References of "Scientific congresses and symposiums"
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See detailLe patient, le médecin de famille et la SNOMEDISATION de l’information de santé
Jamoulle, Marc ULg

Conference (2016, May 19)

Some thoughs of a practicing family doctor on the recent evolution of terminological field in health care and the marketing of medicine

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See detailImproving pose estimation by building dedicated datasets and using orientation
Azrour, Samir ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

Poster (2016, May 19)

Markerless pose estimation systems are useful for various applications including human- computer interaction, activity recognition, security, gait analysis, and computer-assisted medical interventions ... [more ▼]

Markerless pose estimation systems are useful for various applications including human- computer interaction, activity recognition, security, gait analysis, and computer-assisted medical interventions. They have attracted much interest since the release of low-cost depth cameras such as Microsoft’s Kinect camera. Shotton et al. and Girshick et al. pioneered tractable methods that infer a full-body pose reconstruction in real-time. Despite this technological breakthrough, the accuracy of human pose estimation from single depth images remains insufficient for some applications. Our work aims at building a simulation environment to create images databases suited for any camera position and improving the mainstream machine learning-based pose estimation algorithms. [less ▲]

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See detailElaboration et validation d’un questionnaire sur les règles en basket-ball
Van Hoye, Martin; Cloes, Marc ULg; Dauby, Lionel et al

Conference (2016, May 19)

Le règlement en basket-ball est très complexe. Il exige beaucoup d’interprétations et une bonne connaissance des nombreuses règles. Leur méconnaissance est considérée comme une origine possible des ... [more ▼]

Le règlement en basket-ball est très complexe. Il exige beaucoup d’interprétations et une bonne connaissance des nombreuses règles. Leur méconnaissance est considérée comme une origine possible des contestations des décisions arbitrales. Il s’avère donc intéressant de déterminer le niveau de maitrise des règles chez les acteurs du basket-ball. Pour ce faire, il est nécessaire de disposer d’un outil permettant d’interroger aussi bien les joueurs, les entraineurs, les arbitres que toute autre personne gravitant autour de ce sport. Nous avons dès lors décidé de créer un questionnaire sur base d’interviews réalisées auprès d’experts et de le tester grâce à la collaboration de 18 étudiants en Sciences de la Motricité spécialistes du basket-ball. Tant la participation des experts que les informations collectées lors de l’étude pilote soulignent l’intérêt de l’instrument que nous avons développé (rapidité d’utilisation, clarté, caractère discriminant des réponses). [less ▲]

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See detailEvolution récente du trait de côte dans le Golfe de Guinée : Exemples du Togo et du Bénin
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; de Longueville, Florence

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

L’interface terre-mer est un environnement extrêmement fragile. De par le monde, les littoraux sont menacés par une multitude de facteurs parfois naturels et le plus souvent anthropiques. Ainsi, aux ... [more ▼]

L’interface terre-mer est un environnement extrêmement fragile. De par le monde, les littoraux sont menacés par une multitude de facteurs parfois naturels et le plus souvent anthropiques. Ainsi, aux perturbations locales occasionnées aux zones côtières par les infrastructures portuaires, les barrages, les prélèvements de sédiments à même la plage ou encore l’extension urbaine, s’ajoutent les conséquences globales des changements climatiques, dont l’élévation certaine du niveau des océans et l’amplification probable de conditions météo-marines dévastatrices. Cet article évalue la récente évolution du trait de côte au Togo et au Bénin où plusieurs études localisées démontrent que les plages sableuses connaissent des modifications (accumulation ou érosion) majeures ces dernières décennies. Dans le but d’avoir une vision globale de la dynamique côtière sur les 170 kilomètres de plages de ces deux pays d’Afrique de l’Ouest, des images satellitaires à haute définition spatiale disponibles en open access sur Google Earth sont utilisées de manière diachronique. [...] [less ▲]

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See detailImpact de la vulnérabilité et de la résilience aux changements environnementaux sur la mobilité en Afrique de l'Ouest
Zickgraf, Caroline ULg; Vigil Diaz Telenti, Sara ULg; de Longueville, Florence et al

in Ginesu, Sergio; Ozer, André; Ozer, Pierre (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques (2016, May 19)

Du Sahel à la zone côtière, l’Afrique de l'Ouest connaît une variété de changements environnementaux résultant tant de processus lents que de chocs soudains. Ces changements influencent significativement ... [more ▼]

Du Sahel à la zone côtière, l’Afrique de l'Ouest connaît une variété de changements environnementaux résultant tant de processus lents que de chocs soudains. Ces changements influencent significativement les schémas de migration de populations dans et hors de l'Afrique de l'Ouest. Dans cette région où les ressources naturelles constituent la base des moyens de subsistance et de la sécurité alimentaire (pêche et agriculture), la relation entre les changements environnementaux et les vulnérabilités socio-économiques est particulièrement préoccupante. [...] [less ▲]

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See detailGestion du risque d’érosion côtière en Côte d’Ivoire : Cas du déguerpissement dans la commune de Port-Bouët à Abidjan
Comoe, Raymond; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

L’Etat de Côte d’Ivoire a décidé, depuis 2011, de faire déguerpir les populations des zones à risques du District Autonome d’Abidjan afin de réduire les impacts des catastrophes naturelles. La dernière ... [more ▼]

L’Etat de Côte d’Ivoire a décidé, depuis 2011, de faire déguerpir les populations des zones à risques du District Autonome d’Abidjan afin de réduire les impacts des catastrophes naturelles. La dernière vaste opération de déguerpissement concerne l’assainissement du littoral dans la commune de Port-Bouët menacé, selon les autorités, par l’avancée de la mer. [...] [less ▲]

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See detailCharacterization of the low-mass companion around HD 142527 with VLT/SINFONI
Christiaens, Valentin ULg; Casassus, Simon; Absil, Olivier ULg et al

Conference (2016, May 19)

The circumstellar disk of the Herbig Fe star HD 142527 is host to several remarkable features in the context of planetary formation, including a warped inner disk, one of the largest annular gaps, a ... [more ▼]

The circumstellar disk of the Herbig Fe star HD 142527 is host to several remarkable features in the context of planetary formation, including a warped inner disk, one of the largest annular gaps, a prominent dust trap and several spiral arms in its outer disk. A low-mass companion, HD 142527 B, was also found orbiting the primary star at only ~10 au, possibly shaping the inclined inner disk (inclined with respect to the outer disk). This study aims to provide a clarifying answer to the question of the true nature of this companion, which could help explaining its true impact on the peculiar geometry of the disk. We observed the source with VLT/SINFONI in H+K band in pupil-tracking mode. Data were then post-processed with several principal component analysis algorithms based on the principle of Angular Differential Imaging. HD 142527 B is re-detected in most of the H+K spectral channels at a signal-to-noise ratio > 3. This re-detection enables us to extract the first medium-resolution spectrum of a low-mass companion at less than 0.1'' from its central star. The best fit to our spectrum was obtained with a BT-SETTL model spectrum corresponding to a temperature of 3400+-50K and a surface gravity log(g)=2.5+-1.0. Using pre-main sequence tracks, this corresponds to an M3 star with a mass, radius and age of M_B ~0.3 M_Sun, R_B ~ 1.1 R_Sun and 3.6 Myr old, respectively. We also suggest that most of the expected circum-secondary material is at a temperature lower than 1000K, hence not emitting in H and K band, but able to explain the excess measured at L- and M-bands. Based on the new values of radius and mass of the companion, we provide a new estimate for the mass accretion rate on HD 142527 B of ~1% of the accretion rate on the primary, consistent with a non-significant detection in the Brackett-gamma line. This result confirms the efficiency of the pupil-tracking mode implemented on VLT/SINFONI for the spectral characterization of faint companions orbiting very close to their star. [less ▲]

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See detailAnalyse de la transition entre l'enseignement secondaire et l'enseignement supérieur chez des sportifs de haut niveau
Theunissen, Catherine ULg; Bolaers, Nathan; Cloes, Marc ULg

Conference (2016, May 19)

La transition entre les études secondaires et supérieures représente une période charnière pour les sportifs de haut niveau qui s’engagent dans un double projet de vie, sportif et scolaire. La présente ... [more ▼]

La transition entre les études secondaires et supérieures représente une période charnière pour les sportifs de haut niveau qui s’engagent dans un double projet de vie, sportif et scolaire. La présente étude analyse le ressenti de 103 jeunes, reconnus officiellement par la Fédération Wallonie-Bruxelles (Belgique), à propos de cette période critique. Les résultats montrent que 11% ont abandonné leur pratique sportive pour se consacrer à leurs études, 73% pensent que les aménagements sont mieux organisés dans le secondaire que dans le supérieur, avec de fortes disparités en fonction des établissements scolaires. Étonnamment, 43% mentionnent ne pas avoir reçu d’informations concernant les aménagements possibles. Une diminution de 27% du nombre de statuts octroyés après cette année de transition est également observée. Un projet basé sur la continuité des démarches et des aménagements semble nécessaire pour aider ces étudiants-sportifs à mener à bien leur double vie. [less ▲]

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See detailPlace des pertes et préjudices liés aux changements climatiques dans les accords internationaux
Perrin, Dominique ULg; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

Pour les pays les plus vulnérables, les « pertes et préjudices » (traduit de l’anglais « Loss and damage ») causés par les changements climatiques sont une question cruciale. Il n’existe pas de définition ... [more ▼]

Pour les pays les plus vulnérables, les « pertes et préjudices » (traduit de l’anglais « Loss and damage ») causés par les changements climatiques sont une question cruciale. Il n’existe pas de définition convenue des « pertes et préjudices », mais l’expression fait globalement référence à toute une série de dommages subis en raison du changement climatique et ne pouvant pas être évités par des efforts d’atténuation ou d’adaptation. La question est devenue l’un des principaux enjeux de la conférence des parties (COP) à la Convention-cadre des Nations Unies sur les changements climatiques (CCNUCC). Le récent « Accord de Paris » adopté en décembre 2015 lors de la COP21 de la CCNUCC a ouvert de nouvelles pistes pour la prise en considération de cette question. L’objectif de cet exposé introductif au colloque est bien de dresser un état des lieux complet sur les enjeux complexes liés à la prise en compte des « pertes et préjudices », tant sur les aspects scientifiques relevés par le Groupe d'experts intergouvernemental sur l'évolution du climat (GIEC) que sur les aspects économiques, sociaux et géopolitiques. [less ▲]

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See detailLa responsabilité climatique dans les défis urbains contemporains: évaluation et mise en contexte pour la ville de Bujumbura, Burundi
Nibigira, Léonidas; Ozer, Pierre ULg; Havenith, Hans-Balder ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

A Bujumbura, la capitale du Burundi, les préjudices liés aux risques naturels deviennent de plus en plus une réalité quotidienne. Les cas les plus ressentis sont ceux liés aux inondations, aux glissements ... [more ▼]

A Bujumbura, la capitale du Burundi, les préjudices liés aux risques naturels deviennent de plus en plus une réalité quotidienne. Les cas les plus ressentis sont ceux liés aux inondations, aux glissements de terrain et à l'érosion. Les épidémies relatives aux conditions sanitaires précaires deviennent de plus en plus récurrentes. [...] [less ▲]

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See detailLe lock-out de Verviers en 1906 vu par Léon de Seilhac
Geerkens, Eric ULg

Conference (2016, May 19)

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See detailVers une ‘école qui bouge’ : identification des initiatives visant à promouvoir l’activité physique dans l’enseignement primaire
Cloes, Marc ULg; Dell'Amico, Vincent; Delfosse, Catherine ULg et al

Poster (2016, May 19)

L’école représente un des piliers essentiels de la promotion de l’activité physique mais il apparaît que nombre d’établissements ne sont pas conscients des actions qu’ils pourraient aisément mettre en ... [more ▼]

L’école représente un des piliers essentiels de la promotion de l’activité physique mais il apparaît que nombre d’établissements ne sont pas conscients des actions qu’ils pourraient aisément mettre en place dans cette perspective. Nous avons conçu un site internet présentant notamment des exemples d’initiatives de promotion d’activité physique et des recommandations pour la santé. Huit écoles primaires en ont reçu une copie et, pendant une période de 5 semaines, ont été invitées à y publier un minimum de 12 initiatives propres. Des contacts réguliers ont été établis entre les chercheurs et les praticiens. L’objet de cette recherche consiste à analyser l’exploitation du site par ces derniers. A la fin de l’étude, 4 écoles déclarent vouloir continuer à exploiter les données du site l’année suivante et 4 ont l’intention de s’inspirer des actions échangées à l’issue de l’expérience. Sept établissements estiment qu’il serait judicieux d’utiliser leur site comme un moyen de propagande. [less ▲]

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See detailDémarrage et longueur de la saison de pluies dans la région de Kinshasa et risques induits
Makanzu Imwangana, Fils; Phuati, Giscard; Ozer, Pierre ULg et al

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

La détermination et la prévision du démarrage de la saison de pluies sont des questions cruciales à travers la RDC en général et en particulier dans l’hinterland de la ville de Kinshasa étant donné que ... [more ▼]

La détermination et la prévision du démarrage de la saison de pluies sont des questions cruciales à travers la RDC en général et en particulier dans l’hinterland de la ville de Kinshasa étant donné que l’agriculture y est pluviale. Elles permettent de déterminer le calendrier agricole, particulièrement le semis, et influence le rendement. La question qui se pose toujours est celle de savoir s’il y a un changement climatique dans la région de Kinshasa qui se traduirait par la variation de la saison des pluies de 1961 à 2010. Et si c’est le cas, quels en sont les impacts sur l’activité agricole et autres ? Cette étude mène une analyse de la variabilité interannuelle et décennale de la saison des pluies à partir de deux séries chronologiques dans la région de Kinshasa. [...] [less ▲]

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See detailCap-Haïtien ou comment construire le risque d’inondations en une décennie.
Gracius, Gracia Joseph; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

Cap-Haïtien, ville située au Nord d’Haïti, connait une multiplication sans précédent des inondations. Alors que certains observateurs sont tentés de blâmer les conséquences du changement climatique, nous ... [more ▼]

Cap-Haïtien, ville située au Nord d’Haïti, connait une multiplication sans précédent des inondations. Alors que certains observateurs sont tentés de blâmer les conséquences du changement climatique, nous tentons ici de démontrer que l’absence totale d’aménagement du territoire, la dégradation de l’environnement, l’inexistence de bonne gouvernance et l’exode rural sont les principaux ingrédients de la création d’un risque jadis exceptionnel. Cette recherche a pour objectif d’analyser l’évolution de l’extension urbaine dans deux milieux humides (la rivière Haut-du-Cap et la mangrove à Petite-Anse) de 2004 à 2016 et d’évaluer la perception du risque d’inondation par les populations locales. [...] [less ▲]

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See detailAperçu historique de la communauté Yézidie
Bayramzadeh, Kamal ULg

Conference (2016, May 19)

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See detailDas unglückliche Bewusstsein als kritischer Begriff der Modernität. Eine unterirdische Quelle der französischen Philosophie
Petteni, Oriane ULg

Conference (2016, May 19)

The idea is to re-evaluate the impact of Jean Wahl's book "Le malheur de la conscience dans la philosophie de Hegel" upon the french philosophy and to show how this specific figure help us to build ... [more ▼]

The idea is to re-evaluate the impact of Jean Wahl's book "Le malheur de la conscience dans la philosophie de Hegel" upon the french philosophy and to show how this specific figure help us to build bridges between politics, economic and epistemology. [less ▲]

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See detailLe game design en amateur : Ni convergent ni divergent
Hurel, Pierre-Yves ULg

Conference (2016, May 18)

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See detailConceptualisation de l’espace public dans la Théorie critique
Glorie, Caroline ULg

Conference (2016, May 18)

Mon projet de recherche consiste en une étude généalogique et critique des conceptualisations de l’espace public qu’on peut trouver dans la Théorie critique. Il vise à problématiser les formes du public à ... [more ▼]

Mon projet de recherche consiste en une étude généalogique et critique des conceptualisations de l’espace public qu’on peut trouver dans la Théorie critique. Il vise à problématiser les formes du public à l’aide de Walter Benjamin, Oskar Negt et Hans-Magnus Enzensberger. Je procéderai selon deux axes. Premièrement, il s’agira de réaliser une généalogie philosophique du concept d’espace public d’après la Théorie critique de Benjamin, Negt et Enzensberger. D’une part, une telle généalogie doit être effectuée en regard du concept habermassien d’espace public, en particulier en ce qui concerne la problématisation negtienne d’un espace public oppositionnel. D’autre part, cette étude ne pourra être réalisée sans une attention aux formes et conceptualisations historiques de l’espace public au cours des XIXème et XXème siècles : les salons littéraires, la presse, le développement de la radio, etc. Dans le cadre du projet ARC « Humanités critiques », une attention particulière sera accordée à la forme revue qui, chez les trois auteurs concernés, peut être considérée comme un lieu primordial de théorisation et de conceptualisation de l’espace public. Deuxièmement, sur la base de cette autre lignée de la Théorie critique, il s’agira de construire une problématisation de l’espace public. Mon hypothèse est la suivante : l’approche critique proposée par Benjamin, Negt et Enzensberger consiste à prendre en considération une dialectique toujours à l’œuvre entre différents espaces publics, ainsi qu’entre des formes hétérogènes qu’ils peuvent prendre. [less ▲]

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See detailDébats autour du concept de type en typologie des langues
Lttr13; Badir, Sémir ULg; Polis, Stéphane ULg et al

Conference (2016, May 18)

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See detailEthane rise associated with North American oil and gas exploitation
Franco, Bruno ULg; Mahieu, Emmanuel ULg; Emmons, Louisa et al

Conference (2016, May 18)

Ethane (C2H6) is mainly emitted in the atmosphere from leakage during production and transport of natural gas, biofuel consumption and biomass burning. As it shares concurrent anthropogenic emission ... [more ▼]

Ethane (C2H6) is mainly emitted in the atmosphere from leakage during production and transport of natural gas, biofuel consumption and biomass burning. As it shares concurrent anthropogenic emission sources with methane (CH4), a better understanding of the atmospheric distribution of C2H6 and any trends in its abundance can be used to better constrain the sources of CH4 from oil and gas activities. Until very recently, the C2H6 abundance in the atmosphere has been declining due to the reduction of fugitive emissions as a result of air pollution abatement measures. However, a renewal of the atmospheric C2H6 burden has been detected over North America and Europe from 2009 onwards. It is attributed to the unprecedented growth in the exploitation of shale gas and tight oil reservoirs in North America. Using time series of C2H6 abundance derived from ground-based high-resolution infrared solar absorption spectra recorded at complementary NDACC FTIR sites, we present here sharp C2H6 rises in the Northern Hemisphere, of up to 5 %/yr since 2009. Using model simulations, we show that the HTAP2 bottom-up inventories for anthropogenic emissions greatly underestimate the observed pre-increase C2H6 abundances and that they are too low by a factor two. We also evaluate new top-down emissions of C2H6 from the North American oil and gas activities, biofuel consumption and biomass burning, derived from space-borne observations of CH4 from GOSAT. We find a good agreement with the observations at the North American mid-latitudinal sites, close to regions with high drilling productivity, but an overestimation at remote sites. We also estimate that the North American C2H6 emissions have increased by 75% over the past six years (2009-2014), annihilating the benefits of more than two decades of successful anthropogenic emission reduction, and that the associated annual CH4 emissions from the North American oil and gas sector grew from 20 to 35 Tg/yr over the same period. [less ▲]

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See detailL'ordinateur dans la littérature allemande au tournant du millénaire
Dupont, Bruno ULg

Poster (2016, May 18)

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See detailAnticoherence of spin states with point-group symmetries
Baguette, Dorian ULg; Damanet, François ULg; Giraud, Olivier et al

Poster (2016, May 18)

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See detailA Reversal of Long-term Global Trends in Atmospheric Ethane and Propane from North American Oil and Natural Gas Emissions
Helmig, D.; Rossabi, S.; Hueber, J. et al

Conference (2016, May 18)

Ethane, the longest-lived and most abundant non-methane hydrocarbon (NMHC) peaked in the background atmosphere around 1970. This was followed by a ~20% reduction of the atmospheric burden and a resulting ... [more ▼]

Ethane, the longest-lived and most abundant non-methane hydrocarbon (NMHC) peaked in the background atmosphere around 1970. This was followed by a ~20% reduction of the atmospheric burden and a resulting atmospheric downward trend for the next four decades, mostly due to reduced emissions from oil and gas industries and stricter air quality controls. Here, we show that the near 40-year trend of declining global ethane halted between 2005-2010 in most of the Northern Hemisphere (NH), and that since it has reversed. The largest increases in ethane and of the shorter-lived propane are seen in the central and eastern U.S. and immediately downwind, identifying this region as the primary source of increased NMHC emissions. The spatial distribution of observed concentration increases for ethane and propane provides convincing evidence that renewed emissions are primarily associated with the growth of oil and natural gas development in North America. Using source region relationships, emission estimates for increases of co-emitted NMHCs and methane, as well as impacts on tropospheric ozone production have been developed. [less ▲]

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See detailChaotic Bohmian trajectories for stationary states
Cesa, Alexandre ULg; Martin, John ULg; Struyve, Ward

Poster (2016, May 18)

We study the possibility of chaos for the Bohmian dynamics when the wave function is stationary. Examples of stationary wave functions are given for which there is chaos, as demonstrated by numerical ... [more ▼]

We study the possibility of chaos for the Bohmian dynamics when the wave function is stationary. Examples of stationary wave functions are given for which there is chaos, as demonstrated by numerical computations, for one particle moving in 3 spatial dimensions and for two and three entangled particles in 2 dimensions. What is important for the amount of chaos is the overall complexity of the wave function. Some simple measures that partly capture the complexity of the wave function are considered: the participation ratio and different measures of entanglement. We find that these measures often tend to correlate to the amount of chaos. However, the correlation is not perfect, because the measures do not depend on the intrinsic complexity of the states of a given basis. [less ▲]

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

Poster (2016, May 18)

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

We study the one-dimensional (1D) transport properties of an ultracold gas of Bose-Einstein condensed atoms through Aharonov-Bohm (AB) rings. Our system consists of a Bose-Einstein condensate (BEC) that is outcoupled from a magnetic trap into a 1D waveguide which is made of two semi-infinite leads that join a ring geometry exposed to a synthetic magnetic flux φ. We specifically investigate the effects both of a disorder potential and of a small atom-atom contact interaction strength on the AB oscillations. The main numerical tools that we use for this purpose are a mean-field Gross-Pitaevskii (GP) description and the truncated Wigner (tW) method. We find that a correlated disorder suppress the AB oscillations leaving thereby place to weaker amplitude, half period oscillations on transmission, namely the Aronov-Al’tshuler-Spivak (AAS) oscillations. The competition between disorder and interaction leads to a flip of the transmission at the AB flux φ = π. This flip could be a possible preliminary signature of an inversion of the coherent backscattering (CBS) peak. Our study paves the way to an analytical description of the inversion of that peak. [less ▲]

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See detailAnalyse de l'implantation d'une approche de formation interactive à destination des entraîneurs de football
Theunissen, Catherine ULg; Lombard, Gilles ULg; Cloes, Marc ULg

Conference (2016, May 18)

Les méthodes qui aident à la formation des entraîneurs sont en perpétuelle remise en question. Intéressée par les méthodes interactives diffusées par l’Association Canadienne des Entraîneurs (ACE ... [more ▼]

Les méthodes qui aident à la formation des entraîneurs sont en perpétuelle remise en question. Intéressée par les méthodes interactives diffusées par l’Association Canadienne des Entraîneurs (ACE), l’Association des Clubs Francophones de Football (Belgique) a choisi de tester la mise en place d’une approche similaire au sein de sa formation des cadres. Pour évaluer la pertinence du projet, plusieurs sources de données ont été utilisées : questionnaires pré- et post-formation pour les candidats, interviews et questionnaires de perception de séances pour les formateurs ainsi que des observations de terrain. Les résultats montrent que les formateurs ne semblent pas complètement à l’aise dans leur nouveau rôle de modérateur et délaissent les outils interactifs lorsqu’ils rencontrent un obstacle. De leur côté, les candidats sont séduits par ces nouvelles méthodes et jugent les résultats des travaux de meilleure qualité. Des adaptations concrètes sont proposées pour améliorer le système. [less ▲]

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See detailSuper- and subradiance from indistinguishable atoms with quantized motion
Damanet, François ULg; Braun, Daniel; Martin, John ULg

Poster (2016, May 18)

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See detailDevelopment of a hydrogen maser in the TE111 mode
Van Der Beken, Emeline ULg; Léonard, Daniel; Counet, Arnaud et al

Poster (2016, May 18)

We present the recent progress in the development of a hydrogen maser in the unusual TE111 mode. In contrast to standard hydrogen maser that exploits the TE011 mode, the TE111 mode allows one to design ... [more ▼]

We present the recent progress in the development of a hydrogen maser in the unusual TE111 mode. In contrast to standard hydrogen maser that exploits the TE011 mode, the TE111 mode allows one to design hydrogen masers with significant reduced dimensions which represents a huge benefit for space applications and in particular for the global positioning system. We present in details the different parts of our model : cavity with a thin Teflon sheet, magnetic shielding, temperature control of the maser... [less ▲]

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See detailCharacterization and biocontrol properties of Lactuca sativa rhizosphere microbiota in an aquaponic system
Stouvenakers, Gilles ULg; Massart, Sébastien ULg; Jijakli, Haissam ULg

Poster (2016, May 17)

Aquaponics is an integrated recirculated system that combines aquaculture and hydroponic plant production. The dissolved nutrients generated by the fish rearing after bacterial activities are used by the ... [more ▼]

Aquaponics is an integrated recirculated system that combines aquaculture and hydroponic plant production. The dissolved nutrients generated by the fish rearing after bacterial activities are used by the plants for their growth. This uptake reduces the accumulation of some molecules which allow a longer water recirculation. When comparing growth conditions between aquaponics and hydroponics, we observed much lower concentration of several key nutrients in aquaponics. Nevertheless, several experimentations report similar or better yield in aquaponics compared with hydroponics. One explanation of this phenomenon could be linked to microbial actions. Nowadays, microorganisms related to aquaculture and hydroponics are well characterized but very little is known about the microbiota associated with aquaponic system. The first aim of this study is to characterize the rhizosphere microbiota (metagenomics) of lettuces growing in an aquaponics system. A NGS approach targeting the 16S rDNA will be carried out to evaluate the bacterial composition and diversity. The second aim is to assess the resistance of aquaponics lettuces following a pest introduction. Yields, symptoms and microbial changes due to the pest will be recorded and analysed to determine if aquaponics systems provide a better plant protection than hydroponics. Depending on the results, the final steps will be to identify the optimal conditions for the management of the potential beneficial microbiota or isolate a beneficial microorganism. [less ▲]

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See detailInsights gained from metagenomic sequencing of apple fruit surface (cv. Pinova)
Angeli, Dario; Massart, Sébastien ULg; Sare, Abdoul Razack ULg et al

Poster (2016, May 17)

Plant microbial communities (microbiota) living at the surface of fruit have been the source of the majority of biocontrol agents (BCAs). Despite this interest, their role as a community has been poorly ... [more ▼]

Plant microbial communities (microbiota) living at the surface of fruit have been the source of the majority of biocontrol agents (BCAs). Despite this interest, their role as a community has been poorly studied so far. They holistic study was an unattainable objective due to the absence of techniques to survey microbial communities and their evolution. The recent developments in high-throughput sequencing (HTS) have now enabled the holistic analysis of the microbiota genomes. A pioneering assay has been carried out to get insight into the microbiota of apple surface through metagenome sequencing. Apple from Pinova cultivar have been sampled in orchard and the microbiota isolated. After DNA extraction, the HTS assay generated 14.5 Gbases which were assembled in 133,888 contigs. These contigs provided useful information on taxonomic composition of the microbiota. A total of 1398 bacterial species and 397 fungal species have been identified. Among them, 22 species corresponded to known apple pathogens (Penicillium expansum, Penicillium spp, Botrytis cinerea, Monilinia fructicola, Nectria haematococca, Glomerella cingulate, G. graminicola, Alternaria alternate, Alternaria brassicicola, A. citri, A. longipes, A. solani, A. tenuissima, Fusarium solani, F. oxysporum, F. culmorum, F. lateritium, Mucor circinelloides, M. hiemalis, F. racemosus, Venturia inaequalis, Cladosporium cladosporioides). In addition, several contigs were assigned to species or genus of known BCA strains like Pichia canadensis, Bacillus sp., Debaryomyces hansenii, Aureobasidium pullulans and Pantoea vagans. These results will be discussed. In any case, these results underline a very diverse microbial community whose role needs to be characterized. In this line, the functional analysis (gene function determination) of the contigs is ongoing. [less ▲]

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See detailHerbicidal activity of Tunisian plant extracts against various weeds
Ben Kaab, Sofiène ULg; Parisi, Olivier ULg; Ksouri, Riadh et al

Conference (2016, May 17)

In agricultural systems, weeds can dramatically reduce crop yields (by the constant competition for water and nutrients) and interfere with plant functions to suppress their growth causing huge economic ... [more ▼]

In agricultural systems, weeds can dramatically reduce crop yields (by the constant competition for water and nutrients) and interfere with plant functions to suppress their growth causing huge economic losses.Yield losses can reach up to 34% in crops. Plant extracts are known since a long time to have phytotoxicity potentialities and could be used as new natural compounds with bioherbicide activities. The study began with the selection of ten plant species suspected to be phytotoxic due to their wealth of phenolic, terpene and alcaloid compounds, such as flavonoids and phenolic acids coumarins. Then, three weeds were selected from Maghreb and European weeds as models (Phalaris minor, Sylibum marianum and Trifolium incanatum). Aerial plant materials were grounded and macerated with methanol for 24H. Methanol was then eliminated along rotavapor. The yield of plant extract varied between 5.29% and 29.71 % following the species. The essential oil was extracted by hydrodistillation using a Clevenger type apparatus (with a yield of 1.2%). Methanol extracts and the essential oil were then tested for their herbicidal activity in post-emergence assays against the three weeds species.The most active extracts were selected and formulated to increase their efficiency. Post-emergence bioassays consisted in spraying each extract at 3 concentrations (7500, 20000 and 340000 ppm) at 2 leaves stage . Pelargonic acid was used as commercial positive control at 34000 ppm. After 7 days on incubation in greenhouses, results showed that E6, presented poor phytotoxicity against three weeds at 7500 and 20000 ppm. However, E6 caused total wilting and several leaf blight against Phalaris minor and Trifolium incanatum and sever necrosis against Sylibum marianum. At that higher concentration of 34000 ppm. , the extracts E3 and E8 and the essential oil appeared also phytotoxic. The three extracts and the essential oil were selected for the formulation. After formulation to enhance the distribution, the coverage and the penetration of the active molecules at 34000 ppm, E3, E6, E8 and essential oil presented a high herbicidal activity compared with the extracts without formulation. E6 with the formulation has completely punctured Trifolium incanatum and suppressed growth of Phalaris minor and Sylibum marianum. The results of this study reveal that plant extracts, after formulation, are more effective in inhibiting weed growth. The strong weed suppressive ability of formulated E6 therefore offers interesting possibilities as an effective natural environment-friendly approach for weed management. [less ▲]

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See detailMonstres et images : premiers pas vers une redéfinition de la monstruosité cinématographique
Jousten, Lison ULg

Conference (2016, May 17)

La communication propose un déplacement du monstre en tant qu’objet filmé pour l’envisager en tant que forme filmique. Cette hypothèse est avancée puis expérimentée par le biais d'une étude de cas.

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See detailInfluence of the balls kinematics and ball/race contact models on quasi-static approaches for ball bearing
Servais, Christophe ULg; Bozet, Jean-Luc ULg

Conference (2016, May 17)

The frictional power dissipated within dry lubricated ball bearings is a prime concern, especially for high speed applications. Nevertheless, the exact balls behavior is still a source of interrogations ... [more ▼]

The frictional power dissipated within dry lubricated ball bearings is a prime concern, especially for high speed applications. Nevertheless, the exact balls behavior is still a source of interrogations. Firstly, a comparison of several ball/race contact models has been performed by prescribing the kinematical variables. This has been done by using an existing quasi-static approach to reach the ball bearing equilibrium. Secondly, a parametric study has been carried out on the ball kinematics. This time the contact model remained fixed. The results demonstrate the predominance of the kinematics on the ball bearing behavior with an emphasis on the dissipated power within ball/race contacts. This shows that the kinematics must be rightly computed. On the other hand, the ball/race contact model doesn’t necessitate a high refinement in order to evaluate the ball bearing equilibrium. Conversely, this refinement is essential for a precise evaluation of the power losses. [less ▲]

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See detailCan tropical basil be integrated in vegetable crop pest management?
Yarou, Boni Barthélémy ULg; Verheggen, François ULg; Heuskin, Stéphanie ULg et al

Poster (2016, May 17)

To address human and environmental health issues related to the use of synthetic pesticides, it is important to explore other ecological pest management approaches. Within this context, a study was ... [more ▼]

To address human and environmental health issues related to the use of synthetic pesticides, it is important to explore other ecological pest management approaches. Within this context, a study was conducted to evaluate the toxic and repellent effect of Ocimum gratissimum L. (Lamiaceae) on Myzus persicae S. (Aphididae). The toxicity of O. gratissimum essential oil (EO) was evaluated on M. persicae comparing 3 concentrations (0.001%; 0.01% and 0.1%) to a control (15% sucrose). Mortality rate and fecundity were assessed for each concentration. The observations were made daily, for 4 days, on 12 replicates per treatment. To test the repellent effect of O. gratissimum plants, 2 treatments were compared: a group of 8 Amaranthus cruentus L. (Amaranthaceae) plants with 1 plant of O. gratissimum in the middle and a group of 9 A. cruentus plants (control). The distribution of aphids was analyzed 12 days after the middle plant infestation (20 aphids per plant) for each treatment (6 replicates per treatment). O. gratissimum EO was found toxic from a concentration of 0.01%, with a mortality rate of 34% versus 12% for the control ; The fecundity felt from 30 larvae after 4 days (control) to 15 larvae for the 3 doses of the EO. The analysis with the generalized linear mixed model with Poisson error distribution followed by Turkey test (5 %) showed that EO is significantly more toxic than the control, both for mortality and fecundity (p <0.001). In association test, the population of M. persicae (15 aphids per plant) was significantly (p<0,001) lower when A. cruentus plants was associated with O. gratissimum plant than with the control (22 aphids per plant). Furthermore, the population increases gradually as one moves away from the infestation point in association test whereas it decreases in the control. With regards to these results, it appears that O. gratissimum has biocide effects on M. persicae. This plant may be used in an integrated pest management strategy in the production of vegetable to reduce the use of synthetic pesticides and avoid chemicals residues. [less ▲]

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See detailDevelopment of a semiochemical-based control method against the walnut husk fly
Sarles, Landry ULg; Heuskin, Stéphanie ULg; Verheaghe, Agnès et al

Conference (2016, May 17)

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See detailNew elicitors to protect wheat against Zymoseptoria tritici: biocontrol tools for IPM strategies
Le Mire, Géraldine ULg; SIAH, Ali; BRISSET, Marie-Noëlle et al

Conference (2016, May 17)

Elicitors are increasingly considered as promising biocontrol tools in the preventive treatment of plants against various diseases. These plant-immunity triggering compounds, also called “stimulators of ... [more ▼]

Elicitors are increasingly considered as promising biocontrol tools in the preventive treatment of plants against various diseases. These plant-immunity triggering compounds, also called “stimulators of plant natural defenses”, induce a general and systemic resistance of the plant to a large spectrum of biotic stresses. Today, focus is made on the crucial protection of wheat, as one of the most cultivated crop plants in the world. This crop is constantly challenged by a persistent and harmful fungus known as Zymoseptoria tritici, responsible of the Septoria Tritici Blotch (STB) disease. Control of this disease mainly depends on phytosanitary products, and the social and economic importance of wheat make it all the more urgent to identify and develop new elicitors as biocontrol tools in wheat IPM strategies. This study focuses on the screening of nine molecules of various origins and structures for their potential eliciting properties to protect winter wheat against Zymoseptoria tritici. Three products were selected after screening trials in greenhouse conditions: EGL1, EGL4, and EGL5. They were efficient to reduce foliar disease symptoms from 40 to 80%. The biocide activity and phytotoxicity of these 3 products were evaluated directly towards the pathogen and the plant under laboratory and greenhouse conditions, respectively. On the other hand, the triggered signaling pathways were investigated by studying the activity of the defense-related enzymes lipoxygenase (LOX), peroxidase (POX) and phenylalanine ammonia-lyase (PAL) in treated wheat leaves. In addition, the expression of five defense genes (lox, pal, pox2, chi, pr1) was studied by qRT-PCR in wheat leaves treated with these elicitors and/or inoculated with Zymoseptoria tritici. The corresponding results will be presented and discussed, with the perspective to investigate the influence of environmental parameters on the elicitation capacity and the efficacy of the elicitors in field conditions. [less ▲]

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See detailVortex Image Processing (VIP) package for high-contrast direct imaging
Gómez González, Carlos ULg; Absil, Olivier ULg; Wertz, Olivier ULg et al

Poster (2016, May 16)

VIP is a Python instrument-agnostic toolbox featuring a flexible framework for reproducible and robust data reduction. VIP currently supports three high-contrast imaging observational techniques: angular ... [more ▼]

VIP is a Python instrument-agnostic toolbox featuring a flexible framework for reproducible and robust data reduction. VIP currently supports three high-contrast imaging observational techniques: angular, reference-star and multi-spectral differential imaging. The code can be downloaded from our git repository on Github: http://github.com/vortex-exoplanet/VIP [less ▲]

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See detailFUNCTIONAL SPECIFICATION METHODOLOGY FOR AN ARCHITECTURAL MODELER SUPPORTING A MODULAR CONSTRUCTIVE SYSTEM
Boulanger, Christelle ULg; Rahhal, Anabelle ULg; Delfosse, Vincent ULg et al

in Design2016 (2016, May 16)

This article presents a methodological approach which helped the software development of an architectural modeler that aims to support the life cycle of buildings with a modular construction system. The ... [more ▼]

This article presents a methodological approach which helped the software development of an architectural modeler that aims to support the life cycle of buildings with a modular construction system. The modeler assists the building composition processes, the production of useful documents like drawing plans, quantities and specifications, and the evaluation of the thermal performance of the building at any phase of its design. Conducted within a multidisciplinary team of architects engineers, computer engineers and ergonomists, this methodology is based on a constant interaction between the various skills, so that the different perspectives are systematically integrated into the decision process. The methodology is based on the analysis of three fields of functions (composition - production and evaluation) which are considered simultaneously through a theoretical framework stemming from ergonomics: Activity Theory [Engeström 1987]. At first, the software development context is presented. Then, the choice of the Activity Theory as a framework for the analysis will be motivated. The next section relates the multiple concepts of the methodology to each others, in order to identify the principles as well as the inputs and the outputs. Each step in its implementation is then described, followed by the results in terms of the software interface. Finally, the discussion that will follow will consider the contributions and limitations of this methodological approach in the understanding of a system, in order to offer an efficient IT support. [less ▲]

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See detailActivités d'intégration multidisciplinaire
Theunissen, Catherine ULg

Conference (2016, May 13)

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See detailLe concours d’habitations ouvrières du Tribouillet (1930) et la réception des théories de l’habitation minimum à Liège
Charlier, Sébastien ULg

Conference (2016, May 13)

En 1930, Liège et Anvers accueillent chacune une vaste exposition célébrant le centenaire de l’indépendance de la Belgique. À Liège, probablement sous l’impulsion de Victor Bourgeois, un concours ... [more ▼]

En 1930, Liège et Anvers accueillent chacune une vaste exposition célébrant le centenaire de l’indépendance de la Belgique. À Liège, probablement sous l’impulsion de Victor Bourgeois, un concours d’habitations ouvrières est organisé sur les hauteurs de la ville, dans le quartier du Tribouillet. L’événement est un moment fort de l’histoire de l’architecture à Liège, ville industrielle belge de seconde importance. Si l’essentiel du site, urbanisé selon le modèle de la cité-jardin, est occupé par des petites habitations unifamiliales sans innovations particulières, un secteur est réservé aux maisons dites « minimum ». Il y a, dans le chef des organisateurs, une volonté manifeste de s’inscrire dans la continuité des réflexions du CIAM 2 de Francfort et de faire écho aux « Journées de l’habitation minimum » présentées à Bruxelles en 1930. Des personnalités reconnues pour leur expertise en matière de logement public comme Victor Bourgeois, Louis Herman de Koninck, Fernand Bodson ou encore Joseph Moutschen sont invitées à présenter leurs conceptions du logement « moderne ». Notre contribution se propose, d’abord, de situer ces interventions dans la généalogie de la production de ces architectes en soulignant leurs particularités spatiales, constructives et esthétiques. Il s’agit également de montrer comment ces « phénomènes » ont influé sur la pratique locale, en particulier sur les jeunes architectes fascinés par les modèles internationaux, et comment ils furent reçus tant dans la maîtrise d’ouvrage privée que publique. Notre intervention montrera également en quoi l’expérience de 1930 fut un moment charnière dans les politiques locales de logement public. Car si l’historiographie reconnaît la portée du concours du Tribouillet, en tant que phénomène de spectacularisation locale et nationale des concepts du Mouvement moderne, elle oublie que l’événement marqua provisoirement la fin du recours au modèle de la cité-jardin à Liège. Écrasées par des charges de plus en plus lourdes, les sociétés de logement réinvestissent les centres urbains abandonnant le modèle de la petite maison unifamiliale au profit de l’immeuble à appartements. Une attention particulière sera également apportée au contexte culturel et au vif débat que connaît l’architecture à Liège dans l’entre-deux-guerres à travers l’analyse des revues locales et des expositions qu’elles organisèrent pour diffuser leurs modèles. [less ▲]

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See detailBildwissenschaft, l’image entre signe et perception (K. Sachs-Hombach)
Hagelstein, Maud ULg; Letawe, Céline ULg

Conference (2016, May 13)

« Une science générale de l’image n’a pas (encore) réussi à s’établir » (I, §1) . Face à ce constat, Sachs-Hombach suppose qu’il serait possible – et nécessaire – de définir un « cadre théorique commun » ... [more ▼]

« Une science générale de l’image n’a pas (encore) réussi à s’établir » (I, §1) . Face à ce constat, Sachs-Hombach suppose qu’il serait possible – et nécessaire – de définir un « cadre théorique commun » et un « programme de recherche intégratif » pour les différentes disciplines concernées par la science générale de l’image. « Par cadre théorique, je comprends un ensemble de formules qui résume les hypothèses communes de différentes théories » (I, §3) . Autrement dit, le travail de définition du cadre théorique implique que l’on dégage du commun, non pas au sens d’une métathéorie surplombante qui identifierait les « conditions constitutives » des théories spécifiques/particulières, mais au sens d’une description cartographique des lieux de croisement de ces théories – envisagées du point de vue de leur contenu (c’est-à-dire essentiellement : du point de vue des moyens conceptuels mobilisés). Les outils conceptuels de base doivent être décrits et expliqués, mais aussi légitimés (telle serait la tâche proprement philosophique d’une étude critique de la Bildwissenschaft). Bien entendu, la difficulté tient au fait qu’il existe une grande variété de concepts d’image (il faut pouvoir en tenir compte), ainsi qu’une multitude de modes d’accès disciplinaires à l’expérience iconique. Le cadre théorique doit pouvoir inclure tous les phénomènes liés à l’image – et se résout par conséquent aux seules caractéristiques générales. Etablir la cartographie des « concepts fondamentaux » constitue la tache philosophique par excellence et permet de s’orienter adéquatement dans un domaine : voir quels sont les instruments conceptuels à disposition et à quels problèmes potentiels ils s’attachent. Attention par « philosophie », il faut entendre non pas une discipline instituée mais une tâche systématique que toute science porte en elle (et que plusieurs agents peuvent bien entendu endosser, indépendamment de leur formation disciplinaire). Et la question qu’il s’agit de poser en priorité (c’est-à-dire : de poser encore, de maintenir, de relancer) : Qu’est-ce qu’une image / représentation iconique (représentation par l’image) ? (I, §6), quels types d’objets rencontrent les conditions définitoires minimales de l’image ? Quels types d’expérience définissent les limites de ce qu’on peut appeler l’expérience iconique ? Une fois les contours dessinés, la carte continue à nous offrir une infinité de positions possibles entre lesquelles nous pouvons nous déplacer. [less ▲]

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See detailVivre et faire vivre la transdisciplinarité. Retour d'expérience du cours "Approche intégrée d'une question d'environnement"
Denayer, Dorothée ULg; Melard, François ULg; Semal, Nathalie ULg

Conference (2016, May 13)

Cette communication présente la démarche pédagogique qui a mené un collectif d'enseignants, à la recherche d'une approche intégrée des questions d'environnement au développement d’une approche ... [more ▼]

Cette communication présente la démarche pédagogique qui a mené un collectif d'enseignants, à la recherche d'une approche intégrée des questions d'environnement au développement d’une approche d’apprentissage où l'entrée des publics concernés dans le dispositif d'apprentissage (Public-based-learning) permettent de faire vivre plutôt que d'enseigner aux étudiants la transdisciplinarité. Cette communication, centrée sur le collectif enseignant, developpe la dimension fondamentalement expérientielle et pratique de l’interdisciplinarité et son ancrage dans un certain type d’engagement du collectif.] [less ▲]

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See detailApproches intégrées en Sciences Pharmaceutiques
Servais, Anne-Catherine ULg; Ziemons, Eric ULg

Conference (2016, May 13)

Detailed reference viewed: 13 (1 ULg)
See detailTailoring γ-Al2O3 supports with specific silicon precursors
Claude, Vincent ULg; Vilaseca, Miriam; Heinrichs, Benoît ULg et al

Poster (2016, May 13)

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See detailEsthétique et repésentation dans les bandes dessinées d'Afrique noire francophone
Goufo Zemmo, ULg

Conference (2016, May 13)

Les campagnes de sensibilisation développées ces dernières années à travers internet, les festivals de bandes dessinées, sans oublier le succès de la bande dessinée Aya de Yopougon ont contribué ... [more ▼]

Les campagnes de sensibilisation développées ces dernières années à travers internet, les festivals de bandes dessinées, sans oublier le succès de la bande dessinée Aya de Yopougon ont contribué concrètement à lever un pan de voile sur les romans graphiques africains d’expression française. À ce sujet, de nombreuses interrogations se formulent quant à la réelle consommation de ces produits par les Africains, et les formes esthétiques qui en découlent. L’image n’est jamais neutre, elle est toujours le résultat du déploiement d’une subjectivité. Ainsi, nous nous proposons dans le cadre de cette communication de dépasser la question du fonctionnement esthétique de la bande dessinée d’Afrique noire francophone pour comprendre le système représentationnel et intersubjectif qui y est construit, ce qui nous permettra de montrer que les images réfléchissent non seulement sur le monde mais aussi sur elles-mêmes et par elles-mêmes. Il s’agira aussi de montrer qu’en tant que « lieu de savoir », la bande dessinée devient le siège concret de l’activité humaine et de la productivité sociale et culturelle. En tant que tel, les dispositions spatiales qui en sont faites, ne seraient pas du tout aléatoires, mais s’inscriraient dans un processus permettant une interprétation des sujets représentés de manière générale, et notamment les sujets féminins. [less ▲]

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See detailNanoparticles and microorganisms applied in groundwater decontamination
Lambert, Stéphanie ULg; Lavigne, Benoît

Conference (2016, May 13)

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See detailRestricted interests in autism with versus without speech onset delay : the importance of perceptually versus thematically organized interests
Chiodo, Liliane ULg; Majerus, Steve ULg; Eusèbe, Sandrine et al

Poster (2016, May 13)

Objectives : To explore whether autistic adults with vs without speech delay also differ in the perceptual vs thematic nature of their restricted interests.

Detailed reference viewed: 30 (9 ULg)
See detailCharacterization of FRD3, a zinc and iron homeostasis actor, in Arabidopsis
Scheepers, Maxime ULg; Charlier, Jean-Benoit; Spielmann, Julien ULg et al

Poster (2016, May 13)

Detailed reference viewed: 29 (5 ULg)
See detailLa cristallurie
GADISSEUR, Romy ULg

Conference (2016, May 12)

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Peer Reviewed
See detailCombined Centralized and Local Voltage correction in Active Distribution Network
Soleimani Bidgoli, Hamid ULg

in Combined Centralized and Local Voltage correction in Active Distribution Network (2016, May 12)

This paper presents a two-level real-time voltage control scheme to address the voltage violations in distribution grids hosting a significant number of Dispersed Generation Units (DGUs). The proposed ... [more ▼]

This paper presents a two-level real-time voltage control scheme to address the voltage violations in distribution grids hosting a significant number of Dispersed Generation Units (DGUs). The proposed scheme consists of a centralized and a local reactive power control. The local control provides fast response after a disturbance, reducing its impact and enhancing voltage quality. The centralized control relies on Model Predictive Control (MPC). It uses measurements collected throughout the network to bring the voltages inside desired limits. To do so, it adjusts in a coordinated way the reactive power set-points of the DGUs taking into account the local controls. The control method effectiveness has been evaluated on a 75-bus 11-kV test system hosting 22 DGUs. [less ▲]

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Peer Reviewed
See detailCentralized Model Predictive Control of Multi-Terminal Direct Current Grids
Papangelis, Lampros ULg

in Proc. of the 8th IEEE Benelux Young Researchers Symposium 2016 (2016, May 12)

This work describes a centralized control for Multi-Terminal Direct Current (MTDC) grids. It is based on Model Predictive Control (MPC) whose aim is to satisfy a desired schedule, while avoiding or ... [more ▼]

This work describes a centralized control for Multi-Terminal Direct Current (MTDC) grids. It is based on Model Predictive Control (MPC) whose aim is to satisfy a desired schedule, while avoiding or correcting any system limit violation. The central controller collects voltage and power measurements from the converters of the system in regular intervals and sends back converter power setpoints. The latter are calculated by solving a quadratic programming problem subject to linear constraints and using a simplified model for the DC system. In addition, the overall MTDC grid control structure including the local and the centralized controllers is described. [less ▲]

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See detailMolecular detection of single nucleotide polymorphisms on whole blood without DNA extraction
Detemmerman, L.; BOEMER, François ULg; SEGERS, Karin ULg et al

Poster (2016, May 12)

Detailed reference viewed: 20 (6 ULg)
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See detailSpatial Analysis of the Landslide Risk in the Cameroon Volcanic Line (CVL)
Mukenga, Williams ULg; Havenith, Hans-Balder ULg; Medjo Eko, Robert et al

Poster (2016, May 12)

Landslides are recognized as important geomorphologic process due to the role they play in the development of hill slopes in mountainous regions, and to related socio-economic consequences. There are many ... [more ▼]

Landslides are recognized as important geomorphologic process due to the role they play in the development of hill slopes in mountainous regions, and to related socio-economic consequences. There are many causes of landslides and their distribution varies with the changing conditioning factors. Slope stability depends on a number of causative factors and the knowledge of these variables can help to predict the type of landslide expected in the future. In this study, past landslide activity and triggering factors will be used to assess mass movement hazards along the Cameroon Volcanic Line (CVL). Spatial aspects will be studied in terms of landslide susceptibility maps that are important for development planning and disaster management. The current synthesis of landslide susceptibility map at regional scale is based on a literature review to inventory passed mass movement impacts, on the detection of landslide features from Google Earth imagery, combined with spatial analysis using Geographical Information Systems (GIS) and remote sensing. One of the most critical stages in landslide susceptibility mapping is the selection of landslide pre-conditioning, conditioning and triggering factors and weighting of the selected causative factors in accordance to their influence on slope stability. Google earth helps for delineating past (but recent) and present landslide activity whereas GIS is suitable when deriving static factors (slope aspect and surface curvature) and time-dependent factors (annual precipitation and changing groundwater table level) that are needed to produce landslide susceptibility maps. Landslide susceptibility mapping is based on the assumption that future landslides will occur under similar circumstances as past and present mass movements. Different methods, including the weight of evidence methods, are used for landslide susceptibility mapping along the Cameroon Volcanic line, as the area is known to be highly susceptible to landslide occurrences. [less ▲]

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See detailBildwissenschaft - Image et langage (introduction au colloque)
Hagelstein, Maud ULg

Conference (2016, May 12)

En guise d’introduction très rapide, je voudrais rappeler dans ses grandes lignes le projet auquel est liée l’organisation de ces journées de recherche. Le projet tente d’établir une archéologie de la ... [more ▼]

En guise d’introduction très rapide, je voudrais rappeler dans ses grandes lignes le projet auquel est liée l’organisation de ces journées de recherche. Le projet tente d’établir une archéologie de la théorie de l’image contemporaine, en particulier (en priorité) dans son versant germanophone, celui de la « science de l’image » (Bildwissenschaft) – discipline qui est, pour des raisons diverses (obstacle de la langue, nouveauté des problèmes, hermétisme des débats, etc.), encore peu connue chez nous. Or, me semble-t-il, l’explosion récente de la théorie de l’image (depuis les années 1990), théorie de l’image qui s’est décentrée par rapport à son milieu naturel et déployée sur de multiples territoires disciplinaires, appelle une nouvelle cartographie des études visuelles, qui reste à établir, ainsi qu’une redéfinition philosophique de l’image (ou des images) et de l’expérience qui en découle (les phénomènes visuels et iconiques étant à ce point diversifiés aujourd’hui que de nombreuses définitions sont en circulation sans que l’on perçoive toujours leur cohérence). Comme l’écrivait récemment Klaus Sachs-Hombach : « Une science générale de l’image n’a pas encore réussi à s’établir » (I, §1). L’idée de ce projet sur la Bildwissenschaft consiste donc à envisager du point de vue de la méthode les différentes approches récentes de l’image pour tenter d’identifier ce qu’elles ont en commun (c’est loin d’être évident). L’option qui me semblait pouvoir être investie dans un premier temps consiste à rapporter ces développements récents à la discipline d’interprétation des images née en Allemagne au début du XXe siècle, quelques décennies auparavant, (avec A. Warburg et surtout E. Panofsky), à savoir : l’iconologie. En effet, à mes yeux, du point de vue de son ancrage philosophique, la théorie de l’image actuelle puise ses principales ressources conceptuelles dans l’iconologie (et les problèmes théoriques qui lui sont associés). En quoi consiste ce modèle ? Pour le dire trop vite, la méthode iconologique vise principalement l’interprétation du contenu symbolique des images. Elle repose entièrement – ou en tout cas majoritairement – sur une compréhension symbolique des artefacts visuels : face à une œuvre picturale, par ex., on part bien entendu de ce qui est donné à la perception (les éléments sensibles et matériels présentés par l’œuvre), pour dégager petit à petit la signification profonde et intrinsèque de l’œuvre. Dans cette optique, l’image a donc pour vocation de délivrer un message, au même titre que le langage, mais avec des moyens différents. Or, si on tente de rapporter la Bildwissenschaft – telle qu’elle se déploie considérablement depuis quelques années – à l’iconologie, on doit admettre que ce modèle (le modèle iconologique) joue surtout négativement. Depuis la fin des années 1980, la méthode iconologique a commencé à générer chez les théoriciens de l’art et du visuel (en général), toutes sortes de réactions d’insatisfaction – voire même de franche hostilité. Et pour la plupart de ces auteurs, l’iconologie va servir de repoussoir autant que de modèle. Pour quelle raison ? Les critiques généralement adressées par les théoriciens contemporains à la méthode iconologique s’articulent le plus souvent autour du problème de la prédominance du paradigme langagier pour l’analyse des images. Or, à force de considérer trop strictement l’image sur le mode du signe qu’il faut lire et décrypter, on risque de l’assimiler purement et simplement à d’autres types de signes, notamment langagiers, et de diluer sa spécificité dans une théorie symbolique trop large. Globalement, il me semble que les différentes réactions s’accordent (ou en tout cas pourraient s’accorder) sur le fait que l’iconologie – telle qu’elle se présente dans sa version traditionnelle – doit être complétée : l’approche symbolique des œuvres doit par ex. pouvoir s’appuyer sur une attention soutenue à leurs modes de présentation (dans ce cas, les outils du « formalisme esthétique » peuvent alors être convoqués) ou à leur matérialité (les outils « phénoménologiques » peuvent idéalement venir au secours de l’analyse). En résumé, depuis la fin des années 1980, l’héritage iconologique est mis en question par des chercheurs qui – en réalité – veulent donner au concept d’iconologie un sens plus actuel et consacrent leurs efforts à l’étude de la logique des images (logique iconique), en tant qu’elle n’est pas contaminée par le modèle langagier. Autrement dit, les protagonistes de la Bildwissenschaft concernés par ces problématiques font le pari suivant : on peut étudier la logique du visuel en dehors de toute référence au langage et à sa syntaxe propre. Ils pensent pouvoir montrer en quoi une proposition visuelle diffère radicalement d’une proposition langagière. En rapportant la Bildwissenschaft à l’iconologie, on rencontre donc très vite la thématique centrale de l’iconic turn (tournant iconique), qui consiste à défendre l’idée d’une spécificité absolue de l’image à l’égard du langage. On l’a dit : Les défenseurs du tournant iconique pensent renverser la domination du paradigme langagier pour l’interprétation des images. Plutôt que de se concentrer exclusivement sur l’étude des contenus symboliques, il importe à leurs yeux de se concentrer sur ce qui fait la spécificité intrinsèque de l’image et de montrer comment sa matérialité affecte et contamine directement la production du sens. Contre la sémiotisation excessive des formes d’expression visuelle, il faudrait donc affirmer une fonction intransitive des images, c’est-à-dire redonner à l’image une épaisseur propre, qui ne renvoie qu’à elle-même. De nombreux auteurs s’inscrivent dans cette perspective (c’est le cas notamment de G. Boehm, qui veut sortir du paradigme langagier pour l’interprétation des images, ou de L. Wiesing, qui tente une définition asémantique de l’image). Les débats autour de l’iconic turn sont très particuliers et finalement difficiles à traiter. D’abord parce que l’iconic turn fait suite au linguistic turn (tournant déclaré dans la célèbre anthologie de Rorty - 1967), et appelle à sa suite d’autres tournants (on parle volontiers aujourd’hui d’un tournant anthropologique des études visuelles, comme on parle d’ailleurs aussi d’un tournant visuel de l’anthropologie, etc.). Or, ces changements radicaux de direction, ces changements de paradigme, finissent à mon avis par nous faire perdre nos repères (il y a trop de turn, pour le dire platement) et on a le sentiment de tourner en rond. Ensuite, autre difficulté : les débats liés à l’iconic turn sont souvent animés par la volonté de défendre – jusqu’à l’absurde – la valeur primordiale et la préséance absolue de l’image sur le langage. Si on s’enlise dans les positions parfois stéréotypées de ce débat, on pourra difficilement sortir du scepticisme langagier le plus stérile (l’idée que le langage manque inévitablement le caractère sensible de l’image). Pourtant, je ne voudrais pas non plus rendre trop caricatural ce débat qui m’intéresse tellement. D’un côté, j’ai l’impression qu’on y revient toujours, de l’autre, qu’on en est déjà sorti. On y revient toujours parce que ce problème continue à être essentiel pour toute une série d’auteurs qui cherchent obstinément à vouloir distinguer l’image des autres formes d’expression, à vouloir construire de nouvelles iconologies. Et l’effort qui consiste à essayer d’identifier les spécificités logiques du visuel doit sans cesse se renouveler ; les théories de la spécificité sont très fragiles parce que les contre-exemples et contre-arguments viennent très vite à l’esprit dès qu’il s’agit de séparer les pouvoirs de l’image et du langage. Dès que quelqu’un dit : « l’image fait ceci que le langage ne fait pas », on trouve quelqu’un d’autre pour répondre : « comment ? Mais si, le langage fait ça aussi ». Néanmoins, si on dégage peu de certitudes, de points fixes, ces débats sont loin d’être stériles (pour le dire vite : on a l’impression tout de même d’augmenter notre connaissance des images en traversant ces discussions). On y revient donc toujours mais en même temps on en est déjà sorti (et presque toujours déjà sorti) : aujourd’hui, on rencontre de multiples propositions, qui émanent soit du champ de la Bildwissenschaft lui-même, soit de l’extérieur (et parfois même très en amont de ces débats), et qui présentent des modèles plus complexes et nuancés qui n’opposent pas frontalement image et langage. Mais qui font l’effort de penser leur complémentarité. Et en réalité, ces efforts nous donnent à penser que la séparation des pouvoirs de l’image et du langage est peut-être très artificielle – ou en tout cas fragile – dans certains cas, mais qu’elle continue à être utile. [less ▲]

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See detailAssociation of Targeted metagenomic analysis and classical microbiology for Clostridium difficile detection and microbial ecosystem mapping of surfaces hands and foodstuffs in a meat processing plant
Rodriguez Diaz, Cristina ULg; Oukbir, Meriem; Taminiau, Bernard ULg et al

Poster (2016, May 11)

INTRODUCTION Zoonoses are infectious that can be transmitted between animals and humans through direct contact, close proximity or the environment. Since domestic and food animals frequently test positive ... [more ▼]

INTRODUCTION Zoonoses are infectious that can be transmitted between animals and humans through direct contact, close proximity or the environment. Since domestic and food animals frequently test positive for the bacterium, it seems plausible that C. difficile could be zoonotic. PURPOSE This study aimed to determine the prevalence and the epidemiology of C. difficile in cattle farms and the possible spread of the bacterium among animals and farmers. METHODS A total of 176 faecal samples of cattle were collected from 5 different Belgian farms. A stool sample of each farmer was also requested. Detection of C. difficile was performed by classical culture on C. difficile selective medium (cycloserine cefoxitin fructose cholate). Isolates were characterised by PCR-ribotyping and Genotype Cdiff test (Hain Lifescience), which allows the detection of all toxin genes, mutations in gyrA gene and the deletion in the regulator gene tcdC. RESULTS C. difficile was detected in 14/178 (7.9%) animal samples. Isolates were grouped into five different types, including PCR-ribotype 015. All of them were identified as toxigenic. In contrast, none of the 5 farmers studied were positive for the bacterium. SIGNIFICANCE Results obtained indicate that PCR-ribotypes commonly isolated from hospitalised patients are also present in cattle, indicating an animal reservoir. However, a zoonotic transmission could be not demonstrated in the farms studied. [less ▲]

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See detailAccurate measurement of radius evolution as a function of direction in 3D images
Plougonven, Erwan ULg; Hubert, Julien ULg; Collin, Frédéric ULg et al

Poster (2016, May 11)

Very often the reason for using of X-Ray tomography in a research project is to measure the evolution of some geometrical characteristic. The sought characteristic may be explained in simple words like ... [more ▼]

Very often the reason for using of X-Ray tomography in a research project is to measure the evolution of some geometrical characteristic. The sought characteristic may be explained in simple words like size, shape, or distance, but in practice measures based on these notions can have a complex implementation. We present a simple problem, measuring the evolution of radius in a cylindrical sample (a common shape for sample preparation for tomography) and how this value differs according the direction in which we look, when such evolution is known to be anisotropic. The solution is not unique, but we show that a naïve manual approach are not accurate enough, and how even a simple geometric notion such as radius needs a thorough definition in relation to its applicability to 3D image analysis. We extend the argument to how a good understanding of the notions and algorithms used in the quantification of geometrical characteristics can directly affect the pertinence and representativity of the results. [less ▲]

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See detailOzone concentration and CO2 flux monitoring in a belgian forest
Hurdebise, Quentin ULg; Bergmans, Benjamin; Aubinet, Marc ULg

Poster (2016, May 11)

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

Temperate forests, as other ecosystems and oceans, mitigate the accumulation in the atmosphere of CO2, the main responsible for the current climate change. It is, therefore, a necessity to understand how these forests react and will react in a changing environment. That requires long-term monitoring of the environment. Tropospheric ozone is one parameter to monitor as it affects the forest by inducing oxidative stress once inside the leaves. Using 16 years of continuous data from an air quality monitoring station managed by the ISSeP (Institut Scientifique de Service Public) located in a mixed forest in east Belgium, we identified ozone concentration extreme events and we investigated their occurrence frequency as well as their relation with climatic variables and air components. As variables are subjected to daily, yearly and inter-annual dynamics, anomalies were used to detect extreme events. To obtain anomalies, we removed the previously mentioned dynamics from half-hourly raw data. Daily and yearly dynamics were removed first and explained 40% of the variability observed in half-hourly ozone concentrations. Then, the inter-annual dynamic was obtained by computing the yearly mean of the residuals, it accounted for 2% of the variability observed. A significant (p<0.01) decreasing trend was observed for these residuals. Determining if that trend is site specific or regionally observed can be done by applying the same analysis to the other sites from the network managed by the ISSeP. No significant trend in the yearly frequency and intensity of extreme events was observed. We used a stepwise regression to identify the variables that explain these extreme events. Significant relations were found between ozone concentration and climatic variables (vapor pressure deficit, temperature, radiation and wind direction) as well as other air components concentration (NO2, NO, NOX, CO). The next step will be to estimate the forest capacity to uptake ozone in order to predict ozone-induced damage and compared it to the CO2 uptake and H2O emissions measured in an ICOS site, the Vielsalm Terrestrial Observatory, located in the same forest at less than 300 meters from the air quality monitoring station. [less ▲]

Detailed reference viewed: 43 (1 ULg)
See detailRecollection and Familiarity in Normal Aging
Simon, Jessica ULg; Gilsoul, Jessica ULg; Bastin, Christine ULg

Conference (2016, May 11)

Detailed reference viewed: 19 (2 ULg)
Peer Reviewed
See detailModelling nitrogen incorporation by primary producers of a Mediterranean coastal area
Elkalay, Khalid; Frangoulis, Constantin; Richir, Jonathan ULg et al

Conference (2016, May 11)

The aim of this study was to simulate the uptake flow of nitrogen (gN m-2) of P. oceanica meadow for 4 primary producers of the bay of Calvi (Corsica, France) (phytoplankton, macro-algae, the Posidonia ... [more ▼]

The aim of this study was to simulate the uptake flow of nitrogen (gN m-2) of P. oceanica meadow for 4 primary producers of the bay of Calvi (Corsica, France) (phytoplankton, macro-algae, the Posidonia oceanica leaves and their epiphytes). The model developed for this purpose simulates the evolution of nitrogen incorporation. The effect of the light intensity, and the water column temperature and concentration in internal and external nitrogen on nitrogen incorporation by the 4 primary producers is modeled. Thus, the incorporation rate of both NO3-and NH4+by phytoplankton was more important than for benthic producers. Macro-algae incorporations had intermediate incorporation rates between the ones of, the phytoplankton and P. oceanic leaves and their epiphytes. The incorporation of NH4+ by the phytoplankton is higher than the incorporation of NO3-. The model appears well adapted to establish the main environmental factors that determine the incorporation of inorganic nitrogen by the various primary producers. It is also able to represent the relative importance of nitrogen incorporation by the various producers. [less ▲]

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See detailImplementing principles of Quality by Design (QbD) in validation context
Hubert, Cédric ULg; Lebrun, Pierre ULg; Rozet, Eric et al

Conference (2016, May 10)

Analytical method performances have to be specified by the analyst trough the definition of the “Analytical Target Profile (ATP)”, as proposed by the regulatory bodies. In the specific context of the ... [more ▼]

Analytical method performances have to be specified by the analyst trough the definition of the “Analytical Target Profile (ATP)”, as proposed by the regulatory bodies. In the specific context of the pharmaceutical industry, regulatory authorities have recently imposed the assessment and management of risk throughout the entire product lifecycle. This includes the analytical procedure and consequently its own lifecycle. The development step of an analytical method is still largely addressed using a “Changing One Separate Factor a Time (COST)” approach (also known as the “Quality-by-Testing (QbT)” approach). This strategy can lead to a suitable method for assessing the risk of routine use, even where the experimental domain is not examined. However, in order to consider an experimental domain rather than a set of specific experimental conditions during the development phase, a multivariate approach must be considered: the “Quality-by-Design (QbD)” strategy. This strategy allows the definition of a “Design Space (DS)” by means of design of experiments (DoE). This DS, computed considering critical method parameters, allows the analyst to focus on the main objective of an analytical method: obtaining reliable results using a robust method. In the course of a specific case study, the benefits of the QbD strategy in terms of managing the qualitative part of the analytical process were highlighted. Working in the context of analytical procedure, the validation step is a major part of the analytical method lifecycle. Indeed, the objective of analytical method validation is to demonstrate that this method is suited for quantifying the target analytes with an established and suitable level of accuracy, as defined by the “ATP”. This is sometimes called the “fit-for-future-purpose” concept. The decision regarding the validity of a method based on prediction can be achieved by using the “β-expectation tolerance interval” (accuracy profile). The capability of this approach to manage the quantitative part of the analytical procedure is nowadays largely illustrated in scientific literatures. Considering the assessment and management of risk throughout the analytical lifecycle, a global strategy allowing the unification of the development and validation phases in a single step was considered. With this innovative approach, a strategy allowing the management of global analytical risk (i.e., for both qualitative and quantitative part of the analytical method) was proposed. Indeed, the developed strategy allows validating an entire experimental domain by means of the accuracy profile rather than a single set of specific experimental conditions. With this strategy, the DS is no longer simply the place where qualitative performances are obtained, but also the space where quantitative performances of the analytical procedure are assessed and managed. [less ▲]

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See detailLes normes étatiques relatives à la modération des rémunérations et le droit de négociation collective
Kéfer, Fabienne ULg

Conference (2016, May 10)

Les récentes lois des 23 et 28 mars 2015 fixant la marge d'évolution du coût salarial et organisant un saut d'index empêchent les partenaires sociaux de fixer librement l'évolution des salaires. Ces lois ... [more ▼]

Les récentes lois des 23 et 28 mars 2015 fixant la marge d'évolution du coût salarial et organisant un saut d'index empêchent les partenaires sociaux de fixer librement l'évolution des salaires. Ces lois sont-elles ou non conformes aux dispositions supralégislatives? [less ▲]

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See detailDe l’usage des « carnets de recherche » accompagnant la parution des revues sur OpenEdition
Mayeur, Ingrid ULg

Conference (2016, May 10)

Les portails de diffusion des revues numériques en sciences humaines permettent la communication d’annonces, billets et actualités lié aux périodiques édités. Ces genres textuels sont soit pris en charge ... [more ▼]

Les portails de diffusion des revues numériques en sciences humaines permettent la communication d’annonces, billets et actualités lié aux périodiques édités. Ces genres textuels sont soit pris en charge par le site même de la revue, soit diffusés sur un blog d’accompagnement – qui peut également jouer un rôle de veille scientifique, de réflexion et d’échange. Dans le cadre de ma recherche doctorale sur les modes de circulation du savoir au sein des plateformes numériques de la recherche en sciences humaines, je voudrais étudier au moyen des outils classiques d’analyse du discours, de l’étude des écrits d’écran et des processus d’éditorialisation les spécificités des textes véhiculés sur ces blogs, et leur complémentarité avec le site de la revue. Comment le portail de diffusion contraint-il la publication de textes liés à la revue? Quels sont les genres textuels mis en œuvre dans l’accompagnement d’un périodique ? De quelle manière l’actualité (annonce de parution, appel à contribution) se voit-elle corrélée au contenu même du périodique ? Mon étude portera essentiellement sur la plateforme OpenEdition, et les carnets de recherche Hypotheses accompagnant une revue en ligne diffusée sur Revues.org. J’observerai aussi, de manière contrastive, la gestion de ces flux d’actualité par un autre portail, Erudit.org. [less ▲]

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See detailRéférentiels psychopédagogiques en Belgique francophone: un outil de professionnalisation ?
Pirard, Florence ULg

Conference (2016, May 10)

L'élaboration d'un curriculum pour les services d'accueil des jeunes enfants constitue l'un des leviers pour une qualité de services (OECD 2001, 2006, 2012). Elle pose ensuite la question de l ... [more ▼]

L'élaboration d'un curriculum pour les services d'accueil des jeunes enfants constitue l'un des leviers pour une qualité de services (OECD 2001, 2006, 2012). Elle pose ensuite la question de l'accompagnement de sa diffusion dans une visée de professionnalisation, et non de standardisation. [less ▲]

Detailed reference viewed: 23 (4 ULg)
Peer Reviewed
See detailThe influence of COMT single nucleotide polymorphism (rs4680) on the neural substrates of working memory representations maintenance in healthy aging
Manard, Marine ULg; François, Sarah ULg; Bahri, Mohamed Ali ULg et al

Poster (2016, May 10)

The COMT val108/158met polymorphism was associated to the dopaminergic modulation in the brain, and therefore stimulated research on its influence for cognitive functioning and particularly working memory ... [more ▼]

The COMT val108/158met polymorphism was associated to the dopaminergic modulation in the brain, and therefore stimulated research on its influence for cognitive functioning and particularly working memory. First, a general advantage of carrying the met allele was reported. However, many studies used tasks that did not allow efficiently assessing the contribution of manipulation and maintenance processes in working memory, leading to divergent results, in both young and older populations, resulting in debates about the exact phenotypic effect of the COMT polymorphism. Using fMRI, this study was designed to assess the potential effect of the COMT polymorphism on age-related differences in working memory representations maintenance abilities (Sternberg paradigm). Partial Least Squares method was used to determine the brain-behavior correlations at low, intermediate, and high cognitive demands among young and older groups, homozygous for the val or for the met allele. First, young val/val showed some disadvantages at brain and behavioral level compared to their m/m counterparts. However, in older adults subgroups, the m/m participants tended to show greater age-related difference (when compared to younger adults with similar genotype), suggesting an advantage in carrying the val allele when dopamine signaling is not at optimal efficiency (optimal: young/middle adulthood vs suboptimal: childhood or older ages). These results will be discussed in regard to compensating theories and dopaminergic models accounting for the potential effect of COMT polymorphism on stability/flexibility abilities. [less ▲]

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See detailLes outils géomatiques dans le projet ExTraCar
Cornet, Yves ULg

Conference (2016, May 09)

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Peer Reviewed
See detailEstetrol, a natural SERM exhibiting combined estrogenic and antiestrogenic properties on mammary gland and breast cancer
Gérard, Céline ULg; Gallez, Anne ULg; BLACHER, Silvia ULg et al

Conference (2016, May 09)

The increased risk of breast cancer and thromboembolism in women who take Hormone Replacement Therapy (HRT) currently is a major public health problem. The discovery of novel molecules with better safety ... [more ▼]

The increased risk of breast cancer and thromboembolism in women who take Hormone Replacement Therapy (HRT) currently is a major public health problem. The discovery of novel molecules with better safety profile would provide useful advances for patient care. Estretrol (E4) appears as a promising candidate for HRT. Indeed, in contrast to current treatment containing ethinyl estradiol or estradiol (E2), E4 has a minimal impact on liver cells activity supporting a decreased incidence on thromboembolic events. In preclinical studies, E4 has been effective against the main symptoms of menopause such as hot flushes, vaginal atrophy, and osteoporosis, from a starting dose of 0.3 mg/kg/day. The aim of this study was to define the impact of E4 on mammary gland and breast cancer development when it is used at concentrations effective for menopause symptom relief. We report preclinical data showing that E4 is less efficient than E2 to induce mammary gland growth. Treatment of estrogen receptor (ER)-positive breast cancer with several concentrations of E4 has shown that 0.3 mg/kg/day E4 did not increase tumor development. However, at 3mg/kg/day, E4 increased the growth of hormone-dependent tumors and their metastatic dissemination in ovariectomized and intact mice. This effect was similar to the one observed with E2 used at 0.08 mg/kg/day. E4 presents also some anti-estrogenic effects on mammary gland and antitumor activity on breast cancer by decreasing the strong proliferative effect of E2. While ERα is the predominant receptor mediating its effects, the dual weak-estrogenic/anti-estrogenic feature of E4 results from differential signaling pathways activation. Both nuclear and rapid extranuclear signaling pathways are necessary for a complete estrogenic effect of E4. However, the antitumor action of E4 is not due to a capacity to antagonize E2-induced nuclear activity. In conclusion, our results support that E4, if it is used in strictly controlled clinical applications, could have no or only limited impact on breast and breast cancer. [less ▲]

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See detailINTERNATIONAL AND EUROPEAN SANCTIONS FOR THE TRADE OF DUAL-USE GOODS AND TECHNOLOGIES: A COMPARATIVE OVERVIEW.
Colussi, Ilaria Anna ULg

Conference (2016, May 09)

One of the basic rules in trade law is the freedom of trade. However, such rule encounters some limits when the object of trade is constituted by strategic and sensitive items, among which there are the ... [more ▼]

One of the basic rules in trade law is the freedom of trade. However, such rule encounters some limits when the object of trade is constituted by strategic and sensitive items, among which there are the so-called 'dual-use' goods and technologies. Despite the difficulty to define them, there is a common understanding that they are materials and items normally used for civilian/peaceful purposes but which may also have military application. Because of their 'sensitiveness' and their risk to affect security, health, the environment etc., their trade needs to be controlled. One form of controlling their trade is represented by the imposition of sanctions to be adopted in case of violation of trade rules. In our understanding, there are three categories of sanctions: (a) ‘supranational’ ones, enacted at the international and European Union (EU) level, which are addressing the whole States (‘comprehensive’ sanctions, such as embargoes, boycotts and financial measures), or specific individuals or groups involved in legal activities (‘targeted’ or ‘smart’ sanctions, such as asset freezes and travel bans); (b) ‘implementing’ ones, which are enacted at national level. They consist of administrative, civil or criminal rules implementing legally binding/‘hard law’ supranational rules (i.e., national sanctions for violation of international or regional embargoes or other trade sanctions), and those implementing politically binding or ‘soft law’ rules (i.e., national sanctions for the violation of export control regimes, which are the guidelines for dual-use trade, provided by international forum of countries within the Zangger Committee, the Nuclear Suppliers Group, Australia Group, the Wassenaar Arragement and the Missile Technology Control Regime, and at the EU level through the Regulation 428/2009); and (c) ‘unilateral sanctions’ and ‘countermeasures’, which are National autonomous measures against another State or the single citizens of that State. In this paper, the focus is posed on the first category only. It aims to analyse - with a comparative approach - on the one hand, the types of measures adopted at the level of the United Nations (UN) on the basis of Chapter VII of the UN Charter and through the Security Council resolutions and, on the other one, the restrictive measures introduced within the Common Foreign and Security Policy of the EU. [less ▲]

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See detailLife cycle assessment of sound insulation solution made from waste paper
Groslambert, Sylvie ULg; Ernst, Valentin; Léonard, Angélique ULg

Poster (2016, May 09)

Buildings notably contribute to global environmental negative impacts due to con-sumption of both embodied energy and natural resources as well as various emissions during their whole life cycle. It is ... [more ▼]

Buildings notably contribute to global environmental negative impacts due to con-sumption of both embodied energy and natural resources as well as various emissions during their whole life cycle. It is therefore necessary to develop practices to reduce these impacts, mainly by reducing the part of non-renewable resource in material as well as by ensuring the lowest energy consumption possible during their lifetime. For instance, the use of recycled raw materials can lead to significant improvement in building environmental impact. In this context, the Life Cycle in Practice (LCiP) project helps SMEs to reduce the environmental impacts of their products and services across the entire life cycle. Within the frame of this project, Pan-Terre (BE) Acoustix panel impact is evaluated in a cradle-to-gate life cycle assessment (LCA). Evaluation of environmental performance is needed to support both the design and the production of waste based insulation solutions. Manufactured for the last twenty past years, the Acoustix Pan-Terre panel is designed for airborne sound insulation in walls and or floors. This product can only be obtained by mixing in a sensible way two raw materials from cellulose origin, recycled paper and broken shives of flax. Functional unit is 1 m² of panel ready for shipping. Acoustix panels are made by pressing a mix of cellulose from waste paper, flax shives and water. Scraps materials are entirely recycled in the process. Flax cultivation has a favourable impact on the climate change indicator due to carbon dioxide uptake for the photosynthesis occurring during the plant growth. But the drying of the panels is largely contributing to fossil fuel depletion and climate change due to natural gas burners. Life Cycle Assessment of Acoustix sound insulating panels ready to ship highlights some improvements that can be made by optimisation of the drying technology and the (partial) replacement of natural gas burners by alternative fuel burners (such as waste paper and scrap materials). Data are processed in SimaPro 8.1 software, with Ecoinvent 3 and ELCD 3 databases, and analyzed with the CML IA method. This method is compliant with the indicators required by EN15804 standard in order to communicate on the environmental performance of Acoustix panels. [less ▲]

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See detailHow to specify the environmental footprint of electricity? A methodological approach
Belboom, Sandra ULg; Léonard, Angélique ULg

Conference (2016, May 09)

When assessing the environmental footprint of a product or an industrial process, ma-jor impacts in climate change and resources depletion are usually linked to direct or indi-rect energy consumptions ... [more ▼]

When assessing the environmental footprint of a product or an industrial process, ma-jor impacts in climate change and resources depletion are usually linked to direct or indi-rect energy consumptions. Focusing on electricity generation, largely dispersed results can appear for the concerned impact categories depending on the energy mix taken into account. An accurate knowledge of the mix is of major importance for the prediction of the environmental footprint of electricity. As this mix changes from one country to another and through time, regular update is needed to obtain an accurate value of impact for the studied product. Another criteria to also take into account is the specific technology used to generate electricity depending on the primary energy (gas, coal, uranium, sun, wind, etc.). This study aims to generate a simplified tool, containing sufficient data to assess, within a range of 10 % uncertainty, the value of the environmental footprint of electricity, based on a limited amount of accessible parameters. The global life cycle of electricity generation is taken into account, from the resources extraction to the end-of-life. This is essential to be able to compare, on a same basis, the renewable and classical resources for electricity generation. The functional unit of this study for numerical applications is 1 MWhe. To achieve our goal, the following methodological approach has been pursued. First, the energy mix for electricity generation has been collected trough years for different countries. Then a deeper study of specific technologies relative to each kind of primary energy consumption has been performed. Meta-analyses relative to LCA results have been studied to highlight the main important criteria of these technologies. Then, the amount of needed data for the environmental assessment of these technologies has been reduced to the main important ones. The step further is about the use of these data to obtain an available tool to predict the environmental footprint of electricity depending mainly on the energy mix and used technologies. The environmental impact of 1 MWhe can then be easily calculated using this tool in several categories as climate change, acidification, ozone layer depletion, etc. using the ILCD method. Concerning the resources depletion assessment, all available methodolo-gies have been studied with a specific focus on the CEENE method using an exergetic assessment of resources. This method allows the highlighting of the use of energy and all types of resources (fossil, renewable like wind, sun or land). This perspective can also be used to discriminate several resources for the electricity production. A comparison of the results obtained using resources impact methods has then been performed and some challenges concerning the use of existing impact pathways have been highlighted as well as some perspectives to tackle them. This research has been supported by the Public Service of Wallonia – Department of Energy and Sustainable Building within the framework of the ECEB project [less ▲]

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See detailDepositional Sequences of the Late Pleistocene Shoreline System, Bor Basin, Southern-Central Anatolia: Implications for Reconstructing Lake Level Changes
Bayer Altın, Türkan; El Ouahabi, Meriam ULg; Fagel, Nathalie ULg

Conference (2016, May 08)

The Bor Basin is located in the east part of the Konya-Ereğli Plain occupied by Pleistocene lake (Fig. 1). Paleo-shoreline deposits rising western margins of the basin marked the former extent of a now ... [more ▼]

The Bor Basin is located in the east part of the Konya-Ereğli Plain occupied by Pleistocene lake (Fig. 1). Paleo-shoreline deposits rising western margins of the basin marked the former extent of a now desiccated Late Pleistocene Lake. This study evaluates the former lake level changes and the sequential evolution of a shoreline system that developed at the western margin with lacustrine fills of the Bor paleolake near Zengen settlement. The fills belongs to alluvial fans formed by streams coming from the high volcanic mountains located within the northern part of the basin. The sediment sequence of the fan reflects receded and extended levels of the former lake. 23 samples were obtained at the sand-quarry representing of various facies of the lacustrine fills. These samples were analyzed for mineralogical characterization, using XRD and their CaCO3 values were quantified. According to analysis, three evident different phases of weathering were distinguished in this deposit (Fig. 2). Weathering conditions occurred at the bottom of the profile (level 7) with the appearance of the vermiculite and illite/smectite mixed layer clays. Aridification phases occurred at the level of sample 16 with the appearance of the palygorskite. At the shallow levels from the samples 21 to 22, another aridification phase occurred attested by the appearance of the palygorskite, the mixed layers clays (illite/smectite) and the neoformation of the chlorite by weathering. The palygorskite occurrence showed only in the clay fraction (<2µm) associated with dolomite levels which support its secondary formation during dry periods and pedogenetic transformation. Pedogenesis conditions were attested also by the presence of the mixed layers clays at those levels. [less ▲]

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See detailOn the Laser Cladding of Ti Alloy Ti-6Al-4V with Low Laser Power
Mertens, Anne ULg; Paydas, Hakan ULg; Tchuindjang, Jérôme Tchoufack ULg et al

in Ventakesh, V.; Pilchak, A.L.; Allison, J.E. (Eds.) et al Proc. of the 13th World Conference on Titanium (2016, May 06)

Laser cladding is an economic layer-by-layer near-net-shape process for the production and the repair of metallic parts. In this process, a metallic powder is projected onto a substrate while being molten ... [more ▼]

Laser cladding is an economic layer-by-layer near-net-shape process for the production and the repair of metallic parts. In this process, a metallic powder is projected onto a substrate while being molten by a laser beam. Laser sources with fairly high power – i.e. typically 2kW − are often used to ensure short building times and high productivity. However, this approach has limitations. Indeed, it is very difficult to produce thin walls at high laser power. Moreover, an increase of the incident energy may give rise to a relatively coarser microstructure, and this will in turn affect the mechanical properties of the component. In order to address these issues, this paper aims at assessing the potential of a laser source with a lower maximum power of 300W to enhance the flexibility of the process. Two types of samples – i.e. thin walls or bulk deposits − were produced at low laser power from alloy Ti-6Al-4V. Their geometry, microstructures and local hardness are characterised and correlated with the thermal history experienced during fabrication. [less ▲]

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