ at the rate of 33bpm. Between each CMJ, the subject were asked to make a full triple-extension and to wait the next auditory and visual signal of the metronome to start the hip-knee-ankle flexion. With these instructions, each jump remains a CMJ. Subjects were asked to leap as high as possible from the first to the last CMJ. The jumping height was recorder for each jump with three dimensional camera. The reproducibility was assessed by Standard Error of Measurement (SEM), Minimal Difference needed to be considered real (MD), Coefficient of Variation (CV), Pearson Correlation Coefficient (PCC) with 95% confidence interval, Effect Size Cohen (ES Cohen) with 90% confidence interval, paired Student's t-test, Intraclass Correlation Coefficient (ICC 2,1) with 95% confidence interval and Magnitude-Based Inferences (MBI). Results The results summary is available in the Table 1. In this table, only few parameters are presented and only for the partial sums of the first 10, 20, 25, 30, 40 and 50 jumps. Our analyses were based on the partial sums per interval of one jump and all statistical tests listed in "Methods" section have been considered. The partial sum with twenty-five CMJ have an excellent reproducibility (MBI with 0/99/1; ICC with 0.961 [0.902/0.985]; ES Cohen with -0.03 [-0.17/0.10]; PCC with 0.966 [0.911/0,987] and p-value < 0.0001). Moreover, it induce a great height decrease (-23%) and its duration (45.5 s) is similar to the recommendation for the knee fatigability isokinetic protocol [5]. MBI (+/trivial/-) Height decrease ICC (2,1) Test duration 10 0/100/0 -12,7% 0.967 18 s 20 0/99/1 -19,0% 0.964 36 s 25 0/99/1 -23,0% 0.961 46 s 30 0/98/1 -25,6% 0.955 55 s 40 0/98/1 -32,1% 0.950 73 s 50 0/98/2 -38,4% 0.943 91 s Table 1: reproducibility statistics results depending on the number of jumps considered (magnitude-based inferences (MBI) with percentage chances of better/trivial/worst retest vs test results; height jump decrease (last jump / better jump); ICC (2,1); test duration). Discussion Because of the (semi-)continuous character of a majority of fatigability jumping test [1-4], our test is the first, at our knowledge, to explore the reproducibility of a strict CMJ jumping fatigability task. Considering the statistical (relative and absolute) reproducibility results, twenty-five maximal CMJ seems to be the best compromise between reliability of the data and physiological interpretability of test's results. Indeed, its (relative and absolute) reproducibility is excellent and it induces a greater height decrease than shorter test while remaining similar in total duration than other fatigability tests which explore the anaerobic lactic system. References 1. Bosco et al, Eur J Appl Physiol Occup Physiol, 51(3):357-364, 1983. 2. Cormack et al., Int J Sports Physiol Perform, 3(2):131-44, 2008. 3. Dal Pupo et al., J Sci Med Sport, 17(6):650-5, 2014. 4. Meckel et al., J Strength Cond Res, 29(8):2122-7, 2015. 5. Bosquet et al., Int J Sports Med, 31(2):82-8, 2010. [less ▲]

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See detailSimultaneous Determination of Free Amino Acid Content in Different Teas using Supercritical Fluid Chromatography Coupled with Single Quadrupole Mass Spectrometry
Huang, Yang ULiege; Fillet, Marianne ULiege; Crommen, Jacques ULiege et al

Poster (2017, July 02)

Tea (Camellia sinensis L.) is a complex mixture containing a wide range of biological activities and has been used as widely consumed beverages and natural medicine for over thousand years [1-2]. In this ... [more ▼]

Tea (Camellia sinensis L.) is a complex mixture containing a wide range of biological activities and has been used as widely consumed beverages and natural medicine for over thousand years [1-2]. In this study, a novel method for high-performance liquid chromatography with mass spectrometry (SFC-MS) has been developed to simultaneously determine the contents of 11 free amino acids in different types of teas (pu-erh tea, green tea, black tea and oolong tea). The separation conditions for the selected amino acids were carefully optimized such as the column type, temperature and backpressure, the type of additive. The best compromise for tested analytes in terms of chromatographic performance was obtained when water (5%) and trifluoroacetate acid (0.4%) were added to the supercritical carbon dioxide/methanol mobile phase. Finally, the developed SFC-MS method was successfully applied to the analysis of the 11 amino acids present in the teas and fully validated as well. The results indicated a good linearity (r ≥0.995), precision (RSD≤ 2.99%), stability (RSD≤ 2.88%) and accuracy (91.95%~107.99%). The limits of detection ranged from 1.42 to 14.69 ng/mL, respectively, while the limits of quantification were between 4.53 and 47.0 ng/mL. The content of the amino acids in six different tea samples were also determined and presented some difference basing on the fermentation processes. The proposed SFC-MS method showed a great potential in further investigations to differentiate tea varieties [less ▲]

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See detailTesting the discrimination hypothesis for female self employment migrants in the UK
Constantinidis, Christina ULiege; Fletcher, Denise; Joxhe, Majlinda

in IAFFE (Ed.) Books of Abstracts (2017, July 01)

We propose a comparative analysis of migrants in both sectors (employment and self-employment) exploring the gender earning discrimination hypothesis. Using individual micro data from the British ... [more ▼]

We propose a comparative analysis of migrants in both sectors (employment and self-employment) exploring the gender earning discrimination hypothesis. Using individual micro data from the British Household Panel Survey (1991-2008), we estimate wage equations for employed and self-employed migrants and find that, contrary to our expectations, the average earnings gap in self-employment is almost double compared to the employment sector. This finding reveals that self-employment leads migrant women to an even more precarious and vulnerable position in terms of financial means and economic power. In addition, we explore the determinants of these gaps using the econometric procedure of the decomposition (the Blinder-Oaxaca) model. We find that the variables that explain the gender gap in the employment sector are mostly observable individual characteristics like education or migration duration, confirming the human capital theory, whereas in the self-employment sector, this gap is more due to unobservable individual characteristics. Through our work, we show that including the gender perspective into migration analysis has implications for policy makers enabling them to evaluate these processes from a more social (rather than individualistic) dimension. [less ▲]

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See detailEarly detection of university students with potential difficulties
Hoffait, Anne-Sophie ULiege; Schyns, Michael ULiege

Conference (2017, July)

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. We aim at early detection of ... [more ▼]

Using data mining methods, this paper presents a new means of identifying freshmen's profiles likely to face major difficulties to complete their first academic year. We aim at early detection of potential failure using student data available at registration, i.e. school records and environmental factors, with a view to timely and efficient remediation and/or study reorientation. We adapt three data mining methods, namely random forest, logistic regression and artificial neural network algorithms. We design algorithms to increase the accuracy of the prediction when some classes are of major interest. These algorithms are context independent and can be used in different fields. They rely on a dynamic split of the observations into subclasses during the training process, so as to maximize an accuracy criterion. Four classes are so built: high risk of failure, risk of failure, expected success or high probability of success. Real data pertaining to undergraduates at the University of Liège (Belgium), illustrates our methodology. With our approach, we are now able to identify with a high rate of confidence (90%) a subset of 12.2% of students facing a very high risk of failure, almost the quadruple of those identified with a non-dynamic approach. By testing some confidence levels, our approach makes it possible to rank the students by levels of risk and a sensitivity analysis allows us to find out why some students are likely to encounter difficulties. [less ▲]

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See detailAggregation of flexible domestic heat pumps for the provision of reserve in power systems
Georges, Emeline ULiege; Quoilin, Sylvain ULiege; Mathieu, Sébastien ULiege et al

in Proceedings of the 30th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems. (2017, July)

The integration of renewable energy sources in the electricity production mix has an important impact on the management of the electricity grid, due to their intermittency. In particular, there is a ... [more ▼]

The integration of renewable energy sources in the electricity production mix has an important impact on the management of the electricity grid, due to their intermittency. In particular, there is a rising need for flexibility, both on the supply and demand sides. This paper assesses the amount of flexibility that could be reserved from a set of flexible residential heat pumps in a given geographical area. It addresses the problem of a load aggregator controlling a set of heat pumps used to provide both space-heating and domestic hot water. The flexibility of the heat pumps is unlocked in order to reduce electricity procurement costs in the day-ahead electricity market, while ensuring the provision of a predefined amount of reserve for real-time grid management. The objective of the paper is two-fold. On the one hand, an aggregation method of large sets of heat pumps based on physics-based models and random sampling techniques is proposed. On the other hand, a combined optimization problem is formulated to determine both the optimal electricity demand profile to be bought on the day-ahead market and the cost associated to the reservation of a defined amount of power. The method is applied to a set of 40000 residential heat pumps in Belgian houses. Results show that these houses can provide up to 100MW of upward reserve for 50% of the current costs. The provision of downward reserve at competitive cost is hampered by significant overconsumption. [less ▲]

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See detailN2O production and cycling within Antarctic sea ice
Kotovitch, Marie ULiege; Tison, J.-L.; Fripiat, François ULiege et al

Poster (2017, July)

Nitrous oxide (N2O) is a potent greenhouse gas that has a lifetime of 114 years in the atmosphere and a global warming potential 300 time higher than that of CO2. However there are still large ... [more ▼]

Nitrous oxide (N2O) is a potent greenhouse gas that has a lifetime of 114 years in the atmosphere and a global warming potential 300 time higher than that of CO2. However there are still large uncertainties and gaps in the understanding of the N2O cycle in polar oceans and particularly associated to sea ice. Sources and sinks of N2O are therefore poorly quantified. To date, only one study by Randall et al. 2012 present N2O measurements in sea ice. They pointed out that sea ice formation and melt has the potential to generate sea-air or air-sea fluxes of N2O, respectively. The main processes (except the transport processes) involved in the N2O cycle within the aquatic environment are nitrification and denitrification. Recent observations of significant nitrification in Antarctic sea ice shed a new light on nitrogen cycle within sea ice. It has been suggested that nitrification supplies up to 70% of nitrate assimilated within Antarctic spring sea ice. Corollary, production of N2O, a by-product of nitrification, can potentially be significant. Our recent studies in Antarctic land fast ice in McMurdo Sound, confirmed this suggestion, where N2O release to the atmosphere was estimated to reach 4µmol.m-2.yr-1. But this assessment is probably an underestimation since it only accounts for dissolved N2O while a significant amount of N2O is likely to occur in the gaseous form like N2, O2 and Ar. We will then address the new tools to measure the bulk concentration of N2O (dissolved and gaseous) in sea ice, and the production of N2O by sympagic microorganisms - what process is dominant and how much N2O is produced - based on the first time series of N2O measurement in sea ice. The determination of the isotopic composition of N2O using cavity enhanced laser absorption spectroscopy technique (Off-axis ICOS) will allow us to determine the origin of these processes. [less ▲]

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See detailCANINE GANGRENOUS MASTITIS : A CASE REPORT
Egyptien, Sophie ULiege; Lefebvre, Michaël ULiege; Guieu, Liz-Valéry ULiege et al

Poster (2017, July)

This report describes the treatments and discusses the cost effectiveness of a Negative Pressure Wound Therapy (NPWT) device on a gangrenous mastitis case. Mastitis is an inflammation of the mammary gland ... [more ▼]

This report describes the treatments and discusses the cost effectiveness of a Negative Pressure Wound Therapy (NPWT) device on a gangrenous mastitis case. Mastitis is an inflammation of the mammary gland found mainly in lactating females. Coliforms (Escherichia coli), Staphylococcus spp (Staphylococcus aureus) and, to a lesser extent, Streptococcus spp are the most commonly isolated organisms in bitches. The bitch can be presented because of local signs of inflammation, puppies failing to thrive or even severe septic shock. While more common in ruminants, gangrenous mastitis is rare in the bitch. It is mostly due to Staphylococcus aureus, a gram positive and catalase positive bacteria producing alpha hemolysin. This toxin binds to ADAM10, a transmembrane protein, forming pores in the cell membrane, causing an acute inflammation via intracellular calcium flow, leading to severe oedema, necrosis and gangrene. Loss of skin integrity also comes from the cleavage of E-cadherin by ADAM10 after its toxin-mediated activation. A 8.7kg, 3-year-old neutered female Sheltie farm dog was referred to the Veterinary Clinic of the University of Liège for suspicion of septic peritonitis after an ovariohysterectomy on 4 dead puppies 36 hours earlier. They died during long lasting dystocia. Amoxicillin-acid clavulanic and enrofloxacin antibiotherapy had been initiated during surgery. The dog was in decompensated septic shock. The surgical wound was not reactive and no sign of peritonitis was seen by abdominal ultrasonography. The right inguinal and the two most caudal left mammary glands were swollen, crackling with a patchy blue discoloration. An acute fulminant mastitis with gangrenous involvement and sepsis was diagnosed. Fluids and continuous rate infusion of norepinephrine and dobutamine were administered to control severe hypotension. Metronidazole was added since Clostridium spp could not be excluded. Debridement was started as soon as the arterial pressure was stabilised and the wound was disinfected with hydrogen peroxyde for the 3 first days. While hydrogen peroxyde is indicated for catalase negative infections, the already started antibiotherapy prevented bacterial identification and sensitivity determination. Alginate-honey patches replaced wet to dry bandages after 4 days. After 7 days of progressive debridement, the wound was 15cm long, 13cm wide and 1.2cm deep. A NPWT device was placed under anaesthesia after extensive debridement. It was kept in place for one week with one renewal after 2 days under slight sedation. The wound was then surgically closed. Cutaneous sutures were removed 10 days later as cicatrization was satisfactory. NPWT is indicated in open wound management, for infection control and for stimulating granulation tissue production prior to reconstruction. It increases contraction in deep, three dimensional wounds. Closure rate is significantly shorter with NPWT than with standard wet to dry bandages. Cost of NPWT is comparable to standard bandages but more comfortable for the patient. Standards bandages require daily changes, sometimes for several weeks and under repeated anaesthesias, which may be debilitating for the patient and expensive for the owner. Conversely, NPWT is changed only once and allows earlier surgical closure of the wound. The main complication is vacuum loss, which is surgeon’s experience dependant. [less ▲]

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See detailPractical Trajectories of Parametric Tools in Small and Medium Architectural Firms
Stals, Adeline ULiege; Elsen, Catherine ULiege; Jancart, Sylvie ULiege

in Future trajectories for computation in design (2017, July)

Initially used as an extension of hand-drawing tools, digital design tools and moreover parametric ones are nowadays deeply modifying the architectural design process. Big offices with star-architects ... [more ▼]

Initially used as an extension of hand-drawing tools, digital design tools and moreover parametric ones are nowadays deeply modifying the architectural design process. Big offices with star-architects were able to adopt these tools but most architects working in a small office are still trying to cope with these parametric design tools. Several questions arise in this regard: what digital tools do architects usually use? Do they express interest for new technologies and software such as parametric ones? What is their understanding of the term “parametric architecture”? Why is this kind of tools still not largely adopted? Going through the results of an online survey, this paper first discusses the meaning of parametric design for architects. The contribution then analyzes the Belgian case regrouping mostly small and medium offices. It reflects particularly on the way architects do or do not implement these new digital tools in their workflows, and it sheds light on the fact that parametric tools also have the potential to free the creativity of SME’s. [less ▲]

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See detailThe grammaticalization of Russian taxonomic nouns
Kolyaseva, Alena ULiege

Conference (2017, July)

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See detailWEATHERING ON THE DEVONIAN SLATES AND CHARACTERIZATION OF A BENTONITE LAYER IN THE WESTERWALD (GERMANY)
Fontaine, François ULiege; Hamaekers, Helen; Hoffmann, Andreas et al

Conference (2017, July)

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of ... [more ▼]

The Westerwald region is one of the largest and oldest clay mining areas of Germany. Those deposits were formed during the Eocene and Oligocene as a result of the weathering, erosion and redeposition of Devonian rocks. During the Miocene, intense volcanic activities led to a large basalt cover, protecting the clays from the erosion. The two main goals of this study are first to improve the knowledge on the weathering processes of the Devonian slates that led to the current setting of those clay deposits by studying the mineralogical and chemical composition of the clays with depth. The second goal is to characterize a bentonite layer underneath the Miocene basalt cover using quantitative X-ray diffraction, chemical analysis, BET, cation exchange capacity and scanning electron microscope. A 20 meter deep quarry mining the Devonian bedrock in southern Westerwald has been sampled on its entire depth. The XRD results show no significant variations of the mineralogy with depth, except for the phyllosilicates. The minerals of the < 2 μm fraction are illite, kaolinite, smectite and mixed-layers minerals (vermiculite-chlorite and illite-chlorite). The proportions of the minerals in the mixed-layers chlorite-vermiculite vary with depth. At the bottom of the quarry, the proportion of vermiculite is very low while in the top, the proportion of vermiculite is higher. This is explained by the degree of the weathering, logically more intense at the top of the quarry. Trace elements compositions are currently being investigated. A 3 meter thick greenish to brownish bentonite layer has been found in the eastern part of the Westerwald region. The XRD performed on different samples of this bentonite shows a relatively heterogeneous composition: montmorillonite (60-80%), kaolinite (5-12%), illite (0-7%), goethite (2-15%), talc (0-10%), K-feldspars (0-7%), plagioclase (0-4%) and traces of amphibole and pyroxene. This bentonite is probably the result of the weathering of volcanic ashes. Since there are not many outcrops of this bentonite layer, its spatial distribution is studied by drilling. [less ▲]

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See detailGood practices in adapted physical activity for cancer patients and survivors: opinion of the Raviva program participants
Rompen, Jérôme ULiege; Scharff, Jules; Cloes, Marc ULiege

Conference (2017, July)

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir ... [more ▼]

Introduction The Belgian Foundation against Cancer proposes an adapted physical activity (APA) program for cancer patients and survivors, called Raviva (http://www.cancer.be/raviva-bouger-pour-se-sentir-mieux).The activities are supervised by instructors with inconstant trainings and experiences. Contrary to other countries, Belgian APA instructors do not necessarily need to follow specific education programs such those proposed by the ACSM (Schmitz et al., 2010) or other organizations that propose exercise guidelines for cancer survivors. The aim of this study was to identify good practices in APA for cancer patients and survivors concerning activity characteristics and instructors behaviors, from the point of view of the Raviva program participants. Methods Firstly, an online questionnaire was submitted to Raviva participants; 72 of them filled it in. Secondly, 3 video-stimulated recall interviews were conducted after 3 different Raviva sessions (fitness, yoga and aqua-aerobics), each time with another participant. Results and discussion The sessions characteristics that participants like the most are related to the choice and quality of the proposed exercises (22% of responses) and to the perceived benefits of the activities (20%). The most appreciated qualities for an instructor are related to his/her human qualities (43%) and his/her expertise (32%). What participants like least about the sessions is a poor organization (27%) and what they like least about the instructors is linked to bad choices of exercises (18%). The video-stimulated recall interviews confirmed these data and provided more precision. Finally, we noticed that differences in responses were observed depending on the type of activity participants took part in. These findings could help instructors adapt their practices to their participants’ needs in order to promote adherence to physical activity among this population. References Schmitz, K. H., Courneya, K. S., Matthews, C., Demark-Wahnefried, W., Galvão, D. a, Pinto, B. M., … Schwartz, A. L. (2010). American College of Sports Medicine roundtable on exercise guidelines for cancer survivors. Medicine and Science in Sports and Exercise, 42(7), 1409‑26. https://doi.org/10.1249/MSS.0b013e3181e0c112 [less ▲]

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See detailReinforcement Learning for Electric Power System Decision and Control: Past Considerations and Perspectives
Glavic, Mevludin ULiege; Fonteneau, Raphaël ULiege; Ernst, Damien ULiege

in The 20th World Congress of the International Federation of Automatic Control, Toulouse 9-14 July 2017 (2017, July)

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are ... [more ▼]

In this paper, we review past (including very recent) research considerations in using reinforcement learning (RL) to solve electric power system decision and control problems. The RL considerations are reviewed in terms of speci c electric power system problems, type of control and RL method used. We also provide observations about past considerations based on a comprehensive review of available publications. The review reveals the RL is considered as viable solutions to many decision and control problems across di erent time scales and electric power system states. Furthermore, we analyse the perspectives of RL approaches in light of the emergence of new-generation, communications, and instrumentation technologies currently in use, or available for future use, in power systems. The perspectives are also analysed in terms of recent breakthroughs in RL algorithms (Safe RL, Deep RL and path integral control for RL) and other, not previously considered, problems for RL considerations (most notably restorative, emergency controls together with so-called system integrity protection schemes, fusion with existing robust controls, and combining preventive and emergency control). [less ▲]

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See detailÉvaluation de la capacité du Modèle Atmosphérique Régional (MAR) à simuler la saison des pluies en Afrique Intertropicale
Doutreloup, Sébastien ULiege; Wyard, Coraline ULiege; Belleflamme, Alexandre ULiege et al

in Dahech, Salem; Charfi, Sami (Eds.) Actes du XXXe colloque de l'Association Internationale de Climatologie : CLIMAT, VILLE ET ENVIRONNEMENT (2017, July)

In Intertropical Africa, climate is essentially characterized by the amount of precipitation and its annual regime. These precipitations and their evolution during the period 1970-1999 are simulated ... [more ▼]

In Intertropical Africa, climate is essentially characterized by the amount of precipitation and its annual regime. These precipitations and their evolution during the period 1970-1999 are simulated thanks to the Regional Atmospheric Model (MAR), developed at the ULg, and forced by the NCEP1 reanalyses and by the outputs of three global models (GCM) of the CMIP5 database. These MAR simulations are compared to the gridded data of the Climate Research Unit (CRU). It is clear from our investigations that the simulation of the MAR model forced by the NCEP1 reanalyses is better reproducing the quantities as well as the annual rainfall regime in the semi-arid regions than in equatorial regions. On the other hand, simulations of the MAR forced by the outputs of the GCMs are globally unsatisfactory throughout the intertropical domain in terms of quantities as well as the seasonality of precipitation. [less ▲]

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See detailHydro-mechanical modelling of a coalbed methane production well via a dual-porosity approach
Bertrand, François ULiege; Buzzi, Olivier; Collin, Frédéric ULiege

in Book of Abstracts: 6th International Conference on Coupled THMC Processes in Geosystems (2017, July)

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See detailCymastrobus irvingii gen. et sp. nov., a new isotalean cone from the Late Devonian locality of Barraba, NSW Australia
Evreïnoff, M.; Meyer-Berthaud, B.; Decombeix, A.-L. et al

Conference (2017, July)

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See detailMonitoring of comets activity and composition with the TRAPPIST-North telescope
Moulane, Youssef ULiege; Benkhaldoun, Zouhair; Jehin, Emmanuel ULiege et al

in Journal of Physics: Conference Series (2017, July), 869

TRAPPIST-North (TRAnsiting Planets and PlanetesImals Small Telescope) is a 60-cm robotic telescope that was installed in May 2016 at the Oukaimeden Observatory. The project is led by the University of ... [more ▼]

TRAPPIST-North (TRAnsiting Planets and PlanetesImals Small Telescope) is a 60-cm robotic telescope that was installed in May 2016 at the Oukaimeden Observatory. The project is led by the University of Liège (Belgium) and the Caddi Ayad University of Marrakech (Morocco). This telescope is a twin of the TRAPPIST-South telescope, which was installed at the ESO La Silla Observatory in 2010. The TRAPPIST telescopes are dedicated to the detection and characterization of planets orbiting stars other than our Sun (exoplanets) and the study of comets and other small bodies in our solar system. For the comets research, these telescopes have very sensitive CCD cameras with complete sets of narrow band filters to measure the production rates of several gases (OH, NH, CN, C3 and C2) and the dust. With TRAPPIST-North we can also observe comets that would not be visible in the southern hemisphere. Therfore, with these two telescopes, we can now observe continuously the comets around their orbit. We project to study individually the evolution of the activity, chemical composition, dust properties, and coma morphology of several comets per year and of different origins (New comets and Jupiter Family comets) over a wide range of heliocentric distances, and on both sides of perihelion. We measure the production rates of each daughter molecules using a Haser model, in addition to the Afρ parameter to estimate the dust production in the coma. In this work, we present the first measurements of the production rates of comet C/2013 X1 (PANSTARRS) observed with TN in June 2016, and the measurements of comet C/2013 V5 (Oukaimeden) observed in 2014 with TRAPPIST-South. [less ▲]

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See detailLanguage abilities in preterm-born children : Specific difficulties in phonological skills
Desmottes, Lise ULiege; Maillart, Christelle ULiege; VIELLEVOYE, Renaud ULiege et al

Poster (2017, July)

Children who were born prematurely (before 37 weeks’ gestation) are at greater risk for a range of impairments in cognitive, motor, social-emotional, and academic functioning (e.g., Bos et al., 2013 ... [more ▼]

Children who were born prematurely (before 37 weeks’ gestation) are at greater risk for a range of impairments in cognitive, motor, social-emotional, and academic functioning (e.g., Bos et al., 2013). Other developmental disorders, such as language delays and deficits, are also more common in preterm children (Van Noort et al., 2012). Because language function is essential in all kinds of social and academic life (Young et al., 2002), it is crucial to better identify and characterize language impairment in preterm-born children. Despite the large amount of research conducted on language abilities in preterm children, little is known about their phonological development (Barre et al., 2011). In the present study, we investigated differences in several phonological tasks between French-speaking premature children and in term-born control children. 30 children born at <35 weeks’ gestation (4 to 5 years old) and with low-birth weight (1215 g on mean) were recruited. These preterm children were matched to 30 children born at term on gender, chronological age and socio-economic level. All participants were administered five language tasks (phonemic discrimination, phonological judgment, pictures naming, pseudo-words repetition and phonological awareness) in order to precisely assess their phonological skills. Results indicated that preterm children presented poorer performance than control term-born children when they had to discriminate between different phonemes (phonemic discrimination abilities), to detect phonemic modifications (phonological judgment) and to recognize and identify syllabic segments (phonological awareness). Differences between both groups have also been observed in the quality of phonological representations (pictures naming task). However, both groups of children performed equally well in the pseudo-words repetition task. These findings revealed that preterm children score significantly lower compared with term-born children on several phonological tests, a language subdomain which is particularly important in the initial stages of language development and for reading. [less ▲]

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See detailDispersion of Myzus persicae and transmission of Potato Virus Y under elevated CO2 atmosphere
Bosquée, Emilie ULiege; Boullis, Antoine ULiege; Bertaux, Morgane et al

Poster (2017, July)

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See detailDevelopment of an Ericsson Heat Engine for biomass Combined Heat and Power
Oudkerk, Jean-François ULiege; Lemort, Vincent ULiege

in Proceedings of the 30th International conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS) (2017, July)

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See detailImpact of endophytic entomopathogenic fungus on plant attractivity in aphid-virus-plant interactions
Fingu Mabola, Junior Corneille ULiege; Bosquée, Emilie ULiege; Boullis, Antoine ULiege et al

Poster (2017, July)

Endophytic entomopathogenic fungi (EEPF) are biological control agents able to live in their host plants in a symbiotic interaction and secrete secondary metabolites in the host plant tissues interacting ... [more ▼]

Endophytic entomopathogenic fungi (EEPF) are biological control agents able to live in their host plants in a symbiotic interaction and secrete secondary metabolites in the host plant tissues interacting with pests and phytopathogenic agents like plants virus. This is the case of Barley yellow dwarf virus (BYDV) transmitted by the Bird cherry oat aphid (Rhopalosiphum padi Linnaeus) and the Grain aphid (Sitobion avenae Fabricius). This virus is one of the most economically important phytoviruses affecting major world cereal crops such as wheat, rice and corn, causing significant yield losses. In this study, we investigated the influence of EEPF presence in the plant tissues on the vector’s orientation preference by considering the insect virus-infection status. We performed a choice test in Petri dishes and collection of volatile compounds emitted by plants. The impact of these interactions between plant-fungi-virus is finally discussed. [less ▲]

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See detailRepresentations about physical activity among firefighters. A study in Wallonie
Dubru, Gilles ULiege; Gribomont, Antoine; Cloes, Marc ULiege

Poster (2017, July)

Introduction To be a firefighter is a dangerous job. Many authors have found anxiety, stress, depression, sleep disorders, absenteeism and other deviant behaviors in this type of high-risk occupation ... [more ▼]

Introduction To be a firefighter is a dangerous job. Many authors have found anxiety, stress, depression, sleep disorders, absenteeism and other deviant behaviors in this type of high-risk occupation (Fullerton, Ursano & Wang, 2004 ; Carey, Al-Zaiti, Dean, Sessanna & Finnell, 2011 ; Elliot & Kuehl, 2007). Adopting an active lifestyle is therefore very important in reducing these health risks and thus maximizing the chances of staying healthy. It is for this reason that physical activity has an essential role for these people. According to this determining the place occupied by physical activity within the regional Walloon fire servicesseemed relevant. The first step should be to analyse the firefighters’ representations and lifestyle. Methods An online questionnaire (SurveyMonkey) was developed. It proposed a majority of closed-ended questions facing on age (38 ± 10.4 years), BMI (26.1 ± 3.7), gender (96.7% of men), rank, status (38.3% professional), PA representations and practices, well-being and self-esteem, job satisfaction, … We contacted one of the main firefighters association (FRCSPB) to reach a significant number of topics. 443 questionnaires were collected during a five weeks period. 394 were usable. 376 responses were needed to achieve a 95% confidence level with a 5% confidence interval based on all Belgian Firefighter. Results and discussion Results showed that firefighter showed positive representations about PA and were aware of the benefits of a regular practice on their health. Good stress management and cardiovascular endurance qualities were considerate as important in this profession. Nevertheless, subjects deplored a lack of maintenance of these qualities. The mean BMI of the subjects was above 26, indicating a slight overweight. Sedentary lifestyle, poor infrastructure, injuries due to lack of fitness allow us to suspect an insufficient training. Other factors were pointed out by the subjects (stress, absenteeism, deviant behavior…). Firefighters were generally satisfied with their job and considered that they have an acceptable quality of life. However lack of time, financial and human resources must not be a barrier to the practice of essential PA for those people who are directly related with danger. References Carey, M. G., Al-Zaiti, S. S., Dean, G. E., Sessanna, L., & Finnell, D. S. (2011). Sleep problems, depression, substance use, social bonding, and quality of live in professional firefighters. The international journal of occupational and environmental medicine, 53(8), 928-933. Doi: 10.1097/JOM.0b013e318225898f. Elliot, D. L., & Kuehl, K.S. (2007). The effects of sleep deprivation on firefighters and EMS responders: final report. International Association of fire Chiefs. Fullerton, C. S., Ursano, R.J.,& Wang, L. (2004). Acute stress disorder, posttraumatic stress disorder, and depression in disaster or rescue workers. The American Journal of Psychiatry, 161(8), 1370-76. [less ▲]

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See detailStable isotopes reveal effects of environmental changes on ecological niches of Iphimediidae amphipods
Michel, Loïc ULiege; d'Udekem d'Acoz, Cédric; Frederich, Bruno ULiege et al

Poster (2017, July)

When faced with environmental changes, organisms are expected to have some intrinsic ability to adapt through ecological plasticity. However, this process is still poorly understood in many Antarctic ... [more ▼]

When faced with environmental changes, organisms are expected to have some intrinsic ability to adapt through ecological plasticity. However, this process is still poorly understood in many Antarctic invertebrates. Here, we focused on Iphimediidae amphipods, as this widely distributed family shows important ecological diversity. In total, 248 amphipods (19 species) from two widely different zones (the West Antarctic Peninsula, or WAP, and Adélie Land, AL) were studied to elucidate how environment can influence ecological niche parameters. Ecological niches were explored using stable isotope ratios of carbon and nitrogen and the SIBER approach (Jackson et al., 2011). The isotopic niche of the whole amphipod assemblage was wider in WAP than in AL. This was true for both total (proxy of the whole range of resources exploited by animals) and the core (proxy of the most commonly used resources) isotopic niches. The ratio between total and core isotopic niches was smaller in WAP than in AL (4.13 vs. 5.74), suggesting that in WAP, animals commonly use a greater relative percentage of the resources to which they have access. Niche modelling at the specific level revealed that this trend was not found in all taxa. For example, niches of Gnathiphimedia sexdentata and Iphimediella microdentata were bigger in WAP than in AL, following the general pattern. On the other hand, niches of Echiniphimedia echinata and E. hodgsoni had the same width in both areas. Moreover, relative niche overlap between these two species was much higher in WAP (42%) than in AL (20%). Our results indicate that the widely different environmental conditions encountered by the animals in these two zones clearly influence their ecology. Overall, Iphimediidae amphipods tend to exploit more resources in WAP, i.e. in the zone where impacts of global change (temperature increase, sea ice cover decrease) are the strongest. Niche overlap between some closely related (i.e. congeneric) species was also more important in WAP. Ultimately, environmental changes in this region might reinforce these trends, which might lead to competition and perturb amphipod community structure. This research was funded by the Belgian Federal Science Policy Office (BELSPO) in the framework of the vERSO and RECTO projects. [less ▲]

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See detailLight Induced Super-Hydrophilicity in Niobium and Tantalum Oxides Thin Films
Henry, Théo ULiege; Bonsague, Fabio; Dubreuil, Olivier ULiege et al

Poster (2017, July)

Since its discovery at the end of the nineties by Wang et al.,[1] the interest for light-induced superhydrophilicity is ever growing. The application fields for materials displaying such a property are ... [more ▼]

Since its discovery at the end of the nineties by Wang et al.,[1] the interest for light-induced superhydrophilicity is ever growing. The application fields for materials displaying such a property are wide and numerous:[2] self-cleaning surfaces, anti-fogging, anti-bacterial, water and air purification, microfluidics…Nowadays, a research emphasis is on relatively low energy bandgap semiconductors, targeting a higher efficiency under solar irradiation or more precisely in the near UV and low-end of the visible spectral range. Here, however, we report UV-induced superhydrophilicity in metal oxides thin films showing a relatively high transparency in the UV. Reactive ion beam sputtering (IBS) was used to deposit niobium, tantalum and titanium oxides thin films with thickness ranging from 10 nm to 120 nm on fused silica substrates at room temperature. Contact angle measurements were performed for progressively increasing UV doses and also as function of elapsed time after the termination of the exposure in order to investigate the UV-induced hydrophilicity and recovery behavior of tantalum and niobium oxide thin films in comparison to that of titanium oxide deposited in analogous conditions. [less ▲]

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See detailImpact of Diesel generator limitations in the robust sizing of isolated hybrid Microgrids including PV and batteries
Balderrama Subieta, Sergio Luis ULiege; Canedo, Walter; Lemort, Vincent ULiege et al

in Proceedings of ECOS 2016 - the 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (2017, July)

The recent developments in PV and Lion-ion batteries along with the maturity of gensets technology to provide energy to isolated systems has fostered the use of hybrid micro-grids for rural ... [more ▼]

The recent developments in PV and Lion-ion batteries along with the maturity of gensets technology to provide energy to isolated systems has fostered the use of hybrid micro-grids for rural electrification. In this context, the optimal coupling of different technologies and the minimization of the cost to the final consumer are the objects of a number of previous researches. However, the approach usually relies on deterministic linear programming optimizations (LP), which do not allow to model certain non-linearities and limitations of the components. This paper aims at filling this gap by proposing an optimization of such system, with a detailed representation of each component. The case study of an isolated village (Las Misiones, Bolivia) with a peak electricity consumption of 9.2 MW is analyzed. The considered system comprises a diesel generator; a PV array and Li-Ion batteries whose nominal capacities should be optimized. A robust optimization tool is first proposed with an LP formulation and the net present cost as objective function. The basic model is then modified to take into account more complex operating characteristics of a gen-set operating in part-load. To that aim, the LP problem is changed into a mixed integer linear programing formulation. Results indicate that the more detailed constraints influence the final design of the system and negatively impact the total cost. [less ▲]

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See detailBeta Cell Regeneration in Zebrafish : Investigating the Ductal Contribution
Bergemann, David ULiege; Massoz, Laura; Bourdouxhe, Jordane ULiege et al

Poster (2017, July)

Diabetes is characterized by the loss of insulin producing beta cells. Although different therapeutic strategies do exist, they lack precise and dynamic control of glycemia as carried out by endogenous ... [more ▼]

Diabetes is characterized by the loss of insulin producing beta cells. Although different therapeutic strategies do exist, they lack precise and dynamic control of glycemia as carried out by endogenous beta cells. One promising alternative is to replenish the pancreas with bona fide functional beta cells by triggering regeneration mechanisms. Previous studies have shown beta cell neogenesis originating from different pancreatic cell types (alpha, delta, acinar and ductal cells), depending on the used model. The ductal origin is supported by the fact that the embryonic duct epithelium gives rise to the endocrine lineage, and that in healthy and diabetic human adults, insulin positive cells could be found next to or in pancreatic ducts. Despite these observations, mammals show very limited regenerative capabilities, making it difficult to investigate those mechanisms. In contrast, zebrafish are extensively used for regeneration studies. The ability of adult zebrafish to regenerate its beta cells and restore normoglycemia after massive beta cell ablation has already been shown. We, and other groups, have previously shown that adult pancreatic duct cells act as progenitors, giving rise to beta cells in physiological and induced diabetic condition in vivo. To get insight into this process, we conducted comparative RNA-seq experiments on pancreatic duct cells from adult zebrafish. By this means, we identified regulated gene expression that can be linked to specific processes/pathways such as cell cycling and Notch. In order to confirm the involvement of identified candidate genes/pathways, we are setting up a screening method using chemical activators and inhibitors in old larvae, by looking at their ability to modify proliferation/differentiation of duct cells after beta cell ablation. In addition, we are also investigating the effect of mutations, generated by the CRISPR/Cas9 system within candidate genes, on the regeneration capabilities. Together, these strategies should provide new clues about regenerative processes triggered in duct cells that might be applied to overcome the poor regenerative capabilities of mammals. [less ▲]

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See detailAn overview of the quality of interactions in Belgian pre-kindergarten classrooms
Leroy, Sandrine ULiege; Desmottes, Lise ULiege; Bergeron-Morin, Lisandre ULiege et al

Poster (2017, July)

Quality of teacher-children interactions during early childhood plays a protective effect on language development, more particularly with the more vulnerable children (Dickinson, 2011). However, the ... [more ▼]

Quality of teacher-children interactions during early childhood plays a protective effect on language development, more particularly with the more vulnerable children (Dickinson, 2011). However, the quality of these interactions, especially those supporting language development, is not always optimal (Piasta et al., 2012). It is of great concern in Belgium, where there is a need to prevent, during early childhood, an educational gap that too often depends on the socio-economic status of a child’s family (Vandenbroeck, 2015). Supporting the quality of teacher-children interactions in kindergarten may be a way to preventively support language development and educational achievement. But to date, little is known about what children experience in Belgium kindergarten, regarding language development support. The objective of this study is to document the quality of teacher-children interactions, in the second year of nursery school (4-5 years old) in the French-speaking part of Belgium. Observations take place in 23 classes. The CLASS Pre-K (Classroom Assessment Scoring System®, Pianta et al., 2008) is used for measuring the quality of teacher-children interactions. Trained observers have assessed quality of interactions along three domains: Emotional Support, Classroom Organization and Instructional support including language modeling. Results have revealed a lower quality in instructional support while showing a medium-high quality in the emotional support and classroom organization. However, scores in the instructional support increase when teachers propose activities deliberately dedicated to language. A more detailed analysis of the observations in 23 classes, in relation with number of children in the classroom and type of proposed activities will be discussed. These results will be interpreted within the particular context of kindergarten in Belgium. The present study aims at enabling a more global reflection on the modalities that can better support language development in an educational context, more particularly with more vulnerable children. [less ▲]

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See detailNet neutrality: Paid prioritization vs Zero-rating
Gautier, Axel ULiege

Conference (2017, July)

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See detailNew models to predict microcarriers just-suspended state in bioreactors for stem cell culturel
Loubière, Céline; Olmos, Eric; Guedon, Emmanuel et al

Conference (2017, July)

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See detailÉvolution de l'enneigement moyen dans les Alpes au cours du 20e siècle à l'aide du modèle atmosphérique régional MAR
Belleflamme, Alexandre ULiege; Wyard, Coraline ULiege; Doutreloup, Sébastien ULiege et al

in Dahech, Salem; Charfi, Sami (Eds.) Actes du XXXème colloque de l'Association Internationale de Climatologie - Climat, ville et environnement (2017, July)

The evolution of the snow height over the Alps can strongly impact tourism, but also the water availability of the region. In this study, we have reproduced the evolution of the climate in the Alps over ... [more ▼]

The evolution of the snow height over the Alps can strongly impact tourism, but also the water availability of the region. In this study, we have reproduced the evolution of the climate in the Alps over the 20th century with the help of the regional atmospheric model MAR forced by three reanalyses (ERA-20C, NCEP/NCAR, and ERA-Interim). MAR shows that the snow height has increased since the beginning of the 20th century, first only at higher altitudes, then also at lower levels, before knowing a strong and abrupt decrease between 1985 and 1990. This evolution, which is consistent with observations given in the literature, is directly linked with the trends of NAO and AO. In fact, the atmospheric circulation changes highlighted by NAO and AO induce temperature and precipitation changes that directly determine the snow height in the Alps. [less ▲]

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See detailA field quantification of all inclusive fish-pass efficiency using a combined telemetry system
Ovidio, Michaël ULiege; Sonny, Damien; Dierckx, Arnaud ULiege et al

Conference (2017, July)

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See detailcopycat: Testing Differential Treatment of New Transport Protocols in the Wild
Edeline, Korian ULiege; Kühlewind, Mirja; Trammell, Brian et al

in Applied Networking Research Workshop (2017, July)

Recent years have seen the development of multiple transport solutions to address the ossification of TCP in the Internet, and to ease transport-layer extensibility and deployability. Recent approaches ... [more ▼]

Recent years have seen the development of multiple transport solutions to address the ossification of TCP in the Internet, and to ease transport-layer extensibility and deployability. Recent approaches, such as PLUS and Google's QUIC, introduce an upper transport layer atop UDP; their deployment therefore relies on UDP not being disadvantaged with respect to TCP by the Internet. This paper introduces copycat, a generic transport protocol testing tool that highlights differential treatment by the path in terms of connectivity and QoS between TCP and a non-TCP transport protocol. copycat generates TCP-shaped traffic with custom headers, and compares its performance in terms of loss and delay with TCP. We present a proof-of-concept case study (UDP vs. TCP) in order to answer questions about the deployability of current transport evolution approaches, and demonstrate the extent of copycat's capabilities and possible applications. While the vast majority of UDP impairments are found to be access-network linked, and subtle impairment is rare, middleboxes might adapt to new protocols that would then perform differently in the wild compared to early deployments or controlled environment testing. [less ▲]

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See detailFunctional refractory molds for metal casting built by additive manufacturing
Bister, Geoffroy; Hautcoeur, Dominique; Deschuyteneer, Dorian et al

Conference (2017, July)

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting ... [more ▼]

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting remains not cost effective in case of prototypes and very small series due to the quite large amount time needed to build and dry the molds. Additive manufacturing may also be used to directly shape metal parts but several problems are still linked to this technique as the presence of local defects in parts and the limitation of the number of metal or alloy available for this technique on the market. We propose an intermediate method that permits to build directly molds and cores by additive manufacturing using equipment initially dedicated to build metal parts. This method presents the main advantage to cast with a large variety of metals or alloys using a single ceramic material and only one set of building conditions. The properties of the casted parts are very similar with those produced by investment casting. This technique also permits the unique advantage to control the design of the shell thickness and structure in order to have a better control of the thermal fluxes during metal cooling. This would potentially ensure a better control of some casting defects. The use of alumina processed by selective laser melting (SLM) is shown and its outstanding resistance to temperature differential is demonstrated through casting trials with two diffferent representative alloys. Casting trials in industrial conditions will be illustrated. [less ▲]

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See detailPerformance of gridded and along-track altimetry products in eddy manifestation in the Western Mediterranean
Karimova, Svetlana ULiege

in Proc. IGARSS 2017 (2017, July)

In the present work, we assess the performance of different sea level anomaly (SLA) products in manifesting mesoscale eddies of the Western Mediterranean. As ‘ground truth’ in this study we use eddy ... [more ▼]

In the present work, we assess the performance of different sea level anomaly (SLA) products in manifesting mesoscale eddies of the Western Mediterranean. As ‘ground truth’ in this study we use eddy manifestations found in sea surface temperature (SST) fields of the region of interest. Co-location of eddies found in thermal imagery with closed contours of the fields of SLA showed that only anticyclonic eddies exceeding approx. 70 km in diameter can be more or less sustainably manifested in the fields of SLA and its derivatives. Detection of cyclonic eddies, presumably due to their small spatial and temporal scales and non-geostrophic nature, is problematic. A preliminary analysis of the along-track SLA data seemed to support the conclusions made for the gridded SLA products. Application of a vector geometry approach to eddy detection, in its turn, seems to lead to an excess of large cyclonic eddies and thus biasing resulting mesoscale eddy statistics. [less ▲]

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See detailFish habitat selection in a large hydropeaking river: strong individual and temporal variations revealed by telemetry
Plichard, Laura; Capra, Hervé; Pella, Hervé et al

Conference (2017, July)

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See detailAn approach to automated spiral eddy detection in SAR images
Karimova, Svetlana ULiege

in Proc. IGARSS 2017 (2017, July)

Satellite derived synthetic aperture radar (SAR) imagery frequently contains manifestations of coherent structures (eddies) of different spatial scale. However, due to strong dependence of SAR imaging on ... [more ▼]

Satellite derived synthetic aperture radar (SAR) imagery frequently contains manifestations of coherent structures (eddies) of different spatial scale. However, due to strong dependence of SAR imaging on the near-surface wind speed during the SAR acquisition, such eddy manifestations can be at great extent masked by the signatures of other, mostly atmospheric, phenomena. In the present paper, we propose a method for an automated detection of eddy manifestations visualized by surfactant films presenting on the water surface. The method proposed based on sequential application of image transformations aimed at masking atmospheric phenomena and highlighting the surfactant filaments manifesting eddies in SAR images. Thus extracted dark patches are being fitted by circles, and close co-location of several such circles would be considered an eddy manifestation. [less ▲]

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See detailLanguage and analogical reasoning in children with Specific Language Impairment: The effect of articulatory suppression
Krzemien, Magali ULiege; Thibaut, Jean-Pierre; Stoffels, Valentine ULiege et al

Poster (2017, July)

Analogical reasoning shares a mutual influence with language development: analogical reasoning is improved by labelling analogical items with words describing the relations that they contain. Conversely ... [more ▼]

Analogical reasoning shares a mutual influence with language development: analogical reasoning is improved by labelling analogical items with words describing the relations that they contain. Conversely, structural alignment, a core mechanism of analogical reasoning, allows the acquisition of novel words and the development of grammar (Gentner, 2010). Given those findings, some authors have taken interest in the analogical reasoning ability of children with language disorders, and specifically of children with Specific Language Impairment (SLI). Those children have worse performance than their age-matched peers without language disorders in linguistic or non-linguistic analogical tasks (Leroy, Maillart, & Parisse, 2014). Our aim here is to see if this weakness is due to their language disorders and if they use the same verbal strategies as their peers to solve an analogical task. To experience these assumptions, we use a perceptual analogical task following an A:B::C:D paradigm: participants have to find the relation between two geometric forms A and B and to apply it to the C term in order to find the D term among distractors. The distractors either share perceptual features with the C term, what creates a competition that shall be inhibited, or not. Moreover, children are faced with three interfering task conditions: one without any interfering task, one with an articulatory suppression secondary task and one with a tapping secondary task, which is used in order to measure the general dual task demands. Comparing the results of these conditions will allow us to evaluate the impact of language and verbal strategies on analogical reasoning in control and SLI children. [less ▲]

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See detailClinical outcome after tracheal resection and anastomosis for correction of a tracheal stenosis in a sport pony
Salciccia, Alexandra ULiege; Roose, Charlotte; Joostens, Zoé ULiege et al

Poster (2017, July)

Introduction: Tracheal stenosis, which refers to a narrowing of the tracheal lumen, is infrequent in horses. The literature is scarce about outcome after treatment of this pathology. Objectives: To report ... [more ▼]

Introduction: Tracheal stenosis, which refers to a narrowing of the tracheal lumen, is infrequent in horses. The literature is scarce about outcome after treatment of this pathology. Objectives: To report our experience using tracheal resection and anastomosis to treat a severe trauma-induced tracheal stenosis (< 1 cm diameter of lumen) involving 2 tracheal rings causing a loud respiratory noise at rest in a 14 y.o. event pony. Methods: The pony was trained to wear a martingale preoperatively. Before the surgery, a distal tracheotomy was performed for placement of the tracheal tube for maintenance of gaseous anaesthesia. Through a 35 cm ventral midline cervical incision, the trachea was exposed and separated from adjacent tissues. Stay sutures were placed in tracheal cartilage adjacent to the segment to be removed. The 2 tracheal rings involved in the stricture were subsequently removed. On both remaining segments of the trachea, the mucosa was turned back over the open end and sutured to the adventitia. The head was then flexed and tracheal ends were apposed using 5 stainless steel wires placed equidistantly around the trachea without mucosal penetration. The anastomosis was completed by a simple continuous suture of resorbable material on the adventitia. A closed suction drain was applied in the soft tissue before routine closure of the subcutaneous and cutaneous layers. The martingale was applied before the recovery from anaesthesia, which was uneventful. The tracheotomy tube and the suction drain were left in place for 48h. The martingale was removed after 3 weeks. The pony was discharged 1 month after surgery. Control endoscopies were performed during hospitalisation and at 7, 10, 17, 21 and 30 weeks and 1 year after surgery. Results: A moderate cicatrix recurred. The excessive tissue was injected with triamcinolone and then with 4% formaldehyde during the first endoscopies and remained stable thereafter. Some stainless steel cerclages broke and displaced slightly. This caused the formation of a self-resolving seroma caudally to the trachea. A moderate respiratory noise was still audible at low-intensity work, which was resumed 4 months postoperatively. However, work was stopped before achieving the preoperative level because the pony developed a lameness. Conclusions: Although a moderate tracheal cicatrix recurred after surgery, tracheal resection and anastomosis clearly improved the quality of life of this pony. [less ▲]

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See detailFish learned movements in a large regulated river
Capra, Hervé; Pella, Hervé; Ovidio, Michaël ULiege et al

Conference (2017, July)

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See detailAntarctic sea ice trophic status
Van der Linden, Fanny ULiege; Moreau, Sébastien; Champenois, Willy ULiege et al

Poster (2017, July)

The sea ice ecosystem is characterized by steep gradients in temperature, salinity, light and nutrient availability. Despite these challenging environmental conditions, sea ice provides a dynamic habitat ... [more ▼]

The sea ice ecosystem is characterized by steep gradients in temperature, salinity, light and nutrient availability. Despite these challenging environmental conditions, sea ice provides a dynamic habitat for diverse communities of microorganisms. These communities include a wide variety of organisms from different taxonomic groups such as algae, bacteria, heterotrophic protists, fungi as well as viruses [Horner et al., 1992; Deming, 2010; Thomas and Dieckmann, 2010; Poulin et al., 2011]. In the frame of the YROSIAE project (Year-Round survey of Ocean-Sea-Ice-Atmosphere Exchanges), carried out at Cape Evans in McMurdo Sound (Antarctica) from Nov. 2011 to Dec. 2012, ice cores, seawater, and brine material were collected at regular time intervals. Physical properties (salinity, temperature, texture) and biogeochemical parameters (pCO2, dissolved inorganic carbon, total alkalinity, chlorophyll-a, macro-nutrients) were analysed. We will here particularly consider changes inused dissolved inorganic carbon (DIC) and chlorophyll-a (chl-a) , used as a proxiesy of net community production and autotrophic biomass, respectively. A high spatial and temporal variability in ice algal biomass and DIC evolution were observed. From spring, very high chl-a concentrations (>2400μg.L^(-1)) were observed at the bottom of the ice, a common feature of land fast ice in the McMurdo Sound. This suggests high primary production. However Strikingly, , at the same time, nutrients at the bottom of the ice increased significantly suggesting high heterotrophyremineralisation. In the middle of the ice column, evolution of DIC is was marked by a succession of autotrophic and heterotrophic phases. The overall increase of DIC suggests that the ice interior was rather heterotroph. Such sea ice system should expel CO2. Yet, strong under-saturation in CO2 and DIC depletion appeared at the ice surface, suggesting that sea ice was taking up CO2 from the atmosphere. On the whole, land fast sea ice in McMurdo Sound appears as a puzzling ecosystem. It is able to support elevated growth of autotrophic organisms at the bottom, but still appears to be heterotrophicin parallel to high remineralization, while the top of the ice appears to be rather heterotrophic but stilland able to pump CO2 from the atmosphere. [less ▲]

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See detailIs a new definition of intermodal transport interesting for transferring flows from road to more environmentally friendly modes?
Mostert, Martine ULiege; Limbourg, Sabine ULiege; Caris, An

Conference (2017, July)

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like ... [more ▼]

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like air pollution or climate change. Intermodal freight transport i.e. the transportation of goods using two or more modes of transport, in the same loading unit, without handling of the goods themselves is identified by the European Commission as an interesting solution for limiting the negative impacts of transport. In the classical conception of intermodal transport, pre- and post-haulage travels are supposed to be short, and to be performed by road transport, whereas the long-haul travel is done using rail or inland waterways (IWW). The objective of this study is to determine the impact on intermodal attractiveness of allowing other combinations of modes than the classical road-rail/IWW-road combination, during an intermodal travel. The goal is to determine the flow distribution of goods between direct transportation by road, rail or IWW, and any combination of these modes using intermodal transport. The novelty consists in taking into account three modes of transport in a mixed integer programming model, and to allow the transfer from any mode to any other at intermodal terminals where these modes coexist. For testing the hypothesis of intermodal transport attractiveness on medium to long distance, the model is applied to experimental data at the European level. [less ▲]

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See detailTrajectory planning of soft link robots with improved intrinsic safety
Lismonde, Arthur ULiege; Sonneville, Valentin; Bruls, Olivier ULiege

in IFAC-PapersOnLine (2017, July)

For human-robot cooperation, intrinsic safety approaches aim at reducing the energy involved in the motion of the robotic system and at increasing the system compliance in order to reduce the risk of ... [more ▼]

For human-robot cooperation, intrinsic safety approaches aim at reducing the energy involved in the motion of the robotic system and at increasing the system compliance in order to reduce the risk of injury in case of an unexpected collision. Robots based on lightweight and inherently exible links exhibit attractive features in this context but the control of their motion then leads to a tremendous challenge. This paper presents a novel trajectory planning method for 3D robots which aims at improving the tracking accuracy despite the link exibility. [less ▲]

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See detailOptimising workforce and energy costs by exploiting production flexibility
Cuvelier, Thibaut ULiege; Louveaux, Quentin ULiege

Conference (2017, July)

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro ... [more ▼]

In a world where the electricity prices become more and more volatile, notably due to renewable energies, the industry is suffering from cost variations never seen before, especially when electro-intensive. Nevertheless, the plants can significantly reduce this impact: some electro-intensive factories could shift their production to time periods where the electricity is cheaper, resulting in large savings. At the same time, the grid operator can remunerate this consumption adaptation as a flexibility service. Our research goal is to optimise the operations of a factory around this flexibility. We compute a production plan that adapts to price forecasts, but also flexibility levers that adjust this plan to react to unexpected price changes. We propose the unifying concept of reservoir to provide sufficiently good models for the plant's processes. Nevertheless, this methodology implies to have frequent production plan changes, which directly impacts the workers, as they may be asked to follow barely predictable schedules. This has a significant detrimental effect on their quality of life. As a consequence, the human aspect of flexibility must also be considered: we seek for production plans that consider both workforce and energy costs, and we then assign workers to work shifts while ensuring their well-being. This HR orientation is the most innovative contribution of this research project. [less ▲]

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See detailCan we use semiochemicals to control Aphis craccivoraKoch?
Bayendi-Loudit, Sandrine ULiege; Yarou, Boni Barthélémy ULiege; Boullis, Antoine ULiege et al

Poster (2017, July)

Amaranthus hybridus L. (Amaranthaceae) is among the most important vegetable crop in several sub-Saharan countries. Aphis craccivora Koch (Homoptera: Aphididae) is an aphid species that cause significant ... [more ▼]

Amaranthus hybridus L. (Amaranthaceae) is among the most important vegetable crop in several sub-Saharan countries. Aphis craccivora Koch (Homoptera: Aphididae) is an aphid species that cause significant losses in absence of chemical control. In this laboratory research, we evaluate the efficiency of informative substances (E-b-farnesene, methyl salicylate, essential oil of Ocimum gratissimum L. and Ocimum basilicum L.) to repel aphids from their host plant. Our assays were carried out in plastic trays containing twenty-five amaranth plants. In each tray, twenty apterous A. craccivora adults were placed on the central plant (release plant) associated with a semiochemical releaser containing 100 µl of the substance to be tested diluted in paraffin oil. The number of aphids was then counted on each plant surrounding plants every three-days for twelve days. We observed a significant repulsive effect of O. gratissimum and O. basilicum essential oils, that considerably reduced the aphid population on the treated plant, compared to control. However, no repulsive effect of E-b-farnesene and methyl salicylate on aphids was observed. Bioactivities of these substances and their using as alternative aphicidal in integrated pest management are discussed [less ▲]

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See detailComparison of a dynamic model and experimental results of a residential heat pump with vapor injection and variable speed scroll compressor
Dechesne, Bertrand ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege et al

in PROCEEDINGS OF ECOS 2017 (2017, July)

The first part of this paper presents a Modelica-based dynamic model of the system. Finite-volume models are used for the heat exchangers and the evaporator model takes into account frost formation. A ... [more ▼]

The first part of this paper presents a Modelica-based dynamic model of the system. Finite-volume models are used for the heat exchangers and the evaporator model takes into account frost formation. A thermodynamic model of the vapor injection scroll compressor is developed using empirical correlations for the volumetric efficiency, isentropic efficiency and the ratio between the injection and suction mass flow rate. The second part presents experimental results of a vapor injection and variable speed scroll compressor air to water residential heat pump. The unit is a 10kW residential system working with R410a as working fluid and capable of providing floor heating and domestic hot water. It was tested in a controlled environment in order to achieve a wide range of outdoor, including frosting conditions, and indoor conditions. The model predictions and experimental results are compared in order to validate the component models in steady state. The experimental investigations showed that there is room for improvement on the control side of the system and the developed model can be used in order to develop model based control of the injection and outdoor electronic expansion valves. [less ▲]

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See detailRECONSTRUCTION DE L'ÉVOLUTION DU RAYONNEMENT SOLAIRE REÇU EN SURFACE EN EUROPE OCCIDENTALE SUR LA PÉRIODE 1900-2014 À L'AIDE DU MODÈLE ATMOSPHÉRIQUE RÉGIONAL MAR
Wyard, Coraline ULiege; Fettweis, Xavier ULiege; Belleflamme, Alexandre ULiege et al

in Dahech, Salem; Charfi, Sami (Eds.) Actes du XXXe colloque de l'Association Internationale de Climatologie : Climat, ville et environnement (2017, July)

Many studies show that the surface solar radiation has underwent large variations over the second half of the 20th century as a result of variations in cloud cover and aerosol loading in the atmosphere ... [more ▼]

Many studies show that the surface solar radiation has underwent large variations over the second half of the 20th century as a result of variations in cloud cover and aerosol loading in the atmosphere. However, it is difficult to build strong conclusions before the 1950' because of the observations scarcity. The evolution of the surface solar radiation has been reconstructed over 1900-2014 using the regional model MAR (« Modèle Atmosphérique Régional ») in Belgium. Boundary conditions were provided by four reanalysis products : the ERA-interim (1979-2014) completed by the ERA40 (1958-1978), the NCEP/NCAR-v1 (1948-2014), the ERA-20C (1900-2010) and the 20CRV2C (1900-2010). Results show that the reanalyses can generate divergent trends while they assimilate observations and are supposed to represent the same climate. [less ▲]

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See detailThe question of the methane increase through the retrieval of its isotopologues from FTIR ground-based observations
Bader, Whitney ULiege; Strong, Kimberley; Walker, Kaley

Poster (2017, July)

Methane (CH4) is the second most important greenhouse gas emitted by human activities in the Earth’s atmosphere. Although it is roughly 200 times less abundant than carbon dioxide, it is a 28 times more ... [more ▼]

Methane (CH4) is the second most important greenhouse gas emitted by human activities in the Earth’s atmosphere. Although it is roughly 200 times less abundant than carbon dioxide, it is a 28 times more potent greenhouse gas. Approximately one fifth of the changes in the Earth’s balance energy caused by human-linked greenhouse gases since the beginning of industrialization (~1750) is due to methane. Methane is emitted by both natural sources and human activities. Indeed, methane can be emitted to the atmosphere through coal mining, oil and gas exploitation, rice cultures, domestic ruminant animals, biomass burning, waste management, wetlands, termites, methane hydrates and ocean. Since the beginning of the industrialization, atmospheric methane concentrations have increased by 260% to reach 1824 pbb in 2013. From the 1980s until the beginning of the 1990s, atmospheric methane was significantly on the rise, then stabilized during 1999-2006 to rise again afterwards. To this day, the source or sink responsible of this latter increase remains unexplained. Through each emission process, heavy molecules of methane (with one additional neutron either on a carbon or on one hydrogen atom) are emitted along methane (12CH4). The main heavy molecules of methane, called isotopologues (13CH4 and CH3D), are respectively ~110 and ~60 000 times less abundant than methane. Despite their small abundances, they give crucial information on the concentration of methane in the atmosphere and its evolution. Indeed, both isotopologues are emitted with specific emission ratio depending on the emission sources. Determining isotopic ratio of atmospheric methane is therefore a unique tracer of its budget. While the non-monotonous trend of methane is subject of an extensive number of studies, to our knowledge, no study of the isotopic ratio of methane derived from ground-based solar observations has been published to date. Measurements of heavy methane from Fourier Transform InfraRed spectra recorded with state of the art spectrometers installed at Eureka [Arctic, Canada] and Toronto [Ontario, Canada] will help fill this gap. Indeed, the produced time series will ease data interpretation and contribute to a global view of the question of isotopologues. [less ▲]

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See detailAgency and delinquency among adolescence during their transition to adulthood: what role in the desistance process?
Puglia, Rosa ULiege; Glowacz, Fabienne ULiege

Poster (2017, June 31)

Recent studies have shown that agency plays an important role in the desistance process. This variable allows the transition from delinquent identity to non-delinquent identity. However, despite ... [more ▼]

Recent studies have shown that agency plays an important role in the desistance process. This variable allows the transition from delinquent identity to non-delinquent identity. However, despite increasing literature about this topic, there is a lack of consensus regarding the role of this variable in the desistance process. Also, the way to measure this phenomenon remains unclear. In our study, agency is thought within a border framework, namely the understanding of all kind of behavior. According to the social cognitive theory, emotional and cognitive processes influence human behavior: emotions and thoughts that will define ways of acting and will motivate behavioral changes. Outcomes expectancies can be help or hinder for the concretization of behavioral change. We conducted a qualitative research among adolescents (aged 17-18) who are engaged in a delinquent trajectory. Our objective are to understand how these young in transition to adulthood leave delinquent lifestyle by evaluating to their life course and delinquent course. Each participant was interviewed with a semi-structured interview. To ensure that the interviews provided rich insights into participants’ reality, the interview was designed to elicit detailed information on relevant themes including identity, turning point, future and delinquency trajectory. Desistance was not explicitly questioned. All interviews were taperecorded and analyzed using IPA method (Smith, 2003). Mastery Scale (Pearlin, 1978), Causal Attribution Scale (Rossier, 2002), Hope Scale (Snyder, 1991) and University Rhode Island Change Assessment Scale (McConnaughy, 1983) were also administered. We see that the younths interviewed are at different stage in their desistance process. All of them, persistent or desistant, consider taking a hold on their lives. These results encourage thinking agency in the understanding of all kind of behavior. We should then take into account the beliefs and expectations of results as a variable mediating the relationship between agency and desistance. [less ▲]

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See detailPopular Music Studies in French Universities
Pirenne, Christophe ULiege

Conference (2017, June 30)

Since the turn of the century, the study of popular music has become one of the hottest topics in French Universities. Of the 71 existing institutions, nearly all of them have one or another official ... [more ▼]

Since the turn of the century, the study of popular music has become one of the hottest topics in French Universities. Of the 71 existing institutions, nearly all of them have one or another official expert on that question. But between the study of a national or an international heritage, between scientific disciplines and humanities, researches devoted to popular music seems to be as perennial as fragmented. My paper will aim to present the evolution of recruitment in this area. Which disciplines were the most active in those recruitments and, beyond these raw numbers, what does it mean ? Why is the French academic situation so different to that of Italy for example ? What are the challenges of this academisation ? Which topics are taught under this heading ? I’d like to show that next to the objective reasons of this disciplinary interest, there are also various institutional issues that seems to correspond exactly to the assumptions of Bruno Latour (La science en action, 1989) and Edward Slowik (Structure of Musical Revolutions, 2007). [less ▲]

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See detailLa narrativité greimassienne comme élément d'organisation du sens dans le croisement du football et la publicité
Bassilua Nzuzi, Anicet ULiege

Conference (2017, June 30)

Considérée comme principe d’organisation du discours (Greimas et Courtés, 1979), la narrativité greimassienne semble garder ce statut au-delà des types d’objets sur lesquels elle a été testée à l’origine ... [more ▼]

Considérée comme principe d’organisation du discours (Greimas et Courtés, 1979), la narrativité greimassienne semble garder ce statut au-delà des types d’objets sur lesquels elle a été testée à l’origine, par exemple le système d’oppositions dans les figures-signes. Notre étude, consacrée aux pratiques du football et de la publicité telles qu’elles se réalisent et se croisent au stade, montre que la narrativité, en lien avec le système tensif des possibles, organise aussi le parcours du sens dans cette interaction. Cette opération se déroule à deux niveaux de pertinence hiérarchisés: niveau de l’organisation syntagmatique de chacun des deux ensembles (niveau inférieur) et niveau de leurs ajustements l’un vers l’autre (niveau supérieur). On repère ainsi, pour le football, par exemple une organisation syntagmatique qui se réalise par la succession des séquences (passe, tacle, but, etc.) qu’opèrent des sujets (joueurs) à partir d’un système ordonné des modes d’existence des unités (potentialisation /virtualisation - actualisation/réalisation). Pour la publicité, cela se réalise à travers l’agencement des syntagmes (topologiques, eidétiques, chromatiques) qui s’inscrivent sur les objets-supports (panneaux) selon le même schéma. Les deux univers s’ajustent par la suite grâce à la combinaison de deux types d’articulations (statiques et dynamiques) qui, au final, aboutit à la formation d’une sorte de discours englobant “football-publicité” qui présente une organisation syntaxique propre. [less ▲]

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See detailThe role of Gender, Race, and Class in Transnational Political Movements: Mexican and Colombian Women Engaging in Homeland Politics from Europe’s Capital
Lara-Guerrero, Larisa; Vivas Romero, Maria ULiege

Conference (2017, June 30)

Drug trafficking is a mounting security problem in Latin America, specifically for the primary producers of narcotics in the region: Mexico and Colombia. The security concern from both countries has ... [more ▼]

Drug trafficking is a mounting security problem in Latin America, specifically for the primary producers of narcotics in the region: Mexico and Colombia. The security concern from both countries has triggered the political and social mobilization of Mexican and Colombian migrants from abroad many of them from the Global City of Brussels. This paper unpacks the motivations and dynamics behind transnational political activism organized by Mexican and Colombian women living in Brussels. By integrating and revising insights from social movements theories, political transnationalism from migration studies and intersectionality studies, this paper elaborates on the role of migrant women organizing and sustaining transnational political movements to change the political conditions of their countries of origin. The ethnographic evidence presented in this paper reveals the importance to recognize the individual level in the analysis of transnational movements. Women are cognitive actors with political ideals and emotions whose political activism is highly influenced by social categorizations such as gender, race, class, and generation. [less ▲]

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See detailAntarctic cyanobacteria: from diversity to genomics
Wilmotte, Annick ULiege

Conference (2017, June 30)

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See detailVibration Induced Phenomena in Granular Media in Microgravity
Opsomer, Eric ULiege; Noirhomme, Martial ULiege; Vandewalle, Nicolas ULiege

in EPJ Web of Conferences (2017, June 30)

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See detailSmall solar system bodies as granular systems
Hestroffer, Daniel; Campo Bagatin, Adriano; Losert, Wolfgang et al

in EPJ Web of Conferences (2017, June 30)

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See detailNetwork DEA with Common Weights
Hatami Marbini, Adel ULiege

Conference (2017, June 29)

Data envelopment analysis (DEA) generally includes two properties. First, DEA is based upon the overall efficiency without observing the internal structure of a production system. Second, a multiplier DEA ... [more ▼]

Data envelopment analysis (DEA) generally includes two properties. First, DEA is based upon the overall efficiency without observing the internal structure of a production system. Second, a multiplier DEA model allows a production system to select input and output weights in a total flexible way. However, it is essential to deal with these two properties in reality. This paper presents a common-weights DEA model where the internal structure of a production system is known. We also present a numerical example to exemplify the applicability of the proposed model in this research. [less ▲]

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See detailMean and variance of Dynamic Functional Connectivity in Parkinson’s Disease
Baquero Duarte, Katherine Andrea ULiege; Guldenmund, Pieter; Rouillard, Maud ULiege et al

Poster (2017, June 29)

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See detailAssessment of AquaCrop for winter wheat using satellite derived fCover data
Mohamed Sallah, Abdoul-Hamid ULiege; Wellens, Joost ULiege; Tychon, Bernard ULiege et al

in 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

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See detailExperimental characterisation of tape spring nonlinear compliant mechanisms
Dewalque, Florence ULiege; Schwartz, Cédric ULiege; Denoël, Vincent ULiege et al

Conference (2017, June 29)

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving ... [more ▼]

Tape springs are compliant mechanisms used as alternative to kinematic joints, for example, in deployable space structures. To reach a detailed understanding of their highly nonlinear behaviour, involving buckling, the formation of folds, nonlinear vibrations and hysteresis, an experimental set-up is designed. Dynamic and quasi-static tests are performed, as well as small amplitude vibration tests and large amplitude deployments in order to collect data in a broad variety of cases. The acquisition equipment consists of a 3D motion analysis system which triangulates the position of active markers and a force plate. The reproducibility of the acquisitions is assessed and the parameters affecting the measurements are identified. In the end, a finite element model is developed and correlated with the experimental results. [less ▲]

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See detailDe la caricature à la bande dessinée, et retour : enjeux poétiques et médiatiques d’une affinité (1830-1890)
Stienon, Valérie ULiege

Conference (2017, June 29)

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de ... [more ▼]

Dans quelle mesure la caricature, avec sa créativité graphique et les sociabilités artistiques et journalistiques sur lesquelles elle repose, a-t-elle constitué un paramètre décisif dans l’émergence de l’art séquentiel au XIXe siècle ? La bande dessinée et la caricature ne sont pas seulement deux langages qui s’accommodent l’un à l’autre sur des supports partagés, en journal et en album, mais aussi des formes d’expression résultant de conditions techniques de production du texte-image, de réseaux éditoriaux croisés et d’une inscription dans l’actualité socioculturelle. On sait l’importance de l’équipe Aubert, pionnière de la caricature de presse, dans la reprise de l’œuvre de Töpffer via la collection des Jabots. Il reste à comprendre pourquoi certains caricaturistes ont initié l’art séquentiel sans l’affirmer comme tel (cas de J.J. Grandville) et comment la bande dessinée s’est approprié spécifiquement la pratique de la charge à mesure qu’elle trouvait son propre développement (voir notamment l’œuvre de Christophe). Centrée sur la production de la période 1830-1890, la communication propose d’examiner la culture matérielle qui détermine les diverses réorganisations du dispositif unissant la vignette à la légende, et d’étudier sous cet angle le triple rapport à l’actualité, à la sérialité et à l’humour qui anime conjointement la caricature et la bande dessinée. [less ▲]

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See detailPotato monitoring in Belgium with "watchITgrow"
Piccard, Isabelle; Gobin, Anne; Wellens, Joost ULiege et al

in 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images (2017, June 29)

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See detailSpatial OnLine Analytical Processing Applied to Cities Security with Raster Data - A Case Study on Emergency Services of Brussels Agglomeration
Kasprzyk, Jean-Paul ULiege; Devillet, Guénaël ULiege

Conference (2017, June 29)

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social ... [more ▼]

Public institutions in charge of cities security are confronted to always more complex and voluminous data. In particular, georeferenced data can be extracted from many sources: mobile phones, social media, cars, security camera, satellite images, crowdsourcing, geography portals, etc. Uses of these data are various. For instance, it is very precious to firefighters in order to fairly distribute their resources (equipment and men) on the territory. These large spatial data sets (“Big Data”) require powerful tools for their extraction and their analysis. For this purpose, an original Spatial OnLine Analytical Processing (SOLAP) model is developed for emergency services. A case study involving firefighters and medical aids of Brussels is presented [less ▲]

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See detailCo-producing sociotechnical solutions in difficult times: the art of governing nuclear wastes in France
Parotte, Céline ULiege; Delvenne, Pierre ULiege

Conference (2017, June 29)

Radioactive wastes and their management are posing pressing political and epistemic issues to modern societies such as, for instance, how shall we design sociotechnical solutions to deal with an object ... [more ▼]

Radioactive wastes and their management are posing pressing political and epistemic issues to modern societies such as, for instance, how shall we design sociotechnical solutions to deal with an object with a half-life of more than 100.000 years? This paper’s starting point is the so-called “participatory turn” in the nuclear waste management (NWM) in France, when tensions appeared concerning claims of epistemic authority of national nuclear agencies. In 1990, in the aftermath of violent contestations and citizen mobilization in four Departments, the then Prime Minister of France, Michel Rocard, decided to impose a one-year moratorium on the research conducted by the national nuclear waste management organization (ANDRA). A not so well-known parliamentary technology assessment (PTA) institution, OPECST (the French Office Parlementaire d’Evaluation des Choix Scientifiques et Technologiques), was called to the rescue to clear up a difficult situation and to restore trust between state and scientific agencies and a critical population. We find that OPECST played a surprisingly central role in defining the French NWM program. [less ▲]

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See detailA Discussion on the Advancement of Blade Tip Timing Data Processing
Kharyton, Vsevolod; Dimitriadis, Grigorios ULiege; Defise, Colin

in Proceedings of the Turbomachinery Technical Conference & Exposition, TURBO EXPO 2017 (2017, June 29)

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration ... [more ▼]

The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration specialists. Its advantages include its non-intrusive nature and its capability of being used for long-term monitoring, both in on-line and off-line analysis. However, the main drawback of BTT is frequency aliasing. Frequency aliasing effects in tip timing can be reduced by means of the application of different methods from digital signal analysis that can exploit the non-uniform nature of the data sampled by BTT. This non-uniformity is due to the fact that an optimization of the circumferential distribution of BTT probes is usually required in order to improve the data quality for targeted modes of blade vibration and/or orders of excitation. The BTT data analysis methods considered in this study are the non-uniform Fourier transform, the minimum variance spectrum estimator approach, a multi-channel technique using in-between samples interpolation, the Lombe-Scargle periodogram and an iterative variable threshold procedure. These methods will be applied to measured data representing quite a large scope of events occurring during gas-turbine compressor operation, e.g. synchronous engine order resonance crossing, rotating stall, suspected limit-cycle oscillations. Finally, the frequency estimates obtained from all these methods will be summarized. [less ▲]

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See detailL’usage vocal des professeurs de formation musicale
Remacle, Angélique ULiege; Schiller, Isabel ULiege; Sfez, Lou et al

Conference (2017, June 29)

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent ... [more ▼]

Introduction : En Belgique, les professeurs de formation musicale, ou professeurs de solfège, dispensent une éducation à la musique par un enseignement du langage musical. Plus précisément, ils enseignent l’apprentissage de la rythmique, de la lecture et de l’écriture de partitions, la pratique du chant, le développement de l’oreille musicale, ou encore la constitution d’un répertoire de référence. Ces enseignements sont dispensés dans des académies de musique ou des conservatoires. En tant que professionnels de la voix, ces professeurs font partie des travailleurs les plus à risque de consulter un phoniatre pour leur voix (1). Cependant, leur usage vocal reste peu décrit. Cette étude a pour objectif 1) de mesurer la charge vocale de professeurs de formation musicale en contexte professionnel et extra-professionnel, 2) de décrire l’influence du bruit ambiant sur leur voix et 3) d’identifier l’impact de la charge vocale sur leur qualité et leur fatigue vocale. Méthode : 13 professeurs de formation musicale (9 femmes, 4 hommes) ont été enregistrés pendant une semaine complète à l’aide d’un dosimètre vocal (VoxLog) porté du lever au coucher. Le dosimètre mesure la durée de phonation et la fréquence vocale (F0) avec un accéléromètre, ainsi que l’intensité de la voix et du bruit ambiant avec un microphone positionné au niveau du cou. L’analyse du signal est réalisée avec le logiciel VoxLog Discovery. Ce logiciel calcule notamment le nombre d’oscillations des plis vocaux par jour. A la fin de chaque journée, les professeurs ont auto-évalué leur qualité et leur fatigue vocale à l’aide d’échelles visuelles analogiques. Résultats : Les paramètres vocaux et le bruit ambiant sont significativement plus élevés en contexte professionnel qu’extra-professionnel (p<.001). L’élévation du bruit ambiant est accompagnée d’une élévation de l’intensité vocale pour les 13 professeurs (r=.61, p<.001), ainsi que d’une augmentation de F0 pour les femmes (r=.41, p=.002) mais non pour les hommes (r=.39, p=.055). Enfin, le bruit ambiant élevé est associé à une augmentation de la durée de phonation (r=.05, p<.001). L’augmentation du nombre d’oscillations journalier des plis vocaux est associée à une augmentation de la fatigue (r=0.438, p<.001) et à une diminution de la qualité vocale (r=-0.538, p<.001). Conclusion : De façon similaire aux professeurs d’école (2), les paramètres vocaux ainsi que le bruit ambiant sont significativement plus élevés en contexte professionnel. Sur leur lieu de travail, les professeurs d’éducation musicale sont confrontés à un bruit ambiant dépassant la limite recommandée par l’OMS (3). En accord avec l’effet Lombard, ce bruit élevé est associé à une augmentation de l’intensité vocale. Chez les femmes, une voix plus aigüe est observée en environnement bruyant. Comme dans l’étude de Ternström, Södersten et Bohman (4), un bruit ambiant élevé est associé à une durée de phonation plus importante, potentiellement dû à une prolongation des segments voisés par souci d’intelligibilité. En conclusion, les professeurs de formation musicale utilisent leur voix de manière intensive dans le cadre de leur travail, alternant voix parlée et voix chantée. Les corrélations entre le nombre d’oscillations journalier et les auto-évaluations montrent que la quantité de voix utilisée a un impact sur le ressenti des participants. De plus, l’élévation du bruit est corrélée à une augmentation des paramètres de charge vocale. Bibliographie 1. Remacle, A., Petitfils, C., Lejeune, L., Finck, C., & Morsomme, D. (2015, April 10). What is the professional profile of patients in phoniatrics? Oral communication presented at the 4th International Occupational Voice Symposium, London, UK. 2. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57, 406-415. 3. Inserm. (2006). La voix : Ses troubles chez les enseignants (Expertise collective). Paris : Institut National de la Santé et de la Recherche médicale. 4. Ternström, S., Södersten, M., & Bohman, M. (2002). Correlation of simulated environmental noise as a tool for measuring vocal performance during noise exposure. Journal of Voice, 16(2), 195-206. [less ▲]

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