References of "Scientific congresses and symposiums"
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See detailSmart Aquaponics: development of intelligent management tools for aquaponic systems adapted to professionals, urban communities and education
Stalport, Benoît ULiege; Lebeau, Frédéric ULiege; Jijakli, Haissam ULiege

Poster (2018, March)

In this project, intelligent connected aquaponic systems are developed for production and educational aims . Technological features could simplify the use, enable automation and make it possible for ... [more ▼]

In this project, intelligent connected aquaponic systems are developed for production and educational aims . Technological features could simplify the use, enable automation and make it possible for individuals from varied backgrounds (schools, entreprises and agriculture sector) to use the connected systems. Data are continuoulsy collected by sensors and sent to servers where mathematical models compute the future probable behaviors and warn the users if necessary. Users can access their system state parameters through a user-friendly interface that is also pro-vided for simple management. Simultaneously the models and the data are used to feed a serious gaming interface where users can create simulations and learn from virtual aquaponics. [less ▲]

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See detailImproving the accuracy of 1D SNMR surveys using the multi-central-loop configuration
Kremer, Thomas ULiege; Michel, Hadrien; Muller-Petke, Mike et al

Poster (2018, March)

A multi-central loop configuration has been studied through forward and inverse modelling of synthetics and real data. This set-up takes advantage of the multichannel features of the NMR device and ... [more ▼]

A multi-central loop configuration has been studied through forward and inverse modelling of synthetics and real data. This set-up takes advantage of the multichannel features of the NMR device and consists of using several (2 to 3) additional receiver loops displayed concentrically with the main transmitter/receiver loop, which all record the NMR signal simultaneously within a single acquisition. If the loop diameters are chosen appropriately, the kernel sensitivity distributions for each receiver loop can show complementary features. Inverting simultaneously the data sets obtained through each different receiver loop can then enhance the accuracy of the final model. To do so, a 1D QT inversion scheme in the frequency domain dedicated to the inversion of multiple data sets is being used. One challenging feature is to adapt the regularization of the inverse process so as to handle correctly the noise originating from different data sets. The efficiency of this multi-central loop acquisition set-up and procedure is being assessed through the forward and inverse modelling of several scenarios implying varying aquifer characteristics. Finally a field case is being presented that was conducted on a low noise level site located in Germany, where conditions were favourable to the implementation and testing of circular multi-central loop configurations.We also introduce a new method for determining NMR parameters, named the prediction-focused-approach (PFA), that is based on statistical analysis of a large number of simple models. We observe, using synthetic examples, that the effciency of the method benefits from the use of the multi-central-loop configurations. [less ▲]

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See detailThe survival toolkit of the Antarctic cyanobacterium Phormidesmis priestleyi ULC007
Lara, Yannick ULiege; Durieu, Benoit ULiege; Pessi, Igor et al

Conference (2018, March)

Extreme seasonality led by rapid changes in day length and harsh environmental conditions make Antarctica a unique habitat. Freshwater ecosystems range from cryoecosystems and ice shelf meltwater ponds to ... [more ▼]

Extreme seasonality led by rapid changes in day length and harsh environmental conditions make Antarctica a unique habitat. Freshwater ecosystems range from cryoecosystems and ice shelf meltwater ponds to perennially ice-covered lakes where conspicuous benthic microbial mat communities constitute most of the biomass. In these mats, cyanobacteria form the matrix in which other microorganisms can live, and where they are the key primary producers and main drivers of the carbon and food webs[1].
Narrow filamentous cyanobacteria belonging to the order Pseudanabaenales are especially abundant in polar microbial mats [2]. Despite the dominance of cyanobacteria on the Antarctic continent, there is currently no study available on the genomic evolution of Antarctic cyanobacteria. Here we investigate the genome of a widely distributed Antarctic cyanobacterium, Phormidium priestleyi ULC007. To provide a better understanding of the survival strategies of this taxon, we used high-throughput sequencing technologies to investigate its geographic distribution and genome evolution. More precisely, we investigated the abundance of genes in targeted functional categories based on the RAST subsystems technology, so as to provide a better overview of the genetic mechanisms involved in cold adaptation and circadian oscillation [3]. In Polar regions, low temperatures lead to the success of particular organisms featuring adaptations to molecular and cellular disturbances such as rigidity of membranes, reduction of enzyme-catalyzed reactions, and solute transport. Our main results underline the importance of functional categories of genes involved in the production of key molecules for the survival of polar P. priestleyi (e.g. exopolysaccharides, chaperone proteins, fatty acids and phospholipids). [less ▲]

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See detailComparaison entre infiltrations de plasma riche en plaquettes et d’acide hyaluronique pour le traitement des tendinopathies patellaires
Kaux, Jean-François ULiege; Roberjot, Mathieu; Samson, Antoine

in Journal de Traumatologie du Sport (2018, March), 35(1), 63

Introduction : Le traitement des tendinopathies patellaires reste difficile. C’est la raison pour laquelle de nouveaux traitements ont été développés, parmi lesquels les injections de plasma riche en ... [more ▼]

Introduction : Le traitement des tendinopathies patellaires reste difficile. C’est la raison pour laquelle de nouveaux traitements ont été développés, parmi lesquels les injections de plasma riche en plaquettes (PRP) ou d’acide hyaluronique (AH). Certaines séries cliniques ont précédemment évalué l’effet du PRP dans le traitement des tendinopathies patellaires proximales. Une revue systématique récente a conclu que les PRP pouvait être recommandé comme traitement dans cette indication. Récemment, l’AH en injection a été proposé comme traitement des tendinopathies. Certaines études fondamentales montrent des résultats encourageants sur la capacité de l’AH à promouvoir le glissement du tendon, de réduire les adhérences et améliorer son organisation architecturale. Quelques observations cliniques confirment également son impact sur la douleur et la fonction de patients avec tendinopathies. Méthodes : Trente-trois sportifs avec tendinopathies patellaires proximales non soulagés après plus de trois mois de traitements rééducatif classique ont été inclus dans l’étude. Dix-huit d'entre eux (groupe 1) ont reçu une injection de PRP pauvre en leucocytes (obtenu à l’aide d’un appareil d’aphérèse) et 15 autres sujets (groupe 2) ont bénéficié de 2 injections d’AH à 1 semaine d’intervalle; les 2 groupes ont bénéficié d’une rééducation standardisée post-infiltration. Concernant le suivi de la pathologie, une évaluation de la douleur par une échelle visuelle analogique (EVA), des scores algo-fonctionnels (IKDC, VISA-P), un algomètre de pression, un test isocinétique (associé à une EVA)) ainsi qu’une échographie du tendon patellaire (US) ont été réalisés à 3 reprises (avant injection, après 6 semaines, 3 mois après les injections). Résultats : Les résultats de l’EVA (p < 0,01), de l’algomètre de pression (p < 0,01), les scores IKDC (p < 0,01) et VISA-P (p < 0,01) montrent une amélioration significative dans les deux groupes, mais pas pour les résultats US. Pour le groupe 1, les tests isocinétiques montrent des résultats significatifs pour les ischio-jambiers à C60 °/ s, avec une amélioration de son couple de pointe maximale (p = 0, 01) pour le membre pathologique et une amélioration des différences bilatérales (p = 0,0002). Pour le groupe 2, l’amélioration du couple de pointe maximale du quadriceps à C240 ° /s est significative (p < 0,01) pour le genou pathologique après les injections après 6 semaines seulement. L’EVA associé aux tests isocinétiques diminue considérablement pour tous les modes de contraction au terme des trois mois d’études. Conclusions : Les infiltrations de PRP et d’HA peuvent toutes les 2 améliorer les symptômes de tendinopathie patellaire proximale, même si les résultats sont légèrement meilleurs au sein du groupe PRP. [less ▲]

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See detailAdaptation interculturelle du questionnaire Kujala Anterior Knee Pain Scale pour les patients francophones
Kaux, Jean-François ULiege; Buckinx, Fanny ULiege; Bornheim, Stephen ULiege et al

in Journal de Traumatologie du Sport (2018, March), 35(1), 62

Introduction : Le syndrome fémoro-patellaire est l'un des problèmes du genou les plus fréquemment rencontrés. Il se caractérise par une douleur antérieure du genou dans les activités mettant en charge l ... [more ▼]

Introduction : Le syndrome fémoro-patellaire est l'un des problèmes du genou les plus fréquemment rencontrés. Il se caractérise par une douleur antérieure du genou dans les activités mettant en charge l'articulation fémoro-patellaire. Le Kujala Anterior Knee Pain Scale (Kujala AKPS) est un questionnaire utilisé pour évaluer les symptômes subjectifs, telles que les limitations fonctionnelles et la douleur antérieure du genou. Le questionnaire a déjà été traduit et validé en turc, en portugais brésilien, en persan, en chinois, et en néerlandais. Le but de cette étude est de traduire ce questionnaire en français afin d'en évaluer sa fiabilité et sa validité. Matériel et méthode : La traduction et l’adaptation interculturelle du questionnaire ont été réalisées selon les recommandations internationales comprenant 6 étapes : traduction initiale, synthèse des traductions, traduction de retour vers la langue d’origine, comité d'experts, test de la version pré-finale et approbation du comité d'experts. Une fois la version française obtenue, les participants (n=101) ont rempli 2 fois le Kujula AKPS à un intervalle de 7 jours, et le Short Form Health Survey (SF-36) afin d'en évaluer les propriétés psychométriques (la cohérence interne, la fidélité test-retest et la validité de construit). Résultats : Le Kujula AKPS montre une fidélité test-retest élevée pour le score total (ICC 0,97). La traduction française possède une cohérence interne élevée (0,87). Le Kujula AKPS possède une corrélation forte avec une partie des sous-échelles convergentes du SF-36 (PF, RP et BP). Il y a une corrélation faible ou modérée avec les sous-échelles divergentes du SF-36 (MH, SF et VT). Il n’y a pas d’effet plancher et plafond. Conclusion : La version française du questionnaire Kujula AKPS étant facilement compréhensible, elle semble avoir une bonne adaptation interculturelle. Cette étude a démontré que le Kujula AKPSF est fiable et valide pour les patients francophones souffrant d'un syndrome rotulien. [less ▲]

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See detailLes cultures dérobées : des fourrages de qualité nutritive intéressante
Herremans, Sophie ULiege; Ferard, Alexis; Wyss, Ueli et al

in Actes des Journées de printemps de l'AFPF : Sécuriser son système d'élevage avec des fourrages complémentaires : méteils, dérobées, crucifères... (2018, March)

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See detailUse of molecular dynamics simulations to study the interactions between barley allelochemicals and plant plasma membrane
Lebecque, Simon ULiege; Crowet, Jean-Marc; du Jardin, Patrick ULiege et al

Poster (2018, March)

Gramine and hordenine, two alkaloids produced by barley, were shown to inhibit the growth of a common weed (Matricaria recutita L.). This feature could be useful in order to reach a more sustainable weeds ... [more ▼]

Gramine and hordenine, two alkaloids produced by barley, were shown to inhibit the growth of a common weed (Matricaria recutita L.). This feature could be useful in order to reach a more sustainable weeds management. In vitro experiments have proven that both molecules do interact with lipid bilayers (made of a phosphatidylglycerol (PG) lipid) mimicking plant plasma membranes and are able to modify some of their properties. Moreover, gramine was shown to be more effective than hordenine in both inhibiting weeds growth and altering lipid bilayers properties, suggesting that interactions with membranes could be linked to their mode of action. Molecular dynamics (MD) simulations are carried out in order to get an insight into the molecular mechanisms that underlie these interactions with model membranes and to discriminate between gramine behavior and hordenine behavior. [less ▲]

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See detailTraduction et validation du Exercise-Induced Leg Pain, questionnaire pour les patients francophones
Kaux, Jean-François ULiege; Hagelstein, Thibaut; Van Beveren, Julien et al

in Journal de Traumatologie du Sport (2018, March), 35(1), 62-63

Contexte : L’EILP-G a été développé afin d’évaluer la sévérité des symptômes affectant la fonction physique et les capacités sportives chez des patients présentant des douleurs de jambe à l’effort. Le ... [more ▼]

Contexte : L’EILP-G a été développé afin d’évaluer la sévérité des symptômes affectant la fonction physique et les capacités sportives chez des patients présentant des douleurs de jambe à l’effort. Le questionnaire a déjà été traduit en anglais et en grec. Objectifs : Le but de cette étude est de traduire et de réaliser une adaptation interculturelle du questionnaire EILP-G en français ainsi que d’en évaluer ses propriétés psychométriques. Matériel et Méthode : Le processus de traduction et d’adaptation interculturelle de l’exercise-induced leg pain questionnaire for German-speaking patients (EILP-G) a été guidé par les recommandations internationales d’adaptation interculturelle de questionnaires mesurant l’état de santé. Six étapes ont été respectées : (1) traduction française initiale, (2) synthèse de traduction française, (3) traduction inverse allemande, (4) comité d’expert, (5) test de la version pré-finale, (6) approbation du comité d’expert. 84 sujets furent recrutés et répartis en 3 groupes afin de tester l’EILP-FR : un groupe de sujets pathologiques (n=28), des sportifs à risque de développer ce type de pathologie (n=28) et des étudiants en sciences de la motricité asymptomatiques (n=28). Tous les sujets (n=84) ont rempli le questionnaire français à deux reprises avec un intervalle de 7 à 10 jours, parallèlement au Short Form Health Survey (SF-36) afin de pouvoir évaluer la fiabilité et la validité de l’EILP-FR. Résultats : L’EILP-FR indique une fidélité test-retest très bonne concernant le score total (ICC 0,96). Il en va de même pour le score total de chaque sous-groupe (ICC 0,88-0,94) ainsi que pour chaque item (0,75-0,92). Le questionnaire français présente une cohérence interne élevée (0,93). La corrélation entre l’EILP-FR et le SF-36 est modérée pour le score total (0,51;p<0.001). Une corrélation forte se présente entre le questionnaire et une partie des sous-échelles convergentes du SF-36 (PF, RP et BP ; chaque p<0.001). Les sous-échelles divergentes évaluant les propriétés psychologiques du SF-36 présentent toutes une corrélation faible et statistiquement non-significatives (RE, SF, VT), excepté MH (p<0.05). Aucun effet plancher ou plafond n’a été détecté. Conclusion : La version française, adaptée de la version originale EILP-G, a été traduite et adaptée interculturellement avec succès. L’EILP-FR est un questionnaire fiable et valide pour évaluer les patients francophones souffrant de douleurs chroniques de jambe à l’effort. [less ▲]

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See detailOpal-like photoanodes with photonic effects in macroporous perovskite solar cells
Dewalque, Jennifer ULiege; Baron, Damien ULiege; Spronck, Gilles ULiege et al

Poster (2018, February 28)

Organic-inorganic metal halide perovskite compounds, used either in mesoscopic or planar solar cells architectures, have allowed preparing highly efficient solid-state devices (>20%). In mesoscopic solar ... [more ▼]

Organic-inorganic metal halide perovskite compounds, used either in mesoscopic or planar solar cells architectures, have allowed preparing highly efficient solid-state devices (>20%). In mesoscopic solar cells, a mesoporous TiO2 scaffold is incorporated into the cells. However, because of the small pore size compared to the wavelengths of visible light, the scaffold barely scatters light. In this work, we propose to design periodically structured TiO2 scaffold from colloidal crystal templating fabrication method. Polystyrene beads with diameters comparable to visible light wavelengths are used as structuring agent. The resulting opal-like photonic structure will strongly interact with light and increase light harvesting. The photoanode microstructure is characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). In parallel, light interaction is modeled in order to find the best compromise in terms of photonic architecture. Sunlight absorption by the solar cells is presented and discussed with dependency of pore sizes and number of opal-like layers. [less ▲]

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See detailFilm en débat: En bataille, portrait d'une directrice de prison (E. Duchemin)
Dubois, Christophe ULiege

Conference (2018, February 28)

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See detailDealing with Coptic codices stratigraphy: two case studies
Carlig, Nathan ULiege

Conference (2018, February 24)

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See detailLa position « armée », un instant clé dans l’apprentissage du service au tennis ? Influence de l’âge et du niveau de jeu.
Tubez, François ULiege; Forthomme, Bénédicte ULiege; Croisier, Jean-Louis ULiege et al

Poster (2018, February 24)

Introduction Lors de la réalisation du service au tennis, la position armée semble être un instant clé essentiel à la réussite du geste. Elle est le point de départ de la phase de frappe et conditionne la ... [more ▼]

Introduction Lors de la réalisation du service au tennis, la position armée semble être un instant clé essentiel à la réussite du geste. Elle est le point de départ de la phase de frappe et conditionne la bonne réalisation de celle-ci. Dans cette étude, nous étudions les caractéristiques biomécaniques de cet instant en comparant des joueurs de niveaux et d’âges différents. Matériel et Méthode Nous avons étudié les paramètres biomécaniques de la position armée de 24 joueurs, répartis en 3 groupes de niveaux et d’âges différents. Les tests ont été réalisés dans un laboratoire aménagé avec un système d’analyse optoélectronique en 3D (Codamotion). Résultats et Discussion Nous avons pu observer des différences significatives entre certains groupes, à savoir la séquence de la gestuelle, la rotation externe d’épaule, la rotation de la ceinture scapulaire dans le plan transversal ou encore la flexion des genoux. Les analyses portant sur notre groupe de joueurs professionnels nous ont permis de déterminer les paramètres d’une position armée optimale. Conclusion Notre étude a montré l’existence de différences significatives entre les groupes au niveau des amplitudes de certaines articulations à la position armée. Le niveau de jeu et l’âge des sujets influencent donc cette position, moment clef dans la réussite du service. [less ▲]

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See detailRein du sujet âgé
DELANAYE, Pierre ULiege

Conference (2018, February 23)

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See detailVascularites à ANCA
DELANAYE, Pierre ULiege

Conference (2018, February 23)

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See detailExtreme right in Austria: who are "the people" (the case of the 'Freiheitliche Partei Österreichs')?
Debras, François ULiege

Conference (2018, February 23)

In recent years, the “Freiheitliche Partei Österreichs” (FPÖ) in Austria has claimed to be the “defender of the people” and “guarantor of their interests”. In 2016-2017, the FPÖ stood as the “voice of the ... [more ▼]

In recent years, the “Freiheitliche Partei Österreichs” (FPÖ) in Austria has claimed to be the “defender of the people” and “guarantor of their interests”. In 2016-2017, the FPÖ stood as the “voice of the oppressed majority”. The party is demanding “a direct democracy in order to let the people speak”. These elements lead us to question the notion of “the people”. How should we define “the people”? What reality does it refer to? What are the underlying political and ideological issues? Firstly, to answer this question, I aim to clarify the term “the people” in populist rhetoric. The FPÖ is often described as “far-right party”. However, many scholars also refer to it as “populist party”. These terms clearly need explaining. Secondly, this work will analyse the political discourse of the FPÖ. The focus will be on the political programmes and oral communication coming from their principal representatives. This analysis is discursive. It isn’t an examination of the work performed by party supporters or members (parliamentary work, action in local authorities, etc.). Apparently, the rhetoric from the FPÖ is structured around two dichotomies: 1) the removal of social boundaries in favour of a people/elite opposition; 2) the affirmation of cultural boundaries in favour of an opposition between natives to a country and foreigners. I will explain why these notions of social and cultural boundaries have a prominent place in rhetoric in line with populist theory. The desire to suppress social boundaries, allows us to identity a first issue: sovereignty. The affirmation of cultural boundaries illustrates a second issue: unity. Finally, a third issue is transmitted through the notion of sovereignty and unity: identity. To conclude, I will return to the classification of the “Freiheitliche Partei Österreichs” as “right-wing-populist” party. I will end by answering the question: “who are ‘the people’”? This will explain why populist rhetoric responds to a feeling of unease within society and, more generally, within Western democracies. [less ▲]

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See detailMechanochemical properties of Artificial Helical Foldamers at the Single-Molecule scale by SMFS- AFM
Devaux, Floriane ULiege; Li, Xuesong; Huc, Ivan et al

Conference (2018, February 22)

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See detailExploring the relationship between anosognosia, self-memory and metacognition in Alzheimer’s disease.
Genon, Sarah ULiege; Mélon, Marlène; Collette, Fabienne ULiege et al

Poster (2018, February 22)

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See detailComment prévenir le risque biologique en laboratoire ou animalerie de recherche ?
Grignet, Christine ULiege

Conference (2018, February 22)

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See detail5. Lutte intégrée contre les maladies
Bataille, Charlotte; Duvivier, Maxime; Heens, Benoît et al

in Bodson, Bernard; De Proft, Michel; Watillon, Bernard (Eds.) Livre Blanc Céréales (2018, February 21)

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See detail4. Les régulateurs de croissance
Meza Morales, Walter ULiege; Monfort, Bruno; Henriet, François et al

in Bodson, Bernard; De Proft, Michel; Watillon, Bernard (Eds.) Livre Blanc Céréales (2018, February 21)

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See detailRetour d’expérience sur Julia pour la recherche et l’enseignement en recherche opérationnelle
Cuvelier, Thibaut ULiege

Conference (2018, February 21)

The Julia programming language has a well-developed community, especially in operational research, including mathematical optimisation. Nevertheless, it already has many practical advantages, both for ... [more ▼]

The Julia programming language has a well-developed community, especially in operational research, including mathematical optimisation. Nevertheless, it already has many practical advantages, both for research and teaching. This talk offers some feedback based on several years of Julia usage. [less ▲]

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See detailExemples d’outils et dispositifs didactiques identifiés par le Consortium "Activités Physiques, Bien-Être et Santé"
Bonni, Jérémy ULiege; Cloes, Marc ULiege

Poster (2018, February 21)

In the Wallonia-Brussels Federation (Belgium), a major reform of the education system is underway. One of the areas concerned is the promotion of physical activity, well-being and health at school. A ... [more ▼]

In the Wallonia-Brussels Federation (Belgium), a major reform of the education system is underway. One of the areas concerned is the promotion of physical activity, well-being and health at school. A working group is in charge of identifying, designing and sharing didactic devices and tools that could be used by the practitioners in elementary education. The presentation illustrates the wealth of contents currently available on the Internet aimed at promoting physical activity, well-being and health in schools. [less ▲]

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See detailBooster l’activité physique, le bien‐être et la santé à l’école dans le cadre du Pacte pour un Enseignement d’Excellence : Mission impossible ?
Bonni, Jérémy ULiege; Cloes, Marc ULiege

Conference (2018, February 21)

In the French speaking region of Belgium, an important reform of the educational system is in progress. Among the projects that are in preparation, one is focused on the promotion of physical activity ... [more ▼]

In the French speaking region of Belgium, an important reform of the educational system is in progress. Among the projects that are in preparation, one is focused on the promotion of physical activity, wellness and health at school. A working group is in charge of identifying and testing teaching tools that could be used by the practitioners in elementary education. The presentation describe the process that has been implemented in such a way and provide some examples of the current developments in order to inform physical educators about the evolution of their missions. [less ▲]

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See detailSynthesis of bimetallic catalysts supported on alumina by an aqueous sol-gel process
Lambert, Stéphanie ULiege

Conference (2018, February 20)

The thermochemical method called “biomass gasification” is generating emphatic interest for the production of bio-Syngas (CO+H2) since this process presents the advantage of being renewable without ... [more ▼]

The thermochemical method called “biomass gasification” is generating emphatic interest for the production of bio-Syngas (CO+H2) since this process presents the advantage of being renewable without emitting CO2. However, in practical applications, there are still some technical problems due to high concentration of tars in the outlet gas, which can condensate and clog the pipes. Previous studies have highlighted the fact that the tar elimination via catalytic reforming seem to be the more practical and economical solution. Catalysts were synthesized by an aqueous sol-gel process to develop γ-Al2O3 doped with 10 wt.% of nickel and 2 wt.% of a second dopant (Co, Cu, Fe, Mn, Mo). Before their adding in AlOOH sol, metallic dopants were complexed with (OCH3)3-Si-(CH2)3-NH-(CH2)2-NH2 (EDAS) to increase their dispersion by cogelation between EDAS and AlOOH clusters. All the samples were tested for toluene reforming at 650°C for 300 min. No previous reduction step has been realized. Each 15 min, injection was sent to a GC Compac for analysis. For samples Al2O3-10Ni-2Mn and Al2O3-10Ni-2Mo, the addition of Mn or Mo allows increasing the toluene conversion up to 100%, whereas all other samples present lower toluene conversion (around 30%). Taking into account the benzene selectivity, it is observed that Mn and Mo are both elements that favor the degradation of aromatic groups. In term of carbon deposit during catalytic test, sample Al2O3-10Ni-2Mn is the most interesting doping since only 0.04 gcarbon gcata-1 is depicted by TG-DSC measurement after catalytic test. [less ▲]

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See detailCharacterization of apple metagenome in Belgium
Sare, Abdoul Razack ULiege; Jijakli, Haissam ULiege; Massart, Sébastien ULiege

Poster (2018, February 19)

Microbial communities (microbiota) living at the surface of fruit have been the source of most of biocontrol agents. Despite this interest, their role as a community has been poorly studied due to the ... [more ▼]

Microbial communities (microbiota) living at the surface of fruit have been the source of most of biocontrol agents. Despite this interest, their role as a community has been poorly studied due to the lack of techniques to survey the holistic microbiota and their evolution. Thanks to high-throughput sequencing, their holistic study is now possible. In this study, we characterized apple fruit surface bacterial microbiome in Belgium. Seventeen apple varieties grown in four disease management practices [no phytosanitary treatment (conservation orchard), light-organic, organic and conventional] were harvested and their microbiota collected for DNA extraction and Illumina sequencing. The sequencing (2x250 nucleotides) targeted the V3-V4 16s ribosomal DNA and bioinformatic analysis were carried out with QIIME1.9.0. A total of 3,302,088 filtered high-quality sequences were assigned into 13,507 Operational Taxonomic Units (OTUs). Proteobacteria (64%) and Bacteriodetes (22%) were by far the dominant phyla. A total of 60 OTUs were present in 90% of samples, and they can be considered as a bacterial core microbiota. No significant difference (Bonferroni probability > 0,05) of Kruskall-Wallis was identified between tested varieties of Golden, Jonagold and Elstar for conventional and organic treatment as well as varieties of conservation orchard. The overall analysis (without varieties) of alpha diversity (Observed-OTUs, Shannon, Simpson and phylogenetic diversity) and beta diversity show differences among not treated, organic and conventional apples. These results underline not only a diverse microbiota whose role needs to be characterized, but also a diversity of apple microbiota that was reduced across the time by modern agriculture. [less ▲]

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See detailGames and multidimensional shape-symmetric morphisms
Rigo, Michel ULiege

Conference (2018, February 19)

The general motivation behind this talk is to present some interplay between combinatorial game theory and combinatorics on multidimensional words. We do not assume that the participants have any prior ... [more ▼]

The general motivation behind this talk is to present some interplay between combinatorial game theory and combinatorics on multidimensional words. We do not assume that the participants have any prior knowledge in CGT. Thus, we will present some basic concepts from combinatorial game theory (positions of a game, Nim-sum, Sprague-Grundy function, Wythoff’s game, ...). We will see that games provide examples of k-automatic, morphic or k-regular sequences (in the sense of Allouche and Shallit). Subtraction games played on several piles of token naturally give rise to a multidimensional setting. Thus, we consider k-automatic and k-regular sequences in this extended framework. In particular, determining the structure of the bidimensional array encoding the (loosing) P-positions of the Wythoff’s game is a long-standing and challenging problem in CGT. Wythoff’s game is linked to non-standard numeration system: P-positions can be determined by writing those in the Fibonacci system. The main part of this talk is to discuss the concept of shape-symmetric morphism introduced by Maes: instead of iterating a morphism where images of letters are (hyper-)cubes of a fixed length k, one can generalize the procedure to images of various shape. We will present several decision problems which are decidable thanks to automata. [less ▲]

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See detailLe brassage entre l'urbanisme et le mining. Un aperçu historique de l'urbanisation de Kolwezi
Geenen, Kristien ULiege

Conference (2018, February 17)

La ville de Kolwezi doit son existence à son riche sol et – par conséquence – au secteur minier. Inévitablement, son urbanisation est étroitement liée à l’industrie minière. Cette présentation offre un ... [more ▼]

La ville de Kolwezi doit son existence à son riche sol et – par conséquence – au secteur minier. Inévitablement, son urbanisation est étroitement liée à l’industrie minière. Cette présentation offre un aperçu historique du développement de la ville de Kolwezi, à partir de l’époque précoloniale jusqu’à nos jours. Marcelin Mukembe (historien, ISTM et Institut Mutoshi) expose l’histoire de la région avant l’arrivée du colonisateur, quand les chefs coutumiers tels que Kamimbi gouvernaient le territoire où naitra la future ville de Kolwezi. Ensuite Kristien Geenen (anthropologue, Université de Liège, projet WORKinMINING) expose l’histoire urbaine de la ville, en commençant par les premiers lotissements faits par les Européens en 1920, qui s’étaient établies vers Dilala, et le premier camp des travailleurs de l’Union Minière en 1926, l’actuelle cité Gécamines Kolwezi. Le choix de l’emplacement de la ville de Kolwezi fut sujet de maintes discussions entre les autorités coloniales, dont quelques-uns jugeaient que la ville était située bien trop près des carrières, empêchant son élargissement futur. Comme l’exposé l’illustre avec des anciennes cartes de la ville, celle-ci était plus ou moins encerclée par les concessions destinées aux activités minières de l’Union Minière du Haut Katanga. Le Ministre des Infrastructures et Travaux Publics, Son Excellence Norbert Mbangu Mwangal, et Jean-Pierre Mwamba pourvoient les présentations d’un cadre géologique qui aide à contextualiser cette histoire urbaine de la ville de Kolwezi. Illustré par des extraits de correspondances, des anciennes et actuelles photos et cartes, ainsi que par des vues aériennes montrant les rues de la ville à l’époque coloniale, cet exposé éclaircit aux Kolwéziens la naissance de leur ville, produit d’un brassage entre l’urbanisation et le mining. [less ▲]

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See detailEhlers-Danlos syndrome in the University Hospital of Liege
KUKOR, Léna ULiege; BERTOLI, Sabrina ULiege; Bours, Vincent ULiege et al

Poster (2018, February 16)

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See detailConstructing futurity: a contrastive approach to L1 and L2 Dutch and French
Sambre, Paul; Perrez, Julien ULiege; Van Keirsbilck, Pascale et al

Conference (2018, February 16)

Context - Traditional grammar (Fleishman 1982) and constructional analyses of the future in other languages, largely concentrate on verbal predications (Berghs 2010, Hilpert 2008) as locus of futurity ... [more ▼]

Context - Traditional grammar (Fleishman 1982) and constructional analyses of the future in other languages, largely concentrate on verbal predications (Berghs 2010, Hilpert 2008) as locus of futurity. Furthermore, previous research in L1 (Dabrowska 2012) and L2 (Deknop et al. fc./2016) has shown individual productive variance in constructional profiles and lexical knowledge in adult speakers. Objective -This talk proposes a contrastive approach to describing constructional profiles and a conceptual network for futurity in L1 and advanced learners L2 Dutch and French (B1-C1 in CEFR). Corpus and procedure - The corpus is composed of elicited spoken Dutch and French, based on a questionnaire imposed on 20 L1/L2 speakers, who are asked questions about their future professional future in their mothertongue and thereafter in L2 Dutch or French (40 interactions). The questions combine different verb and nominal constructions for future time reference and are based on a usage-based construction network of futurity (AUTHOR 2009, 2012) inspired by Langacker's (2008) extended epistemic model. This conceptual CxG network future time includes variation in tense and epistemic modality. (Expected) results - We describe and measure the constructional L1 and L2 profiles, comparing/correlating them as to their productivity for futurity in L1/L2. There are two important extensions of previous studies on future constructions. (1) The future is conceived at the interface between different predication types. (2) Future talk is taken at the level of larger-than-clause interaction (Nikiforidou 2011; Östman 2004). (3) Non-epistemic modality and complex clauses encode future time. (4) The descriptive approach leads to guidelines for teaching more authentic L2 constructions for futurity based on L1 constructions beyond the traditional scope of verbs and/or modes in a coherent conceptual framework. [less ▲]

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See detailLe Contre de Lisle
Durand, Pascal ULiege

Conference (2018, February 09)

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See detailThe Translator's Visibility: from the Archives to the Internet
Letawe, Céline ULiege

Conference (2018, February 09)

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See detailLos aztecas en Europa: genericidad de la ucronía hispanoamericana contemporánea
Francois, Jeromine ULiege

Conference (2018, February 09)

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See detailTocopherol analysis of almond oils produced in eastern Morocco
Melhaoui, R.; Fauconnier, Marie-Laure ULiege; Sindic, Marianne ULiege et al

Poster (2018, February 08)

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See detailWhat is the landscape of artisanal cheese production in Belgium?
Gerard, Amaury ULiege; Daube, Georges ULiege; Sindic, Marianne ULiege

Conference (2018, February 08)

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See detailMise en place d’un protocole de mesure de force musculaire des membres inférieurs à l’aide d’un pèse-personne
Liégeois, Kenny; Tubez, François ULiege

in Kinésithérapie Revue (2018, February 08), 18(194), 42-43

Objectif L’objectif de cette étude est de proposer le pèse-personne (Fig. 1) comme une alternative d’évaluation de la force musculaire des membres inférieurs. Pour ce faire, nous tentons de démontrer la ... [more ▼]

Objectif L’objectif de cette étude est de proposer le pèse-personne (Fig. 1) comme une alternative d’évaluation de la force musculaire des membres inférieurs. Pour ce faire, nous tentons de démontrer la répétabilité du protocole. Méthodologie L’étude porte sur vingt-neuf sujets âgés de 18 à 26 ans et étudiants en kinésithérapie. Les mesures ont été réalisées grâce à un pèse-personne digital placé sur un support attaché sur un espalier. Les positions d’évaluation sont au nombre de quatre, deux pour chaque groupe musculaire ; une en course interne et l’autre en course externe. La répétabilité de l’outil est évaluée et analysée grâce à un test Anova pour la comparaison des essais à un même temps, et pour la comparaison des valeurs à J0 et J7, nous avons utilisé le test de Pearson. Résultats Les 29 sujets ont terminé l’étude. La répétabilité de l’outil et du protocole mis en place a montré une forte corrélation ; avec un coefficient de corrélation intraclasse entre 0,90-0,98 (P-value < 0,05). Ensuite, les données ont été triées par groupe musculaire et course articulaire en regroupant tous les essais, ce qui a permis de réaliser un test Anova prouvant alors la répétabilité du procédé par une différence non significative. Conclusion Cette étude permet d’élargir les perspectives d’évaluation de la force musculaire. En comparaison aux autres méthodes quantitatives, le pèse-personne est peu co-teux et de surcroît, déjà intégré dans l’environnement du kinésithérapeute. [less ▲]

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See detailInventory of the raw milk butter production in Wallonia (Belgium)
El-Hajjaji, Soundous ULiege; De Laubier, Juliette ULiege; Di Tanna, Sybille ULiege et al

Poster (2018, February 08)

Since the fourteenth century, the marketing of butter, which is considered one of the first dairy products, is done on an international scale. In Belgium, butter production in 2016 increased by 7.7% in ... [more ▼]

Since the fourteenth century, the marketing of butter, which is considered one of the first dairy products, is done on an international scale. In Belgium, butter production in 2016 increased by 7.7% in comparison with 2015 to reach 87,506 tons. According to the scientific opinion 09/2016 of the Scientific Committee of the Federal Agency for the Safety of the Food Chain, there is a wide variation in the production processes and types of farm butter made from raw milk. [less ▲]

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See detailTocopherol content of almond oils produced in eastern Morocco
Melhaoui, R.; Fauconnier, Marie-Laure ULiege; Sindic, Marianne ULiege et al

Conference (2018, February 08)

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See detailStudy of the development of Listeria monocytogenes in raw milk butter
El-Hajjaji, Soundous ULiege; De Laubier, Juliette ULiege; Di Tanna, Sybille ULiege et al

Poster (2018, February 08)

Currently, Listeria monocytogenes is considered one of the most important foodborne pathogens. It is often implicated in epidemics of human listeriosis that represents a real health risk, given the high ... [more ▼]

Currently, Listeria monocytogenes is considered one of the most important foodborne pathogens. It is often implicated in epidemics of human listeriosis that represents a real health risk, given the high mortality rate (over 25%) of infected persons. Listeria monocytogenes can directly or indirectly contaminate products and the environment, which makes Listeria a worrying pathogen for the dairy industry. The Commission Regulation (EC) 2073/2005 on microbiological criteria for foodstuffs, imposes an absence of this pathogen in 25g of the products able to support the growth of Listeria monocytogenes. This criterion is applicable to products before they leave the immediate control of the food business operator, unless the manufacturer is able to demonstrate, to the satisfaction of the competent authority, that the product will comply with the limit of 100 cfu/g throughout the shelf life. As butter is a product with a wide variation in the production process, more information and data on the growth and survival of Listeria monocytogenes in relation to formulation and butter structure are therefore needed. [less ▲]

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See detailCatabolic selectable marker eases genome editing in Yarrowia lipolytica
Vandermies, Marie ULiege; Denies, Olivia ULiege; Nicaud, Jean-Marc et al

Conference (2018, February 08)

Selectable markers are a central component of genome edition technologies. In the yeast Yarrowia lipolytica, these markers are traditionally based on antibiotic resistance (hygromycin B) or auxotrophy (e ... [more ▼]

Selectable markers are a central component of genome edition technologies. In the yeast Yarrowia lipolytica, these markers are traditionally based on antibiotic resistance (hygromycin B) or auxotrophy (e.g., leucine, uracil). However, the use of the former is impaired by a high level of spontaneous resistance, and the use of the latter by continuous complementation of the culture medium or restoration of prototrophy to the strains. As an alternative, genes related to the catabolism of carbon sources, or “catabolic selectable markers”, present the advantage of not being involved in essential metabolic pathways. The recently identified EYK1, encoding erythrulose kinase, can serve as an efficient catabolic selectable marker for genome editing in Y. lipolytica. Compared to auxotrophic markers such as URA3 and LEU2, EYK1 increases the growth rate of transformants on selective medium and the efficiency of genome edition. The utility of the marker EYK1 in a replicative vector was also demonstrated. Besides, the cloning-free strategy developed here simplifies the construction of disruption cassettes for genome editing in Y. lipolytica. [less ▲]

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See detailCloud architecture for digital phenotyping and automation
Debauche, Olivier ULiege; Mahmoudi, Saïd; Manneback, Pierre et al

in IEEE Cloud Computing (2018, February 08)

Digital phenotyping presents a very important tool for scientists to measure with high accuracy the effects of external phenomena on plant development. Plant phenotyping is mainly based on imaging ... [more ▼]

Digital phenotyping presents a very important tool for scientists to measure with high accuracy the effects of external phenomena on plant development. Plant phenotyping is mainly based on imaging techniques. However, the number of images and parameters used to store and treat these parameters are continuously growing. Consequently, the high-throughput of data and the need of specific treatment in real or near real-time requires a large quantity of resources. Moreover, the increasing amount of particular phenotyping case studies needs the development of specific application. Cloud architectures offers means to store a wide range of numerous data and host a large quantity of specific software to process these data. In this paper, we propose to match digital phenotyping need and cloud possibilities in a lambda cloud architecture in order to store and treat this important amount of data. We also propose a data platform allowing to host applications and access to the stored data within the lambda architecture. The present application platform allows to use several frameworks with a fine-grained resource use of the cluster. We develop then a case study in a controlled environment system (growth chamber) where we grow basil plants. [less ▲]

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See detailVersatile regulated promoter for Yarrowia lipolytica
Vandermies, Marie ULiege; Trassaert, Marion; Carly, Frédéric et al

Poster (2018, February 08)

The non-conventional yeast Yarrowia lipolytica is an emerging cell factory for the production of recombinant protein and metabolites. Still, there is a lack of versatile inducible promoters in this yeast ... [more ▼]

The non-conventional yeast Yarrowia lipolytica is an emerging cell factory for the production of recombinant protein and metabolites. Still, there is a lack of versatile inducible promoters in this yeast. In the present study, we isolated and characterised the promoter of the recently discovered gene EYK1 (encoding an erythrulose kinase). The promoter pEYK1 shows high induction levels in presence of erythritol and erythrulose, while its induction is impaired in presence of glycerol and glucose. Based on pEYK1 upstream activating sequence, we developed a series of promoters with enhanced induction levels. The induction levels of pEYK1 were also improved in strain eyk1Δ, allowing to use erythritol and erythrulose as free inducers. [less ▲]

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See detailWhat is the landscape of artisanal cheese production in Belgium?
Gerard, Amaury ULiege; Daube, Georges ULiege; Sindic, Marianne ULiege

Poster (2018, February 08)

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See detailLa modélisation 3D comme outil de convergence des données au service du projet patrimonial
Hallot, Pierre ULiege; Houbart, Claudine ULiege

Conference (2018, February 08)

L’une des difficultés rencontrées par les étudiants en architecture confrontés au patrimoine classé (ou non) est la prise en compte des données multiples issues de l’étude interdisciplinaire du bien ... [more ▼]

L’une des difficultés rencontrées par les étudiants en architecture confrontés au patrimoine classé (ou non) est la prise en compte des données multiples issues de l’étude interdisciplinaire du bien concerné, qu’ils en soient ou non les auteurs. Données historiques et archéologiques, identification des matériaux et pathologies, étude de la structure, potentiel et limites d’usage, sont autant de paramètres qui doivent guider les options de restauration ou de reconversion, mais qui sont trop souvent mis de côté, voire oubliés, au moment de passer au stade du projet. Dans ce contexte, nous sommes convaincus que la modélisation 3D du patrimoine, peut, en plus de fournir les données dimensionnelles indispensables au projet, servir de support virtuel à la représentation des données collectées. La convergence des savoirs dans une structure intégrée peut constituer un outil au service de l’évaluation patrimoniale et de l’établissement d’un projet en pleine connaissance de cause. La modélisation 3D dans un environnement virtuel permet de confronter plus aisément les différentes sources relatives à l’édifice, notamment au travers de la composante spatiale permettant la localisation de chaque donnée collectée. La participation des étudiants à la réalisation et l’alimentation du modèle « intelligent » tout au long du processus les engage activement dans l’approche interdisciplinaire en les amenant à collecter et croiser les données issues des diverses études (en général dispersées au sein de plusieurs rapports, mobilisant diverses techniques, confrontant plusieurs approches du métier), à en comprendre la complémentarité et à en faire un véritable ressort du projet. Finalement, le contexte virtuel 3D développé dans l’approche permet d’analyser aisément les premières les hypothèses du projet au travers de son environnement et de l’ensemble des informations collectées. [less ▲]

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See detailEffect of cooking methodes on omega-6/omega-3 and hypo/hypercholesterolemic ratios of Bebni-Guil lamb meat from eastern Morocco
Belhaj, K.; Mansouri, F.; Sindic, Marianne ULiege et al

Conference (2018, February 08)

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See detailNotebooks, reproducibility and other topics in ocean sciences
Troupin, Charles ULiege

Conference (2018, February 08)

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See detailHolomorphic cohomological convolution and Hadamard product
Dubussy, Christophe ULiege

Conference (2018, February 06)

In his thesis, T. Pohlen succeeded in defining a Hadamard product between holo- morphic functions defined on star eligible open sets of the Riemann Sphere. We show how this theory is actually a particular ... [more ▼]

In his thesis, T. Pohlen succeeded in defining a Hadamard product between holo- morphic functions defined on star eligible open sets of the Riemann Sphere. We show how this theory is actually a particular case of the holomorphic cohomological convolution, defined in a general way thanks to the integration map on a complex Lie group. [less ▲]

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See detailIntegrated continuous flow photoreactors: Photooxidation of (L)-methionine with singlet oxygen
Emmanuel, Noémie ULiege; Mendoza Gallego, Carlos ULiege; Winter, Marc et al

Poster (2018, February 06)

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See detailTowards Understanding the Mechanical Properties of Protein Secondary Structures: A Single-Molecule Force Spectroscopy Study of Synthetic Helical Foldamers
Devaux, Floriane ULiege; Li, Xuesong; Huc, Ivan et al

Conference (2018, February 05)

For thousands of years, nature has selected and perfected the conformation foldings of its molecular machines. They are set out to fulfill the most diverse chemical or mechanical functions in nature. In ... [more ▼]

For thousands of years, nature has selected and perfected the conformation foldings of its molecular machines. They are set out to fulfill the most diverse chemical or mechanical functions in nature. In order to understand reaction pathways of such bio-molecular machines and to mimic nature’s creations using chemical syntheses, it is essential to understand the origins of molecular foldings and their influence on the mechanical properties of these machines. We specifically designed synthetic molecular models of secondary helical structures to allow us to simplify the many parameters occurring simultaneously in nature. The aim of our study is two-fold: identify the relationships between the chemical sequence of the foldamers and their (un)folding forces and mechanisms and expand the limits of Single-Molecule Force Spectroscopy (SMFS) as our model systems are much smaller than natural (bio)polymers. Here, we study the mechanochemical properties of our folded aromatic oligoamides [Huc, 2014] at the monomolecular level using SMFS with an Atomic Force Microscope. We investigated several different sizes of foldamers in solution. Each of the foldamers yielded reproducible and specific force-extension curves, showing a characteristic unfolding pattern with multiple features. The unfolding pattern was consistent with a sequential opening of entities with identical interactions. While the measured pattern lengths were directly proportional to the foldamer sizes, the average unfolding forces showed a non-linear dependence on the foldamer size. This could be retraced to cooperative effects in the foldamer sequence. Finally, compared to natural biopolymers [Ritort, 2016;, Seitz, 2001], our foldamers exhibited increased stabilities when submitted to external loads. The interactions at the origin of this observation were selectively investigated by performing a solvent study. [less ▲]

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See detailImproving the bioinformatics analysis of HTS clonality data in virus-induced leukemia
Hahaut, Vincent ULiege; Rosewick, Nicolas; Artesi, Maria ULiege et al

Poster (2018, February 02)

Proviral integration into the host genome is one of the main hallmarks of infection by oncogenic retroviruses. This event creates a life-long signature, each infected cell being characterized by a ... [more ▼]

Proviral integration into the host genome is one of the main hallmarks of infection by oncogenic retroviruses. This event creates a life-long signature, each infected cell being characterized by a specific integration site (IS). Monitoring of the clonal architecture over time (clone: population of cells sharing an identical IS) has significantly contributed to a better understanding of HIV persistence, gene therapy vector mediated treatment and deltaretrovirus-induced leukemia. Our lab recently developed an optimized high-throughput sequencing (HTS) based clonality method. It enables the identification of proviral integration sites genome-wide while simultaneously quantifying the abundance of the corresponding clones. The method is superior to any of the previously available protocols, mainly in terms of sensitivity, cost-effectiveness and hands-on time, making it suitable for routine clinical observation of infected individuals. Using this method, we recently showed that longitudinal monitoring of the dominant leukemic clone in patients infected by Human T-cell Leukemia Virus-1 (HTLV-1) better predicts therapeutic response (Artesi et al, Leukemia, 2017). We applied the method to biological samples isolated from HTLV-1 infected patients and Bovine Leukemia Virus (BLV) infected animals (bovine and sheep). This resulted in the generation of an unprecedented volume of raw sequence data. In this study we developed a novel clonality analysis pipeline that better exploits the potential of the method, improving previously published protocols. [less ▲]

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See detailBLUU-Tramp: a new H/D exchange method to identify the protein unfolding landscape
Kay, Jennifer ULiege; Corazza, Alessandra; Dumoulin, Mireille ULiege et al

Poster (2018, February 01)

Detailed reference viewed: 19 (4 ULiège)
See detailThe knotty phenotype of the frd3 Arabidopsis mutant
Scheepers, Maxime ULiege; Spielmann, Julien ULiege; Boulanger, Madeleine ULiege et al

Poster (2018, February 01)

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See detailWhen splicing meets environmental challenges
Fanara, Steven ULiege; Hanikenne, Marc ULiege; Motte, Patrick ULiege

Conference (2018, February 01)

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See detailEarly step of BlaR1 signal transduction revealed by Single-Molecule Force Spectroscopy
Dauvin, Marjorie ULiege

Conference (2018, February 01)

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See detailHydro-mechanical study of MAVL nuclear waste repository galleries in Callovo-Oxfordian claystone
Argilaga, Albert ULiege; Charlier, Robert ULiege; Cerfontaine, Benjamin ULiege et al

Conference (2018, February 01)

The disposal of radioactive waste in deep underground repositories has been studied for a long while (OECD/NEA, 1995). Argillaceous rocks have been found to be good candidates to host the repositories ... [more ▼]

The disposal of radioactive waste in deep underground repositories has been studied for a long while (OECD/NEA, 1995). Argillaceous rocks have been found to be good candidates to host the repositories because of their low permeability and the ability to absorb radionuclides. In France, the Callovo-Oxfordian argillite (COX) has been chosen by the national agency ANDRA to be the host rock to store the radioactive waste. During the previous years, the problem of gallery excavations in the COX host rock has been the case of study in Liège University. The problem, involving strain localization, is not well posed when modelled using classical theories; a microstructured model is proposed: local Second Gradient (Collin et al. 2006), this avoids the pathological mesh dependency by introducing an internal length that regularizes the problem. At the present time, the model takes into account several transverse anisotropies, e.g. cohesion (Pietruszczak et al. 2002), a visco-plastic model is retained to model the long term convergence, finally, a permeability evolution model allows to correlate strain localization and permeability increase (Pardoen et al. 2016). The purpose of this work is to model the long term behaviour of the MAVL galleries (100 years) with a special focus on the localisation extent, effect of ventilation, displacements and concrete stress state. Results (Figure 1) show an important effect of the supporting structure on the problem, the compressible wedges determine the localization mode by triggering the shear bands. Results also show a high sensitivity to the viscosity parameters. [less ▲]

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See detailPersonal Dose Computation with the Aid of Staff Monitoring system based on 3D Depth Cameras
Abdelrahman, Mahmoud Eid Mahmoud ULiege; Vanhavere, Filip; Struelens, Lara et al

Poster (2018, February 01)

For more than 50 years, passive dosimeters have been used to assess the dose to workers occupationally exposed to ionizing radiation. Such dosimeters are designed to measure the operational quantity Hp(10 ... [more ▼]

For more than 50 years, passive dosimeters have been used to assess the dose to workers occupationally exposed to ionizing radiation. Such dosimeters are designed to measure the operational quantity Hp(10) as an estimate of the effective dose, E, which is a quantitative expression of the “radiation detriment” that cannot be measured directly. With these dosimeters, the results are mostly known only after some time, and wearing a dosimeter is often seen as a burden by some workers. Furthermore, the uncertainties associated with the present dosimeters (within a factor of 1.5 or 2 from the real value) are not negligible. In line with the current move to more real time personal dose monitoring, we are working towards an innovative approach based on computational methods to determine occupational exposures. The aim of this research is to calculate doses to workers instead of measuring them. For this, the spatial radiation field, including energy and angular distribution, needs to be known. The real movement of the persons in a given workplace can be monitored in real-time using Time-of-Flight cameras and flexible computational phantoms representing the workers anatomy can be positioned using the tracking information. Finally, all this input data should be transferred to a tool, using Monte Carlo techniques to calculate the doses to the workers. As a first step, a tool used to track a person in 3D coordinates using Microsoft® Kinect™ was developed. The tool, which is utilizing the skeleton tracking algorithm embedded in the Kinect SDK from Microsoft, is capable of correctly tracking the worker movement in real-time. A series of validation experiments were performed to test the tracking tool and the dose calculation method. An anthropomorphic phantom was positioned on a moveable table in the horizontal irradiator of the Laboratory for Nuclear Calibration (LNK) at SCK•CEN. The phantom was moved to different distances from a Cs-137 source. The position of the phantom was monitored with the Kinect™ and the coordinates recorded. The dose to the phantom was calculated using different methods: 1. Using the reference values from the calibration facility (LNK), 2. Using VISIPLAN-3D: An analytical dose assessment tool developed at SCK•CEN, 3. Using MCNPX Monte-Carlo simulations, and 4. Using InstaDose® dosimeters based on direct ion storage technology. A comparison was made between each method and results showed good agreement between the reference, the measured and the calculated dose. This experiment was repeated with different degrees of complexity of movement of the phantom. This first test proved the validity of the methodology used. [less ▲]

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See detailUnderstanding mesothelioma chemoresistance and implication of ADAM in this process
Bellefroid, Marine ULiege

Poster (2018, February 01)

Mesothelioma is an aggressive cancer that affects mesothelial surfaces. The most recognized risk factor for mesothelioma is asbestos exposure since the fibres can reach the pleura and are not cleared. The ... [more ▼]

Mesothelioma is an aggressive cancer that affects mesothelial surfaces. The most recognized risk factor for mesothelioma is asbestos exposure since the fibres can reach the pleura and are not cleared. The cancerization might arise 30 to 40 years after exposure. The gold standard treatment is a combination of cisplatin and pemetrexed. Unfortunately, the available therapies have a limited impact and cancer cells quickly develop resistance to treatment. Adamalysins constitute a family of zinc dependant proteases. Among them, ADAM (a disintegrin and metalloprotease) display a conserved structure made of various domains playing roles in cell to cell interactions, cell to extracellular matrix interactions as well as the shedding of some membrane proteins. Numerous ADAM are implicated in processes leading to cancer development such as inflammation, invasion, angiogenesis and resistance to chemotherapy. ADAM8 has been described to be implicated in cisplatin resistance in NSCLC and bladder cancers. This project aims at unveiling the mechanisms of treatment resistance induced by ADAM8 and other proteases in mesothelioma. The final goal will be the development of therapeutic strategies based on the inhibition of ADAM proteases. In human mesothelioma samples, ADAM8 mRNA are overexpressed as compared to normal pleura samples. Therefore, we hypothesized that ADAM8 was implicated in cancer development and we started to investigate it in vitro. We transfected AB12 murine mesothelioma cells with shRNA targeting ADAM8. These ADAM8-ShRNA cells treated with cisplatin displayed a decreased survival rate as compared to control-ShRNA treated cells. This indicates that ADAM8 might be implicated in cisplatin resistance. Concurrently, we have generated 2 different mesothelioma cell lines resistant to cisplatin. The first is derived from AB12 cell line and the second derives from a cell line obtained by a primary cancerization mice model (6627). Briefly, the cells have been treated with increasing doses of cisplatin from 0,25 µM to 2 µM, a dose that would kill parental cell lines. The resistance of the treated cells was assessed by a cell proliferation array in presence of cisplatin and we confirm that these cisplatin-treated cell lines display an increased resistance to the drug. In the very next future, we will perform a RNA sequencing experiment in order to compare the cisplatin-resistant cell lines to the matching parental cells in order to determine which pathways are modified and would explain how the cells resist. In conclusion, our results show that ADAM8 might be implicated in cisplatin resistance in mesothelioma. In our future researches, we will aim at discovering the molecular mechanisms of resistance to cisplatin. We hypothesize that our results will shed light on pathways differentially expressed between the parental and the resistant cell lines. By understanding the modified pathways, we hope to be able to prevent chemotherapy-resistant cells to emerge. [less ▲]

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See detailExperimental investigation of a multi-evaporator refrigerator for both cabin cooling and battery thermal management
Gillet, Thomas; Andres, Emmanuelle; El-Bakkali, Amin et al

Conference (2018, February 01)

Detailed reference viewed: 48 (8 ULiège)
See detailTargeting a coagulation-EMT axis in early metastasis
Vanwynsberghe, Aline ULiege; Lambert, Justine ULiege; Francart, Marie-Emilie ULiege et al

Poster (2018, February 01)

Detailed reference viewed: 9 (1 ULiège)
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See detailEvaluation et optimalisation de la prise en charge et du suivi à domicile des patients oncologiques traités par voie orale
PAULUS; Gaspard, Olivier; Van Hees, Thierry ULiege et al

Poster (2018, February)

Detailed reference viewed: 11 (1 ULiège)
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See detailDermatophytoses animales : aspects cliniques, diagnostiques et zoonotiques
Mignon, Bernard ULiege

Conference (2018, February)

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Peer Reviewed
See detailSupporting students' learning through a program focusing on formative feedback
Leduc, Laurent ULiege; Verpoorten, Dominique ULiege

Conference (2018, February)

Designed in order to support learning and success of First-Year students enrolled in the same programs at the University of Liège (Belgium), the « Feedback First-Year Project » has been successively ... [more ▼]

Designed in order to support learning and success of First-Year students enrolled in the same programs at the University of Liège (Belgium), the « Feedback First-Year Project » has been successively implemented in five different Faculties since its creation in 2013. This structured project consists in providing a customized pedagogical support - teams of advisers made of specialists in instructional sciences and content-domain experts - to the professors in charge of First-Year courses in those schools in order to discuss the opportunity to regulate or optimize some aspects of their teaching (collectively or individually), focusing on their formative feedback practices with Freshmen. [less ▲]

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See detailSubspace-based identification of a distributed nonlinearity in time and frequency domains
Anastasio, Dario; Marchesiello, Stefano; Noël, Jean-Philippe ULiege et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXV (2018, February)

Nonlinear system identification has become of great interest during the last decades. However, a common and shared framework is not present yet, and the identification may be challenging, especially when ... [more ▼]

Nonlinear system identification has become of great interest during the last decades. However, a common and shared framework is not present yet, and the identification may be challenging, especially when real engineering structures are considered with strong nonlinearities. Subspace methods have proved to be effective when dealing with local nonlinearities, both in time domain (TNSI method) and in frequency domain (FNSI method). This study reports an improvement for both methods, as a first attempt to account for distributed nonlinearities, which is still an open question in the research community. A numerical beam under moderately large oscillations that exhibits geometric nonlinearity is considered. The object of the identification process is to exploit its behavior through the correct identification of the parameters that define the nonlinearity. Results show a high level of confidence between the two methods, and suggest that a more complete analysis of distributed nonlinear phenomena can be conducted based on these approaches. [less ▲]

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See detailLocating nonlinearity in mechanical systems: A dynamic network perspective
Noël, Jean-Philippe ULiege; Schoukens, Maarten; Van den Hof, Paul

in Proceedings of the International Modal Analysis Conference (IMAC) XXXV (2018, February)

Though it is a crucial step for most identification methods in nonlinear structural dynamics, nonlinearity location is a sparsely addressed topic in the literature. In fact, locating nonlinearities in ... [more ▼]

Though it is a crucial step for most identification methods in nonlinear structural dynamics, nonlinearity location is a sparsely addressed topic in the literature. In fact, locating nonlinearities in mechanical systems turns out to be a challenging problem when treated nonparametrically, that is, without fitting a model. The present contribution takes a new look at this problem by exploiting some recent developments in the identification of dynamic networks, originating from the systems and control community. [less ▲]

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See detailMars UV-Visible airglow observations and predictions for EXOMARS-TGO
Gérard, Jean-Claude ULiege; Gkouvelis, Leonardos ULiege; Ritter, Birgit ULiege et al

Conference (2018, February)

Airglow observations have proven to be an efficient tool to probe composition and dynamics of planetary atmospheres. Several missions to Mars such as Mariners, Mars Express and MAVEN were equipped with ... [more ▼]

Airglow observations have proven to be an efficient tool to probe composition and dynamics of planetary atmospheres. Several missions to Mars such as Mariners, Mars Express and MAVEN were equipped with ultraviolet spectrometers that probed the distribution of airglow intensity features in the spectral range extending from 120 to 340 nm. They have provided a wealth of information on several emissions arising from O, C and N excited atoms or CO, CO2 + and N2 molecules. These, in turn, have been analyzed to provide thermospheric temperature, O densities, etc. [less ▲]

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See detailNonlinearities of an aircraft Piccolo tube: Identification and modeling
Dossogne, Tilàn ULiege; Trillet, Pierre; Schoukens, Maarten et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXV (2018, February)

Piccolo tubes are parts of aircraft wings anti-icing system and consist of titanium pipes inserted into the internal structure of the slat. Due to differential thermal expansion, clearances between the ... [more ▼]

Piccolo tubes are parts of aircraft wings anti-icing system and consist of titanium pipes inserted into the internal structure of the slat. Due to differential thermal expansion, clearances between the tube and its support are unavoidable and cause the overall system to exhibit highly nonlinear behavior, resulting from impacts and friction. This paper addresses the identi cation and modeling of the nonlinearities present in the slat-Piccolo tube connection. The complete identi cation procedure, from nonlinearity detection and characterization to parameter estimation, is carried out based upon sine-sweep measurements. The use of several techniques, such as the acceleration surface method, enables to understand the complex dynamics of the Piccolo tube and build a reliable model of its nonlinearities. In particular, the parameters of nonsmooth nonlinear stiffness and damping mechanisms are estimated. The nonlinear model is finally validated on standard quali cation tests for airborne equipments. [less ▲]

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See detailDes indices pour la définition de l'état des masses d'eau en milieu marin, mises au point, applications et aide à la gestion
Gobert, Sylvie ULiege; Richir, Jonathan ULiege

in L’eau pour le développement La Gestion Intégrée des Ressources en Eau dans les Pays en développement (2018, February)

Comme les écosystèmes dulçaquicoles, les écosystèmes marins sont soumis à une pression humaine croissante qui altère la qualité de l’eau et les communautés aquatiques. Près de 98 pourcents de l’eau de ... [more ▼]

Comme les écosystèmes dulçaquicoles, les écosystèmes marins sont soumis à une pression humaine croissante qui altère la qualité de l’eau et les communautés aquatiques. Près de 98 pourcents de l’eau de notre planète bleue est contenue dans les océans qui constituent le réceptacle final de tout ce que nous rejetons comme déchets (volontairement ou non). Moins accessible, les océans sont méconnus, souvent oubliés ou négligés et considérés comme une zone inépuisable et où tout se dilue ; actuellement encore 80% des eaux usées sont rejetées en mer sans traitement préalable, à peine 2 % des surfaces marines sont protégées. La Méditerranée est particulière à plus d’un égard, bassin de concentration, de faible surface (1% des océans) abritant pourtant plus de 10% de la biodiversité mondiale. Cette petite mer est un modèle pour les océanographes : en mesurant ce qui s’y passe, nous pouvons prédire ce que se déroulera à court ou moyen terme dans le reste des océans. Le laboratoire d’Océanologie est activement impliqué depuis une quinzaine d’années dans la mise au point d’indice de la qualité des masses d’eau côtières. Ces indices sont construits sur base des connaissances du milieu (variations naturelles), par la mesure des niveaux de contamination et des effets (observation et contamination en mésocosme) de cette pollution sur les communautés. Nous avons développé et validé des indices biologiques (PREI : Posidonia Rapid and Easy Index, ICAR Indice Caulerpa cylindracea ; espèce envahissante), de pollution (TEPI : Trace Element Pollution Index, TESVI : Trace Element Spatial Variation Index), de qualité paysagère (LIMA LIttoral MArin) … Ces indices sont utilisés actuellement dans le cadre de la DCE (Directive Cadre Eau), la DCSMM (Directive Cadre Stratégie pour le Milieu Marin) et dans des réseaux de surveillance en Méditerranée, ils sont un relais et un moyen de communication entre les scientifiques et les politiques, les gestionnaires. L’exportation et l’apprentissage de l’utilisation de ces indices sont un atout pour une gestion globale de l’eau à l’échelle de la Méditerranée. Leurs applications sur l’ensemble de la façade méditerranéenne ont, entre autre, mis en évidence l’impact positif de l’application de directives européennes en matière de gestion des eaux par rapport aux côtes de Nord de l’Afrique. [less ▲]

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Peer Reviewed
See detailEffect of Voltage Constraints on the Exchange of Flexibility Services in Distribution Networks
Mathieu, Sébastien ULiege; Olivier, Frédéric ULiege; Ernst, Damien ULiege et al

in Proceedings of the 9th Conference on Innovative Smart Grid Technology North America (ISGT 2018) (2018, February)

Detailed reference viewed: 452 (34 ULiège)
See detailModel updating of a wing-engine structure with nonlinear connections
Song, Mingming; Renson, Ludovic; Noël, Jean-Philippe ULiege et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXV (2018, February)

This paper investigates the performance of a Bayesian model updating approach using nonlinear normal modes (NNMs). The proposed approach is applied to a wing-engine structure tested in the laboratory. The ... [more ▼]

This paper investigates the performance of a Bayesian model updating approach using nonlinear normal modes (NNMs). The proposed approach is applied to a wing-engine structure tested in the laboratory. The structure response to a broadband input excitation is measured experimentally. The structure NNMs are then extracted from the measured data by combining a frequency-domain nonlinear subspace identification method with numerical continuation technique. An initial finite element model of the wing-engine structure is built in Matlab and its linear stiffness parameters and the coefficients of the local nonlinearities are selected as the updating parameters. The joint posterior probability distribution of the model parameters is estimated based on their prior distribution and the likelihood function which is defined as a Gaussian distribution of error function. The error function in this study is defined as the difference between model-predicted and identified NNMs at different energy levels. The calibrated model is then used to predict the structure response (NNMs and time history), taking into account model parameters uncertainties and modeling errors. The model predictions are compared with a set of experimental results that were not used in the calibration process and only considered for validation purpose. [less ▲]

Detailed reference viewed: 44 (1 ULiège)
See detailChanging sources of bioavailable silicon during pedogenesis
de Tombeur, Félix ULiege; Lambers, Hans; Turner L., Benjamin et al

Conference (2018, February)

The importance of silicon (Si) in the global biogeochemical cycles is of the utmost importance. Hence, it acts as an essential nutrient to a number of marine organisms, accounting for up to 50% of oceanic ... [more ▼]

The importance of silicon (Si) in the global biogeochemical cycles is of the utmost importance. Hence, it acts as an essential nutrient to a number of marine organisms, accounting for up to 50% of oceanic carbon fixation. Furthermore, the chemical weathering of Si-bearing minerals controls long-term sink for atmospheric CO2. In the last twenty years, several studies highlighted the key role of the biological pumping in the global Si cycle. Indeed, plant deposits amorphous silica called “phytoliths” inside the cells of stems and leaves. Once returning to soil via litterfall, phytoliths can be used by paleobotanists to reconstruct past vegetation given specific shapes for different species as well as long resilience in soils. On the other hand, some biogeochemical studies highlighted the fact that biogenic silica can be rapidly dissolved and then recycled by vegetation through Si uptake. In this PhD project, we want to study the sources of bioavailable Si for plants over soil weathering degree. More precisely, we want to test the hypothesis that phytoliths could become the main source of bioavailable Si in highly weathered soils. To do so, we sampled 7 sandy soils over a long-term chronosequence in SW Australia including Holocene (≤ 6.5 ka), Middle Pleistocene (120-500 ka) and early Pleistocene (~ 2000 ka) dunes. Pedogenesis includes decarbonation, iron oxides release, desilification and strong eluviation. For each chronosequence stage, we sampled by pedogenic horizon, to a minimal depth of 1.5 m. We measured the so-called “bioavailable Si” in each horizon, using a 0.01M CaCl2 extractant. We also performed some XRD analysis. Si extracted with CaCl2 strongly increased with the end of decarbonation, from the Holocene to Middle Pleistocene dunes (from 2 to 7.5 mg.kg-1). It then slightly decreases until the most weathered soil, developing on an Early Pleistocene dune (around 3 mg.kg-1). We noticed that the highest concentrations of bioavailable Si have been encountered right after the decarbonation, during the iron release process and the formation of secondary minerals such as kaolinite, detected only in those soils. Henceforth, we suggest that secondary Si-bearing minerals have probably the strongest potential for releasing Si into soil solution. However, the bioavailable Si concentration in the highly weathered soil (E horizon of at least 5 meters) remains higher than in the first stages of the sequence, with an XRD analysis showing 100% of quartz. In this system, it is likely that phytoliths have become the only source releasing bioavailable Si into soil solution. However, it is premature to draw general conclusions and phytoliths physical extraction, total elemental analysis and the use of other extractants (acetic acid, Na2CO3 following the ratios Si/Al, Si/Fe and Si/Mg) will be very useful to go much further in the hypothesis. [less ▲]

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Peer Reviewed
See detailLa dramaturgie goethéenne, une source théorique du Capital de Marx
Ghanbari Matin, Soheil ULiege

Conference (2018, February)

Pour l’analyse de la forme valeur de la marchandise, Marx se sert de « l’abstraction » semblablement à « des réactifs fournis par la chimie ». Ainsi, l’analyse de la marchandise révèle sa nature ... [more ▼]

Pour l’analyse de la forme valeur de la marchandise, Marx se sert de « l’abstraction » semblablement à « des réactifs fournis par la chimie ». Ainsi, l’analyse de la marchandise révèle sa nature ontologique : la contradiction entre la valeur d’usage et la valeur d’échange lui étant constitutive, la marchandise gagne à être vue comme « corporéité chimique » — extériorisation même de la contradiction d’une activité polarisée qui devient effective dans son interaction avec d’autres marchandises. Or, la transition de la forme valeur générale à la forme argent débouche sur le caractère fétiche de la marchandise et son secret : la relation entre les marchandises se substitue à la richesse des relations sociales. Partant, afin de mieux percer ce secret, le point de vue analytique du mode d’investigation se bascule en mode d’exposition synthétique et la processualité chimique cède le pas au procédé alchimique : c’est que « le capitaliste, en transformant l’argent en marchandises qui servent d’éléments matériels d’un nouveau produit, en leur incorporant (…) la force de travail vivant, transforme la valeur (…) en capital, monstre animé qui se met à travailler comme s’il avait le diable au corps ». Cette discursivité du Capital se déchiffre comme intertexte. La dernière citation emprunt et inverse un vers de Faust : « Que s’il avait l’amour au corps ». L’amour, lien véritable, se renverse en diabolus, ce qui désunit. Ce renversement étant lui-même conforme à cet autre vers exprimant l’idée de la perte du lien processuel dans le passage de l’analyse à la synthèse : « Elle se moque d’elle-même (…), elle a les parties dans sa main, il ne lui manque (…) que le lien spirituel ». En outre, Le Capital suit l’idée générale des Affinités électives, roman dans lequel Goethe analyse les relations sociales suivant un modèle chimique où l’amour et l’amitié se révèlent comme liens véritablement humaines. N’est-ce pas Le Capital qui empruntait à des œuvres théâtrales et littéraires son versant théorique avant même que celles-ci ne le lui empruntent ? [less ▲]

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See detailAurorae on Mars
Ritter, Birgit ULiege; Gérard, Jean-Claude ULiege; Hubert, Benoît ULiege et al

Conference (2018, February)

Three kinds of UV aurora have been detected on Mars: the discrete aurora [1], the diffuse aurora [2], and the proton aurora [3]. The discrete and the diffuse aurora are seen on the Martian nightside and ... [more ▼]

Three kinds of UV aurora have been detected on Mars: the discrete aurora [1], the diffuse aurora [2], and the proton aurora [3]. The discrete and the diffuse aurora are seen on the Martian nightside and result from electron impact on the upper atmosphere. Figure 1 shows an electron excited auroral spectrum extended into the visible using laboratory measurements. The proton aurora is observed on the dayside and originates from precipitating protons. We present an overview of these aurorae, combining observations of the SPICAM ultraviolet spectrometer on board Mars Express and modeling results, giving an estimate of what we might be able to observe in the future with UVIS-NOMAD [4] on board Trace Gas Orbiter (TGO). [less ▲]

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See detailPliny the Elder: which language for which science?
Fantoli, Margherita ULiege

Conference (2018, February)

The lack of vocabulary and structures of Latin for scientific writing is well known and a widely discussed issue. The solutions found by each author give a hint into their conception and approach to the ... [more ▼]

The lack of vocabulary and structures of Latin for scientific writing is well known and a widely discussed issue. The solutions found by each author give a hint into their conception and approach to the subject treated. This is the case of Pliny the Elder, whose language has been criticized for a long time as “bad Latin” (since Norden’s harsh judgment in his Die antike Kunstprosa), while recent studies have highlighted how certain particularities of Pliny’s prose can be explained in the light of the particular necessities of his work. This paper’s aim is to discuss the language and style employed by Pliny the Elder in the second book of his Naturalis Historia (Astronomy). Thanks to the combination of statistical data (obtained thanks to the lemmatization and morphosyntactic tagging of this book) and traditional stylistic and linguistic analysis, it is possible to gain some precise information on the most outstanding characteristics of Pliny’s astronomical language (largely nominal, lacking of subordination, cumulating specific particles), and, successively, to interpret them. In particular, the focus is on the section dealing with ‘comets' (XXII-XXXVII). The comparison to analogous sections in the Aristotle’s Meteorology and Seneca’s Naturales Quaestiones helps to point out the most specific features of Pliny’s prose. [less ▲]

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