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See detailEnjeux autour des forêts congolaises
Vermeulen, Cédric ULg

Conference (2013, April 19)

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See detailEcological wood anatomy of 155 African tropical hardwoods
Beeckman, Hans; Fayolle, Adeline ULg; Doucet, Jean-Louis ULg et al

Conference (2013, April 19)

In this study we aimed at identifying the anatomical characters expressing life history traits of woody species from the northern Congo Basin. We crosschecked three databases: the botanical inventories ... [more ▼]

In this study we aimed at identifying the anatomical characters expressing life history traits of woody species from the northern Congo Basin. We crosschecked three databases: the botanical inventories produced during the CoForChange project (857 spp.), the database of life history traits established by the CIRAD (France) and GxABT (Belgium) (464 spp.), and the anatomical database Inside Wood (761 spp. and genera for tropical Africa). A total of 155 shared species was obtained. We performed correspondence analyses between the anatomical characters and two main groups of traits: leaf phenology and light-requirement. Results showed: (i) that wood anatomy is involved in leaf phenology and light-requirement in a significant way (7.56% of the variance on axe1), (ii) that evergreenness was correlated to IAWA characters 14 to 18 (scalariform perforation plates, e.g. Olacaceae) and deciduousness to characters 118 to 122 (storied structures, e.g. Malvaceae and Meliaceae), (iii) that pioneer (P) and non-pioneer light-demanding (NPLD) species showed similar traits but were different from shade-tolerant (ST) species, (iv) that deciduous and evergreen species showed separate distributions, and (v) that wood anatomy validated the well documented strong correlation between evergreen species and ST species, with an inversion of the tendency for deciduous species correlated to P and NPLD species. We conclude that anatomical characters can be used as indicators of life history traits in species-rich biomes. Further investigations are needed to increase the input of wood anatomy in explaining the life history traits in African tropical species. [less ▲]

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See detailParticle-accelerating colliding-wind binaries: from the study of a few objects to a science case study
De Becker, Michaël ULg

Conference (2013, April 18)

The study of massive stars, and in particular of colliding-wind binaries, revealed the capability of some of them to accelerate particles up to relativistic energies. Since the 1980's, what appeared at ... [more ▼]

The study of massive stars, and in particular of colliding-wind binaries, revealed the capability of some of them to accelerate particles up to relativistic energies. Since the 1980's, what appeared at first sight to be an anomaly in their observational properties turns out to be the signature of important physical processes at work in a large number of objects. In this contribution, I summarize the current census of information relevant to the catalogue of Particle-Accelerating Colliding-Wind Binaries (PACWBs) that constitute a particular class of objects likely to contribute to the production of low energy Galactic cosmic-rays. On the basis of this census of information, some prospects for future observational strategies are discussed. [less ▲]

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See detailProtocol ALERT : Congress European Emergency Number Association
Stipulante, Samuel ULg

Conference (2013, April 18)

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See detailNew perspectives in the study of impiety: escaping from the letter of the law
Delli Pizzi, Aurian ULg

Conference (2013, April 17)

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See detailÀ propos des "sciences camérales" chez Stengers
Thoreau, François ULg

Conference (2013, April 16)

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See detailInterpretation of Annex I : comprehensive or indicative
Michel, Quentin ULg

Conference (2013, April 16)

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See detailQuel sort pour les déchets moyennement et hautement radioactifs belges ? Controverse sur le choix de l’option.
Parotte, Céline ULg; Lits, Grégoire

Conference (2013, April 15)

Pour saisir les ressorts de la problématique de la gestion des déchets moyennent et hautement radioactifs et/ou de longue durée de vie (déchets de catégorie B&C), cet article met en évidence, dans un ... [more ▼]

Pour saisir les ressorts de la problématique de la gestion des déchets moyennent et hautement radioactifs et/ou de longue durée de vie (déchets de catégorie B&C), cet article met en évidence, dans un premier temps, la transformation du mode de prise de décision entourant la gestion des déchets nucléaires belges. Le passage d’un mode de décision technocratique à un mode davantage participatif révèle la présence de nouveaux acteurs dans le jeu décisionnel légal avec notamment, l’obligation de s’intéresser à l’acceptabilité sociale du projet de gestion. Dans ce contexte, les chercheurs interrogent également le rôle des médias dans cette mise en politique et plus précisément le cadrage que les journalistes apportent à la problématique. Aussi, les cadrages différemment posés par le journaliste francophone et le journaliste néerlandophone du plan de gestion des déchets B&C (appelé Plan Déchets) impliquent une mobilisation d’acteurs différents et une mise en débat de la problématique différente. Au-delà des enjeux propres à chaque acteur, nous verrons également, à l’identique de Barthe (2010), que les différentes options technologiques (autrement dit, les réponses proposées pour gérer les déchets) suggèrent des traitements de l’incertitude en tous points opposés et engagent des temporalités décisionnelles très différentes. Ces acteurs de la scène médiatique belge sont-ils ceux qui sont nouvellement intégrés dans la mise en politique? Les débats sont-ils identiques? Quel est le rôle des journalistes dans le processus décisionnel ? [less ▲]

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See detailIntroducing dynamic benthic fluxes in 3D biogeochemical model : an application on the Black Sea North-Western shelf
Capet, Arthur ULg; Meysman, Filip; Soetaert, Karline et al

Conference (2013, April 15)

While benthic and sediment processes are now recognized as major components of the shelf iogeochemical budget, their representation in 3D biogeochemical model has for long been oversimplified [Soetaert et ... [more ▼]

While benthic and sediment processes are now recognized as major components of the shelf iogeochemical budget, their representation in 3D biogeochemical model has for long been oversimplified [Soetaert et al., 2000]. These oversimplified formulations of the bottom boundary onditions prevent to account for the response of diagenetic processes to the environment. The onsequent absence of spatial and temporal variability of benthic/pelagic fluxes may lead to mis- valuation of important terms in the biogeochemical budgets (e.g. Oxygen, Nitrogen, Carbon, hosphate). More importantly, feedbacks mechanisms within the ecosystem response to utrophication may be overlooked, such as, for instance, the sensitivity of benthic denitrification o the oxygen content in the bottom waters. The GHER-ECO 3D biogeochemical model is xtended ith a refined benthic component explicitly accounting for the effect of organic matter transport, eposition and resuspension and for the influence of the environmental conditions on the iagenetic pathways. A semi-empirical approach allows to reproduce the variability and feedbacks riven by benthic diagenesis without the computational burden of a vertically resolved sediment ayer. This simplification allows to use the coupled model for the long term runs (several ecades) required to appreciate the slow dynamics introduced by the accumulation of organic atter in the sediment layer during the years of high riverine discharge. The extended model has een implemented for the Black Sea North western shelf [Capet et al., 2012]. After a presentation f the main assumptions used to construct the benthic module, re- sults are analyzed with a focus n (1) spatial and seasonal variability of benthic diagenesis and con- sequent benthic/pelagic xchanges, (2) comparison to in-situ estimates of benthic/pelagic dissolved fluxes, (3) implication n biogeochemical budgets and eutrophication issue. Inherent limitations of the semi-empirical pproach are discussed in the perspective of the current challenges addressed to biogeochemical odels. [less ▲]

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See detailA comparison of soil properties under four vegetation units from six metalliferous hills in Katanga
Kaya Muyumba, Donato ULg; Mahy, Grégory ULg; Ngongo Luhembwe, Michel et al

Conference (2013, April 12)

In Katanga (Democratic Republic of Congo), numerous metalliferous hills are distributed along what is called the copperhill belt from Kolwezi to Lubumbashi. Very specific vegetation developed on these ... [more ▼]

In Katanga (Democratic Republic of Congo), numerous metalliferous hills are distributed along what is called the copperhill belt from Kolwezi to Lubumbashi. Very specific vegetation developed on these hills within the miombo forest in response to very specific soil conditions, among which the copper content. Previous studies have already shown the existence of gradients of copper from the mineralized rocks outcropping at the top of the hills to the foot slopes on colluviums. After a characterization of the vertical variability of soil properties in pits distributed along the main slopes, we investigated the soil-vegetation relationships in six hills located between the towns of Tenke and Fungurume. Observation 1-square meter plots were installed in four vegetation units and sixty of them were selected according to their relative importance on the six hills. The soil from the top 10cm was sampled and analyzed for pH, Total Organic Carbon, available P, K, Mg, Ca, Cu, Co and Mn and soluble Cu and Co. Analysis of variance was performed in order to assess whether the effects of the “Hill” and of the “Vegetation Unit” were significant to explain soil chemical variability. Additionally, short transects were sampled at the boundaries from adjacent vegetation units in order to evaluate the gradual or rough nature of change in soil properties under these units. [less ▲]

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See detailPhoton correlation spectroscopy for molecular self-assembly investigations
Razafindralambo, Hary ULg

Conference (2013, April 11)

The molecular self-assembly performance is among the most important functionalities of amphiphilic compounds in colloidal system areas. This aptitude is required in numerous applications, depending on ... [more ▼]

The molecular self-assembly performance is among the most important functionalities of amphiphilic compounds in colloidal system areas. This aptitude is required in numerous applications, depending on solubilization, hydrotropy, rheology, separation, loading and delivery, encountered in biological and industrial processes. The main physicochemical parameter predicting the capacity of amphiphiles to self-assembly in bulk liquid, aqueous (normal micelles) or non-aqueous phase (reverse micelles), is the pair critical micelle concentration (CMC) and temperature (CMT). A variety of methods based on surface tension, spectral changes, and electrical conductivity are commonly used for determining the value of CMC. The choice usually depends on the ionic or non-ionic nature of the amphiphilic compounds. In this communication, a standard Photon Correlation Spectroscopy (PCS), also known Light Scattering-based technique for CMC determination will be theoretically and practically described in details. Its particular interest for measuring the performance of non-ionic and very high hydrophobic tail, mono or disubstituted carbohydrate-based compounds, from C16 alkyl chain, will be demonstrated. Such a method is advantageous regarding the time, amount, and resolution required, but also for additional information on micelle size, aggregate number, and stability it may provide, compared to surface tension and electrical conductivity-based measurements. [less ▲]

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See detailFundamental property and functional aptitude relationships in emulsion and foam applications of amphiphilic compounds
Razafindralambo, Hary ULg

Conference (2013, April 11)

Amphiphilic compounds are issued of a combination of two opposite entities, covalently assemblied within a single structure. By the diversity of the origin, class, number of monomer and substitute, size ... [more ▼]

Amphiphilic compounds are issued of a combination of two opposite entities, covalently assemblied within a single structure. By the diversity of the origin, class, number of monomer and substitute, size, linker or spacer, stereochemistry of the molecular entities, their chemical structure may be very different but also close each other. However, they may fulfill the same role in reducing surface and interfacial free energy in dynamic or static ways, ensuring especially the formation of dispersed systems like emulsion and foam. If the relationships between the structural variable and fundamental properties are strictly chemical residue dependent, those between fundamental and functional aptitudes are not necessarily. In this case, general and universal rules may exist, whatever the kind of amphiphilic compounds. In order to achieve a rational design for any expected functionality, we attempt to find out some predictive and conception rules from a lot of screening data of fundamental and functional properties. In this communication, some correlations between fundamental data related to surface and interfacial properties, measured by molecule adsorption or spreading under dynamic or static mode, in compression or dilation of adsorbed or spread film, and emulsifying and foaming performances of various bio-based surfactants will be presented. [less ▲]

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See detailChanges of soil structure and earthworm community under different agricultural management
Lemtiri, Aboulkacem ULg; Alabi, Taofic; Francis, Frédéric ULg et al

Conference (2013, April 11)

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See detailChanges of soil structure and earthworm community under different agricultural management
Lemtiri, Aboulkacem ULg

Conference (2013, April 11)

The living soil is represented by soil biota that interacts with aboveground biota and with the abiotic constructs of soil, represented as soil structure, organic matter, and nutrients. Maintenance of ... [more ▼]

The living soil is represented by soil biota that interacts with aboveground biota and with the abiotic constructs of soil, represented as soil structure, organic matter, and nutrients. Maintenance of soil organic matter through integrated soil fertility management is necessary for soil quality and agricultural productivity. Earthworms are key actors in soil structure formation through the formation of casts and the incorporation of soil organic matter in the soil. Little is known about the interactive effects of various tillage and crop residue management practices on earthworm populations and physical properties of soil. To investigate the impacts of two tillage management systems and two cropping systems on earthworms populations and soil stucture dynamics, we carried out a three years study of the earthworm communities in experimental site having for experimental treatments : two tillage management systems and two cropping systems. In consequence, the aims of this experimentation were to determine the effects of the tillage systems on the abundance, biomass and diversity of earthworms and examine temporal variation of soil structure and dynamics of nutrient elements. The first results reveal that tillage management had a significant affect on earthworm abundance and biomass. However, crop residue management did not affect abundance, biomass and diversity of earthworms. The analyze of nutrient element dynamics showed that some nutrient elements (phosphore,…) decrease with tillage practice. This study has shown that soil structure was variable within the fields and between them, although the successive cultivation operations and the equipement used for wheat cropping were identical in the study site. [less ▲]

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See detailEstimation of the Greenland ice sheet surface mass balance contribution to future sea level rise using the regional climate model MAR
Fettweis, Xavier ULg; Gallée, H.; van den Broeke, M. et al

Conference (2013, April 10)

With the aim of estimating the sea level rise (SLR) coming from Surface Mass Balance (SMB) changes over the Greenland ice sheet (GrIS), we report future projections obtained with the regional climate ... [more ▼]

With the aim of estimating the sea level rise (SLR) coming from Surface Mass Balance (SMB) changes over the Greenland ice sheet (GrIS), we report future projections obtained with the regional climate model MAR, forced by outputs of three CMIP5 General Circulation Models (GCMs). Our results indicate that in warmer climates, the mass gained due to increased winter snowfall over GrIS does not compensate the mass lost through increased meltwater run-off in summer. All the MAR projections shows similar non-linear melt increases with rising temperatures as a result of the positive surface albedo feedback, because no change is projected in the general atmospheric circulation over Greenland. Nevertheless, MAR exhibits a large range in its future projections. By coarsely estimating the GrIS SMB changes from CMIP5 GCMs outputs, we show that the uncertainty coming from the GCM-based forcing represents about half of projected SMB changes. In 2100, the CMIP5 ensemble mean projects a SLR, resulting from a GrIS SMB decrease, estimated to be 4 2 cm and 9 4 cm for the RCP 4.5 and RCP 8.5 scenarios, respectively. However, these future projections do not consider the positive melt-elevation feedback. Sensitivity MAR experiments using perturbed ice sheet topographies consistent with the projected SMB changes highlight the importance of coupling climate models to an ice sheet model. Such a coupling will allow to consider the future response of both surface processes and ice-dynamic changes, and their mutual feedbacks to rising temperatures. [less ▲]

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See detailNanocarriers tailored for the delivery of proteinaceous drugs
Grandfils, Christian ULg

Conference (2013, April 09)

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See detailOptimisation of degradable microcarriers for tissue engineering
Lombart, François ULg; Sevrin, Chantal ULg; Flebus, Luca ULg et al

Conference (2013, April 09)

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See detailPolyphosphate-based copolymers for drug delivery applications
Lecomte, Philippe ULg

Conference (2013, April 09)

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See detailModélisation du transfert radiatif en forêts feuillues ardennaises : adaptation de la librairie Samsaralight
Ligot, Gauthier ULg; Jonard, Mathieu; de Coligny, François et al

Conference (2013, April 08)

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See detailThe role of C and N dopants incorporation in phase change materials
Noé, Pierre; Raty, Jean-Yves ULg; Ghezzi, Giada et al

Conference (2013, April 05)

Phase change memory (PCM) technology is considered to be among the most promising alternatives to conventional technologies in embedded memories [1]. To allow operation at relatively high temperatures in ... [more ▼]

Phase change memory (PCM) technology is considered to be among the most promising alternatives to conventional technologies in embedded memories [1]. To allow operation at relatively high temperatures in embedded applications, it is crucial to improve the stability of the amorphous phase. Carbon and nitrogen doping have been shown to significantly increase the crystallization temperature [1-3]. Moreover, the high RESET current requirement [2], which is a limit to the scalability of GeTe and GST, can be reduced by the incorporation of a dopant element [4]. In this presentation we focus on correlating experimental results and ab initio simulations to understand the effect of C and N incorporation in GeTe and GST PCM devices. Understanding the effect of dopants on the change of electronic properties and the mechanisms of the phase transformation requires analysis of the local order and structure of the amorphous to crystalline phases. In this context, we demonstrate that carbon and nitrogen deeply affects the structure and the dynamical properties of the amorphous phase of GeTe. In particular, the inclusion of N and C dopant elements in GeTe has a drastic effect on the vibrational modes of GeTe therefore improving the stability of the glass. This effect goes with an increased mechanical rigidity explaining why these doped GeTe compounds have a higher crystallization temperature than the undoped ones. Finally we will explore, mainly by FTIR and XRD measurements, the effect of C and N dopants during the annealing of amorphous PCMaterials towards their crystalline phases. These results will be discussed in order to understand the origin of the differences of the doped PCMaterials amorphous phase stability (data retention) observed between full sheet materials and the materials integrated in PCM devices. [1] A. Fantini et al., 2010 IEEE International Electron Devices Meeting (IEDM), 2010, pp. 29.21.21-29.21.24. [2] G. Betti Beneventi et al., Solid-State Electronics, 65-66 (2011) 197-204. [3] V. Sousa et al., EPCOS 2011. [4] Q. Hubert et al., IMW 2012. [less ▲]

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See detailJesuit solemnities in the Southern Netherlands: immersion and experience
Delfosse, Annick ULg

Conference (2013, April 05)

Since the celebrations for Ignatius’s beatification organized in Brussels in 1609, the Belgian Jesuits kept proposing processional performances characterized not only by their highly spectacular features ... [more ▼]

Since the celebrations for Ignatius’s beatification organized in Brussels in 1609, the Belgian Jesuits kept proposing processional performances characterized not only by their highly spectacular features, but also by their physical dimensions, in contempt of synodal summons that imposed a strong spiritualization of the processions. With Jesuit ceremonies, bodies are in movement, senses are awakened, and emotions are heightened. Processions establish themselves as immersional spatio-temporal frames where what matters the most seems to be the experience provoked by the saturation of special effects. I will seek to define the practical terms of this experience and to identify the devices used to make this experience possible and the purpose behind this activation of experience. [less ▲]

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See detailDielectric and rheological characterization of polymer/graphene oxide nano composites
Thomassin, Jean-Michel ULg; Trifkovic, Milana; Jérôme, Christine ULg et al

Conference (2013, April 05)

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See detailGestion à long terme des déchets nucléaires belges moyennement et hautement radioactifs: Construire un dispositif communicationnel mais comment?
Parotte, Céline ULg

Conference (2013, April 04)

Aujourd’hui, personne ne remet plus en cause l’intégration d’une approche participative dans le processus de gestion des déchets moyennement et hautement radioactifs belges (de catégorie B&C). Cette ... [more ▼]

Aujourd’hui, personne ne remet plus en cause l’intégration d’une approche participative dans le processus de gestion des déchets moyennement et hautement radioactifs belges (de catégorie B&C). Cette dimension apparaît indispensable compte tenu, d’une part, du consensus international et européen en la matière, et d’autre part, des écueils qu’a déjà connu le programme belge de gestion des déchets faiblement radioactifs. Ce constat d’une nécessaire intégration de la dimension sociétale dans la problématique a nécessité la mobilisation d’un nouveau champ d’expertise dans le champ des déchets radioactifs : celui des sciences sociales. <br />Mais comment le chercheur en sciences sociales a-t-il été mobilisé ? Cette communication propose de retracer l’évolution de l’engagement du chercheur en sciences sociales depuis le lancement des activités participatives mises en place lors de l’élaboration du programme de gestion jusqu’à aujourd’hui. D’une situation initiale qui attribuait un rôle prédéfini au chercheur, celui d’évaluateur externe réagissant à la demande du commanditaire public, on est passé à une relation plus étroite, mais aussi plus ambivalente, de co-construction de connaissance entre le chercheur et l’ONDRAF, devenu à la fois sujet et objet d’étude. Pour analyser ce changement de configuration, l’auteure adopte une démarche principalement inductive et pragmatique en partant de ses expériences empiriques menées au sein de l’organisme de gestion des déchets radioactifs. <br />L’auteure s’inscrit dans le cadre d’analyse proposé par Laurent and Van Oudheusden (2013 à paraitre) pour rendre compte du rôle du chercheur dans le cadre des nanotechnologies. L’évolution de la situation de chercheure en sciences sociales décrite ici sera ainsi déclinée sur les trois dimensions mises en évidence par les auteurs: la relation du chercheur en sciences sociales aux acteurs qu’il étudie ; la pertinence politique de son travail ; enfin, les problèmes auxquels le chercheur doit faire face. [less ▲]

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See detailProbability perturbation method applied to the inversion of groundwater flow models using HydroGeoSphere
Hermans, Thomas ULg; Scheidt, Céline; Caers, Jef et al

Conference (2013, April 04)

Solving spatial inverse problems in Earth Sciences remains a big challenge given the high number of parameters to invert for and the complexity of non-linear forward models. Techniques were developed to ... [more ▼]

Solving spatial inverse problems in Earth Sciences remains a big challenge given the high number of parameters to invert for and the complexity of non-linear forward models. Techniques were developed to reduce the number of parameters to invert for or to produce geologically consistent simulations from an initial guess. These techniques ask for a prior model to constrain the spatial distribution of the solution. Geostatistical models contain, by nature, information to control the spatial features of the inverse solutions, but the integration of dynamic data into such models remains difficult. We adapted, the “probability perturbation algorithm” (PPM) using Matlab® to invert hydrogeological data using multiple-point geostatistics to build models of pre-defined hydrofacies. The algorithm uses HydroGeoSphere (HGS) to compute the forward response of the model and SGems to produce geostatistical realizations. The algorithm only needs the proper definition of all the parameters to be used by HydroGeoSphere (grid matching with SGems, position of the wells, pumping rate, facies properties, boundary conditions, etc.). The PPM algorithm will automatically seek solutions fitting both hydrogeological data and geostatistical constraints. Through the inversion process, the initial geostatistical realization is perturbed. Only geometrical features of the model are affected, i.e. we do not attempt to directly find the optimal value of hydrogeological parameters, but the optimal spatial distribution of facies whose prior distribution is quantified in a training image. The algorithm can be divided in three steps. In the first step, we use SGems to generate an initial facies model with the multiple-point geostatistical algorithm SNESIM (single normal equation simulation). The facies model is composed of several categories representing hydrological facies (e.g. gravel, sand and clay). It can be conditioned using hard data (borehole data) and/or soft data (e.g. geophysical data). We then run a first flow simulation with HydroGeoSphere. This requires defining hydrogeological parameters (porosity, hydraulic conductivity, etc.) for each category of the facies model to create a hydrogeological model. The response of the latter model is compared to the expected one through an objective function. In the second step, a perturbation to the facies model is computed using a single parameter called rD. This perturbation is used to generate a new facies model with SGems and calculate a new objective function value via HGS, as done in the first step. An inner loop optimizes the value of rD. In the third step, we verify if the objective function of the best fitting model is smaller than a predefined value. If it is the case, we stop the algorithm, otherwise we go back to step 2 until convergence. We illustrate the methodology with a synthetic example in an alluvial aquifer. The model is based on a training image depicting gravel channels and clay lenses in a coarse sand aquifer. We simulate a pumping test and inverse water level data recorded at 9 wells using our implementation of the PPM algorithm. Using this method, it is possible to generate multiple solutions and to derive a posterior probability of the facies distribution. [less ▲]

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See detailA MATHEMATICAL MODEL FOR CELL/MATRIX GROWTH ON 3D SURFACES USING THE LEVEL SET METHOD.
Guyot, Yann ULg; Papantoniou, Ioannis; Chai, Yoke Chin et al

Conference (2013, April 03)

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See detailUsing Brand constellation to segment the market: a goal systemic perspective
Brandt, Céline ULg; Hammedi, Wafa

Conference (2013, April 03)

This paper is aiming to expand the literature on consumption constellation by bridging the gap with the goal-oriented perspective and cognitive networks. We emphasize how brands could be considered as ... [more ▼]

This paper is aiming to expand the literature on consumption constellation by bridging the gap with the goal-oriented perspective and cognitive networks. We emphasize how brands could be considered as complementary means to reach high-level goals following the consumption constellation theory. This research also extend the knowledge on segmentation, first by recommending segmentation based on goals and means, and secondly by providing an operational method to capture these segments. Practically, we first collected data on the consumers’ hierarchy of goals in order to build a typology of goals and relate them to the consumers’ lifestyles. Secondly, brand constellations were elicited and mapped by the consumers, using brand concept mapping. Thirdly, network analytics were used to interpret the networks. [less ▲]

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See detailLes empereurs julio-claudiens et les lettres grecques
Rochette, Bruno ULg

Conference (2013, April)

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See detailWhat asteroseismology can teach us about stellar evolution: the case of subdwarf B stars
Van Grootel, Valérie ULg; Fontaine, Gilles; Charpinet, Stephane et al

Conference (2013, April)

Subdwarfs B (sdB) stars are hot (Teff=20,000-40,000 K) and compact (log g= 5.0-6.2) evolved objects that form the very hot end of the horizontal branch, the so-called Extreme Horizontal Branch (EHB ... [more ▼]

Subdwarfs B (sdB) stars are hot (Teff=20,000-40,000 K) and compact (log g= 5.0-6.2) evolved objects that form the very hot end of the horizontal branch, the so-called Extreme Horizontal Branch (EHB). Understanding the formation of sdB stars is one of the remaining challenges of stellar evolution theory. Competing scenarios have been proposed to account for the existence of such evolved objects, and give quite different mass distributions for resulting sdB stars. Detailed asteroseismic analyses, including mass estimates, of 15 pulsating hot B subdwarfs have been published since a decade. The masses have also been reliably determined by light curve modeling and spectroscopy for 7 sdB components of eclipsing or reflection binaries. I will present in the talk the empirical mass distributions of sdB stars on the basis of these samples. I will discuss how these empirical mass distributions, although still based on small-number statistics, compare with the expectations of stellar evolution theory. In particular, the two He-white dwarfs merger scenario does not seem to be the dominant channel to form isolated sdB stars, while the post-red giant branch scenario is reinforced. This opens new questions on the extreme mass loss of red giants to form extreme horizontal branch stars, possibly in connection with the recently discovered close planets orbiting sdB stars. [less ▲]

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See detailSelf-shuffling words
Charlier, Emilie ULg

Conference (2013, April)

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See detailDroit international privé notarial : actualités 2005-2013
Wautelet, Patrick ULg

Conference (2013, April)

Le texte fait le point sur les grands développements du droit international privé, dans ses aspects qui intéressent le notariat, depuis 2005. L'accent est mis en particulier sur les développements du ... [more ▼]

Le texte fait le point sur les grands développements du droit international privé, dans ses aspects qui intéressent le notariat, depuis 2005. L'accent est mis en particulier sur les développements du droit international privé européen. Le texte synthétise également les apports de la jurisprudence relative au Code de droit international privé belge. [less ▲]

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See detailComparison of ground-based remote sensing and in-situ observations of CO, CH4 and O3, accounting for representativeness uncertainty
Henne, S.; Steinbacher, M.; Mahieu, Emmanuel ULg et al

Conference (2013, April)

The EC project NORS (Demonstration Network Of ground-based Remote Sensing Observations in support of the GMES Atmospheric Service) aims at demonstrating the value of ground-based remote sensing data for ... [more ▼]

The EC project NORS (Demonstration Network Of ground-based Remote Sensing Observations in support of the GMES Atmospheric Service) aims at demonstrating the value of ground-based remote sensing data for quality assessment and improvement of the GMES products. As part of NORS CO, CH4, O3 and NO2 tropospheric products as obtained by ground-based remote sensing within the Network for the Detection of Atmospheric Composition Change (NDACC) are compared to continuous surface in-situ measurements that are reported on common international reference scales within the Global Atmospheric Watch (GAW) Programme. However, a direct comparison between the different methods is hindered by different sampling volumes, introducing uncertainties due to representativeness. Here we present a novel method that utilises high-resolution, backward Lagrangian particle dispersion modelling to characterise the transport history of different sampling volumes. Sampling volumes are defined as infinitesimally small point volumes for the in-situ observations and as separate profile segments with horizontal and vertical extent for the remote sensing observations. The characterisation is then used (a) to filter times for which a direct comparison between in-situ and remote sensing data is unfavourable (large representativeness uncertainty) and (b) to construct vertical profiles from the in-situ observations, taking additional information from large scale atmospheric composition models into account. These so called “in-situ” profiles are supposed to be more comparable to the remote sensing profile as the surface value itself, while conserving the high accuracy information of the latter and projecting it onto the profile. Therefore, these profiles allow for a more direct comparison and validation of the remotely sensed profiles. The technique was first applied at two of the four NORS demonstration sites (Jungfraujoch, Switzerland and Izana, Spain) and to the comparison of remote sensing Fourier-transform infrared spectrometer (FTIR) measurements of CO, CH4, and O3 with the responding in-situ observations. While previous studies generally showed good agreement between the two kinds of observation, considerable amounts of scatter were evident. Selecting only situations with relatively small representativeness uncertainty reduces this scatter. Folding the “in-situ” profiles with the averaging kernels of the FTIR retrieval gives a more realistic comparison result that is not influenced by any a-priori assumptions. Results are also discussed with respect to season, time of day and weather type. [less ▲]

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See detailHigh energy environment offshore deposits in the western Gulf of Corinth, Greece
Beckers, Arnaud ULg; Mortier, Clément; Beck, Christian et al

Conference (2013, April)

Detailed reference viewed: 46 (13 ULg)
See detailAb Initio Molecular Dynamics Simulation of Liquid and Amorphous Te
Raty, Jean-Yves ULg; Malcioglu, Osman Baris; Bichara, Christophe

Conference (2013, April)

Contrary to almost all other elements, liquid and amorphous phases of pure tellurium have proven difficult to simulate using ab initio molecular dynamics. Standard density functional theory calculations ... [more ▼]

Contrary to almost all other elements, liquid and amorphous phases of pure tellurium have proven difficult to simulate using ab initio molecular dynamics. Standard density functional theory calculations yield structures in relatively poor agreement with available diffraction experiments at low temperature, especially regarding first neighbor distance and coordination number, which are strongly overestimated in the simulations. Tellurium being a key component of many phase change materials, this poor structural description of its disordered phases raises important issues about the ability of ab initio molecular dynamics to generate accurate structural models of amorphous phases. In this work, we use ab initio molecular dynamics performed under constant volume (experimental values) conditions to simulate liquid Tellurium structure and dynamics along its density anomaly. We test different exchange correlation functionals and approximations, and show their influence on liquid and amorphous structures. In particular, we show that the treatment of dispersion forces is yielding a clear improvement over recent hybrid functional calculations [1], with significant local order modifications in both phases. Especially, the structure evolution along the density anomaly is shown to be related to the creation of many interconnections between Te chains, these chains having increasing lengths upon temperature reduction. In the amorphous phase, Te chains are almost perfectly isolated with specific dihedral angle distributions. These structural changes are reflected on dynamical properties, such as atomic diffusion coefficient and vibrational density of states. We then apply the same method to revisit the structure of some Te based alloys. [1] J. Akola, R. O. Jones, S. Kohara, T. Usuki, and E. Bychkov, Phys. Rev. B 81, 094202 (2010). [less ▲]

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See detailWestern lowland gorilla populations and logging concessions: is the coexistence possible?
Haurez, Barbara ULg; Petre, Charles-Albert ULg; Doucet, Jean-Louis ULg

Conference (2013, April)

Timber exploitation is rapidly expanding throughout the Congo Basin. Around 26 % of the moist forests are devoted to logging activities. Logging concessions largely overlap with the range of western ... [more ▼]

Timber exploitation is rapidly expanding throughout the Congo Basin. Around 26 % of the moist forests are devoted to logging activities. Logging concessions largely overlap with the range of western lowland gorilla (WLG) considered as critically endangered by IUCN. However, this species could play an essential role in maintaining vegetal diversity notably through seed dispersal services. Particularly some tree species harvested for their timber may be dispersed by WLG. In this communication interactions between WLG and a timber exploitation are studied in Central Gabon. WLG density is estimated in an Annual Allowable Cut (AAC), and nesting behavior is described. Seeds dispersed by WLG are identified through fecal analysis and germination trials are conducted to assess seed viability after gut passage. Four treatments are realized for the most abundant species: passed seeds, passed seeds in fecal matrix, seeds surrounded by fresh pulp and seeds extracted from fresh fruits. A relatively high WLG density is observed in the AAC (2.0 weaned gorillas/km²). WLG nest preferentially in open terra firme forest and frequently use old logging road covered with herbaceous vegetation for nesting and feeding. They avoid nesting in closed terra firme forest. Seed dispersal and impacts of the passage in gorilla’s gut on seed germination are currently described. Germination success after gut passage depends on the seed species and varies from 0.0 to 100% in the course of monitoring time. The first results of this study suggest that timber exploitation and WLG conservation are not mutually exclusive. WLG are important agents of forest regeneration by dispersing seeds in logged areas. Nest sites in logging gaps could be particularly favorable for seedlings development. This consideration must encourage forest managers to strengthen WLG-conservative practices in their concessions. [less ▲]

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See detailLa photogrammétrie: un procédé pour mesurer les arbres à troncs irréguliers
Bauwens, Sébastien ULg; Fayolle, Adeline ULg; Nzenga, Alide Kidimbu et al

Conference (2013, April)

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See detailEvolving science, technology and innovation policies in Belgium: a comparative study
Charlier, Nathan ULg

Conference (2013, April)

Science, technology and innovation (STI) policies have gone through deep changes since the early 80’s. Multiple scholars have shown that there are new forms of links, or a renewed “contract” between ... [more ▼]

Science, technology and innovation (STI) policies have gone through deep changes since the early 80’s. Multiple scholars have shown that there are new forms of links, or a renewed “contract” between science, as an institution, and the society: effects of neoliberalism, public controversies or technology assessment (TA) practices are some common features of this transformation. Innovation is pushed forward by policymakers as a crucial tool for economic growth and competitiveness of political entities. In other words, there is a new regime of STI governance. As a PhD student, I investigate the policies of science and innovation in Belgium. Since the regionalization of these competences in the 1980’s, the STI regimes have evolved separately in Flanders and Wallonia. The goal of my research is to depict and compare how constitutive elements of the regimes such as discourses, tools, institutions, networks, etc. have changed in the two Regions. Adopting a cognitive approach in policy analysis, I focus on the imaginaries or master narratives that shape programs and individuals at different policy levels. These levels range from the “micro” (individual interactions in the institutions) to the “macro” (the EU and OECD), the “meso” level being the core of the research question (regional programs and institutions). I seek to point out the local enactment of ideas such as “regional competitiveness”, “innovation-led growth”, “clustering” and its impact on STI regime. The research relies on document analysis, participant observation, and in depth semi-structured interviews designed as life stories of key STI informants. [less ▲]

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See detailRisk Horizon and Expected Market Returns
Hübner, Georges ULg; Lejeune, Thomas ULg

Conference (2013, April)

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See detailParametric numerical study of seismic slope stability and the Newmark method
Havenith, Hans-Balder ULg; Torgoev, Almazbek ULg; Lamair, Laura ULg

Conference (2013, April)

2D dynamic modelling of seismic slope stability is applied to a landslide-prone area in Central Asia, the Mailuu-Suu Valley, situated in the south of Kyrgyzstan. The calculations are made with models ... [more ▼]

2D dynamic modelling of seismic slope stability is applied to a landslide-prone area in Central Asia, the Mailuu-Suu Valley, situated in the south of Kyrgyzstan. The calculations are made with models constructed from over 30 profiles located in the target area, presenting different geological, tectonic and morphological settings. One part of the profiles were selected within landslide zones, the other part was selected in stable areas. Many of the landslides are complex slope failures involving falls, rotational sliding and/or planar sliding and flows. These input data were extracted from a 3D structural geological model built with the GOCAD software. Geophysical and geomechanical parameters were defined on the basis of results obtained by multiple surveys performed in the area over the past 15 years. These include geophysical investigation, seismological experiments and ambient noise measurements. Dynamic modelling of slope stability is performed with the UDEC version 4.01 software that is able to compute deformation of discrete elements. Inside these elements both elasto-plastic and purely elastic materials (similar to rigid blocks) were tested. Various parameter variations were tested to assess their influence on the final outputs. For a few models groundwater flow is included. The total parametric study involved more than 100 different models (about 800 computation hours). Preliminary results allow us to compare Newmark displacements computed using different GIS approaches (Jibson et al., 1998; Miles and Ho, 1999, among others) with the displacements computed using the original Newmark method (Newmark, 1965, here simulated seismograms were used) and displacements produced along joints by the corresponding 2D dynamical models. The generation of seismic amplification and its impact on peak-ground-acceleration, Arias Intensity and permanent slope movements (total and slip on joints) is assessed for numerous morphological-lithological settings (curvature, slope angle, surficial geology, various layer dips and orientations) throughout the target area. The final results of our studies should allow us to define the limitations of the simplified GIS-based Newmark displacement modelling; thus, the verified method would make landslide susceptibility and hazard mapping in seismically active regions more reliable. [less ▲]

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See detailInvestigation of edge effect on wood density in recent tropical forest edges in Yangambi Man and Biosphere Reserve
de Haulleville, Thalès ULg; Bogaert, Jan ULg; Beeckman, Hans

Conference (2013, April)

Rapid development of lumbering activities in tropical forested areas has an important impact on carbon stocks and landscape configuration. Indeed, lumbering tend to fragment forest patches, extend edges ... [more ▼]

Rapid development of lumbering activities in tropical forested areas has an important impact on carbon stocks and landscape configuration. Indeed, lumbering tend to fragment forest patches, extend edges length, and expose core areas to non-forested ecosystems. These exposed core areas then undergo new constraints that can lead to a shift in their ecological features, called the edge effect. We investigate the possible presence of an edge effect on wood density in Yangambi reserve. Wood density (along with diameter and height) is a key feature for biomass estimations in tropical forests. Thus, fluctuations of wood density in forest edges could lead to incorrect estimations of carbon stocks. Ten 1ha plots were installed in core and recent (5 to 10 years) forest¿s edges. Trees were measured and wood samples were collected for density analysis. We focused on 2 main research questions: 1) Does the edge effect induce the emergence of species with a higher or lower wood density in edge area? 2) Does wood density differ amongst individuals of the same specie in core and in edge area? While the data is still being explored as we write, preliminary results seem to indicate that there is no significant difference between the overall mean wood density in edge and core plots. Density differences amongst species are still under exploration. If this behaviour still holds, this would imply that the fragmentation of a forested landscape has no short-term effect on the overall forest wood density and thus, no effect on biomass estimations. [less ▲]

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See detailEvolution de la ressource ligneuse et des stocks de carbone dans le bassin d’approvisionnement en bois énergie de la ville de Kinshasa (RDC)
Dubiez, Emilien; Gond, Valery; Peltier, Régis et al

Conference (2013, April)

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See detailSupervening Events and Contract Law: A Comparative and Critical Analysis
Onclin, François ULg

Conference (2013, April)

The binding force of contracts (pacta sunt servanda) is a basic rule in most – if not all – legal systems. Parties will therefore be liable in the event they failed to perform an obligation provided ... [more ▼]

The binding force of contracts (pacta sunt servanda) is a basic rule in most – if not all – legal systems. Parties will therefore be liable in the event they failed to perform an obligation provided within the contract. However, there are situations which excuse non-performance due to unforeseen circumstances that occurred subsequently to the conclusion of a contract. While most jurisdictions excuse the debtor's non-performance in case of impossibility to perform, only a few provide for remedies when performance has become by far more burdensome for one contracting party. It is to be noted that there is an increasing trend to adopt a general doctrine of hardship, as illustrated by the European codification projects. As a counterexample, Belgium remains attached to the pacta sunt servanda principle and rejects the so-called “theory of imprévision”. The English frustration doctrine seems to provide for an in-between position. In a first part, this paper will briefly discuss the mechanisms dealing with unexpected events which have been adopted in two different legal systems (England and Belgium) and in one European soft law instruments (PECL). In a second part, the paper will critically compare the mechanisms applied in the observed legal systems. [less ▲]

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See detailLes perles en verre de la nécropole de Bossut–Gottechain : recettes et fabrication
Mathis, François ULg; Vrielynck, Olivier; Leroy, Amandine et al

Conference (2013, April)

La nécropole de Bossut Gottechain est une des plus grandes nécropoles mérovingiennes jamais trouvée en Belgique. Les fouilles conduites entre 2002 et 2006 ont permis de mettre au jour 436 tombes sur une ... [more ▼]

La nécropole de Bossut Gottechain est une des plus grandes nécropoles mérovingiennes jamais trouvée en Belgique. Les fouilles conduites entre 2002 et 2006 ont permis de mettre au jour 436 tombes sur une période d’occupation s’étalant de 470 à 670 ap J.C. Ces tombes contenaient un matériel funéraire important composé d’armes, d’accessoires de vêtement, de récipients en céramique, en métal et en verres, et de bijoux parmi lesquels une quantité inhabituellement importante de perles. Plus de 8000 spécimens ont été retrouvés, la majorité en verre (environ 6800 soit 82% du corpus), mais aussi en ambre, pierre, céramique ou métal. L’abondance de ce matériel et la datation fine de ce site ont permis de dresser une typo-chronologie précise de cette production affinant la description des types et des périodes d’utilisation déjà connus. Nous avons voulu en plus de l’étude purement archéologique de ces perles porter une attention particulière au matériau qui les compose. Une campagne d’analyse physico-chimique a donc été engagée. La méthode choisie a été la spectroscopie PIXE- PIGE en faisceau extrait, cette méthode d’analyse non invasive et très sensible aux éléments légers étant particulièrement adaptée à notre corpus d’objets nombreux mais précieux. Ces analyses ont été conduites sur la ligne de faisceau extrait ARCHEO de l’accélérateur de l’Institut de Physique Nucléaire, Atomique et de Spectroscopie de l’université de Liège. Nous avons pu analyser plus de trois cent perles. Une attention particulière a été portée sur les perles en verres jaune et noire, abondamment représentées dans le corpus, ainsi que sur plusieurs perles dont le type rare ou unique sur le site nous interrogeait. Les résultats de cette recherches ont été particulièrement fructueux car nous avons pu mettre en exergue la pratique connue du remploi de perles en verre romain ou protohistorique à l’époque mérovingienne, et confirmer le changement de recettes d’opacifiant/colorant dès le tout début de la période mérovingienne où l’utilisation d’oxydes d’étain ou de stannates de plomb est généralisée et celle des antimoniates complètement abandonnée. Enfin nous avons pu mettre en évidence l’utilisation d’un verre très riche en plomb pour la fabrication de perles noires dès le début de la période d’occupation du site, verre qui à notre connaissance n’a jamais été documenté [less ▲]

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See detailTélédétection pour la typologie forestière et l'inversion de biomasse en Afrique centrale.
Barbier, N; Bastin, Jean-François ULg; Ploton, P et al

Conference (2013, April)

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See detailQuadratization of symmetric pseudo-Boolean functions
Crama, Yves ULg

Conference (2013, April)

We consider the problem of minimizing an arbitrary pseudo-Boolean function f(x), that is, a real-valued function of 0-1 variables. In recent years, several authors have proposed to reduce this problem to ... [more ▼]

We consider the problem of minimizing an arbitrary pseudo-Boolean function f(x), that is, a real-valued function of 0-1 variables. In recent years, several authors have proposed to reduce this problem to the quadratic case by expressing f(x) as min{g(x,y):y∈{0,1}^m}, where g(x,y) is a quadratic pseudo-Boolean function of x and of additional binary variables y. We say that g(x,y) is a quadratization of f. In this talk, we investigate the number of additional variables needed in a quadratization when f is a symmetric function of the x-variables. The cases where f is either a positive or a negative monomial are of particular interest, but some of our techniques also extend to more complex functions, like k-out-of-n or parity functions. Joint work with Martin Anthony, Endre Boros and Aritanan Gruber [less ▲]

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See detailClauses d'élection de for et procédures concurrentes : les nouveautés du Règlement Bruxelles Ibis
Wautelet, Patrick ULg

Conference (2013, April)

Ces documents constituent le support de présentation utilisé lors d'une conférence consacrée au Règlement Bruxelles Ibis. Ils font le point sur les nouveautés apportées au régime des clauses d'élection de ... [more ▼]

Ces documents constituent le support de présentation utilisé lors d'une conférence consacrée au Règlement Bruxelles Ibis. Ils font le point sur les nouveautés apportées au régime des clauses d'élection de for ainsi qu'au traitement réservé aux procédures concurrentes [less ▲]

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See detailPaléotératologie ou le diagnostic anténatal 2000 ans plus tard
Ricciardetto, Antonio ULg; Charlier, Philippe

Conference (2013, March 30)

Detailed reference viewed: 9 (2 ULg)
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See detailKDIGO – prise en charge de l’hypertension artérielle en dialyse
Krzesinski, Jean-Marie ULg

Conference (2013, March 28)

1. A lower target may be chosen in CKD patients with proteinuria but after individualized risk-benefit assessment. The price to pay is a need for a higher number of antiHTA drugs and a risk of more ... [more ▼]

1. A lower target may be chosen in CKD patients with proteinuria but after individualized risk-benefit assessment. The price to pay is a need for a higher number of antiHTA drugs and a risk of more frequent side-effects. 2. Confirmation of a high BP level is necessary through out-of-the clinic BP measurement In CKD, ABPM offers night-time BP information useful for CV and renal risk evaluation. BP variability is a new point to be considered in the future. Proteinuria but also other specific risk factors (Phosphate, anemia, inflammation,..) should be integrated in the management of hypertension in CKD [less ▲]

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See detailThe Semantic-syntactic Interface
Winand, Jean ULg

Conference (2013, March 28)

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Peer Reviewed
See detailLe management public dans la sphère scolaire : émergence des pratiques de médiation scolaire au sein de trois « mondes » d’acteurs
Gérard, Julie ULg

Conference (2013, March 28)

This article aims to examine changing practices of school mediation in three “worlds” of actors – the educational world, the manager world and the “living together” world – crossing three fields of ... [more ▼]

This article aims to examine changing practices of school mediation in three “worlds” of actors – the educational world, the manager world and the “living together” world – crossing three fields of research in sociology: the interactionism, the sociology of public management, and the sociology of school. Traditionally performed by the institutional mediator of the school or, occasionally, by a local mediator, the variety of contemporary mediation practices appears as a consequence of the organizational challenges of New Public Management of Belgium. I will first explain the background of the changes which occurred in the educational field and examine the changing role of school stakeholders. Then, I will present three case studies which illustrate how schools are anchored in the three “worlds” of actors mentioned above. Finally, I will discuss the results giving the first lines of interpretation of this school evolution. [less ▲]

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See detailMeasuring 25-hydroxyvitamin D: where are we standing in 2013?
CAVALIER, Etienne ULg

Conference (2013, March 27)

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See detailLaplace et le développement des politiques scientifiques en Europe
Grell, Chantal; Vandersmissen, Jan ULg

Conference (2013, March 27)

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See detailSingularly perturbed phase response curves
Sacré, Pierre ULg; Franci, Alessio ULg; Sepulchre, Rodolphe ULg

Conference (2013, March 26)

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See detailImpacts of a unicellular mechanism on network behaviors
Dethier, Julie ULg; Drion, Guillaume; Franci, Alessio et al

Conference (2013, March 26)

Parkinson’s disease (PD) is a neurodegenerative disorder af- fecting the basal ganglia (BG), a set of small subcortical nervous system nuclei. The hallmark of the disease is a dopaminergic denervation of ... [more ▼]

Parkinson’s disease (PD) is a neurodegenerative disorder af- fecting the basal ganglia (BG), a set of small subcortical nervous system nuclei. The hallmark of the disease is a dopaminergic denervation of the striatum—the input stage of the BG—altering information patterns along movement- related ganglia-mediated pathways in the brain. Severe mo- tor symptoms result from the pathological state: tremor at rest, bradykinesia—the slowness and impaired scaling of voluntary movement—and akinesia—the poverty of volun- tary movements. It is still unclear how dopamine depletion causes those motor symptoms. Experimental studies have shown that abnormally synchronized oscillatory activities— rhythmic bursting activity at the unicellular level and beta frequency band (from 8 to 30Hz) oscillations at the network level—emerge in PD at multiple levels of the BG-cortical loops and correlate with motor symptoms. The mechanisms underlying these pathological beta oscillations remain elu- sive. We propose that a cellular mechanism generates burst- ing activities and beta band oscillations at the network level. [less ▲]

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See detailWho's Afraid of Albert Camus? The Memorialization of French Algeria and the Controversy over Camus' Legacy
Munos, Delphine ULg

Conference (2013, March 23)

Until recently, in France, Albert Camus was regularly dismissed as a consensual writer and a minor philosopher -- for the dubious reason that his work figured too heavily in syllabuses for secondary ... [more ▼]

Until recently, in France, Albert Camus was regularly dismissed as a consensual writer and a minor philosopher -- for the dubious reason that his work figured too heavily in syllabuses for secondary schools. A year before the 50th anniversary of Camus’ death, issues about the memory of Camus in France started gaining new momentum in the face of former French president Nicolas Sarkozy’s attempt to have the author’s remains transferred to the Pantheon. Although Sarkozy’s ploy was successfully opposed by Camus’ son, who claimed (unlike Camus’ daughter) that moving his father’s remains would be contrary to the deceased’s wishes, the struggle over the writer’s legacy dramatically resurfaced a few years later. In Fall 2012, the project of a major Camus exhibition in Aix-en-Provence for Marseille-Provence European Capital of Culture 2013 was stalled, following on, first, the brutal eviction of its curator, French Algeria historian Benjamin Stora, and second, the consequent underhanded appointment of middlebrow philosopher Michel Onfray, before the latter’s final decision to back off from what he called “la pétaudière” (the madhouse). Given that the forced replacement of Stora by Onfray was pronounced by arch-conservative Aix-en-Provence mayor Maryse Joissains-Masini, the French and Algerian presses have been unanimous in interpreting Stora’s eviction as a result of his resolve to lay stress on one of the most silenced aspects of Camus’ work -- namely, his problematic status as a ‘French’ writer born on North African soil, and his impossible French/Algerian identity as a Pied-Noir who opposed both the OAS and the FLN. “What they did not like in him was the Algerian,” reads the Annex to Camus’ unfinished novel, The First Man. This paper sets out to examine how, beyond its escapist character, Camus’ ‘Mediterranean utopia’ still has a potential for raising unsettling questions about post-colonial Algeria and post-imperial France alike, in a contemporary context where a French apology for more than a century of colonization in Algeria remains overdue. [less ▲]

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See detailRecherche-action : "se mettre en recherche" - , Liège, le 23 mars 2013
Absil, Gaëtan ULg

Conference (2013, March 23)

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See detailParticularités de la personne âgée malade
Petermans, Jean ULg

Conference (2013, March 22)

Detailed reference viewed: 29 (1 ULg)
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See detailScientific basis for transnational flood management in the Meuse basin
Dewals, Benjamin ULg; Huismans, Ymkje; Detrembleur, Sylvain et al

Conference (2013, March 22)

Detailed reference viewed: 50 (25 ULg)
Peer Reviewed
See detailDes élites sans avenir. Contre-valeurs nobiliaires dans le roman dystopique francophone
Stienon, Valérie ULg

Conference (2013, March 22)

Le récit d’anticipation développe des représentations sociales complexes, en particulier lorsqu’il se centre sur les dissensions et dysfonctionnements d’une communauté en difficulté face au conflit ... [more ▼]

Le récit d’anticipation développe des représentations sociales complexes, en particulier lorsqu’il se centre sur les dissensions et dysfonctionnements d’une communauté en difficulté face au conflit mondial, au cataclysme écologique ou au fléau biologique. Représentées sous cet angle, les sociétés futures semblent marquer la fin de la distinction sociale par les privilèges de la fortune, du territoire ou du titre, au profit d’une élite éclairée triomphant par le capital intellectuel, la maîtrise scientifique et la sophistication technologique. Pourtant, les scénarios littéraires de destruction imminente des biens matériels et de reconfiguration géopolitique planétaire montrent cette élite en fâcheuse posture et insistent volontiers sur son improductivité, ses conjectures farfelues, son autosuffisance et sa méconnaissance du lien social. Précipitant la fin d’une civilisation, dictateurs technocrates et savants-prophètes sont alors assimilés à une classe aristocratique à bannir, conviction qui motive notamment cette exclamation emportée : « Ces savants, ces aristocrates de la pensée, qu’on les pende ! » (Jacques Spitz, L’Agonie du globe, 1935). Conséquence de l’échec face à l’adversité, le franchissement régressif inverse du seuil nature/culture prépare une nouvelle hiérarchie anthropologique du sang. Elle se caractérise par une urgence de préservation vitale qui se substitue à l’impératif de pureté de la lignée à maintenir. L’imaginaire d’une décadence par le sang s’en trouve reconfiguré sous diverses formes : maladies sélectives selon le capital santé du degré d’ascendance (Daniel Halévy, Histoire de quatre ans, 1903) ; formes de vie parasites se nourrissant des globules rouges humains (Rosny Aîné, La Mort de la Terre, 1910) ; guerre bactériologique ciblée (Henri Allorge, Le Grand Cataclysme, 1922) ; anthropophagie due aux radiations des « machines à sang » alimentées par des corps humains (José Moselli, La Fin d’Illa, 1925), etc. Cette communication étudie la cohérence et l’évolution de ces constats thématiques dans une trentaine de romans parus entre 1900 et 1950, qui partagent les caractéristiques narratives de l’anticipation rationnelle négative. Trois aspects seront examinés en particulier : la constitution du point de vue narratif, la caractérisation des protagonistes et l’évolution diégétique déceptive. [less ▲]

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See detailACV et Ecoconception: illustration de la démarche au sein de Knauf Insulation.
Gerbinet, Saïcha ULg; Briard, Vincent; Léonard, Angélique ULg

Conference (2013, March 22)

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Peer Reviewed
See detailThe Violence of Self-Starvation
Delville, Michel ULg; Norris, Andrew

Conference (2013, March 21)

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See detailRetrospective analysis of Belgian experience with intestinal transplantation
Ceulemans, L.J.; DE ROOVER, Arnaud ULg; DETRY, Olivier ULg et al

Conference (2013, March 21)

Aim: The only alternative to Total Parenteral Nutrition (TPN) for complicated intestinal failure is Intesti- nal Transplantation (ITx) which is perceived as a high-risk procedure with inferior results ... [more ▼]

Aim: The only alternative to Total Parenteral Nutrition (TPN) for complicated intestinal failure is Intesti- nal Transplantation (ITx) which is perceived as a high-risk procedure with inferior results compared to other organ Tx. Therefore ITx has been rarely applied in Belgium. In a multicenter retrospective review, we analyzed the overall Belgian experience with ITx. Methods: The Belgium Liver Intestine Committee organized a survey among all Belgian Tx centers, based on the patient-specific data form of the international ITx registry. Overall activity and indications were reviewed. Patient/graft survival was calculated (Kaplan-Meier). Nutritional (TPN) independence and Quality of Life (QoL) (Karnofsky score) were analyzed. Results: 21 ITx were performed in 20 patients (03/99-11/12), distributed among 5 centers: KUL (12), ULg (5), UZG (2), UCL (1), UZA (1). Median age was 38y(8mo-56y). Male/female ratio was 10/10. 5 were pediatrics (<18y) and 15 adults. Indications were anatomical or functional short bowel syndrome: intestinal ischemia(5), volvulus(5), Crohn(2), chronic intestinal pseudo-obstruction(2), splanchnic thrombosis(2), Churg-Strauss(1), necrotizing enterocolitis(1), microvillus inclusion(1), intestinal atresia(1) and chronic rejection of a first ITx(1). Most patients also suffered from TPN-associated com- plications (infection/shortage of venous access or liver failure). An isolated small bowel was trans- planted in 9 patients (plus kidney Tx in 2; plus pancreas Tx in 1); 10 received a combined liver and ITx; 2 received a multivisceral Tx. At time of Tx, 11 patients were hospitalized and 10 at home. 20 grafts were procured from deceased donors; one segmental intestinal graft was procured from a living donor. ABO blood group was identical in 63%, compatible in 37%. Median cold ischemia time was 5h30 ́(3h17 ́-9h31 ́). All patients received tacrolimus-based immunosuppression. Basiliximab (anti-IL2 receptor antibody) induction was administered in 16 patients. In 11 patients donor specific blood was transfused as part of an immunomodulatory protocol. 5-year patient and graft survival is 59% and 55.6%, respectively. 8 patients died: 6 to sepsis, 1 to intracerebral hemorrhage; 1 sudden death re- mained unexplained. 1 patient developed postTx lymphoma. 2 chronic rejections occured for which one reTx was performed. Of 12 survivors (median follow-up 1870 days), 11 are nutritionally independent (TPN-free) and 10 have a Karnofsky score >90%. Conclusions: ITx has come of age in Belgium. During the last 13 years, 21 ITx were performed in 5 centers. A 5-year patient/graft survival of 59%/55.6% is achieved, which is similar to results reported by the International ITx registry. In Belgium, awareness should grow that ITx represents a life-saving (and QoL improving) treatment in selected patients with reduced life expectancy due to significant complica- tions from TPN and intestinal failure. [less ▲]

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See detail"'With love for my people': Chika Unigwe's Night Dancer"
Tunca, Daria ULg

Conference (2013, March 21)

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Peer Reviewed
See detailRamses. A tool for linguistic analysis of Late Egyptian
Winand, Jean ULg

Conference (2013, March 20)

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See detailMagnetic hybrid materials for triggered drug delivery and optical properties of intraocular lens
Liu, Ji ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg et al

Conference (2013, March 20)

Mesoporous silica nanoparticles have great potential for drug delivery system (DDS) due to their large volume for encapsulation of guest molecules in the porous channels. Due to the specific magnetic ... [more ▼]

Mesoporous silica nanoparticles have great potential for drug delivery system (DDS) due to their large volume for encapsulation of guest molecules in the porous channels. Due to the specific magnetic responsiveness, magnetic nanoparticles can penetrate body tissues under a magnetic guidance, providing a potential platform for magnetic-directed DDS. Furthermore, a sharp local heating can be obtained for superparamagnetic nanoparticles when exposed to an alternating magnetic field (AMF). This specific property opens up the possibility of the application in tumor treatments. Here, we fabricated maghemite/SiO2 mesoporous nanohybrids DDS with phase-changed molecules as gate-keepers. The channels were envisaged to be closed in the biological systems during the delivery; however, opened when exposed to external heating or internal heating from hyperthermia generated by the maghemite cores. Thus the uploaded drug can diffuse into the surrounding medium. MTS assay showed a good cytocompatibility of the vehicles in both mouse L929 cells and cancer MEL-5 cells, and also internalization into MEL-5 cells was confirmed by Fluoresce microscopy, fluoresce-activated cell sorting (FACS) and TEM techniques. The release of drugs can be controlled by varying the concentration of the nanohybrids vehicles, the period of AMF treatment, or both. In-vivo triggered-release of doxorubicin into MEL-5 cells was confirmed by the sharp decrease in cell viability. This DDS can be designed for controlled release to an urgent physiological need via chemotherapy, hyperthermia therapy, or both. [less ▲]

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See detailHot stars in the whole CoRoT mission
Briquet, Maryline ULg

Conference (2013, March 20)

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See detailLes problèmes cutanés liés aux médicaments
GADISSEUR, Romy ULg

Conference (2013, March 19)

Les problèmes cutanés liés aux médicaments

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See detailMatériaux médicaux implantables : le point aujourd’hui
Grandfils, Christian ULg

Conference (2013, March 19)

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See detailLe Remake dans l’art contemporain.
Thonon, Jonathan ULg

Conference (2013, March 19)

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Peer Reviewed
See detailLaser Cooling of Iron Atoms
Bastin, Thierry ULg; Huet, Nicolas ULg; Krins, Stéphanie ULg

Conference (2013, March 18)

We report on the first laser cooling of Iron atoms. Our laser cooling setup makes use of 2 UV laser radiation sent colinearly in a 0.8~m Zeeman slower. One laser is meant for optical pumping of the Iron ... [more ▼]

We report on the first laser cooling of Iron atoms. Our laser cooling setup makes use of 2 UV laser radiation sent colinearly in a 0.8~m Zeeman slower. One laser is meant for optical pumping of the Iron atoms from the ground state to the lowest energy metastable state. The second laser cools down the atoms using a quasi-perfect closed transition from the optical pumped metastable state. The velocity distribution at the exit of the Zeeman slower is obtained from a probe laser crossing the atom beam at an angle of 50 degrees. The fluorescence light is detected using a photomultiplier tube coupled with a boxcar analyzer. The Iron atom beam is produced with a commercial effusion cell working at around 1950 K. Our laser radiations are stabilized using standard saturated-absorption signals in both an Iron hollow cathode absorption cell and an Iodine cell. We will present our experimental setup, as well as the first evidences of cooled down Iron atoms at the exit of the Zeeman slower. [less ▲]

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See detailPrise en charge des patients lithiasiques
GADISSEUR, Romy ULg

Conference (2013, March 18)

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See detailPreparation of drug-loaded scaffolds for biomedical applications using supercritical fluid technology
Champeau, Mathilde; Jérôme, Christine ULg; Tassaing, Thierry

Conference (2013, March 17)

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See detailMicrobiological diagnosis of infectious keratitis
MELIN, Pierrette ULg

Conference (2013, March 16)

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See detailStatistical analysis of Saturn's UV auroral outer emission
Grodent, Denis ULg; Radioti, Aikaterini ULg; Schippers, Patricia et al

Conference (2013, March 15)

Recent observations of Saturn’s aurora with the UVIS spectrograph on-board Cassini not only confirm the presence of a quasi-permanent partial ring of emission equatorward of the main auroral oval, but ... [more ▼]

Recent observations of Saturn’s aurora with the UVIS spectrograph on-board Cassini not only confirm the presence of a quasi-permanent partial ring of emission equatorward of the main auroral oval, but they also increase the number of positive cases and allow for a statistical analysis of the characteristics of this outer emission. This faint but distinct auroral feature appears at both hemispheres in the nightside sector. It magnetically maps to relatively large distances in the nightside magnetosphere, on the order of 9 RS. It was initially thought that pitch angle scattering of electrons into the loss cone by whistler waves would be responsible for the outer auroral emission. Rough estimates suggested that a suprathermal electron population observed with Cassini in the nightside sector between 7 and 10 RS might power this process. However, a new analysis of 7 years of Cassini electron plasma data indicates the presence of layers of upward and downward field aligned currents. They appear to be part of a large-scale current system involving dayside-nightside asymmetries as well as trans- hemispheric variations. This system comprises a net upward current layer, carried by warm electrons, limited to the nightside sector which may as well generate the outer UV auroral emission. The growing dataset of UVIS spectro- images is used to find any such asymmetries in the outer auroral emission. [less ▲]

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Peer Reviewed
See detailAutomatic Aircraft Cargo Load Planning with Pick-up and Delivery
Lurkin, Virginie ULg; Schyns, Michael ULg

Conference (2013, March 15)

This research aims to develop a new mixed integer linear program to solve the containers assignment problem when pickup and deliveries are considered. Given a pool of ULDs and an aircraft with multiple ... [more ▼]

This research aims to develop a new mixed integer linear program to solve the containers assignment problem when pickup and deliveries are considered. Given a pool of ULDs and an aircraft with multiple destinations, we want to obtain a loading plan determining at which positions the ULDs must be assigned in order to minimize simultaneous the quantity of fuel consumed and the number of re-handles. The loading plan should also ensure a number of structural, safety and manoeuvrability constraints. The model has been tested on real instances and provides encouraging results. [less ▲]

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See detailIntérêts et limites de la dialyse nocturne
Krzesinski, Jean-Marie ULg

Conference (2013, March 14)

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