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See detailA specific example of exchange: the national churches and their corresponding "nations"
Corswarem, Emilie ULg; Berti, Michela

Conference (2014)

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See detailOrigin and evolution of the early land plants in Argentina and South America through the palynological record
Rubinstein, C.V.; Garcia Muro, V.J.; Steemans, Philippe ULg

Conference (2014)

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See detailShould I Access or Should I Own?
Hazee, Simon ULg; Delcourt, Cécile ULg; Van Vaerenbergh, Yves

Conference (2014)

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See detailLe Théâtre Flamand. Le progrès en scène.
Prina, Daniela ULg

Conference (2014)

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See detailImplementing agricultural land-use in the CARAIB dynamic vegetation model
François, Louis ULg; Jacquemin, Ingrid ULg; Fontaine, Corentin et al

Conference (2014)

CARAIB (Dury et al., iForest - Biogeosciences and Forestry, 4:82-99, 2011) is a state-of-the-art dynamic vegetation model with various modules dealing with (i) soil hydrology, (ii) photosynthesis/stomatal ... [more ▼]

CARAIB (Dury et al., iForest - Biogeosciences and Forestry, 4:82-99, 2011) is a state-of-the-art dynamic vegetation model with various modules dealing with (i) soil hydrology, (ii) photosynthesis/stomatal regulation, (iii) carbon allocation and biomass growth, (iv) litter/soil carbon dynamics, (v) vegetation cover dynamics, (vi) seed dispersal, and (vii) vegetation fires. Climate and atmospheric CO2 are the primary inputs. The model calculates all major water and CO2/carbon fluxes and pools. It can be run with plant functional types or species (up to 100 different species) at various spatial scales, from the municipality to country or continental levels. Within the VOTES project (Fontaine et al., Journal of Land Use Science, 2013, DOI:10.1080/1747423X.2013.786150), the model has been improved to include crops and meadows, and some modules have been written to translate model outputs into quantitative indicators of ecosystem services (e.g., evaluate crop yield from net primary productivity or calculate soil erosion from runoff, slope, grown species and various soil attributes). The model was run over an area covering four municipalities in central Belgium, where land-use is dominated by crops, meadows, housing and some forests and was introduced in the model at the land parcel level. Simulations were also performed for the future. In these simulations, CARAIB was combined with the Aporia Agent-Based Model, to project land-use changes up to 2050. This approach is currently extended within the MASC project (funded by Belgian Science Policy, BELSPO) to the whole Belgian territory (at 1 km2) and to Western Europe (at 20 km x 20 km). [less ▲]

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See detailDesign, modelling, performance optimization and experimentation of a reversible HP/ORC prototype.
Dumont, Olivier ULg; Quoilin, Sylvain ULg; Lemort, Vincent ULg

Conference (2014)

This paper presents an innovative system comprising a water/water heat pump connected to a solar roof and a geothermal heat exchanger. This unit is able to invert its cycle and operate as an Organic ... [more ▼]

This paper presents an innovative system comprising a water/water heat pump connected to a solar roof and a geothermal heat exchanger. This unit is able to invert its cycle and operate as an Organic Rankine Cycle. The solar roof is producing a large amount of heat throughout the year. This allows covering the building annual heating needs and furthermore, electricity is produced thanks to the surplus of heat in a so-called HP/ORC reversible unit. This paper is focusing on these three main points: modeling, design and experimentation of the prototype. This paper demonstrates the feasibility of such a prototype with encouraging performance in ORC and HP modes. First simulations of the HP/ORC system, with components optimally sized, indicate that, in ORC mode, for the weather conditions of Copenhagen, the electrical energy produced over one year reaches 4030 kWh and the nominal efficiency of the cycle is 7.6%. The nominal COP of the heat pump is 4.2 (condenser exhaust temperature of 60°C and evaporator supply temperature of 15°C). Experimentally, a COP of 4.21 (condensation temperature of 61°C and evaporation temperature of 21°C). is achieved in heat pump mode and a global ORC efficiency of 5.7% is obtained in ORC mode (condenser exhaust temperature of 25°C and evaporator supply temperature of 88°C). [less ▲]

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See detailCaractéristiques du capital foncier des exploitations agricoles dans le sud de la Belgique
Terrones Gavira, François ULg; Burny, Philippe ULg; Lebailly, Philippe ULg

Conference (2014)

En Wallonie, région située au Sud de la Belgique, les capitaux mobilisés pour l’activité agricole sont nombreux, variés mais surtout importants. Parmi les capitaux engagés, le capital foncier est l’une ... [more ▼]

En Wallonie, région située au Sud de la Belgique, les capitaux mobilisés pour l’activité agricole sont nombreux, variés mais surtout importants. Parmi les capitaux engagés, le capital foncier est l’une des composantes importantes du patrimoine de l’exploitation agricole. Ce dernier influence directement les décisions qui sont prises à long terme en son sein à savoir, sa politique d’investissement mais également les éléments relatifs à son cycle d’exploitation et à sa trésorerie. La problématique foncière ne doit donc pas être analysée de manière cloisonnée mais doit rester intégrée à la question centrale du financement des exploitations agricoles de manière générale et de la reprise des activités en particulier. Le présent article a pour but de caractériser le capital foncier en Wallonie. Après un descriptif succinct de l’agriculture wallonne, l’importance des capitaux mobilisés pour l’activité agricole en Wallonie par les principaux acteurs du monde agricole est décrite par le biais d’une approche micro-économique basée sur les données du réseau comptable organisé et géré par la Direction de l’Analyse Economique Agricole (DAEA). La deuxième partie, quant à elle, discute de la capitalisation des aides issues de la politique agricole commune (PAC) actuelle mais également future dans le foncier en Wallonie. L’approche est de type théorique et utilise les données de la littérature mais également celles du Système Intégré de Gestion et de Contrôle (SIGEC) de la Direction générale de l’Agriculture, des Ressources naturelles et de l’Environnement (DGARNE) du Service public de Wallonie (SPW), qui a en charge l’octroi des aides à l’agriculture. Enfin, la dernière partie du présent document décrit les difficultés propres aux jeunes agriculteurs et aux nouveaux entrants pour accéder au foncier en Wallonie. [less ▲]

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See detailANALYSE DES DETERMINANTS DE L'ACCES AU CREDIT DES EXPLOITATIONS AGRICOLES AU BENIN
Sossou, Comlan ULg; Dogot, Thomas ULg; Lebailly, Philippe ULg et al

Conference (2014)

Cet article analyse les facteurs structurels, comportementaux et de performance qui déterminent l’accès au crédit des exploitations agricoles au Bénin. Les données ont été collectées auprès de 475 ... [more ▼]

Cet article analyse les facteurs structurels, comportementaux et de performance qui déterminent l’accès au crédit des exploitations agricoles au Bénin. Les données ont été collectées auprès de 475 exploitations agricoles. Un modèle logit binomial a été utilisé au cours de l’analyse. Les résultats ont montré que la taille des ménages, la proximité des IMF, l’appartenance à un groupement de solidarité financière et le revenu issu de la principale culture sont les facteurs qui influencent l’accès au crédit. L’analyse des effets marginaux a indiqué que l’amélioration de la proximité des IMF et l’appartenance à un groupement de solidarité financière sont susceptibles d’augmenter significativement l’accès au crédit. Ainsi, nous recommandons l’amélioration du taux de couverture des IMF présentes au Bénin et la sensibilisation des exploitants agricoles à la formation et/ou l’adhésion à des groupements de solidarité financière. [less ▲]

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See detailClimatological influences on inland waterway transport capacity
Cools, Mario ULg; Limbourg, Sabine ULg

Conference (2014)

Climate change may affect inland waterway transport through disturbances in waterway hydrology: longer periods with strong water swells and drops. To allow fully loaded barges, the water level must be ... [more ▼]

Climate change may affect inland waterway transport through disturbances in waterway hydrology: longer periods with strong water swells and drops. To allow fully loaded barges, the water level must be neither too high (limited air draught) nor too low (limited draught). Therefore, the water level impacts the load factor of barges and thus the transportation costs. Moreover, in winter, ice jams can paralyze inland waterway traffic on the river. In this paper, the effect of various climatological changes on the capacity of inland waterway in terms of barge transport is examined. The paper focusses on the development of a methodology for assessing the sensitivity of inland waterway systems to climatological changes and takes into account an experts' opinion survey that provides insight into the perceived likelihood of the different scenarios that are investigated. The analysis focusses on the inland waterway systems in Belgium, which has the second highest density of European inland waterways. It enables the integration of inland waterway transport in the intermodal supply chain. The results are related to investment planning and management in inland waterways transport. They are intended to be interesting to researchers and to inland waterways actors developing intermodal transport as well. [less ▲]

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See detailA new and greener Common Agricultural Policy for 2015-2020 and its implementation in Wallonia
Burny, Philippe ULg

Conference (2014)

In order to implement the new Common Agricultural Policy agreed upon in 2013. the Walloon government had to make some choices, left to the Member States or the regions within them, which is the case in ... [more ▼]

In order to implement the new Common Agricultural Policy agreed upon in 2013. the Walloon government had to make some choices, left to the Member States or the regions within them, which is the case in Belgium. In July 2014, it was decided to implement the green payment (which is compulsory) proportionally to the basic payments), the payment for young farmers (compulsory) at a high level (1.8% of the total envelope for direct payments), an additional payment for the first 30 hectares (payment which is left to the choice of the Member State/region), coupled payments (as much as 21.3 % of the total amount of direct payments), and the basic payment (compulsory, representing 29.9 % of the total regional envelope for direct payments only in Wallonia). [less ▲]

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See detailThe age of river-transported carbon: new data from African catchments and a global perspective
Marwick, TR; Tamooh, F; Teodoru, CR et al

Conference (2014)

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See detailMeteorological variation in travel behaviour
Creemers, Lieve; Wets, Geert; Cools, Mario ULg

Conference (2014)

Weather causes a variety of impacts on the transportation system. This paper contributes to the weather-related transport literature by investigating the meteorological variation in revealed preference ... [more ▼]

Weather causes a variety of impacts on the transportation system. This paper contributes to the weather-related transport literature by investigating the meteorological variation in revealed preference travel data. The main objective of this paper is to investigate the impact of weather conditions on revealed activity participation (trip motives) and revealed modal choices in the Netherlands. To this end, data from the Dutch national travel household survey 2008 was matched to hourly weather data provided by the Royal Dutch Meteorological Institute. Two GEE-MNL models are constructed, namely one for modelling the impact of weather conditions on trip motive and one to assess the effect on modal choice. The parameter estimates of the weather variables indicate that, depending on which travel attribute one focuses, other factors might play a role. Nonetheless, fog, sunshine duration and temperature have a significant impact in both models. Unexpected is the fact that snow and ice cover do not play a role at all. Nonetheless, this finding can be accounted for by the relative low occurrence of these weather types in the study area. It is important to integrate these identified impacts of weather in travel demand modelling frameworks, since this will help to achieve a higher accuracy and more realistic traffic forecasts. This allows policy makers to make better long-term and short-term decisions to achieve various political goals, such as the development towards a sustainable transportation system. Further research in this regard, should emphasize on the role of weather conditions and activity-scheduling attributes. [less ▲]

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See detailA constructive heuristic for the three dimensional Bin Packing Problem with transportation constraints
Paquay, Célia ULg; Schyns, Michael ULg; Limbourg, Sabine ULg

Conference (2014)

The aim of this work is to propose a Relax-And-Fix heuristic to build a good initial solution to the 3D BPP. First, a mathematical formulation has been developed taking into account several types of ... [more ▼]

The aim of this work is to propose a Relax-And-Fix heuristic to build a good initial solution to the 3D BPP. First, a mathematical formulation has been developed taking into account several types of constraints such as the stability and fragility of the boxes to pack, their possibility to rotate, the weight distribution inside the bins and their special shapes. Since this model contains a lot of integer variables, we have decided to apply the Relax-and-Fix method. We have selected several sets of variables to be the branching variables and carried out some tests. [less ▲]

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See detailThe political participation of Congolese born again in Brussels (Belgium)
Demart, Sarah ULg

Conference (2014)

While the political participation of African born again christian has been leading to important research, few interest has been provided to the political participation of African evangelical immigrants ... [more ▼]

While the political participation of African born again christian has been leading to important research, few interest has been provided to the political participation of African evangelical immigrants. The ethos churches are calling to suggests however the existence of political expressions. Exemplarity (Lorentzen et Rosalina, 2005), « usefull immigration » (Mossière, 2006), combativity and social mobility (Demart, 2008), « virtuous citizenship » (Fumanti, 2010), etc. is the religious empowerment (Ter Haar, 1998 ; Harris, 2006 ; Adogame, 2007) translatable to political discourse, activity or alliance ? From research lead for ten years within Congolese circles in Belgium, I bring to light this issue looking at the political participation of Congolese born again from religious, associative and political lens. [less ▲]

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See detailDIMENSIONNEMENT ET EXPÉRIMENTATION D’UNE UNITÉ POMPE À CHALEUR / ORC RÉVERSIBLE
Dumont, Olivier ULg; Quoilin, Sylvain ULg; Lemort, Vincent ULg

Conference (2014)

L’union européenne doit réduire les émissions de gaz à effet de serre de 80% par rapport au niveau des années 90 d’ici 2020. Les ménages représentent 27% de la consommation finale. Dans ce cadre, les ... [more ▼]

L’union européenne doit réduire les émissions de gaz à effet de serre de 80% par rapport au niveau des années 90 d’ici 2020. Les ménages représentent 27% de la consommation finale. Dans ce cadre, les bâtiments dont la consommation d’énergie est quasi nulle (NZEB – Nearly Zero Energy Building) sont d’une importance considérable. A partir de 2019, tous les nouveaux bâtiments devront présenter une production d’énergie renouvelable supérieure à la consommation d’énergie primaire. C’est dans ce cadre que le concept de PAC/ORC prend tout son sens. Ce système innovant comprend une pompe à chaleur eau/eau (PAC) reliée à un toit solaire et à un échangeur de chaleur géothermique. Cette pompe à chaleur est également capable d'inverser son cycle et de fonctionner comme un Cycle Organique de Rankine (ORC). En utilisant le toit solaire comme source de chaleur, une grande quantité de chaleur est générée tout au long de l'année. Cette chaleur est utilisée en priorité pour couvrir les besoins de chauffage annuels et le surplus de chaleur généré au cours de l'été est utilisée pour produire de l'électricité dans l’unité PAC / ORC. L’article s’articule en 4 parties. Tout d’abord, l’introduction présente les trois modes de fonctionnement. Ensuite, les modèles des composants et l’évaluation des performances au point nominal de conception sont décrits. Par après, le dimensionnement et le choix des composants sont réalisés sur bases de simulations annuelles avec un pas de temps d’une heure. Enfin, les premiers résultats expérimentaux sont présentés. Un rendement de 5,7% est atteint en mode ORC (avec une température de condensation de 25°C et une température d’évaporation de 88°C) alors qu’un COP de 4,2 est obtenu en mode pompe à chaleur (avec une température de condensation de 61°C et une température d’évaporation de 21°C). [less ▲]

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See detailRiverine fluxes of sediments and carbon in the lower Tana River: the importance of floodplain retention
Tamooh, F.; Meysman, F.J.R.; Borges, Alberto ULg et al

Conference (2014)

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See detailPrior light history impacts on higher order cognitive brain function
Chellappa, Sarah Laxhmi ULg; Ly, Julien; Meyer, Christelle ULg et al

Conference (2014)

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See detailEvaluating functional data for the European Middle Palaeolithic
Rots, Veerle ULg

Conference (2014)

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See detailRestoring order: Inheritance disputes and shifting legal consciousness in Cotonou
Andreetta, Sophie ULg

Conference (2014)

For the purpose of this paper, I will focus on the litigants’ discourses on the law and the State in inheritance cases in Cotonou. As a matter of fact, over the last few years, the number of inheritance ... [more ▼]

For the purpose of this paper, I will focus on the litigants’ discourses on the law and the State in inheritance cases in Cotonou. As a matter of fact, over the last few years, the number of inheritance disputes handled by the Beninese state courts has drastically increased. In Cotonou, State of Persons courtrooms (Chambres Etat des Personnes) – competent with regards to family matters – are so crowded that people even have to queue outside during registration. Litigants often mention that they “referred to the state” in order to “restore order” within their families. The question is: does the legal system actually manage to meet their expectations? In order to answer that question, I will focus on the legal consciousness of Beninese families and how this shifts throughout the litigation process. How do people understand and utilize state law in inheritance cases? Why do they go to court, and what do they expect from the judiciary? How does their understanding and perception of law adjust as they experience state courts? Finally, how do the aftermath of legal proceedings and the implementation process amend their legal consciousness? Within that framework, Beninese plaintiffs often go from trusting that the state would “restore order” into their family to believing that the judiciary somehow made things even worse. While scholars have investigated how race , gender, or social status influence “the ways people understand and use the law” (Merry, 1990:5), there is however little reflection on the way legal consciousness develops throughout the litigation process. There is also a point to be made about the relationship between the law and the state. In Benin, people “refer to the State” when bringing a case to court and, through the judge, “the State” is the one solving their problems. Within that context, the way people think about and experience legal proceedings in Cotonou is as much about legal consciousness as it is about state consciousness. It is about the legitimacy and efficacy of the state in delivering public service; about governance and power. [less ▲]

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See detailPrior light history impacts on cognitive brain function
Chellappa, Sarah Laxhmi ULg; Ly, Julien; Meyer, Christelle ULg et al

Conference (2014)

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See detailFaut-il opérer un cancer du col utérin après radiochimiothérapie initiale?
Ferron, G.; DE CUYPERE, Marjolein ULg; Querleu, D. et al

Conference (2013, December 19)

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See detailPeut-on concilier la phytostabilisation des sols pollués avec la conservation des espèces cupro-cobalticoles dans la région de Lubumbashi (R. D. Congo) ?
Boisson, Sylvain ULg; Collignon, Julien; Ngoy Shutcha, Mylor et al

Conference (2013, December 19)

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See detailLe tradipraticien est un acteur crédible dans l'offre des soins en territoire périurbain: Résultats d'une étude menée dans la commune de Kisenso à Kinshasa, Congo
Manzambi Kuwekita, Joseph ULg; Mbadu Kivuidi, Véronique; Bruyère, Olivier ULg et al

Conference (2013, December 19)

Cette étude examine la perception des tradipraticiens par les populations, afin d’envisager leur intégration dans les politiques de développement de Kisenso par des focus groupes en juillet 2013. 100% de ... [more ▼]

Cette étude examine la perception des tradipraticiens par les populations, afin d’envisager leur intégration dans les politiques de développement de Kisenso par des focus groupes en juillet 2013. 100% de participants reconnaissent l’existence de tradipraticiens et les avoir déjà consultés, 80% déclarent avoir expérimenté la guérison totale. Le recours au tradipraticien est justifié par l’efficacité des soins, le type de maladie, la compétence, la proximité et la possibilité de paiement à crédit. Pour 70% des participants, le tradipraticien doit améliorer les conditions d’hygiène dans la manipulation des produits. La quasi-totalité des tradipraticiens ne sont pas autorisés à fonctionner, dû notamment au coût d’actes administratifs pour l’obtention de l’autorisation et la peur de s’ouvrir aux intellectuels. 20% d’entre eux disent collaborer avec la biomédecine pour les soins de "mbasu", 20% se déclarent spécialistes en ostéologie, 20% dans les soins de "mbasu" et 60% disent tout soigner. Si l’on veut intégrer les tradipraticiens dans les politiques de développement local, on devra supprimer le coût d’actes administratifs, leur accorder des formations, intégrer les soins traditionnels dans les paquets d’activités et leur accorder le statut d’agent de l’Etat. [less ▲]

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See detailValorisation et propriétés des substances humiques des lixiviats de décharge
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg et al

Conference (2013, December 18)

Des expérimentations ont été menées dans notre laboratoire en utilisant des substances humiques (SH) extraites des lixiviats de cEntre d’Enfouissemnt Techique et des une formulation stable de SH « ... [more ▼]

Des expérimentations ont été menées dans notre laboratoire en utilisant des substances humiques (SH) extraites des lixiviats de cEntre d’Enfouissemnt Techique et des une formulation stable de SH « Humifirst » (12%d’acides humiques et 3% d’acides fulviques) de la compagnie TRADECORP s.a. (Espagne) commercialisée sous l’appelation Humifirst en vue d’en étudier leurs effets sur le développement du système racinaire de vitro-plants de bouleau et d’aulne. Les résultats montrent qu‘un traitement à faible concentration (10ppm) pendant la phase d’élongation des racines affecte la formation des racines latérales formée en présence de SH de lixiviat avec une intensité variable selon l’espèce testée. [less ▲]

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See detaillutte contre la mortalité périnatale: actualisation de l'asphyxie périnatale
Battisti, Oreste ULg

Conference (2013, December 18)

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See detailOdour monitoring by sensors technology
Romain, Anne-Claude ULg

Conference (2013, December 18)

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See detailPattern of morpho-functional diversifcation of damselfishes (Pomacentridae)
Frederich, Bruno ULg

Conference (2013, December 18)

Coral reef fishes represent one of the most outstandingly diverse assemblages of vertebrates on the planet but our understanding of their mode of diversification remains limited. Currently, some ... [more ▼]

Coral reef fishes represent one of the most outstandingly diverse assemblages of vertebrates on the planet but our understanding of their mode of diversification remains limited. Currently, some biologists are testing various hypotheses about the evolutionary history of coral reef fishes and are exploring the factors driving their diversification. During my post-doctoral research, I explored the pattern of morphological diversification of damselfishes (Pomacentridae, 386 species). I produced a time-calibrated phylogeny based on 8 loci including 208 species and collected eco-morphological data (trophic data, body shape and oral jaws shape) in more than 120 species. Using various phylogenetic comparative methods, I have illusrated that the Pomacentridae observed repeated ecological radiation and morphological convergence during their evolutionary history. I have also highlighted the primary role of a ligament joining the mandible and the hyoid in the evolution and the morpho-functional diversification of pomacentrids. [less ▲]

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See detailL'ENMG, c'est le pied !
WANG, François-Charles ULg

Conference (2013, December 17)

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See detailAnalyse du métier de facilitateur et de son rôle dans la diffusion de normes d’emploi : le cas d’un bureau de chômage belge
Beuker, Laura ULg

Conference (2013, December 17)

En 2004, suite aux injonctions européennes en matière d’activation impulsées par les lignes directrices de 2003-2005, la Belgique met en place le PAC (ou Plan d’Accompagnement des chômeurs). Cette ... [more ▼]

En 2004, suite aux injonctions européennes en matière d’activation impulsées par les lignes directrices de 2003-2005, la Belgique met en place le PAC (ou Plan d’Accompagnement des chômeurs). Cette importante réforme prévoit – notamment – la mise en place de la procédure d’activation du comportement de recherche d’emploi par l’Office National de l’Emploi (Ou l’ONEm). Désormais, des agents sont spécifiquement dédiés à l’évaluation des efforts menés par les demandeurs d’emploi (ou DE) pour s’insérer sur le marché du travail : ce sont les facilitateurs. Si la procédure d’évaluation est officiellement définie, la décision, quant à elle, est bel et bien fonction de l’agent, qui doit interpréter le cadre réglementaire général à l’aune de la situation singulière du demandeur d’emploi. À l’aide d’une étude de cas réalisée au sein d’un bureau de chômage situé en Belgique francophone, nous allons tenter d’ouvrir la « boîte noire » du jugement des facilitateurs. À partir d’une approche qualitative cumulant des entretiens semi-directifs et de l’observation d’interactions entre facilitateurs et demandeurs d’emploi, nous montrerons que la décision des facilitateurs n’est ni arbitraire, ni déterminée. Elle est, au contraire, le fruit de la mobilisation d’une multitude d’appuis conventionnels dans l’action (Dodier, 1993). En outre, dans la lignée des travaux de Benarrosh (2000 ; 2006 ; 2012) nous démontrerons que ces agents sont des « pourvoyeurs » de normes institutionnelles précises à destination des demandeurs d’emploi. [less ▲]

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See detailAnalyse d’un dispositif de (re)mise en emploi : Le cas d’un bureau de recrutement, recherche et sélection de personnel
Gérard, Julie ULg

Conference (2013, December 17)

Au cours de ces dernières années, le souci d’allier flexibilité et sécurité au travail a conduit à l’essor considérable des métiers de l’intermédiation (Orianne et Maroy, 2008). Dans le domaine de ... [more ▼]

Au cours de ces dernières années, le souci d’allier flexibilité et sécurité au travail a conduit à l’essor considérable des métiers de l’intermédiation (Orianne et Maroy, 2008). Dans le domaine de l’accompagnement et du développement de carrière, divers dispositifs privés d’aide et de suivi ont vu le jour afin de contribuer à l’amélioration des conditions de travail et de guider les travailleurs dans leurs transitions professionnelles. Par leur action, ces nouveaux dispositifs – que nous qualifierons de dispositifs d’intermédiation – semblent complexifier les temporalités sociales en créant de nouvelles opportunités d’emploi et/ou en redéfinissant les rythmes de carrière. À l’aide d’une étude de cas réalisée dans le secteur du recrutement belge, nous analyserons la capacité d’un processus de (re)mise en emploi à remplir de tels objectifs dans un contexte de gestion mixte du marché du travail. À partir d’une approche qualitative cumulant des entretiens semi-directifs et de l’observation participante, nous montrerons qu’en plus de régir l’offre et la demande de travail, ce dispositif d’intermédiation, par son système de cooptation interpersonnelle et d’accompagnement de carrière, assure la fluidification du marché et sécurise les transitions professionnelles. [less ▲]

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

Conference (2013, December 15)

Since 2008 and its financial crisis, an increasing attention has been devoted to the selection of an adequate error distribution in risk models, in particular for Value-at-Risk (VaR) predictions. We ... [more ▼]

Since 2008 and its financial crisis, an increasing attention has been devoted to the selection of an adequate error distribution in risk models, in particular for Value-at-Risk (VaR) predictions. 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 do not use any GARCH-type estimation of the conditional variance. Instead, we propose to use a recently developed nonparametric procedure: 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 tests 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 behaviour 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 detailLittérature latino-américaine de la migration: au-delà du concept
Berlage, Pauline ULg

Conference (2013, December 13)

La littérature de la migration, encore peu développée en Europe dans le domaine hispanique est cependant un véritable courant littéraire en Amérique du Nord. Au Canada francophone, par exemple, ce courant ... [more ▼]

La littérature de la migration, encore peu développée en Europe dans le domaine hispanique est cependant un véritable courant littéraire en Amérique du Nord. Au Canada francophone, par exemple, ce courant regroupe aujourd'hui un nombre important de romans, de contes ou de poésie ainsi qu’une énorme littérature secondaire. Dans le cas de la littérature hispano-américaine en Europe, nous sommes souvent confrontés à un paradoxe à l’heure d’étudier une création littéraire dans cette perspective. En effet, l’appellation même de “littérature de la migration latino-américaine” pose question car à la fois ces romans semblent partager des traits communs avec la littérature hispanique du vingtième siècle, à la fois ces œuvres s’avèrent être innovantes tant par leurs thématiques que par les traits stylistiques qu'elles proposent. Par conséquent, comment définir le champ d’étude de la littérature de la migration latino-américaine ? Quelle serait la validité d’une telle appellation? Ne pourrait-on pas définir toute la production littéraire contemporaine comme littérature transnationale ? Voici les questions qui me sont apparues tout au long de ma recherche concernant la validité et l’éventail de possibilité que présente la notion de littérature de la migration latino-américaine. Mon objectif est donc de dépasser le débat terminologique pour souligner certaines des nombreuses questions que ce nouveau domaine de recherche suscite. [less ▲]

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See detailConclusions
Masson, Christophe ULg

Conference (2013, December 13)

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See detailRésister par ou résister à la médiation culturelle : comment évaluer les dispositifs de médiation ?
Servais, Christine ULg

Conference (2013, December 13)

Je m’interroge ici sur les moyens (scientifiques) dont nous disposons pour poser et étayer des affirmations du type : la médiation culturelle est essentielle au partage du sens et par conséquent à ce ... [more ▼]

Je m’interroge ici sur les moyens (scientifiques) dont nous disposons pour poser et étayer des affirmations du type : la médiation culturelle est essentielle au partage du sens et par conséquent à ce qu’on appelle si rapidement le “vivre ensemble”. Je voudrais proposer ceci : contrairement à ce qu’affirmait Davallon dans le numéro de MEI consacré aux méditeurs , il faut réintroduire la conflictualité dans la notion de médiation si nous voulons pouvoir l’évaluer ; si nous faisons cela , nous nous interdisons de fait toute possibilité d’une évaluation objective des dispositifs de médiation mais nous lui rendons une dimension propement politique. C’est sur une telle conception critique de la médiation qu'est basée cette intervention ; elle se réfère à un modèle fondé sur la mise en lien entre l’expérience esthétique et la possibilité d’une communauté ; ce modèle, théorisé par Kant, est très longuement commenté et interrogé par Arendt, en particulier dans La Crise de la culture et dans Juger. Sur la philosophie politique de Kant. Ces références s’inscrivent également dans le cadre théorique dessiné par les notions de malentendu et de mésentente telles qu’elles sont problématisés respectivement par Derrida et Rancière. [less ▲]

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See detailRole of MCM proteins in HTLV-1 transcription
Barez, Pierre-Yves ULg; Carpentier, Alexandre ULg; Boxus, Mathieu et al

Conference (2013, December 13)

Detailed reference viewed: 14 (2 ULg)
Peer Reviewed
See detailThe Taste of the Eye and the Sight of the Tongue
Von Hoffmann, Viktoria ULg

Conference (2013, December 13)

Detailed reference viewed: 12 (1 ULg)
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See detailDrowsiness monitoring for road safety
Wertz, Jérôme ULg; François, Clémentine ULg; Verly, Jacques ULg

Conference (2013, December 13)

Detailed reference viewed: 15 (2 ULg)
See detailAfrican Migration: on the centrality of Europe
Demart, Sarah ULg

Conference (2013, December 13)

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See detailL'ENMG dans la pathologie de la face dorsale du pied
WANG, François-Charles ULg

Conference (2013, December 13)

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See detailImaginer-lire Le Capital. Approche des Nachrichten aus der ideologischen Antike
Pieron, Julien ULg

Conference (2013, December 13)

Detailed reference viewed: 8 (0 ULg)
See detailPLS analysis of fMRI data on cognitive processes
Bahri, Mohamed Ali ULg; Genon, Sarah ULg; Bastin, Christine ULg et al

Conference (2013, December 12)

Cognitive processes like memory and self-referential are known to be underlined by extended neural networks. To study these complex processes, multivariate methods appear as the methods of the first ... [more ▼]

Cognitive processes like memory and self-referential are known to be underlined by extended neural networks. To study these complex processes, multivariate methods appear as the methods of the first choice since they take into account the functional integration. Partial Least Square (PLS) was used to study neural networks related to memory and self-referential processing in Alzheimer’s disease patients (AD) and two examples were presented. In the first one, we investigated the metabolic correlates of two forms of memory (conjunctive and relational memory performances) in AD. PLS identified two different brain networks highlighting correlations of the two types of memory and the glucose metabolism. In the second example, we assessed brain regions engaged during self-referential processing of information in AD patients during a task related fMRI study. PLS identified a wide brain network showing the effect of self- vs. other-referential processing. In contrast to univariate methods, PLS showed to be suitable for the study of cognitive processes. [less ▲]

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See detailCoupling of hydrogeological models with hydrogeophysical data to characterize seawater intrusion and shallow geothermal systems
Beaujean, Jean ULg; Kemna, Andreas; Engesgaard, Peter et al

Conference (2013, December 12)

While coastal aquifers are being stressed due to climate changes and excessive groundwater withdrawals require characterizing efficiently seawater intrusion (SWI) dynamics, production of geothermal energy ... [more ▼]

While coastal aquifers are being stressed due to climate changes and excessive groundwater withdrawals require characterizing efficiently seawater intrusion (SWI) dynamics, production of geothermal energy is increasingly being used to hinder global warming. To study these issues, we need both robust measuring technologies and reliable predictions based on numerical models. SWI models are currently calibrated using borehole observations. Similarly, geothermal models depend mainly on the temperature field at few locations. Electrical resistivity tomography (ERT) can be used to improve these models given its high sensitivity to TDS and temperature and its relatively high lateral resolution. Inherent geophysical limitations, such as the resolution loss, can affect the overall quality of the ERT images and also prevent the correct recovery of the desired hydrochemical property. We present an uncoupled and coupled hydrogeophysical inversion to calibrate SWI and thermohydrogeologic models using ERT. In the SWI models, we demonstrate with two synthetic benchmarks (homogeneous and heterogeneous coastal aquifers) the ability of cumulative sensitivity-filtered ERT images using surface-only data to recover the hydraulic conductivity. Filtering of ERT-derived data at depth, where resolution is poorer, and the model errors make the dispersivity more difficult to estimate. In the coupled approach, we showed that parameter estimation is significantly improved because regularization bias is replaced by forward modeling only. Our efforts are currently focusing on applying the uncoupled/coupled approaches on a real life case study using field data from the site of Almeria, SE Spain. In the thermohydrogeologic models, the most sensitive hydrologic parameters responsible for heat transport are estimated from surface ERT-derived temperatures and ERT resistance data. A real life geothermal experiment that took place on the Campus De Sterre of Ghent University, Belgium and a synthetic case are tested. They consist in a thermal injection and storage of water in a shallow sandy aquifer. The use of a physically-based constraint accounting for the difference in conductivity between the formation and the tap injected water and based on the hydrogeological model calibrated first on temperatures is necessary to improve the parameter estimation. Results suggest that time-lapse ERT data may be limited but useful information for estimating groundwater flow and transport parameters for both the convection and conduction phases. [less ▲]

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See detailNuclear Energy: Between Legitimacy and Threat
Michel, Quentin ULg

Conference (2013, December 12)

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See detailExercice physique dans les maladies neuromusculaires
WANG, François-Charles ULg

Conference (2013, December 12)

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See detailWhen does the market feel it ? Magnitude, speed and persistence of market reactions to cross-listings
Muller, Aline ULg; Biell, Elizabeth; Mouchette, Xavier ULg

Conference (2013, December 11)

Detailed reference viewed: 14 (8 ULg)
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See detailCompétences et pratiques pédagogiques innovantes
Poumay, Marianne ULg

Conference (2013, December 10)

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See detailEvaluation of the bacterial diversity and its evolution during storage of fresh beef from British and Belgian origins under different atmosphere and temperature conditions
Didimo Imazaki, Pedro Henrique ULg; Tahiri, Assia ULg; Taminiau, Bernard ULg et al

Conference (2013, December 10)

The purpose of this study was to evaluate the bacterial diversity and its evolution during storage of fresh beef, depending on its origin, packaging and storage temperature, by using a metagenomic ... [more ▼]

The purpose of this study was to evaluate the bacterial diversity and its evolution during storage of fresh beef, depending on its origin, packaging and storage temperature, by using a metagenomic approach. Metagenomic analyzes revealed that the origin, atmosphere and temperature conditions influenced the selection of the predominant flora. Vacuum-packaged British samples presented higher concentrations of Lactobacillus algidus at the begging of the experiment than Belgian samples. Furthermore, the development of Lactobacillus algidus was favored in British and Belgian samples preserved under vacuum at −1 °C, while a predominance of Lactococcus piscium was observed for samples stored at +4 °C. These microorganisms have already been isolated from beef, but taking into account that the knowledge about these two species is currently limited, it is still not possible to state if the conservability of the tested samples was influenced by the presence of these bacteria. Moreover, storage under modified atmosphere favored the development of Leuconostoc gasicomitatum in both British and Belgian samples. This specie is often associated with spoilage of cold-stored modified-atmosphere-packaged (MAP) nutrient-rich foods. This result can partially explain the short shelf-life of the samples once they are stored under this condition. Metagenomics showed to be a useful tool to study the microbial population of a complex matrix since some of the identified genera could not have grown or have grown slowly in culture media commonly used. In addition, it helped to clarify the evolution of the bacterial ecosystem associated to meat during its storage. [less ▲]

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See detailScikit-Learn: Machine Learning in the Python ecosystem
Louppe, Gilles ULg; Varoquaux, Gaël

Conference (2013, December 10)

The scikit-learn project is an increasingly popular machine learning library written in Python. It is designed to be simple and efficient, useful to both experts and non-experts, and reusable in a variety ... [more ▼]

The scikit-learn project is an increasingly popular machine learning library written in Python. It is designed to be simple and efficient, useful to both experts and non-experts, and reusable in a variety of contexts. The primary aim of the project is to provide a compendium of efficient implementations of classic, well-established machine learning algorithms. Among other things, it includes classical supervised and unsupervised learning algorithms, tools for model evaluation and selection, as well as tools for data preprocessing and feature engineering. This presentation will illustrate the use of scikit-learn as a component of the larger scientific Python environment to solve complex data analysis tasks. Examples will include end-to-end workflows based on powerful and popular algorithms in the library. Among others, we will show how to use out-of-core learning with on-the-fly feature extraction to tackle very large natural language processing tasks, how to exploit an IPython cluster for distributed cross-validation, or how to build and use random forests to explore biological data. [less ▲]

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See detailSaturn’s UV aurora: the (high latitude) point of view of Cassini
Grodent, Denis ULg; Bonfond, Bertrand ULg; Gustin, Jacques ULg et al

Conference (2013, December 09)

The high latitude vantage point of Cassini and its short distance to Saturn give rise to a unique opportunity for obtaining exceptional spectral images of the aurorae, along with in situ observations of ... [more ▼]

The high latitude vantage point of Cassini and its short distance to Saturn give rise to a unique opportunity for obtaining exceptional spectral images of the aurorae, along with in situ observations of the associated particles and magnetic field. Cassini’s T83 flyby of Titan significantly changed the inclination of the spacecraft’s orbit and marked the beginning of the XXM inclined phase 1 which will last until March 16, 2015. We will give an overview of the auroral emissions observed so far with the UVIS camera on board Cassini. In particular we will link the morphology of the aurora with specific magnetospheric processes, such as dayside reconnection and auroral bifurcations, nightside reconnection, hot plasma injections. We will also take advantage of the view from nearly above the poles to describe the overall shape and size of the aurora, which are expected to respond to the solar wind conditions. Moreover, this presentation will focus on small-scale features, which can only be observed by an instrument close enough to the planet. We will also present movies of these observations, allowing us to explore the auroral dynamics at various timescales. This information will be used to identify the various mechanisms at play in Saturn’s magnetosphere. [less ▲]

Detailed reference viewed: 10 (3 ULg)
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See detailScience and Technology as Sites of Struggle in New Political Economies: Insights from Latin American Bioeconomy
Delvenne, Pierre ULg

Conference (2013, December 09)

Increasingly, science and technology (S&T) are used as key strategic resources to address the social and economic challenges of our time (Tyfield 2012). This paper is part of my broader research program ... [more ▼]

Increasingly, science and technology (S&T) are used as key strategic resources to address the social and economic challenges of our time (Tyfield 2012). This paper is part of my broader research program, which takes S&T as sites of struggle, where (geo)political and socio-economic issues interact, and studies them in three new political economies: bioeconomy, new manufacturing economy and smart security economy. It identifies two global dynamics that are at stake in the strategic construction and use of S&T: (1) proliferating varieties of neoliberalism (Harvey 2005, Mirowski and Plehwe 2009) and (2) shifting asymmetric dependency relations (Vernengo 2006, Metcalfe and Ramlogan 2008). My main goal is to analyze and understand developments in S&T domains as co-evolving with these two key global dynamics. For this paper, I will focus on one S&T site of struggles, biotechnologies/bioeconomy in Argentina, which will allow me to look at the reconfiguring of center-periphery relations and neoliberal enactments. Based on extensive fieldwork conducted with actors from public, private and associative sectors, I explore the expansion of genetically modified soy in Argentina and I aim to figure out how the neoliberal “globalized privatization regime” (Mirowski and Sent 2008) unfolded in a peripheral location. My case points at two inherent contradictions with such a regime’s main tenets, namely that it needs a weak antitrust policy and a hyper-restrictive system of intellectual property. I conclude that it is not enough to postulate that the neoliberal globalized privatization regime will just expand to the South as it did in Northern countries. Rather, combined with the commercialization of science, peripherality creates protest, activism and local regulation. Lastly, further implications for the theorization and circulation of bioeconomy (Birch and Tyfield 2013) beyond the “charmed circle” of OECD countries (Delvenne and Thoreau 2012) will be drawn. [less ▲]

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See detailOppositions et arguments paysagers dans le projet éolien en Wallonie
Vanderheyden, Vincent ULg; Schmitz, Serge ULg

Conference (2013, December 09)

Detailed reference viewed: 19 (10 ULg)
See detailEnjeux politiques de l'ignorance : Socrate et Rancière
Herla, Anne ULg; Jeanmart, Gaëlle

Conference (2013, December 07)

Detailed reference viewed: 16 (0 ULg)
See detailPeut-on tout représenter ou les défis de la modélisation en archéologie
Van Ruymbeke, Muriel ULg

Conference (2013, December 07)

Detailed reference viewed: 24 (4 ULg)
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See detailLa dynastie belge et la science, 1909-1959
Pirot, Pascal ULg

Conference (2013, December 07)

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See detailReliability of resistivity-derived temperature: insights from laboratory measurements
Robert, Tanguy ULg; Hermans, Thomas ULg; Dumont, Gaël ULg et al

Conference (2013, December 06)

This contribution consists in studying the reliability of resistivity-derived temperature, for example from time-lapse electrical resistivity tomography (ERT) surveys. The idea of using temperature as a ... [more ▼]

This contribution consists in studying the reliability of resistivity-derived temperature, for example from time-lapse electrical resistivity tomography (ERT) surveys. The idea of using temperature as a quantitative tracer is growing in the hydrogeophysical community, especially to simulate geo/hydrothermal systems. However, plenty of physico-chemical processes are influenced by temperature and most of them impact directly resistivity measurements. Therefore, one needs to take them into account to retrieve quantitative temperature estimates from resistivity measurements but, up to now, it is seldom the case. The experiment we conducted consisted in simulating an ERT monitoring of heat storage in a sandy aquifer. We show that using experimental relationships between fluid electrical conductivity and temperature alone does not allow reliable temperature estimates, simply because rock-water interactions are neglected. Worst, from a certain temperature (45°C here), the bulk resistivity starts to increase with temperature although this is not expected from the experimental law. Chemical analyses made on water samples collected during the experiment highlight the importance of accounting chemical reactions (e.g. calcite precipitation with increasing temperature) occurring when temperature changes as well as their kinetics. Finally, other parameters as surface conductivity cannot always be neglected when estimating temperature from resistivity measurements. This means that retrieving reliable temperatures from bulk resistivity measurements (e.g. time-lapse ERT) requires the knowledge of water mineralization as well as the rock / soil mineralogy in order to fully integrate physico-chemical reactions between groundwater and the host rock, for example with a joint inversion scheme. [less ▲]

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See detailL'interface 1ère-2ème ligne de soins
Belche, Jean-Luc ULg

Conference (2013, December 06)

L’implication des MG dans le suivi de patients insuffisants cardiaques sévères est importante. Le « chronic car model » a démontré son efficacité dans le suivi d’une maladie chronique. L’opérationnalité ... [more ▼]

L’implication des MG dans le suivi de patients insuffisants cardiaques sévères est importante. Le « chronic car model » a démontré son efficacité dans le suivi d’une maladie chronique. L’opérationnalité de la prise en charge intégrée sur le terrain devrait respecter les particularités locales et/ou les réseaux existants. Le MG n’est pas le seul intervenant actuel de la première ligne de soins ; il travaille le plus souvent en réseau, quand celui-ci n’est pas structuré en centre de santé intégré. Ce modèle, promotionné par l’OMS, repose sur un travail en équipe pluridisciplinaire, dans un souci de continuité relationnelle et informationelle. (Les réseaux multidisciplinaires locaux (RML) ont été créés à cette fin dans le cadre des trajets de soins.) L’adjonction d’intervenant spécialisé dans le suivi de l’insuffisance cardiaque porte en elle le germe de la muliplication des intervenants et de la fragmentation des soins. Cela risque de provoquer un rejet par la première ligne de soins, au moment où on l’appelle à se structurer en réseau d’intervenants, à vocation transversale ou générale. Or la situation la plus prévalente est la multimorbidité, l’insuffisance cardiaque au milieu d’autres maladies ou conditions chroniques. Il est démontré que la multiplication des approches centrées sur la maladie a un impact négatif sur l’efficacité des soins, sur la qualité des soins, et à un coût plus élevé. L’approche centrée sur la maladie, prédominante actuellement, doit glisser lentement mais surement vers une approche centrée sur le patient, et ses propres objectifs. [less ▲]

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See detailMonitoring temperature changes during heat tracing experiments using electrical resistivity tomography
Hermans, Thomas ULg; Wildemeersch, Samuel ULg; Nguyen, Frédéric ULg

Conference (2013, December 06)

Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has ... [more ▼]

Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has proven its ability to monitor salt tracer tests, but few studies have investigated its performances, both qualitatively and quantitatively, in thermal tracing experiments. In this study, we monitored a heat injection and pumping experiment in an alluvial aquifer using both surface and crosshole ERT. The data sets of the surface profile, located along the main direction of flow, are distorted during injection by an electrical short-circuit through the external pumping-heating-injection experimental set-up. Current is flowing outside the subsurface leading to bad data for electrode dipoles located near the pumping and injection wells. The crosshole ERT panel is perpendicular to the main direction of flow. Difference inversion time-lapse images clearly show a preferential flow path in the bottom of the aquifer related to the presence of a coarse and clean gravel layer. Direct temperature measurements are available in control piezometers during the experiment to validate the ERT-derived temperatures and confirm the spatial pattern of temperature observed with ERT. Breakthrough curves are correctly retrieved in time and difference of 10 to 20% are observed for temperature estimation. The latter requires site-specific petrophysical laws and chemical stability assumptions that must be carefully verified. Our study proves that ERT, especially crosshole ERT, is a reliable tool to follow thermal tracing experiments but also to characterize heat transfer in the subsurface and to monitor geothermal resource exploitations. We also show that surface ERT may be impacted by the survey layout in unsuspected ways. [less ▲]

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See detailOdour emissions impact of on-farm biogas production with co-digestion : a case study in four European farms of the Great Region
Adam, Gilles ULg; Gennen, Jérome; Ubeda Sanchez, Yolanda et al

Conference (2013, December 06)

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See detailEtat des lieux et perspectives de la foresterie communautaire au Gabon
Meunier, Quentin; Boldrini, Sylvie; Vermeulen, Cédric ULg

Conference (2013, December 06)

Detailed reference viewed: 28 (1 ULg)
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See detailCapture of 3D sound with a spherical microphone array
Feron, Hermine; Embrechts, Jean-Jacques ULg

Conference (2013, December 05)

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See detailMinimum gradient support and geostatistics regularization approaches for inverting time-lapse data
Nguyen, Frédéric ULg; Hermans, Thomas ULg; Robert, Tanguy ULg

Conference (2013, December 05)

Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, site remediation or tracer tests. Based on these ... [more ▼]

Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, site remediation or tracer tests. Based on these snapshots, one can infer qualitative information on the location and morphology of changes occurring in the subsurface but also quantitative estimates on the degree of changes in certain property such as temperature or total dissolved solid content. Analysis of these changes can provide direct insight into flow and transport processes and controlling parameters. However, the reliability of the analysis is dependent on survey geometry, measurement schemes, data error, or regularization. Except regularization, survey design parameters may be optimized prior to the monitoring survey. Regularization, on the other hand, may be chosen depending on available information collected during the monitoring. Common approaches consider smoothing model changes both in space and/or time. We here propose to use two alternative regularization approaches which may be better suited to invert time-lapse data. The first approach is the minimum gradient support (MGS) regularization, which focus the changes in tomograms snapshots. MGS will limit the occurrences of changes in electrical resistivity but will also restrict the variations of these changes inside the different zones. The second approach is based on geostatistics and requires first to derive variogram parameters for the model changes. In this contribution, we demonstrate the benefits and limitations of these regularization approaches to time-lapse data on numerical benchmarks and three case studies. [less ▲]

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See detailFriction Stir Processing of Magnesium Matrix Composites Reinforced with Carbon Fibres or Carbon Nanotubes - A Comparative Study
Mertens, Anne ULg; Simar, Aude; Garray, Didier et al

Conference (2013, December 05)

The poor wettability of carbon substrates by liquid Mg and, in the case of carbon nanotubes (CNTs), their strong tendency to agglomerate, are major obstacles to the large-scale production of C-Mg ... [more ▼]

The poor wettability of carbon substrates by liquid Mg and, in the case of carbon nanotubes (CNTs), their strong tendency to agglomerate, are major obstacles to the large-scale production of C-Mg composites by classical ‘liquid-state’ processing routes such as squeeze casting. As an innovative ‘solid state’ process, Friction Stir Processing (FSP) hence appeared as a very promising alternative for the production of C-Mg composites, although the method for inserting the reinforcing phase - in grooves or holes machined in the matrix material - remained time-consuming and labour-intensive. More recently, the present authors proposed a new and easier technique for the insertion of C fibres in FSPed Mg-matrix composites i.e. FSP of a C fabric stacked between two metal sheets. In the current work, the feasibility of extending this latter method to the production of CNTs-Mg composites has been assessed. “Bucky papers” – thin disks made from agglomerated CNTs, thus ensuring for their safe handling – were stacked between two sheets of Mg alloy AZ31B, and the resulting sandwich was FSPed. The effect of FSP experimental parameters such as the rotational and advancing speeds or the number of passes on the microstructural changes occuring upon processing has been studied and compared with the case of C fibres-Mg composites. Moreover, a particular attention has been given to the distribution of the reinforcements in the Mg matrix and to the characterization of the resulting mechanical properties. [less ▲]

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See detailSources, transport et transformation du carbone, de l’azote et du phosphore dans le fleuve Niger : résultats après 2 années d’observations à Niamey
Alhou, Bassirou; Darchambeau, François ULg; Bouillon, Steven et al

Conference (2013, December 05)

Le fleuve Niger est le troisième plus important fleuve d'Afrique et draine une superficie d'environ 2 120 000 km². Il englobe six régions hydrographiques caractéristiques des écosystèmes de l’Afrique ... [more ▼]

Le fleuve Niger est le troisième plus important fleuve d'Afrique et draine une superficie d'environ 2 120 000 km². Il englobe six régions hydrographiques caractéristiques des écosystèmes de l’Afrique occidentale. Nonobstant l’importance de ce fleuve à l’échelle régionale et continentale, peu de données ont été récemment collectées sur la biogéochimie du fleuve et en particulier sur son rôle dans le transport et la transformation de la matière, dont le carbone, l’azote et le phosphore. La présente communication traite des résultats d’un suivi sur deux années, d’avril 2011 à mars 2013 dans le Niger moyen, en amont de la ville de Niamey (Niger) [2.01° E, 13.57° N], selon une fréquence d’observation bihebdomadaire. Les variables mesurées sont la température, la conductivité, l’oxygène dissous, le pH, la matière en suspension (MES), l’alcalinité totale (TA), les différentes formes du carbone (C), de l’azote (N) et du phosphore (P) inorganiques dissous, le C, l’N et le P organiques particulaires, ainsi que la composition isotopique de ces éléments. Une attention particulière est portée aux concentrations des gaz à effet de serre (GES) que sont le dioxyde de carbone (CO2), le méthane (CH4) et l’hémioxide d’azote (N2O). Les débits journaliers du fleuve proviennent de la station de mesure hydrologique de l’autorité du Bassin du Niger (ABN) à Niamey. Les flux annuels ont été calculés par la méthode de Beale pour les régimes stratifiés (Gumleaf v0.1) à partir des débits quotidiens et des concentrations observées. La situation hydrologique a été fort contrastée entre les 2 années d’étude puisque le débit moyen sur la première année était de seulement 674 m3 s-1, soit un des débits les plus faibles enregistrés sur le fleuve à Niamey depuis 1940, et de 1096 m3 s-1, soit une valeur médiane, lors de la deuxième année. Nos résultats montrent que la MES, le carbone organique particulaire, le carbone organique dissous et le carbone inorganique dissous sont principalement transportés lors de la crue locale, engendrée par les précipitations de la mousson en juillet-août. La seconde crue, ou crue guinéenne, qui a lieu de novembre à janvier, est caractérisée par une chute des températures et des eaux claires. Les flux annuels des différentes espèces transportées étaient en relation directe avec les différences de régime hydrologique. [less ▲]

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See detailTandem MS of -new- antibiotics from Bacillus guided by MALDI Mass Spectrometry Imaging
Debois, Delphine ULg; Jourdan, Emmanuel; Cawoy, Hélène ULg et al

Conference (2013, December 05)

Generally, an antibiotic is thought to have a role in antagonism simply because the producing strain is known to exhibit a potential for pathogen growth inhibition. Some genetic approaches such as PCR ... [more ▼]

Generally, an antibiotic is thought to have a role in antagonism simply because the producing strain is known to exhibit a potential for pathogen growth inhibition. Some genetic approaches such as PCR using specific primers or genome mining using known sequence data of close relatives are also used. Nevertheless, none of these methods allows stating for a link between a specific compound and the observed antagonism. Yet MALDI Mass Spectrometry Imaging (MSI) is a powerful tool to decipher the chemical messengers exchanged by two protagonists [1,2,3;]. Tandem mass spectrometry (MS/MS) may be also used, either on extracts [2,3] or directly on the microbial colonies [4]. The presentation will thus be focused on two examples of application of MALDI MSI combined to in situ tandem mass spectrometry. The first presented case will be the antagonism between soilborne strain Paenibacillus polymyxa Pp56 and the fungal phytopathogen Fusarium oxysporum. Using MALDI MSI, we were able to precisely localize each detected antibiotic, allowing discriminating which LI-F lipopeptides (fusaricidin) were really active against the pathogen progression. Besides, the use of in situ MS/MS allowed us to sequence the peptide moiety of several LI-F lipopeptides, showing that some of them are actually a mixture of several forms. The second example concerns the metabolites that are released by Bacillus amyloliquefaciens S499 cells following their inoculation on 7 days old tomato roots. We developed specific bioassays for time-course monitoring by MALDI MSI. First analyses revealed an efficient secretion of surfactin by Bacillus cells after 3 days when colonization as biofilm-structured populations is well established. Even if the composition of antibiotic mixture does not greatly evolve over time, after long incubation periods (32 or 35 days post inoculation), new series of compounds are detected in the tomato root -surrounding medium. Structural analysis based on exact mass measurements and MS/MS experiments, performed directly on the semi-solid agar medium, allowed us to identify these compounds as new variants of surfactins. [1] Barger, S., et al., Anton Leeuw Int J G, 2012, 102, 435-445. [2] Hoefler, B. C., et al,. Natl Acad Sci USA, 2012, 109, 13082-13087. [3] Moree, W. J., et al., Natl Acad Sci USA, 2012, 109, 13811-13816. [4] Debois, D., et al., J Am Soc Mass Spectrom. 2013, 24, 1202-1213 [less ▲]

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See detailL'Europe face à la crise : quelle est encore la place des contribuables ?
Richelle, Isabelle ULg

Conference (2013, December 05)

Si, depuis de nombreuses années, l’Europe fiscale politique était en panne, alors qu’une harmonisation fiscale « indirecte » intervenait par l’intervention des Juges européens, on constate aujourd’hui un ... [more ▼]

Si, depuis de nombreuses années, l’Europe fiscale politique était en panne, alors qu’une harmonisation fiscale « indirecte » intervenait par l’intervention des Juges européens, on constate aujourd’hui un mouvement inverse, avec un regain des initiatives politiques. Celles-ci peuvent apparaître comme protectrices des intérêts nationaux (lutte contre la fraude et l’évasion fiscales, lutte contre les planifications fiscales agressives, assistance au recouvrement des dettes fiscales, échange de renseignements, etc.), et peuvent être mises en relations avec certaines décisions récentes de la Cour de justice : assiste-t-on à un mouvement protecteur des intérêts étatiques, au détriment des droits des contribuables ? Les stratégies envisagées constituent-elles une réponse adéquate aux défis actuels ? [less ▲]

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See detailPotentiel d'utilisation de la spectrometrie moyen infrarouge pour prédire le rendement fromager du lait et étudier sa variabilité génétique
Colinet, Frédéric ULg; Troch, Thibault ULg; Abbas, O. et al

Conference (2013, December 04)

Providing a quick, reliable and cheap indication of the expected cheese yield for a milk sample by avoiding (empirical or theoretical) formulas based on previously determined milk constituents would be an ... [more ▼]

Providing a quick, reliable and cheap indication of the expected cheese yield for a milk sample by avoiding (empirical or theoretical) formulas based on previously determined milk constituents would be an economically valuable tool useful for farmers and the dairy industry. In order to study the genetic variability of cheese yield on a large scale, mid-infrared (MIR) chemometric methods were used to predict fresh or dry Individual Laboratory Cheese Yield (RdFF and RdFS, respectively). RdFF and RdFS were determined on a total of 258 milks samples also analyzed by a MIR spectrometer. Equations to predict RdFF and RdFS from milk MIR spectra were developed using partial least square regression (PLS) after first derivative pre-traitment applied to the spectra. The cross-validation coefficients of determination (R²cv) of the two equations were equal to 0.81 for the prediction of RdFF and 0.82 for the prediction RdFS. The ratios of performance to deviation (RPD) of the two equations were both equal to 2.3. Therefore, these results suggest a practical utility of these two equations, i.e. for genetic research. Both equations were applied on the spectral database generated during the Walloon routine milk recording. The variances components were estimated using univariate random regressions animal test-day model. The dataset included 51 537 predicted records from 7 870 Holstein first-parity cows. Estimated daily heritabilities ranged from 0.31 (at 5th day in milk (DIM)) to 0.59 (at 279th DIM) for RdFF and from 0.31 (at 5th DIM) to 0.57 (at 299th DIM) for RdFS. Those moderate to high daily heritabilities indicated potential of selection for both traits. [less ▲]

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See detailLa légende d'Isis et de Rê conservée sur le P. Turin 1993
Sojic, Nathalie ULg

Conference (2013, December 04)

The Story of Isis and Ra is a text famous in the world of Egyptology, since its publication by Pleyte and Rossi in the Catalogue des papyrus de Turin at the end of the nineteenth century. Although it has ... [more ▼]

The Story of Isis and Ra is a text famous in the world of Egyptology, since its publication by Pleyte and Rossi in the Catalogue des papyrus de Turin at the end of the nineteenth century. Although it has been translated many times, this text has however never received a full philological treatment and several problems remain hitherto unsolved. In my paper I will first present P. Turin 1993, its text and the parallel sources. I well then contextualise the text within the broader frame of Egyptian magic during the New Kingdom. The second part of my paper will be devoted to an analysis of the document, of its text and of the sources, stressing the contribution of such a study to the general issue of text composition, conservation and transmission in ancient Egypt. [less ▲]

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