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See detailUse of on-line flow cytometry for the characterization of microbial stress dynamics during the bioprocess
Brognaux, Alison ULg; Han, Shanshan; Sorensen, Soren et al

Conference (2014, April 03)

Microbial cell population heterogeneity is now recognized as a major source of issues for the development and optimization of bioprocesses. Flow cytometry is a very powerful tool for the follow up of ... [more ▼]

Microbial cell population heterogeneity is now recognized as a major source of issues for the development and optimization of bioprocesses. Flow cytometry is a very powerful tool for the follow up of physiological properties of microbial cells in process-related conditions at the single cell level, and can be used to study the dynamics of segregation directly in bioreactors. In this context, specific interfaces have been developed in order to connect flow cytometer (FC) directly on bioreactor for automated analyses. In this work, we propose a simplified version of such interface and demonstrated its usefulness for multiplexed experiments. This automated FC system has been tested for the follow up of the dynamics of an E. coli pfis::gfpAAV fluorescent bio-reporter and its PI uptake, correlated with membrane permeability. This bioreporter is composed of a fis promoter, a growth dependent promoter-indicator of the nutrient status of cells, fused to a gene expressing an unstable variant of GFP. The results obtained showed that the dynamics of the GFP synthesis is complex and can be attributed to a complex set of biological parameters. Segregation in the membrane permeability has been noticed. This work demonstrates that a simplified version of on-line FC can be used at the process level for the investigation of the dynamics of complex physiological mechanisms. [less ▲]

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See detailCaractérisation minéralogique, géochimique et géotechnique des matières premières utilisées en poterie dans le site d’Agafay, Marrakech, Maroc.
El Boudour El Idrissi, Hicham; Daoudi, Lahcen; El Ouahabi, Meriam ULg et al

Conference (2014, April 03)

Le site potier d’Agafay est localisé à 20 km au S-W de la ville de Marrakech, à l’ouest de l’oued N’Fis. L’activité potière y a débuté par transfert du savoir-faire à partir du village de Tamsloht vers ... [more ▼]

Le site potier d’Agafay est localisé à 20 km au S-W de la ville de Marrakech, à l’ouest de l’oued N’Fis. L’activité potière y a débuté par transfert du savoir-faire à partir du village de Tamsloht vers 1940 apr. J.-C. Le site comporte environ 90 ateliers où sont actifs 240 artisans. Les principales pièces produites sont les gasriyas (i.e., plats traditionnels de couscous et de modelage de pâtes de pains) et les briques des grandes murailles traditionnelles. Les matières premières utilisées, brutes ou en mélange, sont issues des terres agricoles locales (Ag1 et Ag5) pour les gasriyas et des dépôts actuels du oued N’Fis (Ag7) pour les briques. Les problématiques rencontrées dans ce site concernent les deux types de produits, gasriyas et briques. Dans le premier cas, des grains de la chaux gonflent dans les pièces après le contact prolongé des pièces produites avec l’air. Ce gonflement engendre des décollements dans les tessons et nuit à la qualité du produit final. Dans le deuxième cas, la distribution non homogène de la chaleur à l’intérieur des fours traditionnels utilisés engendre une très grande variation de couleur dans les briques, elles sont généralement tordues et certaines fondent totalement. Notre projet vise à une caractérisation scientifique des différentes phases de fabrication afin de remédier à ces problèmes. Les résultats montrent que la composition chimique est surtout silico-alumineuse (55 à 61 % de SiO2 ; 16 à 20% d’Al2O3), la teneur en Fe2O3 se situe entre 6 et 8 %, celle de CaO ne dépasse pas 6% pour les pâtes des gasriyas et atteint 10 % pour les pâtes des briques. La teneur en carbonates mesurée par le calcimètre de Bernard varie entre 5 et 14 %. La teneur en matière organique varie entre 5 et 7,5 %. L’indice de plasticité oscille entre 16 et 17,5. Pour des teneurs en eau proches de la limite de plasticité le degré de retrait au séchage des gasriyas est de l’ordre de 5 %, il est plus élevé pour les briques (8%) ce qui nécessite une plus grande maitrise du processus de séchage pour éviter que les pièces ne se tordent pas. La granulométrie des pâtes utilisées pour les gasriyas a montré une teneur moyenne de 50 % pour les argiles, 32 % pour les limons et 18 % pour les sables. Les briques comportent une proportion égale des trois classes granulométriques. La minéralogie de l’ensemble des pâtes est formée de quartz (< 27%), plagioclase (13%), calcite (7 à 9%), dolomite (5%) et argile (50%, 34% et 34% pour Ag1, Ag5 et Ag7, respectivement). Le feldspath potassique est présent uniquement dans l’échantillon Ag7. Concernant la fraction argileuse, elle est surtout constituée d’illite pour l’ensemble des pâtes, associée à des interstratifiés irréguliers 14c-14s (13 %) pour la pâte des briques, et une teneur de 11 % de smectite pour la pâte des gasriyas (Ag5). La mesure de la vitesse sonique a montré que les pièces formées par pression aboutissent à une porosité moindre que celle des pièces produites par boudinage. La densité des pièces produites reste semblable pour les cuissons à 950°C et 1050°C. Le plus bas degré de porosité ainsi que les plus grandes valeurs de résistance mécanique à la compression ont été enregistrés sur les pièces cuites à 1050 °C. Les contraintes maximales atteintes se situent entre 51 et 59 MPa pour les gasriyas et 24,5 MPa pour les briques. Quant à la résistance mécanique à la flexion, elle varie entre 17,4 et 20,3 N/mm² pour les gasriyas et 9,4 N/mm² pour les briques. L’analyse DRX des pièces cuites à 1050 °C a montré la disparition totale des carbonates et des argiles à cette température, accompagnée de l’apparition de la géhelénite, cristobalite, anorthoclase, diopside, spinelle et hématite. A l’issue de cette étude, nous recommandons un tamisage humide à 1 mm pour réduire l’effet des gros grains de la chaux, une cuisson par palier jusqu’à 1050°C est également nécessaire pour comprendre les transformations des phases minéralogiques et vitreuses. Finalement, l’utilisation des fours équipés d’une sonde pour garantir une meilleure distribution de la chaleur. [less ▲]

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See detailDiversité et abondance entomologique en cultures maraîchères à Libreville et à Owendo (Gabon)
Bayendi-Loudit, Sandrine ULg; Poligui, René Noël ULg; Ndoutoume Ndong, Auguste et al

Conference (2014, April 02)

In order to improve knowledge of the diversity and abundances of the entomofauna occurring within market gardenings in Gabon, this study was conducted in three localities in Libreville and Owendo, from ... [more ▼]

In order to improve knowledge of the diversity and abundances of the entomofauna occurring within market gardenings in Gabon, this study was conducted in three localities in Libreville and Owendo, from July1st to August 31st, 2012. Insect collections from yellow traps and visual observations were performed weekly within plots in which grow Amaranth (Amaranthus sp., Amaranthaceae), red sorrel (Hibiscus sabdariffa L, Malavaceae), Tomato (Lycopersicon esculentum Mill, Solanaceae) and Cabbage (Brassica oleracea L, Brassicaceae). A total of 7119 insects were assessed and taxonomically classified in 8 distinct orders comprising 81 families. The study highlighted some entomologic families with agronomic interest. The main pests were represented by Aphididae (31,0%), Cecidomyiidae (5,1%), Chrysomelidae (4,0%) and Thripidae (2,0%), the useful insects (pollinators and predators) by Dolichopodidae (5,4%), Andrenidae (2,6%) Coccinellidae (1,7%), Syrphidae (0,6%), Braconidae (0,5%) and Hemerobiidae (0,1%) and the associated insects were Psychodidae (7,4%), Muscidae (5,9%), Formicidae (4,4%) and Anthomyiidae (4,2%). Entomological diversity is discussed according to the local conditions and potential for sustainable pest control encountered. [less ▲]

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See detailBayesian inference of a dynamic vegetation model for grassland
Minet, Julien ULg; Laloy, Eric; Tychon, Bernard ULg et al

Conference (2014, April 02)

As a part of the MACSUR task L2.4, we probabilistically calibrated the CARAIB dynamic vegetation model by Markov chain Monte Carlo (MCMC) simulation with the DREAMZS sampler.. CARAIB is a mechanistic ... [more ▼]

As a part of the MACSUR task L2.4, we probabilistically calibrated the CARAIB dynamic vegetation model by Markov chain Monte Carlo (MCMC) simulation with the DREAMZS sampler.. CARAIB is a mechanistic model that calculates the carbon assimilation of the vegetation as a function of the soil and climatic conditions, and can thus be used for simulating grassland production under cutting or grazing management. Bayesian model inversion was performed at 4 grassland sites across Europe: Oensingen, CH; Grillenburg, DE; Laqueuille, FR and Monte-Bodone, IT. Four daily measured variables from these sites: the Gross Primary Productivity (GPP), Net Ecosystem Exchange (NEE), Evapotranspiration (ET) and Soil Water Content (SWC) were used to sample 10 parameters related to rooting depth, stomatal conductance, specific leaf area, carbon-nitrogen ratio and water stresses. The maximized likelihood function therefore involved four objectives, whereas the applied Bayesian framework allowed for assessing the so called parameter posterior probability density function (pdf), which quantifies model parameter uncertainty caused by measurement and model errors. Sampling trials were performed using merged data from all sites (all-sites-sampling) and for each site (site-specific sampling) separately. The derived posterior parameter pdfs from the all-sites sampling and site-specific sampling runs showed differences in relation with the specificities of each site. Analysis of these distributions also revealed model sensitivity to parameters conditioned on the measured data, as well as parameter correlations. [less ▲]

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See detailInvolved PhD research – a case study between agronomy and social sciences
Klaedtke, Stephanie ULg; Chable, Véronique; Stassart, Pierre M ULg

Conference (2014, April 02)

In research projects based on questions which emerge from practice and from interactions with different stakeholders, researchers engage with research partners in a cooperative and interdisciplinary ... [more ▼]

In research projects based on questions which emerge from practice and from interactions with different stakeholders, researchers engage with research partners in a cooperative and interdisciplinary approach. In PhD projects, including a diverse network of partners and interdisciplinarity may be challenged by the short duration of the projects and by the positivist and reductionist approaches in which students are initially trained. Based on a concrete PhD research project on small-scale organic seed production, the objective of this work is to elucidate how interdisciplinarity and an action-base can nevertheless gradually be integrated by PhD students into an approach best termed as involved research. Reflection on the roles of partners, their involvement, motivation and points of view and on the evolution of questions posed during interactions between students and stakeholders contributes to recognizing the role of each partner, situating research postures, and identifying the types of knowledge and transformations produced. While PhD students and their research projects can evolve towards more holistic and constructivist approaches, it is crucial to maintain opportunities for reflection during their research in order to realize the potentials of involving all those involved in the projects and produce effective social learning processes. [less ▲]

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See detailImages fixes, cadre mobile. Fantômes de cinéma dans la bande dessinée expérimentale contemporaine
Belloi, Livio ULg

Conference (2014, April 02)

La présente communication porte sur la bande dessinée expérimentale contemporaine et se focalise plus particulièrement sur "Travelling Square District" (2010) du jeune dessinateur belge Greg Shaw. Objet ... [more ▼]

La présente communication porte sur la bande dessinée expérimentale contemporaine et se focalise plus particulièrement sur "Travelling Square District" (2010) du jeune dessinateur belge Greg Shaw. Objet très singulier, cet album se présente comme une expérimentation systématique autour du cadre mobile, dans un art fondé sur des successions d'images fixes. En cela, cette œuvre peut être considérée comme relevant d'une para-histoire du cinéma. [less ▲]

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See detailFirst evidence of a volatile sex pheromone in the invasive Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)
Fassotte, Bérénice ULg; Fischer, Christophe ULg; Durieux, Delphine ULg et al

Conference (2014, April 02)

Data about sex pheromones, or any semiochemicals that play a role in Coccinellid mating, remain limited. Since years, various studies and behavioral observations have hypothesized that such molecules are ... [more ▼]

Data about sex pheromones, or any semiochemicals that play a role in Coccinellid mating, remain limited. Since years, various studies and behavioral observations have hypothesized that such molecules are involved in sexual communication of ladybeetles. In this study, we collected volatile organic compounds released by virgin females of the multicolored Asian ladybeetle, Harmonia axyridis (Pallas), which were either allowed or not allowed to feed on aphids. In the presence of aphids, virgin females exhibited “calling behavior”, which has been associated with the emission of a sex pheromone in several Coleoptera species. Bioassays showed that these females released a blend of volatile compounds that is involved in the attraction of males. Gas Chromatography-Mass Spectrometry analyses highlighted specific volatile cues emanating from females, whereas males did not produce these compounds. Five components were identified: (–)-β-caryophyllene, β elemene, methyl-eugenol, α humulene, and α bulnesene. All compounds were produced after virgin females were fed aphids, and their quantity increased across the experimental period. The results confirm that female H. axyridis produce a volatile sex pheromone. Therefore, this study provides important biological information that could promote the development of efficient pest control management methods to manipulate the movements of this invasive ladybeetle, and to reduce its negative impacts on biodiversity. [less ▲]

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See detailApport des examens biologiques en pratique allergologique
GADISSEUR, Romy ULg

Conference (2014, April 02)

Apport des examens biologiques en pratique allergologique

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See detail« Penser avec et contre Fanon : sur Achille Mbembe, ‘’Le fouet de Dieu’’ (in De la postcolonie) »
Melice, Anne ULg

Conference (2014, April 01)

Achille Mbembe remarque, pour le regretter, que la réflexion qu’il a intitulée « Le fouet de Dieu » n’a guère fait l’objet de lectures critiques. C’est précisément à dégager les enjeux de ce chapitre de ... [more ▼]

Achille Mbembe remarque, pour le regretter, que la réflexion qu’il a intitulée « Le fouet de Dieu » n’a guère fait l’objet de lectures critiques. C’est précisément à dégager les enjeux de ce chapitre de son livre De la postcolonie que vise mon intervention. J’avais été très impressionnée, lors de mes recherches doctorales sur le kimbanguisme, par les analyses relatives au christianisme figurant dans Afriques indociles. Ces thèses sont tout à la fois creusées et déplacées dans « Le fouet de Dieu ». L’avant-propos de la deuxième édition du livre suggère brièvement une mise en perspective stimulante de ces pages. Prenant acte de la nécessité de désormais « penser avec et contre Fanon », Mbembe y souligne qu’elles ouvrent sur une conception du rapport éthique à autrui, qui prend chez lui la forme d’une prescription inconditionnelle : « donner la mort à la mort ». Mon interrogation se resserre autour de la thématique de l’altérité. En rassemblant en gerbe les problématiques du désir, de la domination et de la liberté, elle met au jour l’articulation profonde du religieux et du politique. [less ▲]

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See detailNeuropathies proximales du membre supérieur
WANG, François-Charles ULg

Conference (2014, April 01)

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See detailComportements à risques et maladies cardio-vasculaires, comment infléchir le cours des choses?
Krzesinski, Jean-Marie ULg; andre, Jean-François

Conference (2014, April 01)

Entre recommandations, croyances et attitudes des médecins, croyances, attitudes et vécu des patients, comment améliorer la prévention dans le domaine cardio-vasculaire?

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See detailStudy of the Bacillus subtilis PBP4* and RacX, YlmE racemases in relation with disassembly of biofilms
Vanden Broeck, Arnaud ULg

Conference (2014, April 01)

Bacillus subtilis is a PGPR (Plant Growth Promoting Rhizobacterium) Gram positive bacterium and a model for studying the in vitro formation or disruption of biofilms. At the liquid/air interface of ... [more ▼]

Bacillus subtilis is a PGPR (Plant Growth Promoting Rhizobacterium) Gram positive bacterium and a model for studying the in vitro formation or disruption of biofilms. At the liquid/air interface of standing cultures, B. subtilis forms thick pellicles of limited lifetimes. Some D-amino acids have been reported among the factors playing a role in the disassembly of B. subtilis biofilms and ylmE or racX mutants (in which the racemases YlmE or RacX are absent) show a delay in pellicle disruption. The racX encoding gene is part of a bicistronic operon in which the second gene (pbpE) codes for a Penicillin-Binding Protein, the PBP4* whose function is not characterized in Bacillus. Our studies aim to produce, purify and characterize the role of the PBP4* and RacX, YlmE racemases in relation with the disassembly of biofilms. Biochemical and structural data have been obtained and the role of the three proteins has been partly solved. X-ray structures will permit us to create inhibitor molecules against Bacillus subtilis biofilm formation or disassembly. [less ▲]

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See detailIntergenerational conflict in the first trilogy of Nuruddin Farah
Bajou, Issam ULg

Conference (2014, April)

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See detailVariation des traits fonctionnels le long d’un gradient de cuivre et cobalt : contribution du remplacement d’espèces et de la variabilité intraspécifique
Delhaye, Guillaume; Violle, Cyril; Seleck, Maxime ULg et al

Conference (2014, April)

Les collines cuprocobaltifères du Katanga sont des lieux privilégiés pour étudier la variation des traits fonctionnels le long de gradients de stress métallique. Nous avons étudié la variation de six ... [more ▼]

Les collines cuprocobaltifères du Katanga sont des lieux privilégiés pour étudier la variation des traits fonctionnels le long de gradients de stress métallique. Nous avons étudié la variation de six traits à l’échelle des espèces et de la communauté le long d’un gradient de cuivre et cobalt. D’autres paramètres tels que la concentration en phosphore et l’humidité du sol covarient positivement avec la teneur en métal du sol. Les contributions relatives du remplacement d’espèces et de la variabilité intraspécifique à la variabilité totale des traits dans les communautés ont été déterminées. A l’échelle de la communauté, la hauteur et la surface foliaire diminuent alors que les valeurs des quatre autres traits augmentent le long du gradient. Les espèces montrent des réponses variées, généralement non significatives. Pour tous les traits, le remplacement d’espèce est le moteur principal de la variation au sein des communautés. La concentration en métal du sol implique des réponses variées sur les différents traits et les différentes espèces. Nous montrons que la concentration croissante en métal privilégie le remplacement d’espèce par rapport à la variation intraspécifique et que les espèces répondent par différentes stratégies de tolérance à la concentration en métal du le sol. La variation des traits à l’échelle des communautés est essentiellement le reflet d’un changement dans les abondances des différentes formes de vie. Les espèces à xylopodes sont dominantes sur sol pauvre en métal alors que les annuelles sont dominantes sur sol très enrichi. [less ▲]

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See detailSociologie du style littéraire: introduction et conclusions
Stienon, Valérie ULg; Dessy, Clément; van Nuijs, Laurence

Conference (2014, April)

Posée à la littérature, la question du style a, de longue date, suscité engouements et suspicions. Le style littéraire est aujourd’hui considéré comme la trace écrite de l’individu et l’indice d’une ... [more ▼]

Posée à la littérature, la question du style a, de longue date, suscité engouements et suspicions. Le style littéraire est aujourd’hui considéré comme la trace écrite de l’individu et l’indice d’une distance à l’égard de la langue commune. Une telle conception participe pleinement d’une modernité littéraire ayant érigé la singularité et la nouveauté en valeurs esthétiques. En ce sens, elle est aussi le résultat d’une révision importante, à partir du milieu du XIXe siècle, de l’idéal d’un « style parfait », entendu comme un « bien écrire régi par des règles valables pour tous, respectueux de principes qui semblent défier le temps et les plumes » (Philippe 2013 : 2). Au cours de cette évolution épistémique, de norme, le style devient vecteur de création. La transition a été identifiée tantôt en termes d’« autonomisation » du champ littéraire (Bourdieu), tantôt sous l’angle du « passage d’une littérature-discours à une littérature-texte » (Vaillant) et d’un affranchissement de la rhétorique (Philippe). Dès 1753, Buffon soutient dans son Discours sur le style que « le style est l’homme même », le définissant comme la marque textuelle d’une intériorité auctoriale contrastant avec le caractère commun et extérieur des faits traités. Au cours du XIXe siècle, ces considérations sont passées sous la plume des auteurs eux-mêmes, comme l’attestent la préface d’Edmond de Goncourt à Chérie, qui revendique pour l’écrivain « une langue personnelle, une langue portant [sa] signature », et la conception de Marcel Proust, formulée dans une lettre à madame Straus de 1908, selon laquelle « la seule manière de défendre la langue, c’est de l’attaquer ». L’actualité de la recherche est animée par la question du style à travers de nouvelles perspectives qui proposent de l’étudier de manière extensive, qu’il s’agisse de l’orienter dans une perspective transdisciplinaire empruntant volontiers à l’anthropologie ou de lui conférer une dimension existentielle propre à rendre compte du vécu intime des formes et de leurs significations. Parmi ces approches qui réévaluent la part d’individualité, de créativité ou d’originalité que désigne la notion de style, la sociologie de la littérature n’est pas en reste. Pourtant, le style semble constituer pour elle un point aveugle ou un impensé, sur fond du reproche récurrent qui lui est adressé de négliger la « surface verbale » du texte littéraire (Barthes). C’est donc aux différentes possibilités d’étudier le « style littéraire » en sociologie de la littérature qu’est dédié le présent colloque. Si une place lui a été réservée par la rhétorique et si une discipline à part entière lui a été consacrée, le style semble encore résister à une approche sociologique. Les principaux points d’achoppement concernent l’intégration, dans l’analyse stylistique, des conditions matérielles de production et de réception d’une œuvre, ainsi que les corrélations à établir entre les ordres socio-économique et esthétique. De nombreuses questions restent ainsi posées : comment rendre compte des variations significatives qui engagent à la fois des conceptions artistiques et la structure du champ littéraire ? existe-t-il des définitions concurrentes du style, circulant à un même moment ? comment la sociologie littéraire peut-elle rendre compte des étapes d’une évolution qui va du respect de la norme du bien écrire à la multiplication des expressions individuelles ? [less ▲]

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See detail“Fairebel” fair milk: a multi-level innovation
Feyereisen, Marlène ULg; Melard, François ULg

Conference (2014, April)

The research focuses on the case study of the Belgian fair-trade milk “Fairebel”, which was created by dairy farmers a few months after the 2009 European milk crisis. This innovation is overseen by the ... [more ▼]

The research focuses on the case study of the Belgian fair-trade milk “Fairebel”, which was created by dairy farmers a few months after the 2009 European milk crisis. This innovation is overseen by the “Fair Milk” programme set up by the European Milk Board (EMB), a European organization of dairy farmers, which has established five fair-trade milk labels in European countries (Austria, the Netherlands, Belgium, Luxembourg, and France). At the Belgian level, the case study of the “Fairebel” project shows how the dairy system is institutionally, politically, and technically locked in. In such an irreversible system, the developers of “Fairebel” have had to use cunning and espouse some contradictions (even inconsistencies) in order to build their idea of fair-trade milk and to achieve its commercialization in the real world of commodities. Also, the “Fairebel” project is trying to increase the market power of dairy farmers and by-passes entirely the dairy industry in Belgium, which refused to support the project. For example, the developers of “Fairebel” stock up on the spot market and the Fairebel” milk cartons are produced and filled by the Luxembourg co-operative dairy Luxlait. On this level, the “Fairebel” project is more a “reorientation of trajectories” than a radical transition of the system: It uses internal resources of the main system to try to change some of its detrimental consequences, such as the prices paid to dairy farmers, without forcing through associated structural transitions. On the European level of the EMB, in which “Fairebel” participates, the transition of the system is radicalized by changing the character and the structure of the regime itself (e.g. CAP): reversal of the balance of power between dairy farmers and dairy processors, re-appropriation of the means of production by the farmers, and modification of the economic and trade rules of the dairy products (e.g., monitoring agency). Taken together, these two levels of this fair-milk innovation strengthen each other, so that the transition that “Fairebel” has inspired is more radical than it would seem when the Belgian level is considered alone. [less ▲]

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See detailModelling the Congo basin ecosystems with a dynamic vegetation model
Dury, Marie ULg; Hambuckers, Alain ULg; Trolliet, Franck ULg et al

Conference (2014, April)

The scarcity of field observations in some parts of the world makes difficult a deep understanding of some ecosystems such as humid tropical forests in Central Africa. Therefore, modelling tools are ... [more ▼]

The scarcity of field observations in some parts of the world makes difficult a deep understanding of some ecosystems such as humid tropical forests in Central Africa. Therefore, modelling tools are interesting alternatives to study those regions even if the lack of data often prevents sharp calibration and validation of the model projections. Dynamic vegetation models (DVMs) are process-based models that simulate shifts in potential vegetation and its associated biogeochemical and hydrological cycles in response to climate. Initially run at the global scale, DVMs can be run at any spatial scale provided that climate and soil data are available. In the framework of the BIOSERF project (“Sustainability of tropical forest biodiversity and services under climate and human pressure”), we use and adapt the CARAIB dynamic vegetation model (Dury et al., iForest - Biogeosciences and Forestry, 4:82-99, 2011) to study the Congo basin vegetation dynamics. The field campaigns have notably allowed the refinement of the vegetation representation from plant functional types (PFTs) to individual species through the collection of parameters such as the specific leaf area or the leaf C:N ratio of common tropical tree species and the location of their present-day occurrences from literature and available database. Here, we test the model ability to reproduce the present spatial and temporal variations of carbon stocks (e.g. biomass, soil carbon) and fluxes (e.g. gross and net primary productivities (GPP and NPP), net ecosystem production (NEP)) as well as the observed distribution of the studied species over the Congo basin. In the lack of abundant and long-term measurements, we compare model results with time series of remote sensing products (e.g. vegetation leaf area index (LAI), GPP and NPP). Several sensitivity tests are presented: we assess consecutively the impacts of the level at which the vegetation is simulated (PFTs or species), the spatial resolution and the initial land cover (potential or human-induced). First, we show simulations over the whole Congo basin at a 0.5◦ spatial resolution. Then, we present high-resolution simulations (1 km) carried out over different areas of the Congo basin, notably the DRC part of the WWF Lake Tele – Lake Tumba Landscape. Studied in the BIOSERF project, this area is characterized by a forest-savannah mosaic but also by swamp and flooded forest. In addition, forward transient projections of the model driven with the outputs of about thirty global cli- mate models (GCMs) from the new Coupled Model Intercomparison Project Phase 5 (CMIP5) will permit to outline the likely response of carbon pools to changing climate over the Congo basin during the 21th century. [less ▲]

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See detailMeta-Cognitive Mystery Tales
Dechêne, Antoine ULg

Conference (2014, April)

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See detailThe role of segmentation and investor recognition through the lens of cross-listing activity
Mouchette, Xavier ULg; Muller, Aline ULg; Carrieri, Francesca

Conference (2014, April)

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See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien ULg; Heuchenne, Cédric ULg

Conference (2014, April)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the ... [more ▼]

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the traditional approach, we don't use any GARCH-type estimation of the conditional variance. Instead, we propose to use a recently developed nonparametric procedure (Mercurio and Spokoiny, 2004): the Local Adaptive Volatility Estimation (LAVE). The motivation for using this method is to avoid a possible model misspecification for the conditional variance. In a second step, we suggest a set of estimation and model selection procedures (Berk-Jones tests, kernel density-based selection, censored likelihood score, coverage probability) based on the so-obtained residuals. These methods enable to assess the global fit of a given distribution as well as to focus on its behavior in the tails. Finally, we illustrate our methodology on three time series (UBS stock returns, BOVESPA returns and EUR/USD exchange rates). [less ▲]

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See detailINFLUENCE OF WHEY PROTEIN DENATURATION ON ADHERENCE
Toure, Yetioman ULg; Rouxhet, G. Paul; Dupont-Gillain, C. Christine et al

Conference (2014, April)

This work reports on the influence of -lactoglobulin (β-LGB) and of its denaturation on the adherence of quartz particles, taken as a model of particulate soil, on stainless steel AISI 304 with mirror ... [more ▼]

This work reports on the influence of -lactoglobulin (β-LGB) and of its denaturation on the adherence of quartz particles, taken as a model of particulate soil, on stainless steel AISI 304 with mirror finish. The substrate was soiled with quartz suspensions in water or in β-LGB solutions as such or previously heated at 75°C, and dried at room temperature or in an oven at 75°C. Cleanability was evaluated after exposure to water in a radial flow chamber. Auxiliary characterizations were the surface tension and protein concentration of the solution, surface analysis of the substrate by X-ray photoelectron spectroscopy (XPS) and contact angle measurements. The contact of stainless steel with -LGB led to adsorption of the protein, which dominated the composition of the organic layer with respect to contaminants initially present, and was not markedly desorbed upon rinsing. The presence of β-LGB at the quartz particle/substrate interface slightly increased the adherence, which was further increased when the protein was denatured. On the other hand, denaturation of -LGB enhanced its surfactant effect at the water/air interface. Comparison with systems investigated before suggests that the influence of protein via droplet spreading and soiling particles aggregation may be of minor importance compared to direct effects on the substrate/quartz interface. Stainless steel does not behave as a hydrophilic substrate owing to its surface contamination with organic compounds. It appears suitable to examine the influence of the initial surface state of stainless steel on its behavior regarding soiling and cleaning. [less ▲]

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See detailSaturn’s elusive transpolar arc
Radioti, Aikaterini ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2014, April)

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See detailQuasi-loss of nationality - a new concept or a non-issue?
Wautelet, Patrick ULg; de Groot, Gerard-René

Conference (2014, April)

Quasi-loss of nationality : “is this a loss I see before me?” Prof. Gerard-René de Groot (University Maastricht, Aruba and Hasselt) Prof. Patrick Wautelet (University Liège) This paper focuses on ... [more ▼]

Quasi-loss of nationality : “is this a loss I see before me?” Prof. Gerard-René de Groot (University Maastricht, Aruba and Hasselt) Prof. Patrick Wautelet (University Liège) This paper focuses on situations in which a person is said never to have had the nationality of a country, even though (s)he assumed (and in many cases the authorities of the country concerned shared that assumption) that (s)he possessed that nationality. Contrary to situations of loss of nationality, where something is taken away which existed, those situations involve a decision that a nationality was never acquired. This subtle distinction between loss and non-acquisition will in most cases be lost on the persons concerned who will experience the decision as a loss of nationality. The central question of this paper is, whether these situations of quasi-loss differ so much from loss cases, that they have to be treated differently. If and insofar as this would be the case, a next question is, whether a person should under certain circumstances be protected against quasi-loss of her or his nationality. In order to answer these questions, the paper will first attempt to map out situations of quasi-loss in EU member states. Typical cases will be described in which a person did never acquire the nationality of the country, although (s)he was considered as a national before certain facts happened. Drawing on this taxonomy, the paper will offer a first attempt at uncovering whether national, European and international law offer some protection, and if yes, to which extent, for situations of quasi-loss. This paper will conclude with outlining best practices which Member States should comply with in handling quasi-loss situations. [less ▲]

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See detailHepatitis E virus infection in suids and cervids in southern Belgium
Thiry, Damien ULg; Mauroy, Axel ULg; Fett, Thomas ULg et al

Conference (2014, April)

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See detailSTI narratives in Wallonia: A complex interplay
Charlier, Nathan ULg

Conference (2014, April)

It is widely acknowledged that scientific research and science, technology and innovation (STI) policies within the US and the EU have gone through deep changes for about 30 years. Many scholars from ... [more ▼]

It is widely acknowledged that scientific research and science, technology and innovation (STI) policies within the US and the EU have gone through deep changes for about 30 years. Many scholars from science and technology studies and innovation studies have investigated these policy changes, and the publication of “The New Production of Knowledge” (Gibbons et al., 1994) paved the way for vigorous debates on regimes of knowledge production (Hessels & Van Lente, 2008). While different general models were proposed to describe a transition (see, e.g. “mode 2 production of knowledge”, “post normal science”, “strategic science”, “academic capitalism”), these models often posit a dichotomous history, stating that a new regime simply succeeded the previous one (Rip, 2000). In a nutshell, the old regime characterized by strong public intervention and a linear conception of innovation is replaced by a new regime where research and innovation are conceived in systemic terms, regarding their strategic interest for the economy and their societal relevance. This dichotomous conception of STI policy change has been criticized regarding its historical accuracy, e.g. with Pestre (2003), showing that the autonomy of research that characterizes the old regime, or “mode 1” is While the diagnosis of these various science and technology policy studies is not to be dispraised concerning the different effects they emphasize, These macro-perspectives are of little use when it comes to study a local situation they lack acuteness to properly describe and compare empirical observation of such policy changes. This issue is even more salient for empirical work to be conducted in states where multi-level policies are crafted on different, sometimes overlapping national and regional polities. In Belgium, the case in point in my PhD researches, the above-mentioned studies are of little use to characterize the actual state and interplay of Walloon and Flemish STI systems. Hence, there is a need to develop theoretical approaches paying greater attention to local specificities and nuances. My proposal builds on an analysis of STI policies based on coexisting, and sometimes competing “narratives”. In the vein of Stone (1989) and Radaelli (2000), this paper aims at comparing the different policy narratives that circulates as rationale for STI policies in Wallonia, to identify their variants and to study their interplay. Policy narratives give meaning to complex realities, they help making sense of things, but they also contain a plot; they are articulating elements in a logical sequence (with, e.g., causalities, cf. Stone, 1989). As such, they are resources for action: they are descriptive and prescriptive. The broad literature of innovation studies, and its diffusion through the EU or the OECD already provides the Walloon STI stakeholders with different master-narratives (Sum & Jessop, 2013). So far, I could distinguish four different master-narratives in the literature as well as in Walloon stakeholders ‘discourses: • “The Knowledge-based economy” (KBE). KBE seems to be the “dominant” master-narrative today. In a nutshell, this narrative runs as follow (see OECD, 1996): knowledge is the source of economic growth. Since innovation and market success are better encountered through network management and the intertwinement of industry and university, STI institutions must be organized accordingly, in order to achieve a sustained growth and a “better competitiveness” o Variants of this narrative are, e.g. the triple-helix model (Etzkowitz & Leydesdorff, 2000), or National innovation system (Freeman, 1987, Lundvall, 1988). • Grand societal challenges: This recent master-narrative is being promoted by the OECD and the EU (see, e.g., Lund Declaration, 2009). It states that scientific research should benefit of high (public) funding in certain areas, or regarding certain issues. High means for strategic research should help to solve major problems such as climate change, ageing population, energy supply and consumption, cancer, etc. This narrative calls for mission oriented STI policy, so the concern here is not (solely/primarily) economic (Kallerud et al 2013). • “Science, the endless frontier” - continued: famously reported by V. Bush (1945), this master-narrative is still of common use among STI stakeholders. With this narrative, science is considered a public good, the state has to fund it because the linear conception of innovation and serendipity assure technological and economic progress in the end – the rationale is based on economic aspects (the state must fund research because it is a special kind of good and the market efficiency will not work, and basic research is the source of marketable innovation). • “Science for the sake of science”: in this narrative, science is considered as common good regardless of the potential economic impacts (and usefulness to address other societal issues) – we can make a parallel with the idea that artistic creation is worth it: for the beauty, for the critique, science here is considered as a superior activity that brings rationality and knowledge to the society as long as it is independent from “external influences” (Bonneuil & Joly, 2013) – cf. “mertonian Ethos” of Communalism, Universalism, Disinterestedness, Originality and Skepticism. Other examples / variants of this narrative include the idea that science contributes to the greatness of Nation, that science fights obscurantism, and so on and so forth. (examples : peer review, excellence, Copernican revolution are compatible storylines with science for the sake of science : a self-supporting system) While these master-narratives are present in international, academic literature, this paper focuses on their local manifestations. This study compares three critical moments: in different situations, various STI stakeholders (government, researchers, administrative staff, journalists, academic authorities, etc.) publicly expressed their views on the organization and funding of scientific research and innovation activities, and the role of STI within the region. I analyzed the discourses in press articles, policy documents, public statements, allocutions and opinion paper, blogs, etc. I intentionally sampled for heterogeneity since I’m looking for variations and multiple use of narratives. The analysis of the Walloon case permits to overcome the double dichotomy of dominant vs. counter narrative and old vs. new regime. The different narratives, in context, are concurrent but they are not mutually exclusive: while the narratives purport different ideologies, different visions of the role of science and of the state intervention, one is not being erased by the advent of another. Rather, I could find out that narratives “overlap”, and one narrative does not constitute the only resource of a (group of) actors. In situation, the actors use one or multiple narratives, regarding the context, the public, the goal of a policy, etc., in a dynamic of conflict or compromise. This description of the transition is more accurate than the one provided with a sequence of two regimes, since the flexible use of multiple narratives accounts for the continuity of certain institutions (justified by, e.g., a version of “science for the sake of science”) as well as for certain reforms in STI policy (that are inspired by the KBE narrative, for example). [less ▲]

Detailed reference viewed: 34 (6 ULg)
See detailL'impact de la charge vocale sur la rééducation
Morsomme, Dominique ULg; REMACLE, Angélique ULg

Conference (2014, March 29)

Detailed reference viewed: 42 (6 ULg)
See detailFrom the Gymnasium to the Agora: Hermes and his Cult-Epithets
Paul, Stéphanie ULg

Conference (2014, March 29)

Detailed reference viewed: 12 (2 ULg)
See detailApport des examens biologiques en pratique allergologique
GADISSEUR, Romy ULg

Conference (2014, March 29)

Apport des examens biologiques en pratique allergologique

Detailed reference viewed: 15 (5 ULg)
See detailLa charge vocale
REMACLE, Angélique ULg; Morsomme, Dominique ULg

Conference (2014, March 29)

Detailed reference viewed: 41 (3 ULg)
See detailIntermediaries, transport costs and interlinked transaction
Tharakan, Joseph ULg

Conference (2014, March 28)

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See detailMethodological approach of identity construction & strategies of allophones in Belgium
Dassargues, Alix ULg; Perrez, Julien ULg

Conference (2014, March 28)

In België bestaat er een nauwe band tussen talen (Nederlands-Frans) en regionale identiteiten (Vlaming-Waal). Echter, de aanwezigheid van Franstaligen in Vlaanderen en van Nederlandstaligen in Wallonië ... [more ▼]

In België bestaat er een nauwe band tussen talen (Nederlands-Frans) en regionale identiteiten (Vlaming-Waal). Echter, de aanwezigheid van Franstaligen in Vlaanderen en van Nederlandstaligen in Wallonië laat zien dat deze band niet automatisch is. Deze twee (onder)bevolkingsgroepen lijken dus een ideaal studiemateriaal om de ingewikkelde relatie tussen taal (talen) en identiteit(en) te bestuderen. Ondanks de belangstelling van verschillende disciplines (onder meer politieke wetenschappen, geschiedenis, sociologie en taalkunde) voor dit onderwerp, valt het toch op dat deze bevolkingsgroepen nog nooit onderzocht werden. In dit onderzoeksproject willen we daarom aan de hand van biografische gesprekken nagaan (i) hoe deze minoriteitsgroepen in een anderstalige context hun identiteit opbouwen, en (ii) in hoeverre ze identiteitsstrategieën gebruiken naargelang van de communicatiecontext waarin ze zich bevinden. Om deze vragen te beantwoorden, zullen biografische gesprekken verzameld worden die die vanuit het interdisciplinaire perspectief van de sociologie, de sociale psychologie, de sociolinguïstiek en de taalkunde geanalyseerd zullen worden. In deze bijdrage zullen we specifieker ingaan op de methodologie die wij zullen gebruiken om deze biografische gesprekken te analyseren. We zullen meer bepaald uitgaan van een tweeledige analyse van identiteitsmarkeerders. Ten eerste zullen we een semantische studie van de identiteitscategorieën verrichten, door de lexicale eenheden te bestuderen die door de informanten gebruikt worden om hun identiteit te omschrijven. Het is hiermee de bedoeling om de sociale categorieën die de respondenten gebruiken verder in kaart te brengen. Ten tweede zullen wij een psychosociale studie van de identiteitsstrategieën van de informanten verrichten. Vanuit dit perspectief kan een identiteit beschouwd worden als het resultaat van de interactie tussen een “identiteit voor zichzelf” en een “identiteit voor de anderen”. In dit onderdeel van onze studie willen we de persoonlijke identiteitsstrategieën van de informanten aan het licht brengen onder meer door hun identiteitskeuzes, zoals bijvoorbeeld de keuze voor een taalvariëteit in een bepaalde communicatiecontext, nauwkeurig te bestuderen. Deze tweedelige methode zal het mogelijk maken om de relatie tussen taal en identiteit in België beter te begrijpen en nauwkeuriger te kunnen omschrijven. [less ▲]

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See detailQuaternary rainforests of the Northern Congo Basin: contribution of charcoal analysis
Morin-Rivat, Julie ULg; Bremond, Laurent; Gillet, Jean-François ULg et al

Conference (2014, March 27)

In comparison with the wood charcoals uncovered in the soils of the temperate regions, charcoals from the tropical regions remain little studied yet, in particular those from the dense humid forests of ... [more ▼]

In comparison with the wood charcoals uncovered in the soils of the temperate regions, charcoals from the tropical regions remain little studied yet, in particular those from the dense humid forests of Central Africa. Here we aim at showing the interest of the analysis of soil charcoals so as to understand the current environments through some examples of taxonomical identifications conducted on charcoals sampled in several soil pits in Cameroon and in the Republic of the Congo. These charcoals were hand-split then observed under an incident light microscope. The anatomical features that are hold in the charcoals and described according to a standard method were compared to wood samples from the reference collection of the RMCA. Results demonstrated that the identified species are still present in the vegetal environment today and that only limited changes occurred over the past two millennia. Charcoal analysis can thus allow a better understanding of the past history of the forests in relationship with the ancient disturbances. The temporal and spatial framework of human settlements as well as the impact of the colonial period on the evolution of the forest is also discussed. [less ▲]

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See detailSpanish Saints in the Spanish Netherlands
Delfosse, Annick ULg

Conference (2014, March 27)

In the seventeenth century, the Roman proclamations of beatification or canonization generated a large number of festivities and spectacular events in many parts of the Monarchy of Spain. Yet, in the ... [more ▼]

In the seventeenth century, the Roman proclamations of beatification or canonization generated a large number of festivities and spectacular events in many parts of the Monarchy of Spain. Yet, in the Netherlands, they received a fainter echo and left a limited number of sufficiently documented testimonies. Two cases, however, are exceptions: the canonization of Ignatius of Loyola and Francis Xavier triumphantly celebrated by the Belgian Jesuits in 1622, and the beatification of Francisco Borgia in 1624, i.e., the elevation to the Catholic pantheon of three Spanish saints rejoiced by an order marked by its hispanophile nature, in provinces recently returned to the Spanish Crown. I will seek to define the Hispanic features of these events and I will particularly stress the very noticeable way how the Spanish communities, present in the Low Countries, committed themselves in these festivities. [less ▲]

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See detailÂgisme et jeunisme : conséquences trop méconnues …!
Adam, Stéphane ULg

Conference (2014, March 27)

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Peer Reviewed
See detailProgramming of neuroendocrine self-tolerance in the thymus and its defect in the development of neuroendocrine autoimmunity
Geenen, Vincent ULg

Conference (2014, March 27)

The thymus may be compared to a computer highly specialized in the programming of central immunological self-tolerance. A unique thymus first appeared some 500 million years ago in cartilaginous fishes ... [more ▼]

The thymus may be compared to a computer highly specialized in the programming of central immunological self-tolerance. A unique thymus first appeared some 500 million years ago in cartilaginous fishes, at the same time or shortly after the emergence of the adaptive immune system. A new paradigm of neuroendocrine self-peptides has been proposed, together with the definition of neuroendocrine self. Neuroendocrine self-peptides are secreted by thymic epithelial cells (TECs) not according to the classic model of neurosecretion, but are processed for presentation by the thymic major histocompatibility complex (MHC) machinery. The autoimmune regulator (AIRE) gene/protein controls the transcription of neuroendocrine genes in TECs. Presentation of neuroendocrine self-peptides in the thymus is responsible for the clonal deletion of self-reactive T cells directed toward neuroendocrine antigens, which emerge during the random recombination of gene segments encoding variable parts of the T cell receptor for the antigen (TCR). Quite paradoxically, neuroendocrine self-peptide presentation in the thymus also generates regulatory T (tTreg) cells that inhibit, in the periphery, those self-reactive T cells having escaped thymic negative selection. Several arguments indicate that the origin of autoimmunity directed against neuroendocrine glands results from a primary defect in the intrathymic programming of self-tolerance to neuroendocrine principles. This defect may be genetic or acquired, for example during a viral infection. This novel knowledge of normal and pathologic functions of the thymus constitutes a solid scientific basis for the development of a novel type negative self-vaccination against type 1 diabetes. (Supported by NFSR of Belgium, Wallonia and FP6 Eurothymaide.) [less ▲]

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See detailVan het klassieke China naar het moderne Amsterdam: oosterse invloeden in de poëzie van Hans Faverey
Dieu, Véronique ULg

Conference (2014, March 27)

That a modern Dutch poet should have found inspiration in Classical Chinese poetry and philosophy may seem rather unlikely. Yet, the contents of his personal library and a number of statements made in ... [more ▼]

That a modern Dutch poet should have found inspiration in Classical Chinese poetry and philosophy may seem rather unlikely. Yet, the contents of his personal library and a number of statements made in interviews reveal how Hans Faverey (1933-1990) had a great interest in oriental literature, art and thought (especially Taoism and Buddhism). Although many articles have been devoted to the use and function of intertext in Faverey’s poetry, scant attention has been paid to the possible influence of Chinese philosophers and poets on his work. I will argue that Faverey’s obsession with themes like emptiness, stillness and silence may be interpreted as an attempt to integrate some fundamental Taoist and Buddhist ideas into his writing. Taking Faverey’s oriental library as my starting point, and contextualizing it with reference to Tang dynasty poets such as Wang Wei and Li Shang-Yin, and quotations from Kung Sun Lung and the School of Names, I aim to shed a clearer light on those possible connections. The first part of my paper will focus on a number of general concepts from Chinese literature and philosophy, and discuss how Faverey assimilated these concepts into his own poems. The second part of my presentation will be devoted to a comparison between the Tao as text and a selection of Faverey’s work in order to highlight possible parallels in their use of symbols and imagery. Since Faverey, as a poet, was constantly working with and thinking about the written word, he may have been struck not only by Chinese philosophy itself but also by the way in which these thoughts had found their expression in language. The structure of the Chinese language and its penchant for paradoxical turns of phrase may have held an additional appeal for the Amsterdam poet, renowned for his pithy, hermetic writing style that abounds in paradoxes and uncommon allusions. [less ▲]

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Peer Reviewed
See detailInternational Law's Belgian Jurists and WWI. Cosmopolitanism of an Elite, Globalization of a Country (Montreal International Colloquium, March 2014)
Genin, Vincent ULg

Conference (2014, March 26)

Our doctoral research is conducted at the University of Liege, under the supervision of Professor Philippe Raxhon (Contemporary History). This work falls within the interuniversity and interdisciplinary ... [more ▼]

Our doctoral research is conducted at the University of Liege, under the supervision of Professor Philippe Raxhon (Contemporary History). This work falls within the interuniversity and interdisciplinary project “commemorating WWI” launched by the Fédération Wallonie-Bruxelles (French Community), the Steering Group of which is led by Professor Laurence Van Ypersele (Université Catholique de Louvain). The research focuses on the following topic: Experiences and remembrance of Belgian jurists on issues of international law during the First World War (1914-1918). Belgium, that had been neutral since its independence in 1831, soon became an active reflection centre and a land of innovation for international law, as shown by the foundation of the Institute of International Law (IDI) in Ghent in 1873. Belgium’s neutrality was violated in August 1914 and its territory, the only one, was occupied at 90% by the Germans, putting the country in a unique position that encouraged its International Law experts to revise their practices in view of their experiences and their remembrance of war. As a matter of fact, between 1918 and 1940, they held a prominent position on a global scale (LN, etc.). How the field of these law experts, its practices, its networks (European/American) and its international influence (1873-1940) evolved as a result of WWI lies at the heart of our thesis. [less ▲]

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See detailValuation and price expectation mismatch in SME business transfer
Lambert, Marie ULg

Conference (2014, March 26)

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See detailA new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)
Kleyntssens, Thomas ULg; Esser, Céline ULg; Nicolay, Samuel ULg

Conference (2014, March 25)

This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is impossible to ... [more ▼]

This talk follows "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part I)" given by Céline Esser. For real-life signals, it is impossible to compute the spectrum of singularities by using its definition. A multifractal formalism is used to approximate this spectrum. We present a new multifractal formalism for non concave and non increasing spectra based on wavelet leaders. In this talk, an implementation of this formalism is given and several numerical examples are presented. [less ▲]

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See detailA multifractal-based climate analysis
Deliège, Adrien ULg; Nicolay, Samuel ULg

Conference (2014, March 25)

This work consists of a multifractal analysis of surface air temperature in Western and Eastern Europe. The wavelet leaders method enables us to exhibit the monofractal nature of these signals. Then, we ... [more ▼]

This work consists of a multifractal analysis of surface air temperature in Western and Eastern Europe. The wavelet leaders method enables us to exhibit the monofractal nature of these signals. Then, we define a climate classification relying on the Zygmund-Hölder spaces and show that it matches the Köppen classification. By doing so, we evidence the existing relation between the regularity of the temperature data (obtained through functional spaces) and the type of climate. Finally, we give a climatic interpretation of these results. [less ▲]

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See detailAgisme : quelles conséquences pour nos aînés?
Schroyen, Sarah ULg; Marquet, Manon ULg

Conference (2014, March 25)

Detailed reference viewed: 25 (3 ULg)
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See detailAbout the Multifractal Nature of Cantor's Bijection
Simons, Laurent ULg; Nicolay, Samuel ULg

Conference (2014, March 25)

In this talk, we present the Cantor's bijection between the irrational numbers of the unit interval [0,1] and the irrational numbers of the unit square [0,1]². We explore the regularity and the fractal ... [more ▼]

In this talk, we present the Cantor's bijection between the irrational numbers of the unit interval [0,1] and the irrational numbers of the unit square [0,1]². We explore the regularity and the fractal nature of this map. This talk is based on a joint work with S. Nicolay. [less ▲]

Detailed reference viewed: 22 (4 ULg)
See detailCompact quadratizations of nonlinear binary optimization problems
Crama, Yves ULg; Rodriguez Heck, Elisabeth ULg

Conference (2014, March 25)

Detailed reference viewed: 38 (14 ULg)
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See detailA Weak Local Irregularity Property in $S^\nu$ spaces
Clausel, Marianne; Nicolay, Samuel ULg

Conference (2014, March 25)

Detailed reference viewed: 13 (4 ULg)
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See detailA new multifractal formalism based on wavelet leaders : detection of non concave and non increasing spectra (Part I)
Esser, Céline ULg; Kleyntssens, Thomas ULg; Nicolay, Samuel ULg et al

Conference (2014, March 25)

Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting to ... [more ▼]

Multifractal analysis is concerned with the study of very irregular signals. For such functions, the pointwise regularity may change widely from a point to another. Therefore, it is more interesting to determine the spectrum of singularities of the signal, which is the Hausdorff dimension of the set of points which have the same Hölder exponent. The spectrum of singularities of many mathematical functions can be determined directly from its definition. However, for many real-life signals, the numerical determination of their Hölder regularity is not feasible. Therefore, one cannot expect to have a direct access to their spectrum of singularities and one has to find an indirect way to compute it. A multifractal formalism is a formula which is expected to yield the spectrum of singularities from quantities which are numerically computable. Several multifractal formalisms based on the wavelet coefficients of a signal have been proposed to estimate its spectrum. The most widespread of these formulas is the so-called thermodynamic multifractal formalism, based on the Frish-Parisi conjecture. This formalism presents two drawbacks: it can hold only for spectra that are concave and it can yield only the increasing part of the spectrum. This first problem can be avoided using Snu spaces. The second one can be avoided using a formalism based on wavelet leaders of the signal. In this talk, we propose a new multifractal formalism, based on a generalization of the Snu spaces using wavelet leaders. It allows to detect non concave and non increasing spectra. An implementation of this method is presented in the talk "A new multifractal formalism based on wavelet leaders: detection of non concave and non increasing spectra (Part II)" of T. Kleyntssens. [less ▲]

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See detailRèglement Successions (650/2012) - aperçu général
Wautelet, Patrick ULg

Conference (2014, March 24)

This presentation gives a very general overview of the main principles on which the Succession Regulation is based.

Detailed reference viewed: 22 (1 ULg)
See detailThe last Neanderthals in North-West Europe and the Lincombian-Ranisian-Jerzmanowician
Flas, Damien ULg

Conference (2014, March 21)

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See detailMSC in clinics: Liver Transplantation
DETRY, Olivier ULg

Conference (2014, March 21)

For several years, mesenchymal stem cells (MSC) have been evaluated in vivo and in vitro for their immunomodulatory, anti-inflammatory, anti- ischemia-reperfusion injury and “tissue repair” properties ... [more ▼]

For several years, mesenchymal stem cells (MSC) have been evaluated in vivo and in vitro for their immunomodulatory, anti-inflammatory, anti- ischemia-reperfusion injury and “tissue repair” properties. These characteristics could make them interesting in various clinical applications, and particularly in organ transplantation. Taking advantage of our centre expertise and experience concerning MSC use in graft-versus-host disease after bone marrow transplantation and using already functioning GMP-compliant laboratory able to produce clinical-grade MSC, we initiated in 2011 a first trial exploring safety and tolerability of third party MSC infusions after kidney or liver transplantation in a prospective phase I-II study. In this study, after successful transplantation, 10 liver and 10 kidney transplant recipients under standard immunosuppressive treatment (tacrolimus, mycophenolate, steroids) receive an intravenous infusion of 1.5 - 3x106/kg of third-party MSC, on post-operative day 3+/-2. These patients are prospectively compared to the same number of liver and kidney transplant recipients who meet inclusion criteria but do not receive MSC infusion. Safety is assessed by recording side effects, including opportunistic infections and cancers. Immunosuppressive potential is evaluated by rejection episode rates, graft/patient survivals, immunohistology of 3-month (kidney) and 6-month (liver) graft biopsies, and in vitro evaluation of recipient immunity profile. In a second step, reduction (kidney) and progressive weaning (liver) of immunosuppression is attempted in recipients who received MSC. Inclusion of liver patients is now complete, and to date 3 kidney patients received MSC. Primary results will be presented, and complete 6-month liver results are expected for the end of 2014. The next step will be to assert the immunosuppressive potential of MSC after organ transplantation, and the opportunity to develop larger randomised, controlled, phase III trials. [less ▲]

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See detailNew fossils at the “Troisième caverne” of Goyet (Belgium) and the mortuary practices of late Neandertals
Rougier, H.; Crevecoeur, I.; Beauval, C. et al

Conference (2014, March 21)

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See detailInsight into the ecology of Neandertals in North-West Europe: stable isotopes and their palaeobiological implications
Wissing, C.; Bocherens, H.; Crevecoeur, I. et al

Conference (2014, March 21)

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See detailLe vécu de l'ICSI du côté de l'homme
Barbillon, Adrien ULg; Naziri, Despina ULg

Conference (2014, March 20)

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See detailChildren’s perspectives on their working lives and on public action against child labour in Burkina Faso
Wouango, Joséphine ULg

Conference (2014, March 20)

Since the end of 1990’s, there has been a growing interest to combat child labour in Burkina Faso. State actors as well as civil society organisations have started to engage themselves to urgently combat ... [more ▼]

Since the end of 1990’s, there has been a growing interest to combat child labour in Burkina Faso. State actors as well as civil society organisations have started to engage themselves to urgently combat the worst forms of child labour. The 2006 National Statistical Survey found that 41.1 % of children aged 5 to 17 years were economically active. Compared to other West African countries, Burkina Faso is said to have the highest rate of children involved in hazardous work, which is one working child out of two. In this context of renewed interest regarding child labour, working children have their say. Based on a qualitative survey, this paper is focused on the perspectives of children working in two of the eleven hazardous sectors of activity identified by the 2009 National Decree: a stone quarry located in the capital Ouagadougou and an artisanal gold mine in a northern rural area. The paper aims to better understand the experience and opinions of children at work, to describe what work means to them, the role and the benefits of work in their lives and the difficulties they encounter. The focus is also on what children (and their families) think about public action against child labour and what are their aspirations regarding the current interventions. The analysis shows that if economic reasons lead children to work in in these two sectors of activity, this not the only determinant. The wish of a large number of children (and their parents) to find other less difficult work reopens the debate on children’s right to work. The results of this study reveal that there is a need to better understand how working children and their fmailies negotiate everyday life within the socio-cultural and economic context of Burkina Faso. [less ▲]

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See detailLes enseignants à l'image. Représentations iconographiques et audiovisuelles du mouvement enseignant (1995-1996)
Lanneau, Catherine ULg

Conference (2014, March 20)

Les réformes institutionnelles de 1988-1989 ont transféré aux Communautés les compétences en matière d’enseignement. Pour la Communauté française, cette responsabilisation a très vite rimé avec la ... [more ▼]

Les réformes institutionnelles de 1988-1989 ont transféré aux Communautés les compétences en matière d’enseignement. Pour la Communauté française, cette responsabilisation a très vite rimé avec la nécessité de réaliser d’importantes économies et donc d’importantes réformes structurelles. Une première vague de protestation secoue Bruxelles et la Wallonie en 1990 mais, cinq ans plus tard, un nouveau plan d’économies préparé par la socialiste Laurette Onkelinx, Ministre-Présidente de la Communauté française, en charge notamment de l’Education, donne naissance à un long et douloureux mouvement de protestation. Celui-ci semble matérialiser la rupture entre une base enseignante proche, selon les réseaux, du PS ou du PSC, et un Exécutif au sein duquel ces deux partis fonctionnent en coalition. Réduction des dépenses, suppression de trois mille postes, fusions d’écoles, tous les ingrédients sont réunis pour que la situation soit explosive. Elle va l’être d’autant plus – et cela marquera d’ailleurs durablement les esprits – que certaines manifestations de mécontentement vont s’exprimer avec violence, s’attaquer à des symboliques fortes (la Fête de la Communauté française en septembre 1995, le 1er mai 1996) et perturber la vie privée de la Ministre et de son entourage. Notre contribution s’inscrit dans le volet « images produites ». Elle s’interrogera sur le rôle des images dans la représentation que la presse écrite généraliste a donnée du mouvement enseignant et des enseignants eux-mêmes durant ce conflit. Grâce à certaines archives numérisées, le traitement du mouvement par l’audiovisuel public pourra, lui aussi, être abordé. La photographie de presse, la caricature et le reportage ont-ils contribué à présenter le mouvement enseignant de manière objective et dépassionnée ? Ont-ils au contraire – et jusqu’à quel point ? - intégré les clichés traditionnels véhiculés sur cette catégorie socio-professionnelle (conservatisme, attachement à de supposés « privilèges »…). Quelle image est renvoyée du syndicalisme enseignant ? Comment est mise en scène la relation triangulaire entre grévistes, ministre et public de l’école (parents et élèves) ? Quels sont le poids et le rôle dévolus à chacun ? Quelle est, spécifiquement, le traitement réservé au mouvement par un journal comme La Wallonie ? Comment a-t-il accompagné en images la rupture entre le monde enseignant, la CGSP et le parti socialiste, culminant le 1er mai 1996 ? [less ▲]

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See detailPrésentation de l'Action de Recherches Concertée EpistolART
Delfosse, Annick ULg; Allart, Dominique ULg; Moreno, Paola ULg et al

Conference (2014, March 19)

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See detailImpact des matériaux biosourcés sur le climat intérieur : Un outil de calcul flexible à l'échelle de la pièce
Dubois, Samuel ULg; Lebeau, Frédéric ULg

Conference (2014, March 19)

L'impact de l'utilisation de matériaux d'origine végétale sur le climat intérieur, et donc sur le confort des occupants ainsi que la performance énergétique du bâtiment, n'est établi que partiellement ... [more ▼]

L'impact de l'utilisation de matériaux d'origine végétale sur le climat intérieur, et donc sur le confort des occupants ainsi que la performance énergétique du bâtiment, n'est établi que partiellement. Ces produits présentent des propriétés hygroscopiques et capillaires causant des phénomènes spécifiques liés aux changements de phase dynamiques au sein de la matrice poreuse. Les modèles mathématiques utilisés pour étudier leur comportement hygrothermique de manière détaillée sont souvent des modèles de paroi (dits modèles HAM - Heat Air Moisture). Cela sous-tend qu'ils nécessitent d'imposer des conditions aux limites à toutes les frontières de l'élément étudié, et ne permettent donc pas de connaître les flux de chaleur et de masse réels qu'offrent l'assemblage de matériaux vers le volume d'air intérieur. Pour y accéder, il convient d'intégrer ces modèles à la description de bilans thermique et hydrique de zones. Dans cette communication, nous présentons un modèle hygrothermique capable de simuler l'évolution temporelle du climat intérieur d'une ou de plusieurs pièces ("zones thermiques"). Il est composé d'un module HAM basé sur des équations aux dérivées partielles et caractérisant les transferts dans les matériaux de construction et développé au sein de l'environnement numérique COMSOL Multiphysics. Les équations qui le composent sont flexibles et facilement adaptables au cas expérimental modélisé ainsi qu'aux propriétés des matériaux composant les parois. En outre, on y trouve un traitement complet des phénomènes de changement de phase qui prend en compte l'impact de la température sur la capacité de stockage d'humidité du matériau. Ce premier module, est couplé à un outil caractérisant les bilans chaleur/masse au niveau de la zone à l'aide d'équations aux dérivées ordinaires. Le couplage des modèles est effectué au sein de SIMULINK, un outil de MATLAB destiné à l'étude des systèmes dynamiques. Nous appliquons ensuite ce modèle à l'étude d'un mur en ballots de paille séparant une enceinte climatique de grande taille en deux volumes d'air. Les données d'une expérience simple, un choc thermique imposé à un des volumes d'air, sont comparées aux sorties du modèle numérique. [less ▲]

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See detailUse of supercritical carbon dioxide to prepare drug-loaded polymeric sutures
Champeau, Mathilde; Tassaing, Thierry; Jérôme, Christine ULg et al

Conference (2014, March 19)

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See detailGreen and bio-inspired processes for the functionalization of surfaces
Detrembleur, Christophe ULg

Conference (2014, March 18)

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See detailEstimation de la sédimentation des retenues hydro -agricoles de Kierma et de Wedbila : Méthodologie et résultats obtenus.
Guyon, Francis; Hallot, Eric ULg; Kima, Etienne et al

Conference (2014, March 17)

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See detailEvaluation et planification des ressources en eau des petites retenues hydro -agricoles : Application du modèle WEAP aux retenues de Kierma et de Wedbila (Burkina Faso).
Razanamahandry Lovasoa, Christine; Hallot, Eric ULg; Guyon, Francis et al

Conference (2014, March 17)

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See detailTypological perspectives on learner's descriptions of spatial scene
Perrez, Julien ULg; Lemmens, Maarten

Conference (2014, March 16)

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See detailPRP and tendinopathy, from in vitro to clinical trials
Kaux, Jean-François ULg

Conference (2014, March 15)

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See detailRetour au travail après une absence de longue durée
Mairiaux, Philippe ULg

Conference (2014, March 14)

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See detailUne brochure, trois langues, trois cultures ?
Letawe, Céline ULg; Rasier, Laurent ULg

Conference (2014, March 13)

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See detailOpen-source CAT software: R packages and Concerto
Magis, David ULg

Conference (2014, March 12)

Together with the investigation of new or updated CAT procedures, it is of primary importance to ensure development of appropriate, flexible and useful CAT software. Open-source CAT algorithms have been ... [more ▼]

Together with the investigation of new or updated CAT procedures, it is of primary importance to ensure development of appropriate, flexible and useful CAT software. Open-source CAT algorithms have been recently proposed and are offering very promising tools for future practical CAT implementations, though yet under development. After a brief overview of available (commercial) software, I will present and compare the characteristics of some open-source R packages as CAT solutions: catR (Magis, & Raîche, 2012), catIrt (Nydick, 2013) and MAT (Choi, 2011), as well as the R-based software Firestar (Choi, 2009). A more complete description of catR will be given and (depending on time and computer constraints) a short illustrative session will be proposed. Finally, the web platform Concerto (Kosinski & Rust, 2011) will be shortly introduced. References: Choi, S. W. (2009). Firestar: Computerized adaptive testing simulation program for polytomous item response theory models. Applied Psychological Measurement, 33, 644-645. Choi, S. W. (2011). MAT: Multidimensional Adaptive Testing (MAT). R package version 0.1-3. Kosinski, M., & Rust, J. (2011). The development of Concerto: An open source online adaptive testing platform. Paper presented at the International Association for Computerized Adaptive Testing, Pacific Grove, CA. Magis, D., & Raîche, G. (2012). Random generation of response patterns under computerized adaptive testing with the R package catR. Journal of Statistical Software, 48 (8), 1-31. Nydick, S. W. (2013). catIrt: An R package for simulating IRT-based computerized adaptive tests. R package version 0.4-1. [less ▲]

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See detailWhat is the role of the VLTI in the study of particle acceleration in massive binaries?
De Becker, Michaël ULg

Conference (2014, March 12)

Among massive binaries, a fraction is known to accelerate particles up to relativistic energies. The acceleration process is believed to take place in the wind-wind interaction region, and most of these ... [more ▼]

Among massive binaries, a fraction is known to accelerate particles up to relativistic energies. The acceleration process is believed to take place in the wind-wind interaction region, and most of these systems are identified through the production of synchrotron radiation in the radio domain. Considering the crucial role played by binarity in the physics of particle acceleration, tools such as the VLTI appear to be highly relevant to explore the basic properties of this population of objects. A few recent results and prospects for future studies will be briefly presented. [less ▲]

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See detailOndes de choc et tendinopathies : expérience clinique du CHU de Liège
Kaux, Jean-François ULg

Conference (2014, March 11)

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See detailPerforming Emotions at the Canonization of St. Ignatius and St. Xavier
Delfosse, Annick ULg; Vermeir, Koen; Delbeke, Maarten et al

Conference (2014, March 08)

This paper will approach the celebrations of the canonization of St. Ignatius and St. Xavier in different localities of the Southern Netherlands over the course of 1622 as performances of emotion. We will ... [more ▼]

This paper will approach the celebrations of the canonization of St. Ignatius and St. Xavier in different localities of the Southern Netherlands over the course of 1622 as performances of emotion. We will analyze little known visual and textual testimonials of festivals and theatrical representations in Antwerp, Douai, Brussels, Dunkerque and Leuven to examine which means were used to represent, convey and enhance emotions, which actors were involved, how emotions were meant to address and affect the audience, and to what end emotions were activated. The double canonization of 1622 consecrated the Jesuits as stalwarts of the Roman papacy. In the Southern Netherlands, the celebrations of 1622 were a key moment in confirming the legitimacy of the order by displaying both how it was embedded in the local political and religious arena, and how it mastered the most advanced artistic means to support its mission. After a sketch of the celebrations and their political and religious context, we will analyze how and why emotion was performed in three steps. The sources attach enormous attention to the material, architectural and urban setting of the celebrations, by emphasizing the splendor and artistic sophistication of the events, and by pointing out the prestigious patronage that had accrued around them. We will examine whether and how the sources charged the material context of the celebration with emotion. What was the intended effect of this context on the audience? How did this context enable the performance of emotion in different forms of public display (pageantry, performances, …)? In order to answer this last question, in a second step we will have a closer look at the Triumphus dedicated to St Ignatius and St. Xavier performed in Brussels. We will examine how, in this ensemble, the material context is activated by the movement of the viewer. The description of the Triumphus singles out moments of transition as instances of heightened emotivity, suggesting that emotions are not mobilized by singular details but by overall views that impress themselves when the beholder crosses a treshold. In a third step we will describe the intended effect of the performance of emotions as a sacer horror, the bodily manifestation of religious awe, the organic sensation of respect mixed with fear and wonder felt in the presence of gods or cosmic forces. The performance of emotions, engendered by multiple layers of transformation (of the material context by means of ephemeral architecture, of the views and the experiences of the viewer, and ultimately, of their affective state) was directed at effectuating a lasting change of heart. [less ▲]

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See detailL'intentionnalité comme expérience
Seron, Denis ULg

Conference (2014, March 07)

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See detailModes intentionnels
Dewalque, Arnaud ULg

Conference (2014, March 07)

Je dresse le bilan de la situation des recherches actuelles en théorie de la perception (entre représentationalisme et relationalisme), et je suggère que la voie d'investigations la plus prometteuse est l ... [more ▼]

Je dresse le bilan de la situation des recherches actuelles en théorie de la perception (entre représentationalisme et relationalisme), et je suggère que la voie d'investigations la plus prometteuse est l'intentionalisme modal. D'après l'intentionalisme modal, un état mental est individualisé par son contenu intentionnel et par son mode intentionnel. En m'appuyant sur la méthode descriptive de Franz Brentano, je propose alors un argument en faveur de cette conception: l'argument de la complétude. [less ▲]

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See detailMicroplastics caught in herring gill rakers: illustration by scanning electron microscopy
Collard, France ULg; Das, Krishna ULg; Parmentier, Eric ULg

Conference (2014, March 07)

Plastics are produced in huge quantity (280 million of tons in 2012) and more than 10% end up in the oceans. It is estimated that between 60 and 80% of all marine debris are plastics. Plastics are ... [more ▼]

Plastics are produced in huge quantity (280 million of tons in 2012) and more than 10% end up in the oceans. It is estimated that between 60 and 80% of all marine debris are plastics. Plastics are persistent and have accumulated in the oceans for several decades. Plastics may adverse wildlife in many ways: they can be ingested by marine vertebrates and cause internal wounds in the digestive tract. Plastics are also vectors of organic pollutants including. Once ingested, plastics may release these pollutants in the organism. Plastics present in the marine environment fragment in small pieces by mechanical stress and UV radiation leading to the so-called microplastics smaller than 5 mm. Little is known about microplastics ingestion and toxicity in planktivorous fish such as the herring, Clupea harengus. Planktivorous fish have gill rakers, which may function as a trap for microplastics. This study aims to describe and characterise microplastics present on gill rakers of the herring, Clupea harengus. Ten gill cavities were sampled in January 2013 in the Channel and the North Sea during a fishery campaign organized by the IFREMER. Gills cavities were placed in a fixating solution until preparation for scanning electron microscopy (SEM). SEM was used in order to detect microplastics which are too small to be observed by a dissection microscope, to compare them with the distance between gill rakers and to characterise the surface and the shape of microplastics. Scanning electron microscopy revealed large variety of microplastics, which lengths ranged from 0.05 to 5mm. Relationship between microplastics length and distance between gill rakers was analysed on the same branchial arch. The present study revealed the presence of microplastics in an edible species of high economic value and raise question about potential impact on the herring and its consumers, including human beings. [less ▲]

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See detailEarly neuropsychological detection of Alzheimer's disease
Bastin, Christine ULg

Conference (2014, March 06)

Considering that brain pathology due to Alzheimer’s disease starts many years before the clinical symptoms become evident, subtle cognitive changes may exist already in the predementia phase. Different ... [more ▼]

Considering that brain pathology due to Alzheimer’s disease starts many years before the clinical symptoms become evident, subtle cognitive changes may exist already in the predementia phase. Different approaches have been used to detect initial cognitive impairments indicative of Alzheimer’s disease. One approach is the assessment of the predictive power of neuropsychological tools in characterizing patients with stable mild cognitive impairment (MCI) versus MCI patients who subsequently develop Alzheimer’s disease. Another approach is the longitudinal evaluation of large cohorts of older adults in population-based studies. Findings from several studies suggest that a memory test that ensures deep encoding of information and assesses retrieval with free as well as cued recall is a useful tool to distinguish patients at an early stage of Alzheimer disease from MCI non-converters. Impaired semantic memory has also been proposed as a neuropsychological marker of predementia Alzheimer’s disease. Beyond the memory domain, category verbal fluency has been shown to predict progression to Alzheimer’s disease. Moreover, combining neuropsychological scores of memory and executive functions and neuroimaging data allows a better discrimination between stable MCI and converters than neuroimaging data alone. Altogether, it is possible to detect cognitive changes that are predictive of the typical form of probable Alzheimer’s disease already in the predementia stage. Such at risk people are thought to be the best target for therapeutic interventions. [less ▲]

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See detailEquations fantaisistes : l'argent comme ressort burlesque dans l'œuvre de Pierre La Police
Belloi, Livio ULg

Conference (2014, March 06)

Conçue comme une vaste parodie du discours médiatique en général et de la presse quotidienne en particulier, la série "Véridique !" (Cornélius, 1999-2002) du dessinateur français Pierre La Police met ... [more ▼]

Conçue comme une vaste parodie du discours médiatique en général et de la presse quotidienne en particulier, la série "Véridique !" (Cornélius, 1999-2002) du dessinateur français Pierre La Police met volontiers en scène des questions ou des rapports d’argent. Le plus souvent lié à la sphère politique, le thème de l’argent autorise l’auteur à jeter un regard narquois et particulièrement acéré sur des événements qui firent grand bruit dans la France des années 1990 (l’affaire Roland Dumas, le scandale de l’ARC, l’affaire des emplois fictifs à la ville de Paris, etc.). Ma communication étudie au plus près les mises en scène de l’argent dans l’œuvre de Pierre La Police et s'efforce de porter au jour les véritables équations mises au point à cet égard par l’auteur. Toutes à leur manière, ces équations concourent à faire du thème de l’argent un ressort burlesque à part entière ; elles participent également d’une esthétique générale de la distorsion et de l’approximation, qui est comme la marque de fabrique de Pierre La Police. [less ▲]

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