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See detailLa sensibilité à l'anxiété chez l'enfant dans une perspective de prévention
Stassart, Céline ULg; Etienne, Anne-Marie ULg

Conference (2011, January 12)

La sensibilité à l’anxiété (AS) est la peur des sensations corporelles liées à l’anxiété, qui proviendrait de croyances que ces sensations ont des conséquences somatiques, psychologiques ou sociales ... [more ▼]

La sensibilité à l’anxiété (AS) est la peur des sensations corporelles liées à l’anxiété, qui proviendrait de croyances que ces sensations ont des conséquences somatiques, psychologiques ou sociales néfastes. L’intérêt clinique de comprendre l’AS et ses facteurs déclenchant repose sur l’hypothèse que la sensibilité à l’anxiété joue un rôle central dans l’étiologie et le maintien de la peur et des troubles anxieux. Dans une perspective de prévention, il paraît donc pertinent de, premièrement, posséder un instrument fiable pour la mesurer, de deuxièmement se pencher davantage sur les facteurs de risque et de protection de l'AS et, troisièmement de mettre à disposition des intervenants cliniques une méthode d'action permettant de maintenir son intensité à un niveau constructif. Durant cette présentation et dans un premier temps vous seront présentées des analyses préliminaires de la version française du Childhood Anxiety Sensitivity Index (CASI) faites auprès d'une population d'enfants belges tout venants (n = 100). Dans un deuxième temps, nous prendrons le temps d'évoquer les différents facteurs qui différencient les enfants avec une AS haute et ceux avec une AS basse, comme par exemple les facteurs génétiques, interpersonnels (par ex. l'état émotionnel des parents) ou encore ceux environnementaux (par ex. les expériences d'apprentissage). Partant de là, nous aborderons plus précisément les aspects des expériences d'apprentissage (transmission d'information, renforcement, modeling) au sein du milieu familial, ainsi que des effets de genre et de rôles sociaux. Les différences qui pourraient exister entre les mères et les pères dans les mécanismes de transmission de l’AS seront également discutées. Ces différents aspects seront illustrés par des cas concrets. Ceci nous mènera aux différentes hypothèses de recherche qui ont émané de cette analyse et qui font actuellement l'objet d'un sujet de thèse de doctorat. [less ▲]

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See detailThe Increasing Threat of Natural Hazards in Central Africa: The Case of Urban Megagullies
Vandecasteele, Ine; Makanzu, Fils; Ntombi, Akheem et al

Conference (2011, January 11)

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See detailPar ma foi! Il y a plus de dix ans que je dis de la prose sans que j'en susse rien
Havelange, Carl ULg

Conference (2011, January 07)

Detailed reference viewed: 20 (6 ULg)
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See detailEmerging Hyphenated Analytical Techniques for POPs'
Focant, Jean-François ULg

Conference (2011, January)

Detailed reference viewed: 4 (0 ULg)
See detailConvergence analysis for a generalized-alpha Lie group time integrator
Arnold, Martin; Bruls, Olivier ULg; Cardona, Alberto

Conference (2011, January)

Detailed reference viewed: 11 (2 ULg)
See detailLa part des étudiants dans les dispositifs d’évaluation des enseignements et formations du supérieur
Detroz, Pascal ULg

Conference (2011, January)

Toutes les universités sont aujourd’hui confrontées à la nécessité de se positionner sur un marché de la formation de plus en plus concurrentiel. Améliorer la qualité des formations proposées pour les ... [more ▼]

Toutes les universités sont aujourd’hui confrontées à la nécessité de se positionner sur un marché de la formation de plus en plus concurrentiel. Améliorer la qualité des formations proposées pour les rendre plus attractives devient un objectif prioritaire. C’est dans ce contexte que les démarches d’évaluation de l’enseignement se développent progressivement depuis une dizaine d’années et parmi celles-ci l’évaluation de l’enseignement par les étudiants. Bien que ce type d’évaluation se soit heurté à des résistances liées au doute quant à la légitimité du point de vue des étudiants et quant à l’intrusion qu’elle représente dans les activités d’enseignement jusque là placées sous le signe de la liberté académique, elle se révèle désormais incontournable du fait de l’injonction institutionnelle liée au processus de Bologne. La France a certainement un retard dans ce domaine qui se comble. Les nombreuses recherches menées sur l’évaluation de l’enseignement par les étudiants dans les pays anglo-saxons montrent son utilité en termes de source d’information sur l’enseignement. Mais sa mise en place ne va pas de soi. Le risque est d’aboutir à une formalité de peu d’effets sur la qualité de l’enseignement ou d’en faire le seul outil d’évaluation. Une évaluation à visée de régulation des activités d’enseignement et de formation requiert un certain nombre de conditions aux niveaux institutionnels, collectifs et personnels des responsables, des enseignants et des étudiants en termes de connaissance, de reconnaissance, de réflexivité et d’engagements. La recherche met en évidence plusieurs tendances quant à l’évaluation des enseignements et formations dans le supérieur : - Le primat du quantitatif. Dans une société à la fois hyper bureaucratique et hyper compétitive, les systèmes de classement des établissements d’enseignement supérieur vont croissants. Ces systèmes de classement se fondent en particulier sur la mesure de résultats, que ce soit en termes de qualité du corps professoral en matière de recherche (classement de Shanghai, classement des laboratoires par l’AERES), de réussite professionnelle des étudiants (classement de l’École des mines) ou encore à partir d’autres critères tels que la satisfaction des étudiants, la notoriété des établissements, les compétences des étudiants etc. - La pression d’un contexte de contrôle. La volonté institutionnelle d’obtenir des indicateurs quantitatifs ainsi que la tentation de contrôler le système de formation se sont progressivement imposées. - L’absence de culture de l’évaluation formative aussi bien des responsables, des enseignants que des étudiants. La culture pédagogique dominante, individuelle et disciplinaire se révèle antagoniste à un engagement des acteurs dans un processus de réflexivité collective nécessaire pour l’évaluation formative. - L’impact des conditions de milieu et de sens. On peut souligner que l’intersubjectivité et le milieu spécifique apparaissent comme des éléments déterminants alors même qu’ils restent minorés dans la plupart des dispositifs d’évaluation actuels ; comme l’est également la part accordée à la signification des situations formatives au niveau individuel. Dans ce contexte, trois questionnements structureront plus particulièrement cette table ronde : 1. Quelle est la part de l’évaluation formative dans les dispositifs d’évaluation et quelles en sont les conditions ? 2. Comment s’articulent le quantitatif et le qualitatif ? 3. Comment sont pris en compte dans les modèles et les méthodologies les conditions de milieu et les points de vue singuliers ? [less ▲]

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See detailMechanism of amyloid fibril formation by human lysozyme and VHHs
Dumoulin, Mireille ULg; Chavignon, Chloé ULg

Conference (2011, January)

Detailed reference viewed: 25 (9 ULg)
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See detailacritarchs in Archean shallow-marine siliciclastic deposits
Javaux, Emmanuelle ULg

Conference (2011, January)

Detailed reference viewed: 54 (0 ULg)
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See detailLe "mode d'habiter": histoire d'une notion émergente en géographie
Schmitz, Serge ULg

Conference (2011, January)

L’expression « mode d’habiter » s’est inscrit dans la recherche géographique au cours des dernières décennies sans néanmoins sembler nécessiter une définition. Quand Nicole Mathieu signale que la notion ... [more ▼]

L’expression « mode d’habiter » s’est inscrit dans la recherche géographique au cours des dernières décennies sans néanmoins sembler nécessiter une définition. Quand Nicole Mathieu signale que la notion de « mode d’habiter » se trouve à mi-chemin entre la notion géographique de « genre de vie » et celle sociologique de « mode de vie », Mathis Stock insiste sur la pratique des lieux, et d’autres, dont Lévy et Lussault, renvoient à la spatialité des acteurs individuels. Néanmoins, au-delà des relations à l’environnement, le mode d’habiter ne devrait-il pas composer avec une relation aux lieux et à la communauté locale ? La communication proposera les résultats d’une analyse en cours qui cherche dans la littérature géographique la raison et l’origine de l’utilisation de cette expression. Une des hypothèses est que le mode d’habiter remplace le concept vidalien de « genre de vie » aujourd’hui désuet en raison notamment de la plus grande mobilité des populations et de la spécialisation des lieux et des temps. La notion de « mode d’habiter » intégrerait un ensemble de pratiques spatiales variables selon les auteurs intégrant ou non, en plus des pratiques spatiale liées à la résidence, les pratiques spatiales liées au travail, à la consommation, au loisir, au tourisme. La notion de « mode d’habiter » se différencierait également des notions voisines en articulant l’espace de vie, la mobilité, le sens des lieux et les relations sociales. Questionner l’apparition et l’utilisation de cette nouvelle expression va, bien entendu, au-delà du seul exercice de l’histoire de la géographie mais est également le reflet des préoccupations d’une époque avec ses difficultés pratiques et éthiques à classer l’espace en régions homogènes, recentrant l’appréhension de l’environnement aux travers des vécus des habitants et des significations données aux lieux. [less ▲]

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See detailApproche par compétences et contenus disciplinaires. Quelles articulations ?
Schneider-Gilot, Marguerite ULg; Mercier, Alain

Conference (2011, January)

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See detailData Mining in Ship Construction and operation
Caprace, Jean-David ULg

Conference (2011, January)

Detailed reference viewed: 37 (3 ULg)
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See detailLa vie littéraire par le kaléidoscope des Physiologies
Stienon, Valérie ULg

Conference (2011, January)

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See detailTable ronde
FINCK, Camille ULg

Conference (2011, January)

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See detailThe bioleaching as a recycling process of polymetallic wastes
Lambert, Fanny ULg

Conference (2011, January)

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See detailModernization of animal products consumption in Hanoi, Northern Vietnam
Vu Dinh, Ton; Phan Dang, Thang; Do Duc, Luc et al

Conference (2011)

Global food crisis has played its negative effects on sustainable development. A question has been raised: how could the families in both rural and urban areas struggle against this present global food ... [more ▼]

Global food crisis has played its negative effects on sustainable development. A question has been raised: how could the families in both rural and urban areas struggle against this present global food crisis? This research aims at documenting household food consumption from January to October 2010 by interviewing with and operating a record keeping system of food consumption in 250 households of various income levels living in two different areas of Hanoi, the inner and suburban districts. There is variety of animal products consumed in each family of both areas. Indeed, pork meat, broiler chickens and freshwater fish were popularly used in all families; and broiler ducks are usually consumed in summer season. Furthermore, in the inner districts, there is a rise in the demand of red meats and aquatic products, particularly beef and seafood products. Home-made foods are still a major source of foods for all family members of most of families, however, families in urban areas tends to have breakfasts and lunches in restaurants. In rural areas, the soya curd (tofu) and self-made products from broiler chickens, vegetables, and the rice play an important role, occupying from 15% to 30% of food expenditures. In addition, pork meat and freshwater fish are usually bought in village markets. Through incomes of 82% of households are mainly from agricultural production or from between agriculture and off-farm activities, thanks to self-made products in most of households, the rural areas are not considerably influent by the present global food and financial crisis. Nevertheless, in order to achieve sustainable development, it is necessary to equip farmers with sufficient knowledge of practical agricultural production. [less ▲]

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See detailEpidemiology of the metabolic syndrome in Luxembourg findings from ORISCAV-LUX study
Alkerwi, A; Sauvageot, N; Donneau, Anne-Françoise ULg et al

Conference (2011)

Detailed reference viewed: 38 (9 ULg)
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See detailPrevention of bacterial biofilms onto stainless steel substrates by immobilization of antimicrobial and anti-biofilm biomolecules
Vreuls, Christelle ULg; Zocchi, Germaine ULg; Faure, Emilie ULg et al

Conference (2011)

Stainless steel is widely used in the daily life in building and food industries as well as in the medical field. However, at long term, bacteria succeed in adhering, proliferating and forming a resistant ... [more ▼]

Stainless steel is widely used in the daily life in building and food industries as well as in the medical field. However, at long term, bacteria succeed in adhering, proliferating and forming a resistant biofilm on stainless steel. Therefore, surface modification is needed providing metal surface with antibacterial, anti-adhesion and easy cleaning properties. Several biomolecules (antimicrobial peptides, antiadhesion biomolecules and anti-biofilm enzymes) were immobilized on stainless steel thanks to different immobilization techniques. In a first approach, cationic peptides have been embedded in a LBL architecture comprising anti-adhesion biomolecules. In a second approach, small inorganic-binding peptides isolated by phage display technology and recognizing specifically the steel surface were used as linker for antimicrobial peptide immobilization. Finally, antibacterial peptides were covalently grafted onto an organic-polymeric interlayer deposited by plasma. Resulting antibacterial, antiadhesion and anti-biofilm properties were characterized and the advantages of each immobilization technique were documented. The biocidal effect of these surfaces was demonstrated against Gram+/- bacteria. Coated stainless steel surfaces led to 95% reduction of S. epidermidis adhesion vs bare substrate. By combining both antibacterial and anti-adhesion biomolecules, we produced stainless steel surfaces with better cleanability. A biofilm-releasing glycoside hydrolase was also immobilized on the surface and showed to confer anti-biofilm properties to stainless steel. Moreover, we provide valuable insight about the resistance of the coating to close to real life cleaning conditions. [less ▲]

Detailed reference viewed: 454 (7 ULg)
See detailComparative magnetotail flapping: Overview of observations at Earth, Jupiter and Saturn
Volwerk, M.; Andre, N.; Arridge, C. et al

Conference (2011)

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See detailThermo-hydro-mechanical simulation of a heating and hydration experimental study (the China-Mock-up) in GMZ bentonite
Chen, L.; Wang, J.; Liu, Y.M. et al

Conference (2011)

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See detailOn the periodontal ligament representation in orthodontic tooth movement modelisation
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

Conference (2011)

Orthodontic tooth movement (OTM) is the result of bone remodeling at the interface with the periodontal ligament (PDL) around a mechanically loaded tooth in response to a biomechanical stimulus. Modeling ... [more ▼]

Orthodontic tooth movement (OTM) is the result of bone remodeling at the interface with the periodontal ligament (PDL) around a mechanically loaded tooth in response to a biomechanical stimulus. Modeling of the PDL therefore plays an important role in the process of modeling OTM. However when producing a finite element model from clinical computer tomography data, the PDL cannot be segmented and its geometry is approximated by many authors from the root geometry. The aim of this study is to propose alternatives to a geometrical representation of the PDL using either simple spring elements between the teeth and alveolar bone or bilateral sticking contact conditions. Results consist in a comparison of the hydrostatic and Von-Mises stresses in the bone along the root as well as the strain energy used in a bone remodeling algorithm when a 1N force is applied to a single rooted tooth crown. While both models can well represent the pressure (hydrostatic stress) transfer from the tooth to the bone, the bilateral sticking contact conditions show better results to transfer the shear stress as well as the strain energy. [less ▲]

Detailed reference viewed: 71 (11 ULg)
See detailBestimmung von Koaleszenzvorgängen - von einzelnen Tropfen bis zur Apparatedimensionierung
Kopriwa, N; Liu, Y; Pfennig, Andreas ULg

Conference (2011)

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See detailNew insights on the role of root radial conductivity on the overall uptake dynamics
Lobet, Guillaume ULg; Javaux, M.; Couvreur, V. et al

Conference (2011)

Detailed reference viewed: 9 (1 ULg)
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See detailEnantioseparations in non-aqueous capillary electrophoresis (NACE)
Crommen, Jacques ULg; Rousseau, Anne; Fradi, Ines et al

Conference (2011)

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See detailRelationships between the structure of P-doped TiO2 xerogels and their photocatalytic properties
Bodson, Céline ULg; Cattoën, Xavier; Bied, Catherine et al

Conference (2011)

TiO2 heterogeneous photocatalysis has been the subject of numerous recent investigations as it is an attractive technique for the complete destruction of undesirable contaminants both in aqueous and ... [more ▼]

TiO2 heterogeneous photocatalysis has been the subject of numerous recent investigations as it is an attractive technique for the complete destruction of undesirable contaminants both in aqueous and gaseous phase by using solar or artificial light illumination. However, TiO2-based materials present a large band gap and therefore only a small fraction of solar light, in the UV region, can be utilized. Furthermore, anatase-TiO2 transforms to the rutile structure at temperatures relatively lower, which greatly reduces surface areas of the particles resulting in the decrease in photocatalytic ability of TiO2. To counter both disadvantages, several studies have been conducted by doping non-metallic elements, such as phosphor, into the Ti-O framework to form TiO2 solutions. In the present study, a sol-gel method is developed to synthesize P-doped TiO2 xerogels by a cogelation method based on the hydrolysis and the condensation of Ti(OC3H7)4 with functionalized P alkoxides: NH2-(CH2)2-NH-(CH2)2-P(O)-(OC2H5)2, or (C2H5O)2-P(O)-(CH2)7-CH3, in various alcohols. These xerogels are dried at 150°C under vacuum for 24 h, and calcined under air for 6 h at 350°C, 450°C, 550°C and 650°C. The resulting materials were characterized by TG-ATD, TEM, XRD, nitrogen adsorption-desorption isotherms, FT-IR and diffuse reflectance measurements in the UV/Vis region. It was found that the phosphor-doped species could significantly increase the surface area of the materials. Moreover, the phosphor-doping improved the thermal stability of titania and decreased the phase transformation of anatase to rutile. Diffuse reflectance measurements proved that the modification by phosphor shifted the absorption edge of titania to the visible region, making it an effective photocatalyst in visible light. This is shown by the degradation of p-nitrophenol under visible light irradiation. The excellent photocatalytic activity of P-doped TiO2 xerogels compared to pure TiO2 could be explained by its high surface area and small crystallite size. [less ▲]

Detailed reference viewed: 83 (5 ULg)
See detailCubeSat Activities at the University of Liège
Denis, Amandine ULg; Pisane, Jonathan ULg; Verly, Jacques ULg et al

Conference (2011)

Detailed reference viewed: 24 (6 ULg)
See detailThe role of galectin-9 splice variants in endothelial cells
Heusschen, Roy ULg; Griffioen, Arjan; Thijssen, Victor

Conference (2011)

Detailed reference viewed: 13 (5 ULg)
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See detailInorganic carbon in the Tana River Basin (Kenya): Distribution, composition and process rates
Van den Meersche, K.; Tamooh, F.; Meysman, F. et al

Conference (2011)

Detailed reference viewed: 11 (1 ULg)
See detailComa et état végétatif
Vanhaudenhuyse, Audrey ULg

Conference (2011)

Detailed reference viewed: 20 (2 ULg)
See detailHafting and its impact on projectile tecnology
Rots, Veerle ULg

Conference (2011)

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See detailCation partitioning between minerals of the triphylite ± graftonite ± sarcopside association in granitic pegmatites
Roda-Robles, Encarnacion ULg; Galliski, Migule; Nizamoff, Jim et al

Conference (2011)

Detailed reference viewed: 22 (0 ULg)
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See detailElectro-assisted assembly of Aliphatic Thiol, Dithiol and Dithiocarboxylic Acid Monolayers on Polycrystalline Copper Substrates
Maho, Anthony ULg; Denayer, Jessica; Delhalle, Joseph et al

Conference (2011)

Detailed reference viewed: 5 (0 ULg)
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See detailSecond harmonic generation as a tool to probe the interactions of peptides with membrane-mimicking interfacial monolayers
Benichou, Emmanuel; Duboisset, Julien; Matar, Gladys et al

Conference (2011)

Detailed reference viewed: 23 (2 ULg)
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See detailFinancial analysis of poultry commodity chains in Hanoi Suburb, North of Vietnam
Phan Dang, Thang; Vu Dinh, Ton; Dogot, Thomas ULg et al

Conference (2011)

Poultry production plays an important role in the structure of familial incomes in Vietnam but this activity is currently met with difficulties caused by the great influence of inputs/outputs on the ... [more ▼]

Poultry production plays an important role in the structure of familial incomes in Vietnam but this activity is currently met with difficulties caused by the great influence of inputs/outputs on the markets and the risks of epidemic diseases. This research was conducted for interviews and records according to book keeping among 280 poultry smallholders; 100 intermediary agents of poultry meat supply chains at the various scales of poultry supply chains and the diversification of poultry markets (poultry producers, private hatcheries, collectors of live poultry, slaughter houses and distributors of poultry meat) in Hanoi Suburb between 2009 and 2010. This research aimed at addressing to improving the income of small poultry producers and identifying the intermediary economic agents and its economic distributions. Furthermore, this research would like to solve restoring the poultry production and the various restraints faced of food contamination in poultry meat supply chains. Institutional organization and financial analysis approaches in different agents was used to calculate the value-added and to explain this problem in poultry meat commodity chains. Institutional organization of poultry meat supply chains is really complex with diverse economic agents. There are not many poultry meat products have a good traceability. These recent years, broiler industrial chickens and ducks met with some difficulties with the profits were very unstable or loss-making. But this industrial broiler chicken still occupies more and more an important role for the demand of domestic consumers. In addition, color broiler chickens were chosen for more satisfying the Vietnamese taste. In fact, local or color crossbred broiler chickens have a good economic performance but the output is still instable. Traders of live poultry and manual slaughter-house have a good economic performance caused by using the source of familial labor and selling directly to consumers. The systems of automatic skill of live poultry have still limited. The consumers do not be informed the useful information on food safety standards. [less ▲]

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See detailAvoiding congestion in freight transport planning: a case study in Flanders
Caris, An; Cools, Mario ULg; Debels, Dieter

Conference (2011)

A substantial increase in transport intensity for passenger and freight traffic has been observed during the last decades and research confirms that this trend will continue in the years to come. Economic ... [more ▼]

A substantial increase in transport intensity for passenger and freight traffic has been observed during the last decades and research confirms that this trend will continue in the years to come. Economic centres have turned into heavily congested areas. The freight transport sector incurs excessive waiting times on the road as well as at intermediate stops (e.g. sea terminals, loading or unloading points). This may cause economic losses and environmental damages. Waiting times may be avoided by taking into account congestion in freight transport planning. Vehicle routing problems arise when several pickup and delivery operations need to be performed, mainly by truck, over relatively short distances [1]. Congestion leads to uncertain travel times on links and uncertain waiting times at pickup or delivery locations. Peak hours may be avoided on congested road segments by changing the order in which customers are served. On the other hand, time slots at customer sites may be renegotiated, creating more flexibility to avoid congestion on the road and at customer stops. The objective of this paper is to estimate the benefits of taking congestion into account in transport planning and to quantify the impact of delivery restrictions on transport costs. A highly congested road network raises the need for robust vehicle routing decisions. Current traffic conditions give rise to uncertain travel times. The reliability of travel time on a route is one of the dominant factors affecting route and departure time choices in passenger transport [2]. Similarly, in freight transport the reliability of travel times may be taken into account when planning vehicle routes. In this paper congestion is modelled as time-dependent travel times. These travel times take into account the dynamics of the time lost due to congestion using the Bureau of Public Roads (BPR) function, which is commonly-used for relating travel times to increases in travel volume [3]. The Time Dependent Vehicle Routing Problem (TDVRP) will be studied as a deterministic planning problem taking into account peak hour traffic congestion. Solution methods for the TDVRP have been focused on heuristic approaches [4, 5, 6, 7]. Kok [8] applies a restricted dynamic programming heuristic to solve a TDVRP. In this paper a heuristic algorithm will be presented to solve problem instances of realistic size. Next, this algorithm will be applied to perform a sensitivity analysis to identify which congestion avoiding strategies have a large influence on the objective function. Shippers may adapt the way they plan their transport as a strategy to avoid congestion. For example, time windows at customer locations may be renegotiated, departure times at the depot may be questioned or the assignment of customers to routes and the order in which customers are served may be changed. The proposed methodology will be demonstrated with a Flemish case study. [less ▲]

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See detailThe Producerist Narrative in Right-wing Flanders
Jamin, Jérôme ULg

Conference (2011)

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See detailNew method for photovoltaic solar cell physical parameters extraction
Aazou, Safae ULg; Ibral, A.; Assaid, M. et al

Conference (2011)

Photovoltaic energy is one of the most important renewable energies. This type of energy, unlike other energy sources, is clean, safe, and abundant. The photovoltaic solar energy is based on the ... [more ▼]

Photovoltaic energy is one of the most important renewable energies. This type of energy, unlike other energy sources, is clean, safe, and abundant. The photovoltaic solar energy is based on the conversion of sunlight into direct current by solar cells. In order to increase the efficiency of the photovoltaic conversion and for a better understanding of the solar cell behavior, an accurate knowledge of the cell physical parameters is required. In this work, the solar cell is considered as a generator and the one-diode equivalent circuit is retained. This electronic circuit modeling the solar cell contains a diode with its reverse saturation current and its ideality factor, parasitic series and shunt resistances and a photocurrent generator. In this paper, a new physical parameters extraction method is presented, for the first time to our knowledge, which is based on the current-voltage characteristics and on the analytical expression of the output voltage given in term of the Lambert W function. This method gives all the physical parameters without any approximation or introduction of initial values. To test the efficiency of the presented method, a comparative study with other extraction methods is done. The obtained results are in good agreement. [less ▲]

Detailed reference viewed: 489 (69 ULg)
See detailHow to measure GFR in the year 2011?
DELANAYE, Pierre ULg

Conference (2011)

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See detailDépister au quotidien les indications pour les gestions d'alvéoles
LAMBERT, France ULg

Conference (2011)

Chacun d’entre nous est familier avec la résorption typique de la crête alvéolaire après l’extraction d’une dent. Cette perte de tissus, entraîne fréquemment la nécessité de reconstructions osseuse ... [more ▼]

Chacun d’entre nous est familier avec la résorption typique de la crête alvéolaire après l’extraction d’une dent. Cette perte de tissus, entraîne fréquemment la nécessité de reconstructions osseuse élaborées, si l’objectif est de restaurer la ou le- dents extraite(s) avec des implants dentaires. Cet exposé vise d’abord à évaluer le bénéfice et les indications des gestions des alvéoles d’extraction afin de limiter les pertes tissulaires post-extractionnelles. [less ▲]

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See detailNegations at Medinet Habu
Gillen, Todd Jonathan ULg

Conference (2011)

Detailed reference viewed: 13 (3 ULg)
See detailAdmittance spectroscopy study of NiGe contact on GeSn
Truong, Dao Y Nhi ULg; Vertruyen, Bénédicte ULg; Nguyen, Ngoc Duy ULg

Conference (2011)

The direct gap semiconductor germanium tin (GeSn) is an attractive material for next-generation devices in nanoelectronics as well as in photovoltaic applications. However, its detailed electronic ... [more ▼]

The direct gap semiconductor germanium tin (GeSn) is an attractive material for next-generation devices in nanoelectronics as well as in photovoltaic applications. However, its detailed electronic properties have not yet been clearly understood. Recently, admittance spectroscopy has become a popular analytical tool in materials research and development because it involves a relatively simple electrical measurement whose results may establish accurate characteristics of materials. The aim of this work is to study the effects of the annealing temperature on the electrical nature (rectifying or non-rectifying) of the metal contact by admittance spectroscopy. A numerical method, which is based on the solution of the basic semiconductor equations, is applied to simulate the material structure. From the calculation of microscopic quantities such as the modulated carrier concentrations and current densites, we can compute the theoretical admittance and impedance curves as function of frequency and external parameters (temperature and steady-state voltage) and then extract information on the electrical properties of the heterostructure. By a detailed investigation of the impact of microscopic parameters such as the dopant concentrations and the metal barrier height on the electrical characteristics, our objective is to understand the mechanisms of charge transport between the two electrodes. [less ▲]

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See detailIntroduction à la théorie de la transition
Stassart, Pierre M ULg

Conference (2011)

Introductive conference for the 20 years of l'APERe on the transition theory.

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See detailThe crystal chemistry of olivine-type phosphates
Hatert, Frédéric ULg; Ottolini, Luisa; Fontan, François et al

Conference (2011)

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See detailKarsts in silicated and non carbonated rocks
Willems, Luc ULg

Conference (2011)

Karsts in silicated and non carbonated rocks refer to morphologies similar to those found in limestones (caves, lapies, polje…) as being equally generated by predominantly dissolution processes. Their ... [more ▼]

Karsts in silicated and non carbonated rocks refer to morphologies similar to those found in limestones (caves, lapies, polje…) as being equally generated by predominantly dissolution processes. Their discovery in allegedly not very soluble rocks raises the question of existing water resources in lithologies which are rarely considered from this point of view. A rough inventory of this kind of karsts shows that they essentially develop in sandstones and quartzites. Other silicated lithologies such as granites or gneisses seem to contain only a few examples. Karsts in silicated and non carbonated rocks are found at all latitudes, though mainly in the warm and temperate climate zones of the world. Nevertheless, these conclusions may result from the lack of systematic prospecting in numerous regions of the world. Typically, most studied cavities are located in Paleozoic to Proterozoic rocks. Underground networks can stretch for several kilometers. Two types of cavities can be identified. The first one is characterized by cave entrances located in a cliff or in a raised hillside. These subhorizontal cavities end blind within the rock massif. No trace of fracturing authorizing mechanical erosion by flows, which would explain their genesis, was ever recorded. The second type of cavities is characterized by the presence of an underground stream which disappears in a siphon or in some impenetrable passages. In some cases, an important granular disintegration of the surrounding rock produces quantities of sand which seal large pre-existent voids. The latter were formed in different physico-chemical conditions than those present in the open air environment. An initial deep karstification is possible despite the surface environment. Secondary morphologies on the cave walls (alveoli, pillars of dissolution, passages with “key hole” section, ceiling bells …) enable us to partially reconstitute the genesis of these caves. It would start in a phreatic environment with the development of spots of dissolution along deep water circulations. Initially, independent cavities grow and interconnect to form embryonal karst networks. The incision of valleys and the weathering processes progressing from the surface can intersect these. Physical erosion then becomes more prominent than chemical erosion. The pre-existent forms, depending on their organization, can either be dismantled or contribute to the evolution of a complex karst network. A comprehensive study of karsts in silicated and non carbonated rocks is an opportunity to a better understanding of generally inaccessible deep karstification, including in the carbonated rocks. Moreover, the presence of these karsts and sometimes of underground rivers in regions hit by chronic droughts represents a potential of water resources disregarded today. [less ▲]

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See detailMicrobial Diversity and Processes in Lake Kivu (East Africa)
Llirós, M.; Darchambeau, François ULg; Garcia-Armisen, T. et al

Conference (2011)

Lake Kivu is a deep meromictic and oligotrophic tropical African lake with a permanent thermal- and haline stratification with huge accumulations of dissolved CO2 and CH4 (ca. 300 km3 and 60 km3 ... [more ▼]

Lake Kivu is a deep meromictic and oligotrophic tropical African lake with a permanent thermal- and haline stratification with huge accumulations of dissolved CO2 and CH4 (ca. 300 km3 and 60 km3, respectively) in the deep anoxic monimolimnion (from 60 o 480 m depth). Although there are a wealth of information on the ecology of small eukaryotes and their trophic role on Kivu, available information on prokaryotic planktonic assemblages is scarce. Molecular analysis of archaeal and bacterial communities showed a vertical segregation imposed by the permanent redoxcline. In relation to Bacteria, Actinobacteria, Betaproteobacteria, Green Sulfur Bacteria and Bacteroidetes were the most commonly retrieved groups. For Archaea, a marked dominance of Thaumarchaeota and Crenarchaeota (75% of all archaeal OTUs) over Euryarchaeota was observed. In the anoxic hypolimnion, Euryarchaoeta (Methanosarcinales and Methanocellales) lineages together with Miscellaneous Crenarchaeotic Group phylotypes were mainly recovered. In turn, Thaumarchaeota phylotypes were recovered in oxic and suboxic waters. CARDFISH analyses over the first 100 m revealed the dominance of Bacteria (51.4% – 95.7% of DAPI-stained cells), especially Actinobacteria (epilimnion), Betaproteobacteria (oxic-anoxic interface) and Bacteroidetes (upper hypolimnion), over Archaea (1.0% – 4.5%; maximum abundances at the oxic-anoxic interface). In turn, flow cytometry evidenced the dominance of HNA cells in the euphotic layer, whereas the proportion of LNA cells increased with depth. HNA and LNA populations were still observed in the anoxic hypolimnion suggesting facultative or strict anaerobic metabolisms. The detection of distinct depth maxima of nitrate, nitrite, archaeal amoA and Marine Thaumarchaeota 16S gene copy numbers together with regularly detection of deep maxima of 3H-Thymidine uptake, and the presence of low-light adapted GSB species point towards a strong link of N, C, and S cycles in the redoxcline of Lake Kivu. [less ▲]

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See detailHay transfer to restore rupestrian fields, physiognomy of Cerrado threatened by land-use changes
Le Stradic, Soizig ULg; Buisson, Elise; Fernandes, Geraldo Wilson

Conference (2011)

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See detailCatalytic conversion of lignin to low molecular weight compounds
Verziu, Marian; Richel, Aurore ULg; Filip, Petru et al

Conference (2011)

Nowadays lignocellulosic materials represent the higher renewable natural resource in the world. These materials consist of 34–50% cellulose, 19–34% hemicellulose and 11–30% lignin. Unlike cellulose ... [more ▼]

Nowadays lignocellulosic materials represent the higher renewable natural resource in the world. These materials consist of 34–50% cellulose, 19–34% hemicellulose and 11–30% lignin. Unlike cellulose, lignin is a three-dimensional aromatic polymer including three main phenylpropane units, namely p-coumaril, coniferyl and sinapyl alcohol which are linked by C-O-C or C-C bonds. To valorize this material it is necessary to achieve its depolymerization to monomers or dimers that typically results from the cleavage of β-O-4 linkages. Literature already reported several approaches to depolymerize lignin using both homogeneous and heterogeneous catalysts. Yuan et all have considered a homogeneous route in this scope using NaOH as catalyst. This solution is however by far non-green leading to no-recyclable wastes. Heterogeneous catalysts offer an alternative. The use of noble metals like Pt or Rh supported on carbon, at 473 K, under H2 pressure, was shown to yield over 50% in monomers and dimers . Cheaper metals as copper represent a more versatile route but the reported example uses high energetic supercritical conditions. The use of inexpensive metals such as Ni may offer another alternative. In this study we propose an inexpensive route presenting results obtained using as active species, nickel in different environments such as NiOx, (NiAl)Ox, (NiMgAl)Ox thus looking also for the effect of basicity in this reaction. These materials were prepared using specific protocols and characterized by several techniques like: XRD, DRIFT, BET, and TEM. The catalysts were tested in autoclave conditions at different temperature (423-473K) under H2 pressure. The lignin was extracted from Miscanthus plants into formic acid / acetic acid / water mixture. Since it is not soluble in water its solubilization was achieved in an [BMIM]OAc ionic liquid, selected from a screening of a series of ILs. On the other side, the analysis of the reaction products is a complicate issue in this chemistry. This was carried out with a chromatographic system equipped with a Detector Triple Quad LC/MS, and a MS Ion Source type, working simultaneously in both APCI and ESI modes. The analysis of the reaction products indicated both polar and less polar compounds with a m/z signal varying from 80 till 900. The population of the different class molecules was carefully analyzed as a function of the nature of the catalyst and the reaction conditions. The higher extent of lignin depolymerization was around 54% and was obtained using a (NiAl)Ox catalyst. Under these conditions the predominant class was that with m/z of 200-300 a.u. Finally the stability of the catalysts was checked looking for their separation and recyclability in several successive cycles. [less ▲]

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See detailProduction and processing of canna vermicelli in Hung Yen province toward sustainable development
Le Thi Long, Vy; Do Truong, Lam; Vu Dinh, Ton et al

Conference (2011)

Located in the Red River Delta region, Hung Yen province has 923000 ha of total land area, of which agricultural land area occupied 60.67%. The agricultural land area per labor is 0.1 ha. However, it has ... [more ▼]

Located in the Red River Delta region, Hung Yen province has 923000 ha of total land area, of which agricultural land area occupied 60.67%. The agricultural land area per labor is 0.1 ha. However, it has been annually decreasing due to the development of industrial zone, construction of urban zone, expansion of road… For these reasons, the stainable development for production and processing of agricultural products plays a very important role in job creation for farmers who loosed their own agricultural land, avoidance of quantity and quality loosing of raw agricultural products and increase in economic efficiency of agricultural production and processing. The production and processing of canna are traditional jobs of rural households in Hung Yen. They not only have been creating jobs for rural households but also increasing in their income. Beside the social and economic benefit created by these activities, the processing activity has caused many negative consequences. It led to environmental pollution due to its waste, overuse of chemical substances. Desiccated of vermicelli in bad condition resulted in the unsafe food. Therefore, this study is conducted to deeply investigate both positive effects and negative consequences created by production and processing of canna vermicelli in term of economic, social and environmental aspects. This study concentrates on the farm households; discuss advantages and disadvantages of production inputs, processing techniques and output market of their products from arrowroot to vermicelli; and find out solutions for the sustainable development for production and processing of vermicelli. [less ▲]

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See detailDiscovery and characterization of an ozone layer in Venus’atmosphere
Montmessin, F.; Bertaux, J.-L.; Lefèvre, F. et al

Conference (2011)

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See detailPeasant responses to agricultural land conversion and mechanism of rural social differentiation in Hung Yen province, Northern Vietnam
Nguyen Thi, Dien; Vu Dinh, Ton; Lebailly, Philippe ULg

Conference (2011)

Agricultural accumulation has been one of the main source determined the social differentiation in Vietnamese countryside. The complexities of agrarian changes under the post - socialist industrialization ... [more ▼]

Agricultural accumulation has been one of the main source determined the social differentiation in Vietnamese countryside. The complexities of agrarian changes under the post - socialist industrialization with high rate of agricultural land conversion in recent context reveal the new forms of capital accumulation and social differentiation. This research investigates how land conversion process to industrial zones and clusters affected to the way that different groups of peasant households accumulate their resources. The study was carried out in 3 districts of Hung Yen province from 2006 to 2010. The study results are as follows: first, the land conversion to industrialization has impact on not only the decline of household landholdings but also the changes value of land which are the sources of social conflicts and informal land transfer. Second, in the context of land conversion to industrialization with tiny plots of land, low return from agricultural production and more opportunities of non-farm activities, even when non-farm employment is very profitable, peasant households are not likely to give up their land but maintaining agricultural production for not only their basic and secure livelihood but also for their identity. Third, among the affected peasant groups, the households with non-farm background tend to be in better position in engaging to high - earning activities. They are likely the rich peasants in opposed to the poor group with farming background and lost more than 50% of their agricultural land. This research has showed that the industrialization policies have to deal with the proportion of agricultural land would be transferred for industrialization zones and other measures in order to limit the conflicts as well as the social differentiation in countryside. [less ▲]

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See detailEvolution of livelihood strategy and income of the households in the coastal sandy area of the Central region, Vietnam : the case of Thua Thien Hue Province during period 2003-2008
Nguyen Dang, Hao; Lebailly, Philippe ULg

Conference (2011)

Based on livelihood approach and using both livelihood strategy participatory assessment and household survey data this study mainly focus on assessment of evolution of livelihood strategy and income of ... [more ▼]

Based on livelihood approach and using both livelihood strategy participatory assessment and household survey data this study mainly focus on assessment of evolution of livelihood strategy and income of households in the Coastal Sandy Zone of Thua Thien Hue Province. Findings indicated that livelihood strategies are very dynamic and considerable difference between the wealth categories of households and among the study sites. Although agriculture –based strategy is one of the most popular among the livelihood strategies there are considerable changes. Thanks to more specialization on livestock - non-farm business – aquaculture the better-off category has increased rapidly their income during 2003-2008 period. By contrast, due to more dependence on food crop, wage work and migration, income of the poor slowly improved at the same period. These findings implicate that in the context of rural development, support policies introduced by government have positively influenced on household income, but these general policies cannot meet the development needs from various locations as well as different household categories because there is marked difference in livelihood assets, human source, landholding, financial and social capitals in particular. [less ▲]

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See detailIs brain activity during a Stroop inhibitory task modulated by the kind of cognitive control required?
Collette, Fabienne ULg; D'Ostilio, Kevin ULg; D'Argembeau, Arnaud ULg et al

Conference (2011)

Performance on the Stroop task is associated to a large antero-posterior cerebral network involving notably the anterior cingulate and dorsolateral prefrontal cortex. In this study, we used a mixed-BOLD ... [more ▼]

Performance on the Stroop task is associated to a large antero-posterior cerebral network involving notably the anterior cingulate and dorsolateral prefrontal cortex. In this study, we used a mixed-BOLD-fMRI design (N=25) to determine the neural substrates of inhibitory functioning in a Stroop task according to contextual information. Consequently, two task-contexts were created: (1) congruent context with a majority of facilitator items, (2) non-congruent context with mainly interfering items. Based on the dual cognitive control model, we postulated that the non-congruent blocks will involve proactive control, which is anticipatory, sustained, and involved when a large number of interfering items are successively presented. On the contrary, congruent blocks were assumed to involve reactive control, which occurs when few interfering items are presented, and just after the presentation of these items only. On this basis, we hypothesized that the kind of cognitive control modulates cerebral activity associated to inhibitory functioning. For behavioral data, we obtained faster response times for interfering items in the non-congruent vs. congruent condition, indicating proactive control specific to the congruent condition only. Functional neuro-imaging data showed an increased transient activity for interfering vs neutral items in a fronto-parietal network more important in the congruent than in the neutral condition. A similar contrast in the non-congruent condition showed no significant brain activity at the statistical threshold used. These data indicate the existence of a modulation of the cerebral areas associated to inhibitory functioning according to the kind of cognitive control necessary to perform the task. [less ▲]

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See detailSocial policy Challenges in Belgium
Jousten, Alain ULg

Conference (2011)

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See detailLa formalisation de la GRH dans une PME comme enjeu d’une certification RSE
El Abboubi, Manal; Cornet, Annie ULg

Conference (2011)

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See detailSuper-heated Steam Drying: an Innovation of Clean Coal Technology for Lignite-fired Power Plant
Li, Sheng; Jiang, Bing; Shi, Yongchun et al

Conference (2011)

A comprehensive overview of the status of lignite pre-drying technology is given in this study. The practical problems of high energy consumption, high investment and poor safety exist in the lignite ... [more ▼]

A comprehensive overview of the status of lignite pre-drying technology is given in this study. The practical problems of high energy consumption, high investment and poor safety exist in the lignite drying using the traditional thermal drying, for the reason that the super-heated steam drying technology for lignite is put forward. The mechanism experiment research and pilot-scale test research of the super-heated steam drying technology for lignite were carried out, and the results show that the drying efficiency of the super-heated steam is better than the hot air at given conditions, the lignite drying can be accomplished stably and continuously and the drying product can meet the requirement of the industrial application of the lignite fired power plant. A more innovative approach as a new lignite Super-heated steam low-rank Coal Upgrading (SCU) is proposed by Energy Conservation Research Center of Shandong Academy of Sciences. The technical advancement in terms of energy-saving and safety among the applied technogies are compared and analyzed, and the results show this techonogy has the advantages of low energy consumption, high safety and energy saving. To sum up, the exploitation of the super-heated steam drying technology for lignite fired power plant can promote the development of the energy and power industry, and the technology has wide application prospect. [less ▲]

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See detailOptimal multi-subject fMRI experiments
Maus, Bärbel ULg; van Breukelen, Gerard J P; Goebel, R et al

Conference (2011)

Functional magnetic resonance imaging is a neuroimaging method which is used to study the human brain and its functional areas. In multi-subject fMRI experiments, data from several subjects is collected ... [more ▼]

Functional magnetic resonance imaging is a neuroimaging method which is used to study the human brain and its functional areas. In multi-subject fMRI experiments, data from several subjects is collected while these subjects perform each the same task of interest, e.g., passive viewing of houses presented on a screen, in the scanner. In my talk optimal designs for multi-subject fMRI experiments with fixed experimental budget are considered. The optimal combination of number of subjects and fMRI scanner time/imaging time per subject will be studied. Analytical and numerical results based on a linear mixed effects model with uncorrelated and correlated errors will be presented for common parameters of fMRI experiments. It will be shown how the optimal number of subjects and optimal scanner [less ▲]

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See detailLes festivals et la transformation du champ théâtral en Belgique
Delhalle, Nancy ULg

Conference (2011)

Detailed reference viewed: 58 (12 ULg)