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See detailGestion du stress et de la fatigue, que nous apprend la simulation
Nyssen, Anne-Sophie ULiege

Conference (2013, April 26)

Detailed reference viewed: 74 (5 ULiège)
See detailÀ la limite de l’orthodoxie, aux confins de l’imperium christianum
Close, Florence ULiege

Conference (2013, April 26)

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See detailLa pratique de la Cour pénale internationale à l’épreuve des droits fondamentaux : tentative de transposition d’une contrainte nationale à un contexte globalisé
Deprez, Christophe ULiege

Conference (2013, April 26)

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2013 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 26 avril 2013 par l ... [more ▼]

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2013 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 26 avril 2013 par l'Université Libre de Bruxelles. [less ▲]

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See detail‘Changer de microscope’ : Vers une analyse longitudinale des carrières politiques dans les systèmes multi-niveaux
Dodeigne, Jérémy ULiege

Conference (2013, April 26)

Les modèles de carrière politique en Belgique, au Canada, en Espagne et au Royaume-Uni ont profondément évolué au cours des trois dernières décennies avec l’instauration des parlements régionaux et sous ... [more ▼]

Les modèles de carrière politique en Belgique, au Canada, en Espagne et au Royaume-Uni ont profondément évolué au cours des trois dernières décennies avec l’instauration des parlements régionaux et sous l’effet de leur professionnalisation. De récentes recherches ont démontré que, loin de constituer un simple tremplin vers le niveau national, le niveau subnational constitue une arène politique professionnelle à part entière. En nous basant sur une analyse longitudinale de l’ensemble des 2.450 carrières en Catalogne (n=1.044), en Écosse (n=368), au Québec (n=619) et en Wallonie (n=419) depuis l’instauration des parlements régionaux, nous démontrons tout d’abord que plusieurs modèles de carrière coexistent au sein d’une même région. Pour cela, un ‘changement de microscope’ est requis en utilisant les trajectoires individuelles comme unité d’analyse au lieu des seuls mouvements verticaux entre niveaux de pouvoirs. Enfin, nos résultats en ce qui concerne la variabilité interne des modèles (mesurée en fonction des partis politiques mais aussi du genre et de l’origine territoriale) invitent à des recherches complémentaires pour mieux comprendre les dynamiques de carrière, notamment dans leur dimension identitaire. Jusqu’alors considérée comme une variable explicative secondaire, cette dimension semble au contraire constituer une variable explicative de première ordre dans les quatre régions analysées. [less ▲]

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See detailLes allergies alimentaires : point de vue du biologiste
GADISSEUR, Romy ULiege

Conference (2013, April 25)

Detailed reference viewed: 53 (12 ULiège)
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See detailComputing bounds on the geometrical quality of 2D curvilinear finite elements
Johnen, Amaury ULiege; Remacle, J.-F.; Toulorge, T. et al

Conference (2013, April 25)

The development of high-order computational methods for solving partial differen- tial equations on unstructured grids has been underway for many years. Such meth- ods critically depend on the ... [more ▼]

The development of high-order computational methods for solving partial differen- tial equations on unstructured grids has been underway for many years. Such meth- ods critically depend on the availability of high-quality curvilinear meshes, as one badly-shaped element can degrade the solution in the whole domain (J. Shewchuk, “What Is a Good Linear Finite Element? Interpolation, Conditioning, Anisotropy, and Quality Measures”, Preprint, 2002). The usual way of generating curved meshes is to first generate a straight sided mesh and to curve mesh entities that are classified on the boundaries of the domain. The latter operation introduces a “shape-distortion” that should be controlled if we suppose that the straight sided mesh is composed of well-shaped elements. Quality measures allow to quantify to which point an element is well-shaped. They also provide tools to improve the quality of meshes through optimization opera- tions. Many quality measures has been proposed for quadratic triangular finite element. Recently, X. Roca et al. (“Defining Quality Measures for High-Order Planar Triangles and Curved Mesh Generation”, Proceedings of the 20th Interna- tional Meshing Roundtable, 2011) proposed a technique that allows extending any Jacobian based quality measure for linear elements to high-order iso-parametric planar triangles of any interpolation degree. In this work we propose an efficient method to provide accurate bounds on the mag- nitude of the shape distortion of any triangular and quadrangular curved element. The shape distortion is measured with respect to an ideal element, which can e.g. be an equilateral triangle or the element from the original straight-sided mesh. The key feature of the method is that we can adaptively expand functions based on the Jacobian matrix and its determinant in terms of Be ́zier functions. Be ́zier functions have both properties of boundedness and positivity, which allow sharp computation of minimum or maximum of the interpolated functions. [less ▲]

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See detailNourishing the body, crafting the self, facing the other. Subjectivities and encounters through Moroccan food in Italy
Mescoli, Elsa ULiege

Conference (2013, April 25)

Each individual is composed of material objects and practices that witness one’s personal life history and everyday life and which shape one’s same subjectivity (Julien and Rosselin 2009). Subjectivity ... [more ▼]

Each individual is composed of material objects and practices that witness one’s personal life history and everyday life and which shape one’s same subjectivity (Julien and Rosselin 2009). Subjectivity that is fulfilled through material culture, the performing of which turns out to be a technology of the self (Martin, Gutman, Hutton 1988). Considering the subject as the result of praxeological activities and of the incorporation of objects belonging to one’s meaningful universe of reference and action, my paper aims at exploring the construction of the self of Moroccan female migrants through their body techniques exerted while cooking. Specific gestures are performed to adhere to a cultural heritage which needs to be preserved while living abroad. An essentialized bodily tradition, relying on a set of specific objects, becomes the place where, on the one hand, the members of a community share knowledge. On the other hand, such tradition lets an encounter with otherness take place. As a matter of fact, in the context considered, food is a frequent object of intercultural policies and practices, giving migrants a controlled opportunity to express themselves while producing material culture. A locally held Arabic cooking class, for example, provides the occasion to perform cultural differences (or similarities) by means of corporeal languages. My presentation will consider the body both in its private and public dimensions, since constantly intertwined. Through images and videos I will show what such embodied material knowledge consists of and in which ways it is the object of social dynamics and interactions. [less ▲]

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See detailUse of Life Cycle Assessment in view of Eco-Design for a glass wool process
Gerbinet, Saïcha ULiege; Renzoni, Roberto ULiege; Briard, Vincent et al

Conference (2013, April 25)

Detailed reference viewed: 45 (5 ULiège)
See detailComment les enseignants du primaire et du secondaire planifient-ils leurs enseignements? Etude exploratoire
Scheepers, Caroline ULiege

Conference (2013, April 24)

Comment les enseignants du primaire et du secondaire planifient-ils leurs dispositifs didactiques ? La présente contribution n’a certainement pas l’ambition d’apporter une réponse complète et définitive à ... [more ▼]

Comment les enseignants du primaire et du secondaire planifient-ils leurs dispositifs didactiques ? La présente contribution n’a certainement pas l’ambition d’apporter une réponse complète et définitive à cette question. Pour autant, elle constituera le fil rouge de notre réflexion. Ainsi, nous passerons d’abord en revue différents travaux scientifiques susceptibles de nourrir notre propos. Nous nous intéresserons ensuite au processus de planification tel que décrit pas des enseignants belges en place, instituteurs et agrégés de français de l’enseignement secondaire (inférieur et supérieur). Pour ce faire, a été constituée une enquête visant à questionner les praticiens, plus ou moins chevronnés, quant à leurs pratiques en matière de planification. Les résultats recueillis mettent en lumière des problématiques cruciales, quoique parfois assez peu étudiées jusqu’à présent, pour la recherche et la formation en didactique ou en sciences de l’éducation. [less ▲]

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See detailVocal loading profiles of kindergarten and elementary school teachers
Remacle, Angélique ULiege; Morsomme, Dominique ULiege; FINCK, Camille ULiege

Conference (2013, April 24)

Purpose: Although a global picture exists of teachers’ voice demands in general, few studies have compared specific groups of teachers to determine whether some are more at risk than others to develop ... [more ▼]

Purpose: Although a global picture exists of teachers’ voice demands in general, few studies have compared specific groups of teachers to determine whether some are more at risk than others to develop vocal loading related dysphonia. This study compared vocal loading of kindergarten and elementary school teachers; professional and non-professional vocal load was determined for both groups. Method: Twelve kindergarten and twenty elementary school female teachers were monitored during one workweek using the Ambulatory Phonation Monitor, Model 3200 (KayPENTAX). Vocal loading parameters analyzed were phonation time, F0, SPL, distance dose and cycle dose. A total of 160 days (≈1513 hours) of collected data were analyzed. Results and conclusions: All the parameters were higher for kindergarten teachers than for elementary school teachers in both professional and non-professional environments, but the differences were significant only for the cycle dose and the distance dose (p < .05). The higher vocal load measured in kindergarten teachers suggests that they could be more at risk for developing voice disorders than elementary school teachers. Particular attention should be paid to this specific group of teachers working with young children. Concerning the comparisons between professional and non-professional voice use, significant differences were observed for all parameters (p < .0001), indicating that vocal load was higher in the professional environment for both groups. [less ▲]

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See detailOn-line flow cytometry to detect cell growth rate and membrane damage during bioprocess: focus on the segregation of the microbial population
Brognaux, Alison ULiege; Han, Shanshan; Sorensen, Soren et al

Conference (2013, April 24)

Detailed reference viewed: 43 (13 ULiège)
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See detailFalsification des médicaments: mythe ou réalité ?
Marini Djang'Eing'A, Roland ULiege; Fillet, Marianne ULiege; Vancauwenberghe, Roy et al

Conference (2013, April 24)

La santé publique est de nos jours minée par la problématique des médicaments falsifiés ou de qualité inférieure, avec plusieurs conséquences sanitaires, économiques voire professionnelles. On estime à 7 ... [more ▼]

La santé publique est de nos jours minée par la problématique des médicaments falsifiés ou de qualité inférieure, avec plusieurs conséquences sanitaires, économiques voire professionnelles. On estime à 7% la part du marché pharmaceutique mondial que représenterait ce fléau; l’Afrique, l’Asie et de nombreux pays d'Amérique latine étant les régions les plus touchées avec plus de 30% de médicaments falsifiés. D’après l'OMS, plus de 50% des médicaments achetés à partir des sites internet illégaux sont contrefaits, annihilant très fortement les chances de succès thérapeutique. Ces médicaments viennent dans la plupart des cas des pays asiatiques et de l’Eurasie. Le trafic de faux médicaments est un crime contre l'humanité qui représente environ 50 milliards de dollars par an (10-15 % de plus que le marché de la drogue). Au travers de deux leçons, la situation de la falsification des médicaments sera présentée au grand public dans le but de le sensibiliser à ce fléau. La première leçon présentera la situation en Europe avec un accent sur la Belgique. La problématique du droit à la propriété intellectuelle et de l’encadrement législatif sera abordée, ainsi que la falsification des médicaments modernes et des phytomédicaments, ces derniers étant utilisés par plus de 40% de la population en Europe et aux Etats-Unis. Dans la seconde leçon sera abordée la situation vécue en Afrique. L’approvisionnement en médicaments de qualité par le partage de l’information sera présenté ainsi que les moyens analytiques à la disposition de ce continent pour combattre ce fléau. Des membres du Département de Pharmacie de l’Université de Liège, de l’Agence Fédérale des Médicaments et des Produits de Santé ainsi que du programme QUAMED (Quality Medicines for All) feront partager leur expérience sur cette question d’une brûlante actualité.  [less ▲]

Detailed reference viewed: 109 (24 ULiège)
See detailAdaptive remeshing strategies using solid-shell elements in the numerical simulation of incremental forming processes
de Sena, Jose Idlio; Duchene, Laurent ULiege; Habraken, Anne ULiege et al

Conference (2013, April 24)

Detailed reference viewed: 57 (12 ULiège)
See detailL'automate spirituel : pensée et cinéma chez Walter Benjamin
Barbion, Sébastien ULiege

Conference (2013, April 24)

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See detailContribution to the management of inherited disorders in Belgian Blue Cattle Breed
Sartelet, Arnaud ULiege

Conference (2013, April 23)

Detailed reference viewed: 61 (13 ULiège)
See detailLes problèmes cutanés liés aux médicaments
GADISSEUR, Romy ULiege

Conference (2013, April 23)

Detailed reference viewed: 11 (0 ULiège)
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See detailA combined hydrochemical, isotopic and multivariate statistics approach for pollutant source identification in a regional aquifer
Gesels, Julie ULiege; Joniau, Claire; Knöller, Kay et al

Conference (2013, April 23)

In an urban and industrial context, a detailed hydrogeochemical characterization of groundwater has been performed in an alluvial aquifer, with the aim of determining the origin of the inorganic ... [more ▼]

In an urban and industrial context, a detailed hydrogeochemical characterization of groundwater has been performed in an alluvial aquifer, with the aim of determining the origin of the inorganic contaminations and the main processes involved that contribute to a poor groundwater quality. [less ▲]

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See detailIN-VITRO EVALUATION OF A-5021 ANTI-VIRAL ACTIVITY AGAINST TESTUDINID HERPESVIRUS 3 AND INITIAL PHARMACOKINETIC STUDY IN HERMANN'S TORTOISE (Testudo hermanni)
Gandar, Frederic ULiege; Vrancken, Robert; Diez, Marianne ULiege et al

Conference (2013, April 23)

Testudinid herpesvirus infections in tortoises belonging to the Testudinidae family are well known for decades, but their pathogenesis remains poorly understood and treatments are often empirical. This ... [more ▼]

Testudinid herpesvirus infections in tortoises belonging to the Testudinidae family are well known for decades, but their pathogenesis remains poorly understood and treatments are often empirical. This study describes the in vitro evaluation of selected anti-herpesvirus compounds against Testudinid Herpesvirus 3 (THV-3). A-5021, a compound with known broad-spectrum anti-herpetic activity, showed to be 9 times more potent than acyclovir, with an EC50 of 13.2 µM and inducing a complete inhibition of viral replication at 37.7 µM. Initial pharmacokinetic parameters were determined after a single sub-cutaneous administration of 5 and 10 mg/kg in Hermann’s tortoises (Testudo hermanni, n=3). Blood samples were collected at different time points and plasma concentrations of A-5021 were determined. No adverse effects were clinically observed and plasma concentrations remained above the EC50 for 2.8 and 4.2 h after administration of 5 and 10 mg/kg, respectively. These preliminary data provide a basis for further proof-of-concept studies for a potential prophylactic or therapeutic treatment of THV-3 infection in tortoises [less ▲]

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See detailEvolution de la répartition de la loutre d'Europe (Lutra lutra) au Maroc
Libois, Roland ULiege; Rosoux, René; Fareh, Mostafa

Conference (2013, April 22)

Detailed reference viewed: 44 (2 ULiège)
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See detailHacia una caracterizaciòn de los òxidos de hierro empleados durante el periodo Arcaico en la Costa Arreica del Norte de Chile
Salomon, Hélène ULiege; Coquinot, Yvan; Figueroa, Valentina et al

Conference (2013, April 22)

Los óxidos de hierro han sido intensamente utilizados por los grupos de cazadores recolectores de la Prehistoria desde hace 300 ka. Sin embargo, poco conocidas son las modalidades de extracción. La mina ... [more ▼]

Los óxidos de hierro han sido intensamente utilizados por los grupos de cazadores recolectores de la Prehistoria desde hace 300 ka. Sin embargo, poco conocidas son las modalidades de extracción. La mina de San Ramón15 (Taltal, región de Antofagasta) situada en la costa norte de Chile,representa una evidencia excepcional de la extracción de óxidos de hierro por grupos de pescadores-cazadores-recolectores. Dos fases de extracción han sido determinadas: La primera durante latransiciónPleistoceno-Holoceno (12000-10k BP) y la segunda haciael 4300 BP. Una alta cantidad de percutores y martillos líticosfueron encontrados en el desmonte de extracción. En la mina de San Ramón 15 las rocas ricas en óxidos de hierro se presentan bajo la forma de un filón lenticular de varios metrosintrusivo en granodioritas del Jurasico. El filón, de color negro y extremamente duro, está compuesto principalmente de magnetita y goethita.Una parte del filónfue explotada. Actualmente nuestra investigación se orienta a determinar cuales fueron las características de los óxidos de hierro explotadosy las fases posteriores de su transformación y uso. Para responder a estas preguntas, se desarrolló un protocolo de muestreo y análisis específico. En primer lugar, ha sido fundamental conocer la litología de los filones y de otras formaciones geológicas circundantes ricas en óxidos de hierro. Asimismo, se muestrearon restos de óxidos de hierro tanto en la mina como en los sitios habitacionales del área (conchales) para ser comparados. Los óxidos de hierro (geológicos, arqueológicos, residuos en los objetos) fueron analizados a partir de técnicasfísico-químicas(MEB-EDS, XRD, PIXE) y de caracterización petrográfica. [less ▲]

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See detailCoupling heat and salt tracer experiment for the estimation of heat transfer and solute transport parameters
Wildemeersch, Samuel ULiege; Jamin, Pierre ULiege; Orban, Philippe ULiege et al

Conference (2013, April 22)

Geothermal energy is a promising source of energy in the context of sustainable development. Therefore, very low enthalpy geothermal systems (open or closed) are increasingly considered for heating or ... [more ▼]

Geothermal energy is a promising source of energy in the context of sustainable development. Therefore, very low enthalpy geothermal systems (open or closed) are increasingly considered for heating or cooling houses and offices using groundwater energy. However, prior to the development of such systems, a feasibility study and an impact study of the system on groundwater ressources are required. Thereliability of such studies is highly dependent on the quality of the estimation of heat transfer parameters. This highlights the necessity of estimating properly such parameters. The objective of this study is to combine the use of heat and salt tracers to estimate simultaneously heat transfer and solute transport parameters in an alluvial aquifer. Additionally, coupling heat and salt tracing experiments is particularly useful for comparing heat transfer and solute transport processes occurring in the subsurface. An experimental field site, located near Liege (Belgium), is equipped with 21 piezometers drilled in the alluvial deposits of the Meuse River. These alluvial deposits are composed of a loess layer (3 m) overlying a sand and gravel layer which constitutes the alluvial aquifer (7 m). The coupled tracing experiment consists in injecting simultaneously heated water and salt in a piezometer and monitoring the evolution of groundwater temperature and salt concentration in a series of control panels set perpendicularly to groundwater flow. This coupled tracing experiment is then simulated using a numerical model. The estimation of heat transfer and solute transport parameters is obtained by calibrating this numerical model using inversion tools. The present study proposes a methodology coupling heat and salt tracing experiment for estimating heat transfer parameters at the field scale. Furthermore, this coupled tracing experiment shows that the comportment of heat and solute in the subsurface presents key differences. [less ▲]

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See detailL’ontologie politique de Sein und Zeit et le destin de la technique
Zincq, Aurélien ULiege

Conference (2013, April 22)

Detailed reference viewed: 41 (3 ULiège)
See detailLa crise permanente de la modernité. Exposé introductif
Steinmetz, Rudy ULiege

Conference (2013, April 22)

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See detailObservation des acteurs et de la dialectique comme marqueurs du genre dans la pratique scientifique
Sturnack, Lionel ULiege

Conference (2013, April 20)

Avec ce travail, nous proposons de porter une réflexion sémiotique sur le genre dans le domaine de la médecine clinique.

Detailed reference viewed: 31 (2 ULiège)
See detailDe Gaulle vu par l'ambassade belge en Allemagne
Brüll, Christoph ULiege

Conference (2013, April 20)

Detailed reference viewed: 35 (2 ULiège)
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See detaill'huile végétale sous la loupe
Danthine, Sabine ULiege

Conference (2013, April 20)

Detailed reference viewed: 29 (6 ULiège)
See detailLe plus gaullien des Belges ? Marcel-Henri Jaspar face au général De Gaulle (1940-1966)
Genin, Vincent ULiege

Conference (2013, April 20)

Detailed reference viewed: 48 (6 ULiège)
See detailMilitants wallons et milieux gaullistes durant les années 1960
Lanneau, Catherine ULiege

Conference (2013, April 20)

Detailed reference viewed: 19 (2 ULiège)
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See detailEnjeux autour des forêts congolaises
Vermeulen, Cédric ULiege

Conference (2013, April 19)

Detailed reference viewed: 27 (4 ULiège)
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See detailAutomatic target recognition with passive bistatic radars, with applications to the detection of anomalies in the civilian air traffic
Pisane, Jonathan ULiege; Azarian, Sylvain; Lesturgie, Marc et al

Conference (2013, April 19)

Detailed reference viewed: 51 (2 ULiège)
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See detailEcological wood anatomy of 155 African tropical hardwoods
Beeckman, Hans; Fayolle, Adeline ULiege; Doucet, Jean-Louis ULiege 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 detailWhen does the Market feel it? Magnitude, speed and persistence of market reactions to of cross-listings
Mouchette, Xavier ULiege; Biell, Elisabeth; Muller, Aline ULiege

Conference (2013, April 19)

Detailed reference viewed: 24 (9 ULiège)
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See detailNew issues for the Goodness-of-fit test of the error distribution : a comparison between Sinh-arcsinh and Generalized Hyperbolic distributions
Hambuckers, julien ULiege; Heuchenne, Cédric ULiege

Conference (2013, April 19)

In this article, we consider a multiplicative heteroskedastic structure of financial returns and propose a methodology to study the goodness-of-fit of the error distribution. We use non-conventional ... [more ▼]

In this article, we consider a multiplicative heteroskedastic structure of financial returns and propose a methodology to study the goodness-of-fit of the error distribution. We use non-conventional estimation and model selection procedures (Berk-Jones (1978) tests, Sarno and Valente (2004) hypothesis testing, Diks et al. (2011) weighting method), based on the local volatility estimator of Mercurio and Spokoiny (2004) and the bootstrap methodology to compare the fit performances of candidate density functions. In particular, we introduce the sinh-arcsinh distributions (Jones and Pewsey, 2009) and we show that this family of density functions provides better bootstrap IMSE and better weighted Kullback-Leibler distances. [less ▲]

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See detailDihydrogen Storage and distribution
Stevens, Frédéric ULiege

Conference (2013, April 19)

Detailed reference viewed: 5 (3 ULiège)
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See detailThe role of segmentation and investor recognition through the lens of cross‐listing activity
Mouchette, Xavier ULiege; Carrieri, Francesca; Muller, Aline ULiege

Conference (2013, April 19)

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See detailHiérarchisation énonciative, prismes génériques et effet de politisation
Provenzano, François ULiege; Goin, Emilie ULiege

Conference (2013, April 19)

Cette présentation aborde la question des genres et de leurs effets interprétatifs par le biais de l’énonciation et, plus particulièrement, par le biais des jeux de hiérarchisation énonciative dont ... [more ▼]

Cette présentation aborde la question des genres et de leurs effets interprétatifs par le biais de l’énonciation et, plus particulièrement, par le biais des jeux de hiérarchisation énonciative dont peuvent faire l’objet divers genres de discours. Nous avons choisi de contraster deux genres de discours a priori très différents (discours politique et littéraire) de manière à dépasser la conception du genre comme un ensemble de données situationnelles ou textuelles, pour y voir un double principe de transfert entre ces deux ensembles. Entre la situation et le texte, le genre (roman, témoignage, harangue, etc.) impose certaines routines communicationnelles ; entre le texte et la situation, c’est d’une autre définition du genre dont on a besoin, celle du genre comme activation d’un parcours au sein d’un espace de possibles interprétatifs, donnant ainsi au texte une orientation argumentative, une consistance évènementielle et une valeur d’acte performatif. Nous pensons que dans cette seconde acception, le genre – ici, l’effet politisant – est susceptible de généralisation, tout comme le sont les genres envisagés plus traditionnellement à partir du pôle de la production. [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 ULiege

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 detailA closer eye on hedge funds' dynamic hedging
Babaei, Hamid; Muller, Aline ULiege; Lambert, Marie ULiege

Conference (2013, April 18)

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

Conference (2013, April 18)

Detailed reference viewed: 27 (9 ULiège)
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See detailNew perspectives in the study of impiety: escaping from the letter of the law
Delli Pizzi, Aurian ULiege

Conference (2013, April 17)

Detailed reference viewed: 29 (5 ULiège)
See detailBoucles. Du minimalisme à l’indie rock
Levaux, Christophe ULiege

Conference (2013, April 17)

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

Conference (2013, April 16)

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

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 ULiege; 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 ULiege; 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 ULiege; Mahy, Grégory ULiege; 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 ▲]

Detailed reference viewed: 95 (31 ULiège)
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See detailAddressing the failure of National Innovation Systems in Latin America
Delvenne, Pierre ULiege; Thoreau, François ULiege

Conference (2013, April 12)

Detailed reference viewed: 32 (0 ULiège)
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See detail"Ceci n'est pas une migraine." Cas cliniques de céphalées de diagnostic difficile.
MAGIS, Delphine ULiege

Conference (2013, April 11)

Detailed reference viewed: 39 (6 ULiège)
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See detailPhoton correlation spectroscopy for molecular self-assembly investigations
Razafindralambo, Hary ULiege

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 ULiege

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 ULiege; Alabi, Taofic; Francis, Frédéric ULiege et al

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. <br />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. <br />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 ULiege; 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 detailCooking and eating in the name of Allah. Food practices among Moroccan women in Milan.
Mescoli, Elsa ULiege

Conference (2013, April 10)

A large body of literature currently exists regarding the relationship between food and Islamic religion in contemporary world. Works mostly address dietary prescriptions, often using a comparative ... [more ▼]

A large body of literature currently exists regarding the relationship between food and Islamic religion in contemporary world. Works mostly address dietary prescriptions, often using a comparative approach, and the way in which people negotiate with them in the global era. Besides this, a little prominence is given to the role of Islamic religion into the very same culinary practices exerted daily. Based on ethnographic experience, my article aims at highlighting this role, exploring the everyday lives of Moroccan Muslim women living in Milan hinterland. The assumption of my ongoing doctoral research in anthropology, from which this paper stems, consists of the adherence to a praxeological approach to subjectivation (Warnier 2001): it focuses on the construction of human selves through material culture. As a matter of fact, observing Moroccan women living in context of migration, I studied how they shape themselves trough daily micro-practices (De Certeau 1980). In particular, while cooking these women revealed me, inter alia, how complex is the interaction between food and Islamic religion; interaction which cannot be reduced to dietary prescriptions since it also involves the ways in which dished are prepared, served and consumed. In my paper I will try to explain such complexity through ethnographic examples. Furthermore, I will attempt to show how, in the context under analysis, the public performing of food practices and related objects is functional to the declaration of a shared religious identity in “acceptable” (since artistic) terms. Visual materials (photos and videos) will support such attempts. De Certeau, Michel. L’invention du quotidien. Tome I. Arts de faire. Gallimard, Paris 1980 Warnier Jean-Pierre. A praxeological approach to subjectivation in a material world, in Journal of Material Culture, Vol. 6(1): 5–24, 2001 [less ▲]

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See detailOn women’s bodies. Religion and female circumcision in Egypt
Mescoli, Elsa ULiege

Conference (2013, April 10)

Among discourses about female circumcision, frequent are those which attribute it to religious beliefs, in particular Islamic ones. An ethnographic research conducted in Egypt, lead me to deconstruct such ... [more ▼]

Among discourses about female circumcision, frequent are those which attribute it to religious beliefs, in particular Islamic ones. An ethnographic research conducted in Egypt, lead me to deconstruct such simplistic association, in order to explore how we can (and if is it possible to) consider such a practice as a performing of religion on women’s bodies. In fact, in the context considered, first of all not only the Islamic religion is called into question, but also the Christian one; secondly, social dynamics are deeply intertwined with spiritual beliefs. In this framework, female circumcision has a precise role in the definition of the healthy sexuality of the couple and in the maintaining of the very same social order insofar it reflects a cosmic one. As a matter of fact, on the one hand religion is functional to legitimize a practice exerted upon women’s bodies which is perceived as essential to regulate social interactions, in the domestic context as well as in the public space. On the other hand, discourses and acts promoting and abandonment of female circumcision rely they themselves on religious precepts. These complex dynamics need to be deeply explored, in order to produce a wider knowledge about a controversial practice. The aim of my paper is to give voice to the literature on the subject and to the social actors involved in my ethnographic experience, among which several women themselves, so as to highlight in which ways religion (Islamic and Christian ones) and the practice of female circumcision are connected. [less ▲]

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See detailMulti-decadal carbon and water relations of African tropical humid forests: a tree-ring stable isotope analysis
Hufkens, Koen; Helle, Gerd; de Haulleville, Thalès ULiege et al

Conference (2013, April 10)

Little is known about the temporal dynamics of the carbon sequestering capacity and dynamics of African tropical humid forest ecosystems in response to various environmental drivers. This lack of ... [more ▼]

Little is known about the temporal dynamics of the carbon sequestering capacity and dynamics of African tropical humid forest ecosystems in response to various environmental drivers. This lack of knowledge is mainly due to the absence of ecosystem scale flux measurements of gas exchange. However, tree growth often displays itself as alternating pattern of visible rings due to the seasonally varying growth speed of the vascular cambium. Consequently, analysis of tree growth through tree-ring analysis provides us with insights into past responses of the carbon sequestering capacity of key species to abrupt ecosystem disturbances and, while slower, a changing climate. Not only does the width and density of growth rings reflect annual growth but their isotopic composition of 13C/12C and 18O/16O isotopes also reveal the environmental conditions in which the trees were growing. In particular, stable isotope ratios in tree-rings of carbon are influenced by fractionation through carboxylation during photosynthesis and changes in leaf stomatal conductance. Similarly, fractionation of oxygen isotopes of soil water occurs at the leaf level through evapo-transipiration. As a consequence, 18O/16O (δ 18O) values in wood cores will reflect both the signal of the source water as well as that of for example summer humidity. Therefore, both C and O stable isotopes might not only be valuable as proxy data for past climatic conditions but they also serve as an important tool in understanding carbon and water relations within a tropical forest ecosystems. To this end we correlate long term climate records (1961 – present) with tree ring measurement of incremental growth and high resolution analysis of tree-core stable isotope composition(δ 13C , δ 18O) at a tropical humid forests in the DR Congo. The Yangambi Man And Biosphere (MAB) reserve is located in the north-eastern part of DR Congo, with a distinct tropical rainforest climate. In addition to the tree-core data records and extensive meteorological records collected at both sites, observations on green leaf phenology of key species will provide us with additional information on potential carbon sequestration dynamics. Because, phenology is a first order control on plant productivity. In this unique study, using detailed tree-ring analyses together with auxiliary data, we explore the temporal dynamics of carbon and water relations and the influence on carbon sequestration of key tree species in African tropical humid forests. [less ▲]

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

Conference (2013, April 09)

Detailed reference viewed: 13 (6 ULiège)
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See detailNanocarriers tailored for the delivery of proteinaceous drugs
Grandfils, Christian ULiege

Conference (2013, April 09)

Detailed reference viewed: 29 (1 ULiège)
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See detailOptimisation of degradable microcarriers for tissue engineering
Lombart, François ULiege; Sevrin, Chantal ULiege; Flebus, Luca ULiege et al

Conference (2013, April 09)

Detailed reference viewed: 25 (2 ULiège)
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See detailModélisation du transfert radiatif en forêts feuillues ardennaises : adaptation de la librairie Samsaralight
Ligot, Gauthier ULiege; Jonard, Mathieu; de Coligny, François et al

Conference (2013, April 08)

Detailed reference viewed: 31 (6 ULiège)
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See detailDenitrification, anammox and fixed nitrogen removal in the water column of a tropical great lake
Darchambeau, François ULiege; Roland, Fleur ULiege; Crowe, SA et al

Conference (2013, April 07)

Detailed reference viewed: 57 (8 ULiège)
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See detailTheodoricus Martinus Alostensis (ca. 1446-1532), Humanist Printer or Printer Humanist?
Adam, Renaud ULiege

Conference (2013, April 06)

Detailed reference viewed: 30 (1 ULiège)
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See detailJesuit solemnities in the Southern Netherlands: immersion and experience
Delfosse, Annick ULiege

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 ULiege; Trifkovic, Milana; Jérôme, Christine ULiege et al

Conference (2013, April 05)

Detailed reference viewed: 88 (7 ULiège)
See detailLa portée critique du concept de médiation
Servais, Christine ULiege

Conference (2013, April 05)

Detailed reference viewed: 14 (1 ULiège)
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See detailThe role of C and N dopants incorporation in phase change materials
Noé, Pierre; Raty, Jean-Yves ULiege; 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 detailLa stratégie africaine des émergents
Santander, Sébastian ULiege

Conference (2013, April 04)

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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 ULiege

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 detailLes relectures contemporaines de Frank Zappa
Delville, Michel ULiege

Conference (2013, April 04)

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See detailProbability perturbation method applied to the inversion of groundwater flow models using HydroGeoSphere
Hermans, Thomas ULiege; 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 detailUsing Brand constellation to segment the market: a goal systemic perspective
Brandt, Céline ULiege; 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 detailA MATHEMATICAL MODEL FOR CELL/MATRIX GROWTH ON 3D SURFACES USING THE LEVEL SET METHOD.
Guyot, Yann ULiege; Papantoniou, Ioannis; Chai, Yoke Chin et al

Conference (2013, April 03)

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See detailNovel methods for a specific identification of ruminant processed bones
Lecrenier, Marie-Caroline ULiege; Veys, Pascal; Berben, Gilbert et al

Conference (2013, April)

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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 ULiege; Bogaert, Jan ULiege; 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 detailLes empereurs julio-claudiens et les lettres grecques
Rochette, Bruno ULiege

Conference (2013, April)

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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 ULiege 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 detailAb Initio Molecular Dynamics Simulation of Liquid and Amorphous Te
Raty, Jean-Yves ULiege; 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 detailSelf-shuffling words
Charlier, Emilie ULiege

Conference (2013, April)

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