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See detailAnesthesia for emergency cesarean section: regional or general?
Brichant, Jean-François ULg

Conference (2006, November 30)

Detailed reference viewed: 2 (0 ULg)
See detailLe théâtre de Denis Marion
Delhalle, Nancy ULg

Conference (2006, November 28)

Detailed reference viewed: 17 (1 ULg)
See detailMémoire de travail et vieillissement pathologique
Adam, Stéphane ULg

Conference (2006, November 26)

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See detailNatural and projectively equivariant quantizations
Radoux, Fabian ULg

Conference (2006, November 25)

Detailed reference viewed: 6 (3 ULg)
See detailL’autre et le même. Position du sujet et politique du corps
Durand, Pascal ULg

Conference (2006, November 24)

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See detailL'indépendance des juges constitutionnels en Belgique: aspects institutionnels, aspects individuels
Rosoux, Géraldine ULg; Henneuse, Roger

Conference (2006, November 23)

The contribution presents the guarantees for the independence of Belgian constitutional judges.

Detailed reference viewed: 120 (8 ULg)
See detailLe rôle des pouvoirs locaux et régionaux dans le développement du dialogue interreligieux
Husson, Jean-François ULg

Conference (2006, November 23)

This papers reviews the impact on interreligious dialogue (and on dialogue between religious communities and local authorities) of policy instruments at disposal of local government.

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See detailAnisocoria and Cerebro-Vascular Diseases
Martin, Didier ULg

Conference (2006, November 22)

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See detailLinearizing Option Returns for Portfolio and Risk Management: A Tetranomial Approach
Bodson, Laurent ULg; Hübner, Georges ULg

Conference (2006, November 21)

This paper proposes a method to deduce the first four moments and the co-moments (with any other asset) of an option return. We consider the dynamics of an option-replicating portfolio of four basic ... [more ▼]

This paper proposes a method to deduce the first four moments and the co-moments (with any other asset) of an option return. We consider the dynamics of an option-replicating portfolio of four basic assets: the underlying, two long-term options and a zero coupon bond. This approach allows us to capture the moments up to order four of the underlying and to linearize the option return. A numerical example illustrates some of the features and applications of this model. [less ▲]

Detailed reference viewed: 47 (16 ULg)
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See detailLe Goût du mort. Mauvais goût et limites du spectateur
Tomasovic, Dick ULg

Conference (2006, November 17)

Detailed reference viewed: 7 (0 ULg)
See detailLe financement des cultes et des organisations laïques en Belgique
Husson, Jean-François ULg

Conference (2006, November 17)

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See detailDIVA Graphical User Interface
Troupin, Charles ULg; Sirjacobs, Damien ULg; Beckers, Jean-Marie ULg

Conference (2006, November 13)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailEffects of vagal nerve stimulation in the rat orofacial formalin model of pain
Multon, S.; Scholsem, M.; Legrain, C. et al

Conference (2006, November 10)

Detailed reference viewed: 7 (4 ULg)
See detailUltraviolet auroral emissions in the solar system: a comparative view
Gérard, Jean-Claude ULg

Conference (2006, November 10)

Detailed reference viewed: 2 (0 ULg)
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See detailPour une théorie de l'agir environnemental
Mormont, Marc ULg

Conference (2006, November 09)

The paper proposes a theoretical approach of ecocitizenship that puts the empahasis ont the various was people make trade-off between various value systems.

Detailed reference viewed: 112 (27 ULg)
See detailNeuropsychological testing for the early diagnosis of Alzheimer's disease
Adam, Stéphane ULg

Conference (2006, November 09)

Detailed reference viewed: 4 (0 ULg)
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See detailLe travail sans la GRH : le secteur du bâtiment à l’heure de la sous-traitance financière
Deflandre, Dimitri; Pichault, François ULg; Xhauflair, Virginie ULg

Conference (2006, November)

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See detailIntervenir dans la conduite d’e-projets subventionnés: enjeux croisés et responsabilités des parties prenantes
Lisein, Olivier ULg; Dalon, Gelica; Desmecht, James

Conference (2006, November)

Accompagner la mise en oeuvre d'e-projets s’apparente fréquemment à un défi de taille. Dans ce cadre, les apports de la théorie de la traduction sont susceptibles de s’avérer utiles à tout intervenant ... [more ▼]

Accompagner la mise en oeuvre d'e-projets s’apparente fréquemment à un défi de taille. Dans ce cadre, les apports de la théorie de la traduction sont susceptibles de s’avérer utiles à tout intervenant appelé à accompagner une démarche de réflexion et/ou d’implémentation d’une innovation technologique. En cherchant notamment à intégrer, en plus des éléments contextuels, les attentes, intérêts et enjeux des parties prenantes, ce courant entend mobiliser les acteurs autour d’un projet commun et favoriser la "construction" conjointe de l’innovation. Cette approche se heurte néanmoins à la définition a priori de certaines dimensions des e-projets subventionnés par des fonds publics, rendue nécessaire notamment pour rencontrer les attentes du pouvoir subsidiant. Accompagner des projets figés par des conventions n’est par conséquent pas sans entraîner son lot de difficultés supplémentaires pour l’intervenant, que nous entendons considérer à partir d’un retour croisé sur trois expériences récentes en la matière. Celui-ci nous autorise en outre à soulever dans notre réflexion la double question du rôle de l’intervenant et de sa marge de manœuvre dans le cadre de projets subventionnés ainsi que celle de la responsabilité des parties prenantes par rapport à leurs enjeux divergents. [less ▲]

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See detailGeneralized shape optimization using XFEM and Level Set method
Duysinx, Pierre ULg; Van Miegroet, Laurent ULg; Jacobs, Thierry

Conference (2006, November)

This paper presents an intermediate approach between parametric shape optimization and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended ... [more ▼]

This paper presents an intermediate approach between parametric shape optimization and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended Finite Element Method (XFEM). The method takes benefit of the fixed mesh work using XFEM and of the smooth curves description of the Level Set method. Design variables are shape parameters of basic geometric features like circles, triangles etc. The number of design variables of this formulation is small whereas various global and local constraints can be considered. The Level Set description allows to modify the connectivity of the structure as geometric features can merge or separate from each other. However no new entity can be introduced by the programme. A central problem that is investigated here is the sensitivity analysis and the way it can be carried out efficiently. Numerical applications revisit some classical (academic) benchmarks from shape and topology optimization. [less ▲]

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See detailIdentification of a new aphid isoprenyl diphosphate synthase
Vandermoten, Sophie ULg; Beliveau, Catherine; Sen, Stéphanie et al

Conference (2006, November)

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See detailValidation exercise applied to some TRNSYS components in the context of IEA 34/43.
Adam, Ch.; Andre, Philippe ULg

Conference (2006, November)

An important part of IEA 34/43 is concerning validation of building simulation models. Analytical and comparative validation of multizone building simulation models are the object of Subtask B while ... [more ▼]

An important part of IEA 34/43 is concerning validation of building simulation models. Analytical and comparative validation of multizone building simulation models are the object of Subtask B while empirical validation of models dealing with the shading, day lighting and cooling load interaction is targeted by Subtask C. For the first approach, the Multizone Building Component of TRNSYS (“Type 56”) was tested in a series of exercises ranging from analytical and simplified cases up to more complex situations where special features like presence of site obstructions, internal windows are taken into account. The good capabilities of TRNSYS Type 56 as well as its limitations were pointed out by the exercise and the results are discussed in the paper. In the second approach, a well-instrumented testing infrastructure (a test-cell) located at EMPA in Zürich, Switzerland was used to check the performance of TRNSYS regarding the solar processing features (calculation of diffuse radiation; repartition of solar radiation on vertical facades) as well as the dynamic behavior of the Multizone Building model in different shading situations: no shading, internal shading, external shading. High quality measurements corresponding to periods of 600h were generated for each of these situations and the simulation model was tailored to represent as much as possible the experimental conditions. In general, the behavior of TRNSYS was demonstrated very good. The influence of some specific features of Type 56, for instance concerning the calculation of the infrared exchanges, is illustrated in the paper. [less ▲]

Detailed reference viewed: 165 (7 ULg)
See detailEndogenous mode of competition in general equilibrium
Tharakan, Joseph ULg

Conference (2006, November)

Detailed reference viewed: 8 (1 ULg)
See detailLes composes bromes : un risque émergent dans la chaîne alimentaire
Scippo, Marie-Louise ULg

Conference (2006, November)

Detailed reference viewed: 6 (0 ULg)
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See detailLe travail comme lieu d'exclusion et d'inégalités - la gestion de la diversité : une solution ?
Cornet, Annie ULg; Warland, Philippe

Conference (2006, November)

Detailed reference viewed: 35 (2 ULg)
See detailInvited Review Talk - Microscopic diffusion in stellar plasmas
Thoul, Anne ULg

Conference (2006, November)

Detailed reference viewed: 2 (0 ULg)
See detailVZV mutants: a way to overcome the reactivation of the vaccine virus
Sadzot-Delvaux, Catherine ULg

Conference (2006, November)

Detailed reference viewed: 8 (2 ULg)
See detailWidening the Circle of Nanoresearch: A Case for Reflective Action Research in Flemish Society
Van Oudheusden, Michiel ULg; Evers, Johan; Deblonde, Marian et al

Conference (2006, October 30)

Policy makers involved in innovation policy and scientists working on newly emerging technologies such as nanotechnologies, are confronted with three considerable challenges: a lack of distinct indicating ... [more ▼]

Policy makers involved in innovation policy and scientists working on newly emerging technologies such as nanotechnologies, are confronted with three considerable challenges: a lack of distinct indicating directions of possible applications (strategic uncertainty), a lack of scientific knowledge (complexity) and the ambiguous reception of new developments in society. In this climate of uncertainty and ambiguity it is by no means clear for the actors involved how to innovate purposefully and constructively. In response to such problems and difficulties, the Flemish interdisciplinary research project 'Nanotechnologies for Tomorrow's Society' (NanoSoc) engages innovation networks where each actor contributes his (incomplete) views and perspectives and confronts them with those of others. The project brings together nanotechnologists, natural and social scientists, stakeholders, and citizens in the region of Flanders, Belgium, to discuss and steer future nanotech developments in three particular fields of nanotechnology development: smart environment, bio on chip, and new materials. This article first discusses the main challenges in innovating successfully with nanotechnologies, to then elaborate on how NanoSoc seeks to effectively address these issues through interdisciplinary reflective action research. [less ▲]

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See detailMédecine générale / médecine familiale : fonctions collectives
Vanmeerbeek, Marc ULg

Conference (2006, October 30)

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See detailStudy of endocrine disruption in seabass (Dicentrarchus labrax)
Schnitzler, Joseph ULg; Koutrakis, Emmanuil; Thomé, Jean-Pierre ULg et al

Conference (2006, October 28)

Organochlorinated compounds such as polychlorobiphenyls (PCB), dichloro-diphenyl-dichloroethylene (DDE) and dichloro-diphenyl-trichloroethane (DDT) have the characteristic to influence the endocrine ... [more ▼]

Organochlorinated compounds such as polychlorobiphenyls (PCB), dichloro-diphenyl-dichloroethylene (DDE) and dichloro-diphenyl-trichloroethane (DDT) have the characteristic to influence the endocrine system of many fish species and mammals and are thus qualified as endocrine disruptors. The objective of this project aims a better understanding of the effects of these compounds on the thyroid function of European seabass (Dicentrarchus labrax). Thyroid tissue and muscle of 46 seabass from the Aegean Sea in Greece (fished and aquaculture, n=15 and n=31, respectively) were sampled. The levels in PCBs, DDT and DDE were evaluated in the muscles of 30 individuals. The diameter of follicles and the epithelial cell heights were measured in each individual by optical microscopy. The concentration of the thyroid hormone T4 (thyroxin) was measured by Radio-Immuno-Assay (RIA). Finally, the potential relationships between these thyroid parameters and these organic compounds were investigated using factor analysis and multiple regressions. A significant relationship between persistent organic pollutants (muscular PCBs and DDT concentration) and the different thyroid parameters (diameters of follicles, epithelial cell heights and muscular T4 levels) could be observed. We cannot exclude the assumption that an endocrine disruption of thyroid gland related to these pollutants could be the origin of the modifications of these thyroid parameters. [less ▲]

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See detailSerological diagnosis in 2006 and future prospects.
HUYNEN, Pascale ULg

Conference (2006, October 26)

Detailed reference viewed: 4 (0 ULg)
See detailLa procalcitonine: aspects biochimiques et analytiques
Chapelle, Jean-Paul ULg

Conference (2006, October 26)

Detailed reference viewed: 3 (0 ULg)
See detailPTH: que dosons-nous réellement?
Cavalier, Etienne ULg

Conference (2006, October 26)

Detailed reference viewed: 18 (2 ULg)
See detailIntérêt des biomarqueurs dans les syndromes coronariens aigus
Chapelle, Jean-Paul ULg

Conference (2006, October 25)

Detailed reference viewed: 1 (0 ULg)
See detailRegulation of metal homeostasis genes in Arabidopsis halleri
Hanikenne, Marc ULg

Conference (2006, October 19)

Detailed reference viewed: 3 (1 ULg)
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See detailExploitation de la CNSW au sein d'un réseau d'analyse et de conseil.
Genot, Valérie ULg; Oger, Robert

Conference (2006, October 18)

Detailed reference viewed: 14 (1 ULg)
See detail'Canopy-atmosphere interaction in forests: a key process in nutrient cycling and pollution interception
Carnol, Monique ULg; Guillaume, Patricia

Conference (2006, October 17)

An efficient way for assessing the nutrient status of an ecosystem is the establishment of nutrient input-output mass balance budgets at the catchment scale. For example, outputs (i.e. losses in ... [more ▼]

An efficient way for assessing the nutrient status of an ecosystem is the establishment of nutrient input-output mass balance budgets at the catchment scale. For example, outputs (i.e. losses in streamwater, through havesting etc.) greater than inputs (i.e. weathering, dry and wet deposition, fertiliser) indicate that a depletion of the given element is taking place. In forest ecosystems, element input via throughfall is an important pathway in nutrient cycling. Precipitation interacts with the stand canopy, resulting in increased/decreased solute inputs to the forest floor. For example, acid deposition (H, N) may be substantially increased through the filtering action of the tree canopy. Indeed, canopy throughfall chemical composition includes wet deposition (rainfall), dry deposition intercepted by the canopy and elements leached from the foliar tissue (canopy leaching). Moreover, interactions between canopy and atmosphere or precipitation depend on several factors such as: season, tree species and physiology, stand structure and health. However, canopy leaching results from an internal nutrient cycling process. Ignoring this component in throughfall measurements thus leads to an overestimation of the inputs to the ecosystem. In this paper, main results of studies performed in the Belgian Ardennes at the watershed (80 ha) and plot scale are summarised. The aim of this research was to quantify long-term nutrient budgets in a forested watershed, within a context of sustainable management. In this area, soils are naturally acidic and poor in magnesium, so that forest dieback symptoms reported from 1983 onwards were related to increased pollution exacerbating magnesium deficiency. There is concern that acid (S and N) deposition, together with sylvicultural management (harvesting, spruce monocultures etc.) could deplete the available cation pool and that soils would not be able to support intensive sylviculture on the long term. We measured concentrations and fluxes of major ions in bulk deposition, throughfall and stream water over 13 years. Throughfall deposition under coniferous (Picea abies (L.) Karst.) and several deciduous tree species was also compared. A canopy budget method was used for distinguishing between external (dry deposition) and internal (canopy leaching) sources of ions in the throughfall flux. The contribution of canopy leaching in throughfall measurements and consequences for mass balance calculations will be discussed. Furthermore, nutrient fluxes through the ecosystem will be examined with regard to the long term nutrient status of the system. [less ▲]

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See detailOccupational stress, work-home interference and burnout among Belgian bovine practitioners.
Hansez, Isabelle ULg; Biron, O.; Rollin, F.

Conference (2006, October 17)

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See detailCongenital muscular dystonia (CMD): a new congenital pathology in Belgian Blue calves
Vandeputte, Sébastien ULg; Brihoum, Mounir ULg; Hubin, Xavier et al

Conference (2006, October 15)

Detailed reference viewed: 46 (11 ULg)
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See detailWath’s new in the management of spinal cord injury ?
Martin, Didier ULg

Conference (2006, October 13)

Detailed reference viewed: 5 (1 ULg)
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See detailLa sexologie clinique en Belgique
Kempeneers, Philippe ULg

Conference (2006, October 07)

Le point sur la formation et la reconnaissance légale des sexologues et des sexologues cliniciens en belgique (2006)

Detailed reference viewed: 98 (2 ULg)
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See detailL'accompagnement dans Formasup
Poumay, Marianne ULg

Conference (2006, October 06)

Detailed reference viewed: 18 (3 ULg)
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See detailMeasuring a conceptual model of military turnover.
Bertrand, Françoise ULg; Schreurs, B.; Lescreve, F. J. et al

Conference (2006, October 05)

Detailed reference viewed: 15 (1 ULg)
See detailPrésentation du futur tome 17 de l'ALW
Baiwir, Esther ULg

Conference (2006, October 04)

Detailed reference viewed: 8 (1 ULg)
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See detailDie Frage nach der Identität: Uwe Johnson und Max Frisch
Letawe, Céline ULg

Conference (2006, October 02)

Detailed reference viewed: 24 (2 ULg)
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See detailBuilding the EnCOrE dictionare collaboratively: Strategy and Practice
Colaux, Catherine ULg

Conference (2006, October)

Detailed reference viewed: 4 (2 ULg)
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See detailRethinking Flexicurity at the work situations level
Pichault, François ULg; Xhauflair, Virginie ULg

Conference (2006, October)

Detailed reference viewed: 9 (1 ULg)
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See detailProtocols for building an Organic Chemical Ontology
Colaux, Catherine ULg

Conference (2006, October)

Detailed reference viewed: 5 (0 ULg)
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See detailSyntactictal and automatic properties of sets of polynomials over finite fields
Rigo, Michel ULg

Conference (2006, October)

Detailed reference viewed: 8 (1 ULg)
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See detailStrutural properties of bounded languages with respect to multiplication by a constant
Charlier, Emilie ULg

Conference (2006, October)

We consider the preservation of recognizability of a set of integers after multiplication by a constant for numeration systems built over a bounded language. As a corollary we show that any nonnegative ... [more ▼]

We consider the preservation of recognizability of a set of integers after multiplication by a constant for numeration systems built over a bounded language. As a corollary we show that any nonnegative integer can be written as a sum of binomial coefficients with some prescribed properties. [less ▲]

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See detailThe B-CGMS project : evaluation after 5 years of monitoring and prediction
Curnel, Y.; Oger, Robert ULg; Leteinturier, B. et al

Conference (2006, October)

The B-CGMS project, started in 1998, is the adaptation to Belgian Conditions of the European Crop Growth Monitoring System (CGMS). This project involved 3 Belgian scientific institutes: the Walloon ... [more ▼]

The B-CGMS project, started in 1998, is the adaptation to Belgian Conditions of the European Crop Growth Monitoring System (CGMS). This project involved 3 Belgian scientific institutes: the Walloon agricultural research Centre (CRA-W), the Flemish Institute for Technological Research (VITO) and the University of Liège (ULg). The main difference with the European system is that more detailed inputs (meteorological, soil and NUTS inputs) are used. Crop yields predictions are realised on a monthly basis during the growing season (from April to September) for 6 crops (winter wheat, winter barley, maize, Potato, sugar beet, winter rapeseed). Yields predictions as well as analyses of meteorological situation of the month and RS information on the state of the crops are published in agrometeorological bulletins sent by e-mail since 2002. The information is also available on the Internet website of the project (http://.b-cgms.cra.wallonie.be). Crop yields predictions are produced through a combination of linear regression models which may include different categories of yield indicators (trend, meteo, RS and agrometeorological model outputs). Crop yields predictions procedure is currently semi-automated by the use of a statistical calibration toolbox (StatCaT). The evaluation of the project after 5 years of monitoring and prediction has first shown that final yields predicted B-CGMS as well as the ones predicted by MARS are coherent compared with official yields: no significant differences are observed. As far as the accuracy according to the month for which the prediction is made is concerned, we can notice that at agricultural circumscriptions level and for winter crops a lower precision of B-CGMS is observed before June and that there is no improvement in July (in comparison with June). The same evolution is observed for summer crops before July but in August and September, the prediction accuracy decreases. Even if calibration models present high adjusted coefficient of determination, the technological trend explains an important part of the variability and it is therefore necessary to consider the effect of a year factor on the quality of prediction in order to clearly the interest of the agrometeorological model. For some crops (as potato), adding agrometeorological yield outputs to models including already the technological trend allow to improve the quality of prediction especially for “extreme” year i.e. years where official yields move away significantly from the technological trend. For others crops as winter wheat, this improvement of the quality of prediction is not observed. However, fortunately, adding other yield indicators as meteo indicators can improve in general the quality of prediction and once again especially for “extreme” years. [less ▲]

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See detailVilles et Villages en Santé/Villes Santé face à la multiplication des politiques et des stratégies intersectorielles locales: les chemins de la cohérence
Brunet, Sébastien ULg

Conference (2006, October)

Malgré toute la modernité qui caractérise nos sociétés, nombre de phénomènes paraissent encore et toujours en attente de politiques et d’actions adéquates et concertées. La santé n’échappe évidemment pas ... [more ▼]

Malgré toute la modernité qui caractérise nos sociétés, nombre de phénomènes paraissent encore et toujours en attente de politiques et d’actions adéquates et concertées. La santé n’échappe évidemment pas à cette situation, et ce malgré, les préoccupations croissantes en la matière. La difficulté est d’autant plus insurmontable que la santé représente un domaine d’investigation gigantesque où se croisent, si l’on adopte la définition de l’OMS1, une myriade d’acteurs de terrain en prise avec une quantité potentiellement illimitée de dimensions influençant la santé. Si les conditions de vie semblent s’améliorer dans un certain nombre de pays, on peut regretter que ce constat ne puisse être étendu à l’ensemble de la planète. L’objectif poursuivi par les pays fondateurs de l’OMS en 1946 d’atteindre le plus haut niveau de santé pour l’ensemble des individus, reste donc encore et toujours devant nous.Si tout le monde sait que la santé ne se décrète pas, personne ne niera que la santé est le fruit de la rencontre de « circonstances » qui sont par contre produites par nos sociétés. Les pouvoirs publics ont, dans ce contexte, une part de responsabilité indéniable. Plus précisément, les mandataires publics ont pour mission, à tout le moins dans les systèmes politiques démocratiques, d’assurer à l’ensemble de la population, des conditions de vie acceptables. Si l’on concentre son attention sur les pays les plus favorisés, on se rend compte de l’existence d’un certain nombre de difficultés pour une gestion cohérente et efficace de la santé. [less ▲]

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See detailMonitoring of the crop water stress in Belgium. The case of the 2003 heat wave.
Horion, Stephanie; Tychon, Bernard ULg; De Longueville, Florence ULg

Conference (2006, October)

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized ... [more ▼]

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized Difference Vegetation Index, [NDVI] applied on S10 SPOT-VGT imagery, (iii) the Normalized Difference Water Index, [NDWI] applied on S10 SPOT-VGT imagery. [less ▲]

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See detailImpact de l'apprentissage de la lecture et de l'écriture en anglais sur l'acquisition ultérieure de la lecture et de l'orthographe en français chez les enfants francophones immergés en anglais
Nicolay, Anne-Catherine ULg; Fantauzzi, A.; Comblain, Annick ULg et al

Conference (2006, October)

Apprendre à lire dans une langue n’interfère pas avec l’apprentissage de la lecture dans une autre langue mais prépare plutôt le terrain pour apprendre à lire dans une autre langue. Comme dans le langage ... [more ▼]

Apprendre à lire dans une langue n’interfère pas avec l’apprentissage de la lecture dans une autre langue mais prépare plutôt le terrain pour apprendre à lire dans une autre langue. Comme dans le langage oral, il peut y avoir quelques « mixing » de prononciation au niveau des mots qui disparaissent progressivement au fur et à mesure que les langues se compartimentalisent. Avec le temps, l’enfant apprendra également que des mots qui s’écrivent de la même manière dans les deux langues peuvent se prononcer de manière différente. Une recherche menée sur des enfants francophones Belges suivant un programme d’immersion scolaire en anglais et ayant appris à lire en anglais confirment ces observations. 150 enfants âgés de 7 à 12 ans fréquentant ce programme ont été testés sur leurs compétences en lecture du français (décodage et compréhension). Leurs performances (type et nombre d’erreurs, vitesse de lecture) ont été comparées à celles d’enfants francophones fréquentant un enseignement unilingue. Leurs habiletés métaphonologiques (manipulation de la rime et du phonème) ont également été testées. [less ▲]

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See detailMonitoring of the crop water stress in Belgium. The case of the 2003 heat wave.
Horion, Stéphanie; Tychon, Bernard ULg; De Longueville, Florence ULg

Conference (2006, October)

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized ... [more ▼]

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized Difference Vegetation Index, [NDVI] applied on S10 SPOT-VGT imagery, (iii) the Normalized Difference Water Index, [NDWI] applied on S10 SPOT-VGT imagery. The RSMI is one of the outputs of the Belgian Crop Growth Monitoring System. It indicates the soil water availability for crops. Crop water stress is assumed when soil water availability is lower than the crop potential evapotranspiration. One of the potential applications for drought monitoring is the calculation of the number of days with a crop water stress during the growing season or more precisely during the “moisture-sensitive period” of the crop. The two others (well-known) indices are derived from low resolution satellite imagery. Complete time series of S10 SPOT-VGT NDVI and NDWI data - i.e. from April 1998 onwards – have been acquired for the research. Using spatial information on land-uses in Belgium, a simple unmixing method is implemented to partly reduce the problem of mixed values occurring inevitably in 1x1km² pixels. Only the most agricultural pixels are considered for the analysis. The heat wave occurred during the summer 2003 has been chosen as a study case for the comparison. This summer was particularly hot, dry and sunny with the highest averaged temperature ever recorded from June to August in Uccle-Belgium. Many human activities were affected by this particular climatic condition, among which agriculture. In order to make the comparison possible, a standardization of the outputs of the 3 indexes is realised, taking into account the times series of each indexes. Moreover all the outputs are aggregated at municipality level. [less ▲]

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See detailLes femmes entrepreneures et la transmission d’entreprise
Constantinidis, Christina ULg; Cornet, Annie ULg

Conference (2006, October)

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See detailDownscaling of ECMWF grid meteorological data : comparison with ground stations and validation
Tychon, Bernard ULg; Horion, Stéphanie

Conference (2006, October)

CGMS currently operates on observed station data. Switching from this classical approach to a modelled data from European Centre for Medium-range Weather Forecast, ECMWF, has to be tested before applying ... [more ▼]

CGMS currently operates on observed station data. Switching from this classical approach to a modelled data from European Centre for Medium-range Weather Forecast, ECMWF, has to be tested before applying it operationally. In this study, we concentrated on the impact of the downscaling of meteorological data with grid sizes ranging from 1.875 to 0.35 degrees to the new CGMS grid size of 25 X 25 km. Four different grid sizes corresponding respectively to the dimensions of the Operational, EPS, Monthly and Seasonal ECMWF Models were checked. The control was done on daily data of 25 stations selected on a 2-year period in a window covering the South of Germany and Czech Republic, a large part of Austria and the North of Italia in order to analyse the downscaling impact on plains, mountainous and coastal zones. For each grid size, four different downscaling methods were applied: the reference method that uses the classical CGMS interpolation procedure, the nearest neighbour approach, and two more complicated interpolation techniques using the Model Output Statistics developed by Meteo Consult (MC-MOS). The analysis showed that the accuracy of the downscaling procedure is largely influenced by the input data grid size. RMSE increases between the smallest and the largest grids are respectively 59%, 51%, 33%, and 33% for Tmax, Tmin, Wind Speed and Radiation fields. Rainfall does not seem to be affected by the downscaling process but the RMSE is high in all cases. In most cases, the best interpolation method is also the more complex one and the one that requires more computer time to be calculated. RMSE decrease of 22%, 50%, 57% and 28% respectively for Tmax, Tmin, Wind speed and Radiation fields when we compare the best interpolation method results with the reference approach. An exception in this general rule is for the rainfall rate estimation whose accuracy is not always best with the most complex interpolation technique. [less ▲]

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See detailGreen leaf area decline of wheat top three leaves in Belgium and G-D of Luxembourg from 2003 to 2006 : the relationships with grain yield.
Martin, B.; Tychon, Bernard ULg; El Jarroudi, Moussa ULg et al

Conference (2006, October)

The modified Gompertz model developed by Gooding et al. (2000) was used to describe the decline in green area of wheat top three leaves in field experiments where green leaf area at time t = 100*exp[-exp ... [more ▼]

The modified Gompertz model developed by Gooding et al. (2000) was used to describe the decline in green area of wheat top three leaves in field experiments where green leaf area at time t = 100*exp[-exp(-k*(t-m))]. In the absence of fungicide, green leaf area decline was associated with drought or infection with a number of foliar pathogens including Septoria tritici (sexual stage Mycospherella graminicola) and Puccinia recondita f.sp. tritici and Erysiphe graminis. On the whole experiments and cultivars there was no effect of fungicide on k but it was highly significant on m (P<0.001). When main effects are considered, fungicide delayed green leaf area decline rather than reduced its rate of progress once started. Fungicide had variable effects on grain yield, largely reflecting variation in disease infection pressures in the different years and susceptibility of the different cultivars. If no correlation was observed between k values and grain yields, m was at the contrary very closely associated with grain yields. This study supports the view of Gooding (2000) and Gaunt (1995) that, for many diseases, effects on green area duration give an adequate estimate of host yield reduction. Therefore we have use the close relationship between the parameter m of the Gompertz model and grain yield to improve the Belgium-Crop Growth Monitoring System (B-CGMS) by recalibrating LAI evolution simulated by B-CGMS according to the evolution of LAI derived from the Gompertz model. The system includes indeed a component allowing taking into account senescence in the evolution of LAI during the growing season. Recalibration has been realized through the modification of one of the parameters influencing the leaf senescence, the SPAN parameter. Modifying the SPAN parameter comes down to modify the lifespan of leaves. Considering that parasitic pressure reduces leaves lifespan and therefore the photosynthetic capacity, this approach makes it possible to take into account the influence of this pressure on yield predictions in the Belgian Crop Growth Monitoring System. [less ▲]

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See detailEmpirical regression models using NDVI, rainfall and temperature data for the early prediction of wheat grain yields in Morocco
Balaghi, Riad; Tychon, Bernard ULg; Eerens, H. et al

Conference (2006, October)

In Morocco, no operational system actually exists for the early prediction of the grain yields of bread wheat. This study proposes empirical Ordinary Least Squares regression models to forecast the yields ... [more ▼]

In Morocco, no operational system actually exists for the early prediction of the grain yields of bread wheat. This study proposes empirical Ordinary Least Squares regression models to forecast the yields at provincial and national levels. The predictions were based on dekadal (10-daily) NDVI/AVHRR, dekadal rainfall sums and average monthly air temperatures. The global land cover map GLC2000 was used to select only the NDVI pixels that are related to agricultural lands. Provincial yields were assessed with errors varying from 80 to 762 kg.ha-1, depending on the province. At national level, yield was predicted at the third dekad of April with 73 kg.ha-1 error, using NDVI and rainfall. However, earlier forecasts are possible, starting from the second dekad of March with 84 kg.ha-1 error. At the province and country levels most of the yield variation was accounted for by NDVI. The proposed models can be used in an operational context to forecast bread wheat yields in Morocco. [less ▲]

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See detailNumerical and experimental research in river hydrodynamics and hydraulic engineering
Dewals, Benjamin ULg

Conference (2006, September 29)

Detailed reference viewed: 5 (1 ULg)
See detailMacromolecular engineering of cyclic aliphatic polyesters by ring-opening polymerization
Lecomte, Philippe ULg; Riva, Raphaël ULg; Li, Haiying et al

Conference (2006, September 24)

Detailed reference viewed: 8 (3 ULg)