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See detailA capacity game in transportation planning
Amand, Guillaume ULg; Arda, Yasemin ULg

Conference (2010, January 28)

Emerging concerns about competitiveness induce a growing number of firms to outsource their outbound transportation operations to third-party logistics providers. The resulting increase in the number of ... [more ▼]

Emerging concerns about competitiveness induce a growing number of firms to outsource their outbound transportation operations to third-party logistics providers. The resulting increase in the number of actors often leads to sub-optimal supply chain actions due to the antagonistic nature of the economic objectives of the partners. With the aim of determining possible deviations from the optimal system performance in such supply chains, this study analyzes the contractual relation between a retailer and a third-party logistics provider (carrier) using game theoretical approaches. The partners of the studied supply chain play a Stackelberg game in which the retailer is the leader and the carrier is the follower. The retailer faces an uncertain demand and needs to supply his store from his warehouse. he has the option of not meeting all the demand but must satisfy at least a minimum proportion of the fi nall demand. On the other hand, the carrier has to determine the number of trucks needed to satisfy this demand before uncertainty is resolved. Once demand is realized, if the reserved transportation capacity is insufficient, the carrier also has the possibility to requisition trucks at a higher price. We modelise the problem and propose a contract having two parameters : the quantity of transported items and the number of truck used. In our settings, the retailer is the one that submits the contract and the carrier decides if he accepts it or not. We compare this situation with a centralized model where a single decision maker takes all the decisions. [less ▲]

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See detailUn portail cartographique pour un échantillonnage et un diagnostic agronomique personnalisés
Genot, Valérie ULg; Colinet, Gilles ULg; Buffet, Dominique et al

Conference (2010, January 27)

Detailed reference viewed: 49 (17 ULg)
Peer Reviewed
See detailInternational Foundation for Research in Paraplegia
Martin, Didier ULg

Conference (2010, January 26)

Detailed reference viewed: 7 (2 ULg)
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See detailLe syndrome cardio-rénal
Krzesinski, Jean-Marie ULg

Conference (2010, January 26)

L’insuffisance cardiaque (IC) et celle frappant les reins (IR) constituent deux pathologies au sommet d’un iceberg, cachant un grand nombre de candidats à ces complications redoutables. Souvent, trois ... [more ▼]

L’insuffisance cardiaque (IC) et celle frappant les reins (IR) constituent deux pathologies au sommet d’un iceberg, cachant un grand nombre de candidats à ces complications redoutables. Souvent, trois facteurs de risque sont retrouvés très précocement dans l’histoire de ces patients, à savoir l’hypertension artérielle, le diabète sucré et le vieillissement. [less ▲]

Detailed reference viewed: 237 (1 ULg)
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See detailStatistical analysis of chamber VOCs emission data
Romain, Anne-Claude ULg; Degrave, Christophe; Nicolas, Jacques ULg

Conference (2010, January 21)

Detailed reference viewed: 29 (14 ULg)
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See detailRelation between emission and olfactory tests
Degrave, Christophe; Romain, Anne-Claude ULg; Nicolas, Jacques ULg

Conference (2010, January 21)

At present, sensory evaluation is not yet integrated in all labels and standards. After comparison and interpretation of the weaknesses and the strengths of the several existing methods, a methodology has ... [more ▼]

At present, sensory evaluation is not yet integrated in all labels and standards. After comparison and interpretation of the weaknesses and the strengths of the several existing methods, a methodology has been elaborated. Previous experience in off-odour measurements for environmental field investigations help us to propose a methodology based on the assessment of odour intensity and hedonic tone. Various floor covering materials were tested in the lab with a self-made instrument. The sampling procedure is based on a "Field and Laboratory Emission Cell" (FLEC). The odour of the material is compared to a 8-level butanol intensity scale generated through a vaporization chamber and 8 stainless steel capillaries distributing the diluted n-butanol to 8 sniffing ports. First results shows generally a correlation between bad hedonic tone and odour intensity. On the contrary, there are no systematic relations between VOC levels and odour perception. The less odorous materials (PVC) are also the ones with the higher level of total VOC and the linoleum had a strong odour with a low level of total VOC. The explanation lies in the chemical family composition of the emission. The PVC emission contains mainly alkanes compounds (non odorous family) whereas the linoleum contains also odorous chemical families like carboxylic acids and aldehydes. [less ▲]

Detailed reference viewed: 71 (14 ULg)
See detailSurgical and Prosthodontic considerations for the Bone Level Implant
LAMBERT, France ULg

Conference (2010, January 21)

Detailed reference viewed: 4 (0 ULg)
See detailUn contexte normatif dans les Recherches philosophiques de Wittgenstein
Gauvry, Charlotte ULg

Conference (2010, January 16)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailFootball et tensions communautaires en Belgique
Fincoeur, Bertrand ULg

Conference (2010, January 15)

Detailed reference viewed: 9 (0 ULg)
See detailObject existence and presence a core issue in spatio-temporal modelling
Hallot, Pierre ULg

Conference (2010, January 14)

Detailed reference viewed: 38 (2 ULg)
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See detailImitation et prise de position. À propos de quelques collectifs fumistes
Saint-Amand, Denis ULg

Conference (2010, January 14)

Detailed reference viewed: 7 (1 ULg)
See detailThe ecology of Lake Kivu: a puzzle solved?
Darchambeau, François ULg; Sarmento, Hugo; Isumbisho, Mwapu et al

Conference (2010, January 14)

Detailed reference viewed: 6 (1 ULg)
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See detailTEST AND EVALUATION OF TWO PROCESS CONTROL STRATEGIES FOR ADAPTING DIRECT INJECTION PESTICIDE APPLICATION TO SMALL SCALE FARMS
El Aissaoui, Abdellah ULg; Lebeau, Frédéric ULg; Destain, Marie-France ULg et al

Conference (2010, January 13)

Small scale farmers, in developing and in some developed countries, are faced to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated ... [more ▼]

Small scale farmers, in developing and in some developed countries, are faced to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated sprayers. As an issue, a small direct injection system based on a five meter's parallel boom layout was designed to improve chemical application. The boom layout was optimised to obtain the same minimal lag time response for the ten nozzles. The dynamic of the system was modelled using SimulinkTM as first order model with delay. Two control strategies were implemented using PID feedback control loops to monitor tracer injection (fluorescing) proportionally to simulated forward speed (from 0.6 to 1.2 m/s) and to control the constant operating pressure (constant carrier flow strategy) or the variable operating pressure proportionally to the injected chemical amount (variable total flow strategy). Different forward speed changes were induced using steps up and down, ramps, sine waves and sweeps solicitations to evaluate the control feedback. The system stability was tested for its ability to maintain the expected concentration and application rate. The results show that the lag time remains less than 3 s (dead time < 2s , time constant < 1s) and the system keeps stable for the maximal speed variation and acceleration tested (∆V=200%, a= 0.48 m/s2) which induce less than 10% variation of application rate. [less ▲]

Detailed reference viewed: 93 (3 ULg)
See detailQuelle quantité minimale de tissu rénal nécessaire?
Krzesinski, Jean-Marie ULg

Conference (2010, January 11)

Detailed reference viewed: 2 (0 ULg)
See detailAnalysis of mortality and morbidity data
Brichant, Jean-François ULg

Conference (2010, January 08)

Detailed reference viewed: 4 (0 ULg)
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See detailLaboratoire et allergologie : nouvelles applications
Gadisseur, Romy ULg; Cavalier, Etienne ULg

Conference (2010, January 07)

Detailed reference viewed: 14 (0 ULg)
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See detailMulti-scale modelling of sediment transport
Dewals, Benjamin ULg

Conference (2010, January 07)

Detailed reference viewed: 23 (2 ULg)
See detailTélémédecine en Néphrologie
Krzesinski, Jean-Marie ULg

Conference (2010, January 05)

Detailed reference viewed: 12 (0 ULg)
See detailAuroral processes at the outer planets
Gérard, Jean-Claude ULg

Conference (2010, January 04)

The mean electron energy may be significantly different in different auroral zones. The Io tail CR is remarkably low in comparison with the high-latitude aurora and independent of its brightness (<E> ~ 50 ... [more ▼]

The mean electron energy may be significantly different in different auroral zones. The Io tail CR is remarkably low in comparison with the high-latitude aurora and independent of its brightness (<E> ~ 50 keV or less). This is consistent with a model where the tail corresponds to an upward field aligned current closing the magnetospheric circuit in Jupiter’s ionosphere. The CR in the main oval is associated with electron energies from ~50 to several 100 keV. It is statistically positively correlated with the intensity. Brightness increase in the main oval is accompanied by hardening of the electron energy spectrum. This result is consistent with acceleration by potential drops accompanying upward field-aligned currents which carry a nearly constant particle number flux. The electron mean energy is also variable in the polar spots but it is not correlated with the main oval brightness nor its own intensity, suggesting different, uncorrelated mechanisms. Polar brightenings (duration ~ 50-100 sec, rise time ~30 sec) have been observed. They are not necessarily associated with an increase of the mean electron energy. The mean electron energy can even decrease during the intensification. No correlation is observed between changes in main oval and high latitude (polar cap) features. [less ▲]

Detailed reference viewed: 16 (2 ULg)
See detailPenser le nationalisme
Nachi, Mohamed ULg

Conference (2010, January)

Le nationalisme arabe, ses origines, son développement et son déclin

Detailed reference viewed: 2 (1 ULg)
See detailLe developpement des methodes de lutte biologique en agriculture et horticulture
Jijakli, Haissam ULg

Conference (2010, January)

Detailed reference viewed: 20 (2 ULg)
See detailLa lutte biologique et les terrains de sport et des espaces verts
Jijakli, Haissam ULg

Conference (2010, January)

Detailed reference viewed: 11 (0 ULg)
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See detailWheat yield and PAI decreasing shape curve
Kouadio, Amani Louis ULg; Tychon, Bernard ULg

Conference (2010, January)

Estimation of cereal-crop production is considered as a priority in most crop research programmes due to the relevance of food grain to world agricultural production. Today, a large number of ... [more ▼]

Estimation of cereal-crop production is considered as a priority in most crop research programmes due to the relevance of food grain to world agricultural production. Today, a large number of agrometeorological models for crop yield assessment are available with various levels of complexity and empiricism. A preliminary study was performed with simulated data of wheat yield and LAI derived from the WOFOST/CGMS agrometeorological model. The main hypothesis underlying this study is that it’s possible to improve wheat yield estimates from metrics stretched from LAI decreasing curves. This preliminary study showed that wheat yield can be estimated by metrics stretched from simulated LAI curve-fitting done by a modified Gompertz function [G =A*exp (-exp(-k(t-m)))] and a logistic function [G = A / 1+exp(-k(t-m)); where G is the green LAI (gLAI), A the initial percentage of LAI, m the position of the inflexion point in the decreasing part of the LAI curve and k the relative senescence rate. In 2009 a large field campaign in the Grand-Duchy of Luxembourg and France was done to check the validity of such approach with field data. Hemispheric images were taken on 18 winter wheat fields during the crop cycle, preferentially from inflorescence emergence to maturity. The variable of interest, green PAI (Plant Area Index), was retrieved after analyses of images by the CAN-EYE software (v. 6.1). Data used as input to establish the model of wheat yield estimate are the value of observed PAImax, and metrics k and m, stretched from observed PAI curves fitted by Gompertz and logistic functions. The model obtained by multilinear regression with these variables reveals that wheat yield can be estimated, at the scale of the plot, with a r² ≈ 0.70 and a RMSE = 0.87 t/ha (RRMSE = 9%). The validation of such approach at the scale of an agricultural zone or region will be performed in the next step of our study, by using remote sensing data (air temperature, PAI or LAI) and phenology data as input. Such simple models may be considered as a first yield estimates that may be completed, if justified, by other agrometeorological models in order to provide a better integrated yield assessment. [less ▲]

Detailed reference viewed: 54 (9 ULg)
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See detailUn dispositif de légitimation paradoxale. Le cas des Physiologies
Stienon, Valérie ULg

Conference (2010, January)

Detailed reference viewed: 4 (0 ULg)
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See detailPolitique fiscale: Quelles perspectives?
Jousten, Alain ULg

Conference (2010, January)

Detailed reference viewed: 10 (7 ULg)
See detailVocal fold hypomobility after thyroidectomy: diagnostic and treatments
FINCK, Camille ULg

Conference (2010, January)

Detailed reference viewed: 2 (1 ULg)
Peer Reviewed
See detailTNFL–Induced p100 processing (TIPP) relies on the internalization of the cognate TNFR
Ganeff, Corinne; Galopin, Géraldine; Remouchamps, Caroline ULg et al

Conference (2010, January)

Detailed reference viewed: 9 (4 ULg)
See detailgender mainstreaming et approche intégrée selon les sexes
Cornet, Annie ULg

Conference (2010)

Detailed reference viewed: 19 (3 ULg)
See detailExtinction debt and colonization credit: When both phenomena are integrated
Piqueray, Julien ULg; Cristofoli, Sara; Bisteau, Emmanuelle et al

Conference (2010)

Calcareous grasslands are among the most species-rich ecosystems in temperate countries. These ecosystems suffered a high fragmentation process during the last century. Fragmentation can lead to the ... [more ▼]

Calcareous grasslands are among the most species-rich ecosystems in temperate countries. These ecosystems suffered a high fragmentation process during the last century. Fragmentation can lead to the creation of an extinction debt in remaining habitat patches. In our study site, it was shown in a previous study that Fragmented habitat patches (area loss since 1965 >80%) exhibited an extinction debt in comparison to Stable habitat patches (area loss since 1965 <80%). However, human activities also created new habitat patches in the landscape and provided therefore opportunities for calcareous grassland plant species to colonize new sites. They also provide opportunities for studying species colonization abilities in the context of habitat restoration. We analyzed species richness in these new patches in comparison to old patches in order to detect colonization credit. When taking as reference Fragmented patches (that exhibit an extinction debt) or all old patches (Fragmented and Stable), we concluded to the occurrence of a colonization credit in New patches. However, when the reference is Stable patches (the less likely to exhibit an extinction debt) alone, no colonization credit could be detected. Moreover, correspondence analysis revealed that New patches were similar to old patches in term of species composition. These results are encouraging for restoration programs. They also showed that the presence of an extinction debt in reference habitats can lead to mistaken conclusion in restoration monitoring. Extinction debt occurrence should be taken into account in the choice of reference habitats for evaluation of restoration success. [less ▲]

Detailed reference viewed: 71 (10 ULg)
See detailCordon sanitaire : de l'éthique et de la responsabilité
Jamin, Jérôme ULg

Conference (2010)

Detailed reference viewed: 32 (0 ULg)
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See detailOrganic farming in Wallonia : situation and perspectives
Burny, Philippe ULg

Conference (2010)

Detailed reference viewed: 7 (1 ULg)
Peer Reviewed
See detailQuelle psychologie scolaire en Belgique ?
Frenkel, Stéphanie ULg

Conference (2010)

Detailed reference viewed: 63 (17 ULg)
See detailNeurobiologie de la dépression
Scantamburlo, Gabrielle ULg

Conference (2010)

Detailed reference viewed: 50 (2 ULg)
See detailMorphemes in the mind: Are there graded effects of semantic similarity on morphological processing in children?
Deacon, Hélène; Downing, Jennifer; Gonnerman, Laura et al

Conference (2010)

Detailed reference viewed: 14 (0 ULg)
See detailSelective epitaxial growth of III-V semiconductor on large-area Si substrate for advanced logic CMOS technologies
Nguyen, Ngoc Duy ULg; Brammertz, Guy; Wang, Gang et al

Conference (2010)

The continued downscaling of the metal-oxide semiconductor (MOS) transistor for sub-22 nm logic circuits with boosted performance will require the introduction of new channel materials with carrier ... [more ▼]

The continued downscaling of the metal-oxide semiconductor (MOS) transistor for sub-22 nm logic circuits with boosted performance will require the introduction of new channel materials with carrier mobility higher than that of Si, such as Ge for pMOS. The use of III-V compounds for nMOS devices poses however additional challenges related to the hetero-epitaxial growth of a polar semiconductor on a non-polar surface. Furthermore, these high-mobility materials have to be fabricated on large-area Si substrates, in the perspective of application in a standard low-cost very-large-scale integration scheme. In this work, we report on the successful growth of GaAs on 200 mm Si wafers by means of metal-organic vapor deposition using a modified Crius Close-Coupled Showerhead system from AIXTRON AG. We used Si (100) wafers with off-axis orientation (6° miscut towards <111>) in order to avoid the formation of anti-phase domains which lead to Ga-Ga and As-As bonds at their boundaries that have strong detrimental effects on the electrical conduction. In our approach, based on Ge virtual substrates with low threading dislocation (TD) density, the lattice mismatch between Si and GaAs is accommodated and, thus, no additional TD is introduced in the deposited III-V film. Our results show that smooth GaAs layers can be epitaxially grown on large-area Si substrates with high wafer-scale thickness uniformity. The excellent quality of the deposited GaAs was confirmed by photoluminescence and electron microscopy. Our process also demonstrates very high selectivity on patterned wafers with SiO2 mask and enabled the fabrication of capacitor structures using an integration process flow very similar to standard high volume Si manufacturing lines. The capacitance-voltage characteristics were similar to the ones obtained on a bulk GaAs substrate, and showed extremely tight within-wafer and wafer-to-wafer distributions as is standard to Si manufacturing. [less ▲]

Detailed reference viewed: 114 (6 ULg)
See detailL’e-learning, un moyen pour retrouver l’enseignement à la Socrate ?
Baeyens, Jean-Pierre ULg; Rorive, Dominique ULg; Maron, Séverine ULg

Conference (2010)

Le Campus Virtuel en Gestion a été créé à l’initiative de professeurs de trois grandes Ecoles de gestion en Communauté Française de Belgique. Ils ont pris conscience qu’ils ne pouvaient pas aborder le e ... [more ▼]

Le Campus Virtuel en Gestion a été créé à l’initiative de professeurs de trois grandes Ecoles de gestion en Communauté Française de Belgique. Ils ont pris conscience qu’ils ne pouvaient pas aborder le e-learning seuls et se sont entourés d’une équipe technico-pédagogique. Cette équipe a organisé un accompagnement de chaque professeur. La méthode de travail mise en place se centre d'une part sur le professeur et d'autre part sur les apprenants. Le professeur est à la fois l’auteur, l’expert contenu, il fixe les objectifs du cours et la méthodologie est structurée en fonction de ses besoins. Par contre, ce qui est nouveau pour lui c’est l’approche e-learning, le fait que celle-ci doit apporter de la valeur ajoutée pédagogique, obligeant dès lors l’enseignant à procéder à un redécoupage de son cours et à concevoir de nouvelles activités d’apprentissage à distance et en présentiel. En acceptant d’entrer dans cette démarche, il s’engage à développer de nouvelles compétences et entre dans une réflexion pédagogique sur son métier d’enseignant. [less ▲]

Detailed reference viewed: 80 (3 ULg)
See detailSlide seminar: Recurrent nevus
QUATRESOOZ, Pascale ULg

Conference (2010)

Detailed reference viewed: 6 (0 ULg)
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See detailHow bright is the Io UV footprint?
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010)

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint ... [more ▼]

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint emissions in both hemispheres. Recent results showed that this footprint is formed of several spots and an extended tail. Each feature is suggested to correspond to a different step in the propagation of the perturbation and in the electron energization processes. The present study focuses on the variations of the spots' brightness at different timescales from minutes to years through the rotation period of Jupiter. It relies on FUV images acquired with the STIS and ACS instruments onboard the Hubble Space Telescope. Since the footprint is composed of several localized features, a good understanding of the emission region geometry is critical to derive the actual vertical brightness and thus the precipitated energy flux. We developed a 3D emission model in order to assess as precisely as possible the respective contribution of each individual feature and to correctly estimate the precipitating energy flux. As far as the brightness variations on timescales of minutes are concerned, we will present results from the high time resolution campaign executed during summer 2009. On timescale of several hours, we will show that the variation of the emitted power as a function of the location of Io in the plasma torus suggests that the Jovian surface magnetic field strength is an important controlling parameter. Finally, the measured precipitated power and particle fluxes will be discussed in comparison with recent simulations considering both Alfvén waves filamentation and electron acceleration when the Alfvén waves become inertial. [less ▲]

Detailed reference viewed: 20 (0 ULg)
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See detailProsodic marking of information status in Dutch and French as foreign languages. Production and perception
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2010)

Detailed reference viewed: 11 (0 ULg)
See detailMagnetic Susceptibility of Frasnian reefs and mounds from Eastern Belgium.
Demaude, Nicolas; Boulvain, Frédéric ULg; Cornet, Pierre et al

Conference (2010)

Detailed reference viewed: 18 (1 ULg)
See detailInternal energy content of ions in a travelling wave ion guide
Morsa, Denis ULg; Gabelica, Valérie ULg; Rosu, Frédéric ULg et al

Conference (2010)

Travelling wave ion guides (TWIGs) separate of ions according to their mobility and, at constant charge, according to their shape. The ion mobility separation itself should not modify the shape of the ... [more ▼]

Travelling wave ion guides (TWIGs) separate of ions according to their mobility and, at constant charge, according to their shape. The ion mobility separation itself should not modify the shape of the systems investigated. It was recently suggested by Shvartsburg et al. that the higher fields used in TWIGs than in traditional drift tubes would cause significant heating of the ions. We present a quantitative analysis of the amount of internal energy imparted to ions as they are separated in TWIGs. Benzylpyridinium ions were chosen as “thermometer” ions. Based on arrival time distributions, the fragment ion population is separated as a function of the place of formation: before, in, or after the TWIG. Fragmentation all along the TWIG was observed. The roles of the travelling wave’s voltage, speed, and of the gas nature and pressure will be discussed in detail as well of the consequences on instruments performances. [less ▲]

Detailed reference viewed: 24 (2 ULg)
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See detailPratiques nouvelles en conception industrielle: adaptation des acteurs, des objets médiateurs et des modalités de travail.
Elsen, Catherine ULg; Dawans, Arnaud ULg

Conference (2010)

Une intervention in situ de deux mois au sein d’une équipe de conception de produits industriels (designers, dessinateurs), construite sur les méthodologies et théories de l’approche ergonomique « ... [more ▼]

Une intervention in situ de deux mois au sein d’une équipe de conception de produits industriels (designers, dessinateurs), construite sur les méthodologies et théories de l’approche ergonomique « compréhensive », interroge les pratiques nouvelles de ces métiers depuis l’avènement de la CAO. Les « objets médiateurs » sont considérés selon leurs apports respectifs et complémentaires et non plus selon une approche dichotomique, et leur étude structure l’ensemble du recueil des données. Une méthodologie de traitement et d’analyse des informations récoltées est présentée (approche chronologique et analyses « verticales » sur base de lignes du temps). Celle-ci nous permet de tracer les nombreuses adaptations dont font preuve les acteurs tout au long de leur processus: adaptations de leurs outils et représentations, de leurs modalités de travail individuelles ou collaboratives, adaptations et développement de nouvelles compétences. [less ▲]

Detailed reference viewed: 84 (11 ULg)
See detailLe développement durable: un concept incontournable
Stassart, Pierre M ULg

Conference (2010)

Detailed reference viewed: 23 (2 ULg)
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See detailCarbon dioxide and methane dynamics in estuaries
Borges, Alberto ULg; Abril, G.

Conference (2010)

Detailed reference viewed: 10 (0 ULg)
Peer Reviewed
See detailDifferential roles of lipopeptides(LPs) in plant host defenses and pathogen suppression.
Ongena, Marc ULg; Henry, G.; Jourdan, E. et al

Conference (2010)

Detailed reference viewed: 9 (0 ULg)
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See detailEffects of Polychlorinated Biphenyls on Thyroid Hormone Physiology and Metabolism of European sea bass (Dicentrarchus labrax)
Schnitzler, Joseph ULg; Klaren, Peter; Celis, Niko et al

Conference (2010)

Studies in the laboratory have shown that a number of synthetic and natural chemicals can interfere with the endocrine system in fish. Among them, organic compounds such as pesticides and ... [more ▼]

Studies in the laboratory have shown that a number of synthetic and natural chemicals can interfere with the endocrine system in fish. Among them, organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters. Of particular interest are effects on thyroid function, but data on effects of PCB exposure on these hormones and related metabolism has been lacking. We propose here a thorough approach to assess effects of these compounds on the thyroid function of European sea bass (Dicentrarchus labrax). An experimental exposure of sea bass to commercial PCB mixtures has been designed to understand underlying toxicity mechanisms and effects on the thyroid system. After 120 days of exposure, muscular thyroid hormone concentrations and the main metabolic pathways for thyroid hormones (deiodination, glucuronidation and sulfatation) were assessed. Exposure to environmental relevant doses of PCB (from 0.3 to 0.9 ppm [7 ICES PCB]). alters hepatic T4 outer ring deiodinase and T4 sulfatation whereas T4 glucuronidation was not affected. Owing to the extensive autoregulatory feedback at both central and peripheral levels, the thyroid hormone concentrations were preserved despite the PCB induced changes in thyroid hormone dynamics. At 10 times higher concentrations (10 ppm [7 ICES PCB]). an important depression of muscular T3 and T4 levels could be observed which are apparently caused by other mechanisms than metabolic pathways. Further analysis is required to evaluate thyroid gland function and secretion. These results support the observations made in our field study in wild sea bass (Dicentrarchus labrax) from coastal regions near several important European rivers mouths. [less ▲]

Detailed reference viewed: 44 (5 ULg)
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See detailPolychlorinated Biphenyls affect Histological Appearance of European sea bass (Dicentrarchus labrax) Thyroids
Schnitzler, Joseph ULg; Klaren, Peter; Celis, Niko et al

Conference (2010)

Polychlorobiphenyls (PCBs) are well-described endocrine disrupters and of particular interest are effects on thyroid function. We propose here a thorough approach to assess effects of these compounds on ... [more ▼]

Polychlorobiphenyls (PCBs) are well-described endocrine disrupters and of particular interest are effects on thyroid function. We propose here a thorough approach to assess effects of these compounds on the thyroid function of European sea bass (Dicentrarchus labrax). An experimental exposure of sea bass to commercial PCB mixtures has been designed to understand underlying toxicity mechanisms and effects on the thyroid system. After 120 days of exposure histological appearance of thyroid tissue was assessed by light and electron microscopy. The follicle area, perimeter, diameter, length and with of every follicle cross section were interactively measured. The shape of the follicles was described with three dimensionless shape descriptors: roundness, form factor and aspect ratio. The histomorphometrical analysis showed a greater heterogeneity of thyroid follicle diameter and especially higher epithelial cell heights in sea bass exposed to environmental relevant doses of PCB (from 0.3 to 0.9 μg g-1 [7 ICES PCB]). Ultrastructural histological investigations showed that the epithelial cells surrounding the bigger follicles present an higher accumulation of colloid droplets. This was interpreted to be the result of increased stimulation of follicular cells. No differences in shape could be identified among the different treatment groups The size of the follicles and the form of the follicular cells gives an indication of the secretary activity of the gland. These observations support the hypothesis that the contamination of PCB mixtures can induce a hyperactivity of the thyroid tissue. These observations were confirmed by measurements of muscular thyroid hormone concentrations and activity thyroid hormone metabolism. [less ▲]

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See detailNiveau de contamination et spéciation des métaux lourds dans l'Oued Fès et l'Oued Sebou.
Bouezmarni, Mohamed ULg; Debbaut, Vincent ULg; Diouri, S. El Edrissi et al

Conference (2010)

Detailed reference viewed: 52 (7 ULg)
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See detailDE LA CULTURE ITINERANTE SUR BRULIS AUX JACHERES ENRICHIES PRODUCTRICES DE CHARBON DE BOIS, EN R. D. DU CONGO
Peltier, Régis; Bisiaux, Franck; Dubiez, Emilien et al

Conference (2010)

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of ... [more ▼]

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of degraded forest. Estimated fuelwood consumption is in the range of 3 to 6 million tones of fuelwood equivalent per year (representing 0.6 to 1.2 MT of charcoal per year if all the wood were charcoaled). The Mampu project was designed as the pilot phase of a reforestation project covering 100 000 hectares of sandy soil on the Bateke plateau and aiming to remedy wood and charcoal scarcities. Despite the conflicts, about 8000 hectares of Acacia auriculiformis were planted, mainly from 1987 to 1993. From about 1994, the Mampu plantation was divided into 25 hectare plots for 320 farming families. Cultivation mainly follows the agroforestry pattern based on improved fallows, which draws on traditional slash-and-burn farming. Total charcoal production from the plantation varies from 8 000 to 12 000 tonnes per year, in addition to 10 000 T/year of cassava, 1 200 T/year of maize and 6 T/year of honey. The success of the project is an incentive to apply the model to the savanna lands on the Bateke plateaus, taking traditional land rights into consideration and continuing activities to diversify and process production locally. This will help to cover a larger share of urban needs for renewable energy while also creating rural employment. However, other agroforestry systems deserve to be tested or developed for different ecological and social or economic conditions across the country, such as management of the natural regrowth of local multiple-use species as applied with the traditional system of fallow enrichment (Nkunku) in the Lower Congo. [less ▲]

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See detailProcess mineralogy and automated phase identification in mixed copper ores at Kansanshi (Zambia)
Kottgen; Bastin, David ULg; Dufrane, Florent et al

Conference (2010)

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See detailDe la "fabrication" à la perception d’une action publique : la lutte contre le travail des enfants au Burkina Faso
Wouango, Joséphine ULg

Conference (2010)

Ma communication présente deux parties de ma thèse. La première partie concerne l’analyse historique et thématique des réponses de différents acteurs à la lutte contre le travail des enfants au Burkina ... [more ▼]

Ma communication présente deux parties de ma thèse. La première partie concerne l’analyse historique et thématique des réponses de différents acteurs à la lutte contre le travail des enfants au Burkina Faso: les pouvoirs publics, les acteurs de la société civile, les partenaires techniques et financiers, les partenaires sociaux. La deuxième partie présente l’analyse des résultats des deux enquêtes ethnographiques auprès des enfants et jeunes travailleurs. En m’appuyant sur la théorie de l’acteur social et des bases théoriques du nouveau paradigme de la sociologie de l’enfance (James & Prout, 1990), je confronterai les attentes, les expériences individuelles et collectives des enfants travailleurs aux réponses politiques et associatives de lutte contre le travail des enfants au Burkina Faso. [less ▲]

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See detailDo faces capture attention in a bottom-up fashion? An eye-movement study
Devue, Christel ULg; Belopolsky, Artem; Theeuwes, Jan

Conference (2010)

Due to their high social and biological significance, faces should be able to capture attention in a bottom-up fashion. Accordingly, a recent visual search study showed that the presence of an upright ... [more ▼]

Due to their high social and biological significance, faces should be able to capture attention in a bottom-up fashion. Accordingly, a recent visual search study showed that the presence of an upright distractor face slows down the search for a butterfly target while the presence of a butterfly distractor does not affect the search for a target face (Langton et al., 2008). To further test whether upright faces automatically capture attention we recorded eye movements during a cued target search task. We show that when the search alternates between a face and a butterfly target (Experiment 1), faces are found faster and with less saccades than butterflies. The presence of the opposite distractor within the display (e.g. a face during a butterfly search) slows down the search but to a higher extent when the distractor is a face. Similarly, faces capture the eyes more frequently than butterflies. In a control experiment inverted face targets were also found more efficiently than inverted butterfly targets and captured the eyes more frequently than butterflies when presented as distractors (Experiment 2). However, when upright or inverted faces were always presented as irrelevant distractors (Experiment 3), we could not found any sign of disruption caused by their presence during a search for butterfly or flower targets. These results challenge the view that faces capture attention automatically. Rather, they suggest that faces only attract attention when their processing is relevant during the search task and that they can otherwise be ignored. [less ▲]

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See detailAppétence et adhérence des systèmes de réparation : importance de la préparation du support
Courard, Luc ULg

Conference (2010)

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ... [more ▼]

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ainsi que de l’environnement dans lequel le contact est créé. Elle s’exprime habituellement en termes de variations dimensionnelles, de perméabilité et de propriétés chimiques et électrochimiques. Ces propriétés sont évoquées ou développées pour chacun des matériaux mis en présence : rugosité, porosité, cohésion superficielle et eau interstitielle pour le béton ; retrait, fluage, rigidité, absorption capillaire pour les produits de réparation. Trois conditions fondamentales nécessaires et suffisantes au développement de l’adhérence en tant que signe de la compatibilité entre matériaux sont évoquées et illustrées pour le cas particulier de la préparation de surface : sablage, burinage, hydro démolition, marteau-piqueur, … ont un effet spécifique non seulement sur la rugosité, et donc l’accrochage mécanique du système de réparation, mais aussi sur la cohésion de la couche superficielle du béton [less ▲]

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See detailConvergent evolution for sound production with a putative slow muscle in a Perciform fish Glaucosoma buergeri (Glaucosomatidae)
Mok, Hin-Kiu; Tsai, Kai-En; Chiu, Pai-Ho et al

Conference (2010)

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See detailEnjeux fonciers et exploitation du bois-énergie en périphérie de Kinshasa, RDC
Vermeulen, Cédric ULg; Mutambwe, Shango; Dubiez, Emilien et al

Conference (2010)

L’identification des acteurs, des finages, des dynamiques sociales locales et du rapport à la terre et aux ressources naturelles constitue un préalable à toute intervention dans les zones péri-urbaines ... [more ▼]

L’identification des acteurs, des finages, des dynamiques sociales locales et du rapport à la terre et aux ressources naturelles constitue un préalable à toute intervention dans les zones péri-urbaines soumises à forte pression anthropique. En République Démocratique du Congo, la capitale Kinshasa, mégapole en pleine extension, engendre une pression considérable sur les ressources ligneuses dans les finages des villages situés dans sa grande périphérie. La présente communication décrit les rapports des acteurs aux espaces-ressources dans deux zones (Bas-Congo et plateau Bateke) situées en périphérie de cette ville, zones considérées comme des bassins d’approvisionnement en bois-énergie. Les deux sites différent en termes de pression foncière (très élevée dans le Bas-congo, centrée sur les forêts galerie sur les plateaux Bateke) mais présentent les mêmes faciès de surexploitation des ressources ligneuses. Dans les deux cas, la gestion locale, aux mains des chefs de villages ou des chefs de lignée, a failli. La volonté de reboisement est aussi grande au Bas-Congo qu’elle semble moins développée sur les plateaux. Dans les deux situations, la pratique du retour rapide sur la formation végétale (pour l’agriculture ou pour l’exploitation du charbon de bois) hypothèque la possibilité de régénération de la plupart des essences locales. [less ▲]

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See detailEffect of rosemary extract and related flavonoid carnosol on chondro-protection and on the bone-cartilage crosstalk
Horcajada, Marie-Noelle; Sanchez, Christelle ULg; Scalfo, Fanny et al

Conference (2010)

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See detailComment la confiance envers le supérieur hiérarchique influence la créativité et le voice des employés. Le rôle du sentiment de responsabilité.
De Zanet, Fabrice ULg

Conference (2010)

Les entreprises attendent de plus en plus de leurs employés qu’ils soient proactifs et prennent des initiatives. Or, un employé qui est proactif prend un risque, car son initiative peut être perçue ... [more ▼]

Les entreprises attendent de plus en plus de leurs employés qu’ils soient proactifs et prennent des initiatives. Or, un employé qui est proactif prend un risque, car son initiative peut être perçue négativement par la hiérarchie. Detert et Burris (2007) postulent ainsi que la décision d’être proactif résulte d’un calcul coûts-bénéfices. Par ailleurs, un employé est d’autant plus enclin à prendre des risques qu’il fait confiance à son supérieur hiérarchique (Mayer, Davis, & Schoorman, 1995). En conséquence, la confiance des employés envers leur supérieur hiérarchique est certainement un facteur clé dans l’adoption par les employés de comportements proactifs. Néanmoins, il reste encore à comprendre le mécanisme à travers lequel la confiance envers le supérieur hiérarchique influence la proactivité des employés. L’objectif de cet article est de montrer comment la confiance des employés envers le supérieur hiérarchique influence - via le sentiment de responsabilité des employés - l’adoption de deux comportements proactifs, à savoir la créativité, c'est-à-dire le fait de proposer des idées innovantes et utiles, et le voice, c'est-à-dire le fait de faire remonter des informations potentiellement critiques à propos du fonctionnement de l’organisation. Les analyses réalisées sur 111 paires employés-supérieurs montrent que la confiance envers le supérieur hiérarchique agit sur le niveau créativité et de voice des employés et que cette influence est médiée par le fait que ces derniers se sentent davantage responsables d’apporter des changements constructifs dans leur travail. [less ▲]

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See detailVanadium oxide-based mesoporous films as positive electrode material in Li-ion batteries
Krins, Natacha ULg; Caes, Sébastien ULg; Arrebola, José-Carlos et al

Conference (2010)

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See detailStrengthening local innovations in rice processing through video in Benin
Zossou, Espérance; Van Mele, P.; Vodouhe, D. S. et al

Conference (2010)

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before ... [more ▼]

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before milling. Parboiling is a transformation process that enhances the quality of rice. This important income generating activity is exclusively done by women from rice producing communities. In Benin, the traditional parboiling method is still prevailing and does not lead to quality rice. To address this, an improved rice parboiling technology was developed. AfricaRice subsequently developed a video where rural women explain how to use this improved technology. Four NGOs in central Benin publicly screened the video in 80 villages. After women watched the video, they started using the improved parboiler equipment individually or collectively. Women who didn’t have the financial support to buy the improved equipment understood its principle and developed creative solutions based on the idea of pre-cooking paddy with steam. Video watching also made women pay attention to reducing the loss of steam and to use local resources innovatively to conserve energy. Women also improved the quality of their parboiled rice by removing dirt, properly washing rice and drying rice on tarpaulins. On the other hand, in the north and south of Benin where there were no public video screenings, the traditional rice parboiling method is still predominant. This study shows the potential of farmer-to-farmer video to improve farmers’ practices and their attitudes to work collectively in agro-processing and marketing. [less ▲]

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See detailFocus on the epidemiology of metabolic syndrome in Luxembourg. Data from ORISCAV-LUX study
Alkerwi, A; Lair, ML; Guillaume, Michèle ULg

Conference (2010)

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See detailIs left ventricular longitudinal function related to metabolic abnormalities and fat distribution?
Laret, V; Magne, Julien ULg; O'Connor, K et al

Conference (2010)

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