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See detailN2O eddy covariance fluxes : from field measurements to flux analysis
Lognoul, Margaux ULg; Debacq, Alain ULg; Heinesch, Bernard ULg et al

Poster (2017, April 28)

N2O eddy covariance data were collected for a complete season of sugar beet crop (from first fertilization to harvest). Data treatment and preliminary results are presented.

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See detailThree-dimensional modelling of the hydrodynamics of the Southern Bight of the North Sea: first results
Ivanov, Evgeny ULg; Capet, Arthur ULg; Barth, Alexander ULg et al

Poster (2017, April 28)

In the frame of the Belgian research project FaCE-It (Functional biodiversity in a Changing sedimentary Environment: Implications for biogeochemistry and food webs in a managerial setting), the impact of ... [more ▼]

In the frame of the Belgian research project FaCE-It (Functional biodiversity in a Changing sedimentary Environment: Implications for biogeochemistry and food webs in a managerial setting), the impact of dredging activities andoffshorewindfarminstallationonthespatialdistributionofsedimentgrainsize,biodiversityandbiogeochemistry will be estimated in the Southern Bight of the North Sea (SBNS) with a focus on the Belgian Coastal Zone (BCZ). To reach this goal, the three-dimensional hydrodynamical model ROMS-COAWST is implemented in the SBNS in order to simulate the complex hydrodynamics and sediment transport. Two levels of nesting are used to reach a resolutionof250mintheBCZ.Themodelisforcedattheair-seainterfacebythe6-hourlyECMWFERA-interim atmospheric dataset and at the open boundaries by the coarse resolution model results available from CMEMS (Copernicus Marine Environment Monitoring Service), and also considers tides and 4 main rivers (Scheldt, Rhine with Maas, Thames and Seine). Two types of simulations have been performed: a 10-years climatological simulation and a simulation over 20032013toinvestigatetheinterannualdynamics.Themodelskillsareevaluatedbycomparingitsoutputstohistorical data (e.g. salinity, temperature and currents) from remote sensing and in-situ. The sediment transport module will then be implemented and its outputs compared to historical and newly collected (in the frame of FaCE-iT) observations on grain size distribution as well as with satellite Suspended Particulate Matter (SPM) images. This will allow assessing the impact of substrate modification due to offshore human activities at local and regional scales. [less ▲]

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See detailPosterior approach in total hip arthroplasty
KURTH, William ULg

Conference (2017, April 28)

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See detailGlobally significant greenhouse-gas emissions from African inland waters
Borges, Alberto ULg; Bouilon, S

Conference (2017, April 28)

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See detailGrazing-induced BVOC fluxes from a managed grassland
Mozaffar, Ahsan ULg; Schoon, N.; Bachy, Aurélie ULg et al

Poster (2017, April 28)

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See detailMotion analysis: a prevention tool
Schwartz, Cédric ULg; CROISIER, Jean-Louis ULg; Forthomme, Bénédicte ULg et al

Conference (2017, April 28)

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See detailA landslide susceptibility map of Africa
Broeckx, Jente; Vanmaercke, Matthias ULg; Duchateau, Rica et al

Conference (2017, April 28)

Studies on landslide risks and fatalities indicate that landslides are a global threat to humans, infrastructure and the environment, certainly in Africa. Nonetheless our understanding of the spatial ... [more ▼]

Studies on landslide risks and fatalities indicate that landslides are a global threat to humans, infrastructure and the environment, certainly in Africa. Nonetheless our understanding of the spatial patterns of landslides and rockfalls on this continent is very limited. Also in global landslide susceptibility maps, Africa is mostly underrepresented in the inventories used to construct these maps. As a result, predicted landslide susceptibilities remain subject to very large uncertainties. This research aims to produce a first continent-wide landslide susceptibility map for Africa, calibrated with a well-distributed landslide dataset. As a first step, we compiled all available landslide inventories for Africa. This data was supplemented by additional landslide mapping with Google Earth in underrepresented regions. This way, we compiled 60 landslide inventories from the literature (ca. 11000 landslides) and an additional 6500 landslides through mapping in Google Earth (including 1500 rockfalls). Various environmental variables such as slope, lithology, soil characteristics, land use, precipitation and seismic activity, were investigated for their significance in explaining the observed spatial patterns of landslides. To account for potential mapping biases in our dataset, we used Monte Carlo simulations that selected different subsets of mapped landslides, tested the significance of the considered environmental variables and evaluated the performance of the fitted multiple logistic regression model against another subset of mapped landslides. Based on these analyses, we constructed two landslide susceptibility maps for Africa: one for all landslide types and one excluding rockfalls. In both maps, topography, lithology and seismic activity were the most significant variables. The latter factor may be surprising, given the overall limited degree of seismicity in Africa. However, its significance indicates that frequent seismic events may serve as in important preparatory factor for landslides. This finding concurs with several other recent studies. Rainfall explains a significant, but limited part of the observed landslide pattern and becomes insignificant when also rockfalls are considered. This may be explained by the fact that a significant fraction of the mapped rockfalls occurred in the Sahara desert. Overall, both maps perform well in predicting intra-continental patterns of mass movements in Africa and explain about 80% of the observed variance in landslide occurrence. As a result, these maps may be a valuable tool for planning and risk reduction strategies. [less ▲]

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See detailLe marché du livre à Bruxelles au XVIe siècle
Adam, Renaud ULg

Conference (2017, April 28)

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See detailImplémentation du programme Lidcombe dans la prise en charge du bégaiement en clinique francophone
Leclercq, Anne-Lise ULg

Conference (2017, April 28)

This talk presents preliminary results of the Lidcombe program on French stuttering preschool children. The purpose is to discuss its effectiveness in regular clinical context, and with various profiles ... [more ▼]

This talk presents preliminary results of the Lidcombe program on French stuttering preschool children. The purpose is to discuss its effectiveness in regular clinical context, and with various profiles of children. [less ▲]

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See detailAgroforestry in temperate regions: where does the water go?   A case study with ERT in a corn field bordered by poplar trees.
MALOTEAU, Sophie ULg; Coussement, Tom; Pardon, Paul et al

Conference (2017, April 28)

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See detailPhotosensitive polydimethylsiloxane networks for adjustable-patterned films
Jellali, Rachid; Alexandre, Michaël; Jérôme, Christine ULg

in Polymer Chemistry (2017), 8(16), 2499-2508

Polydimethylsiloxanes (PDMSs) bearing photoreactive coumarin groups have been synthesized by amida- tion of a coumarin acid chloride derivative with various amine-functionalized PDMSs. Upon exposure to UV ... [more ▼]

Polydimethylsiloxanes (PDMSs) bearing photoreactive coumarin groups have been synthesized by amida- tion of a coumarin acid chloride derivative with various amine-functionalized PDMSs. Upon exposure to UV light having a wavelength of above 300 nm, multifunctional coumarin-PDMSs are transformed into covalent networks via [2 + 2] photocycloaddition of two coumarin moieties forming a cyclobutane ring. Taking advantage of the possible localized irradiation through a photomask, a novel concept to generate patterned PDMS films with various surface topologies was demonstrated. This concept is based on the combination of a low molar mass difunctional PDMS with a multifunctional PDMS of a high molar mass forming a photoreversible network allowing osmotic diffusion of a linear PDMS-coumarin of low mole- cular weight in a loosely crosslinked network. Advantageously, illumination by a light source at 254 nm induces the photocleavage of the cyclobutane cross-links offering some photo-induced reversibility to the PDMS network. These novel photo-responsive networks are interesting for several applications, in photo-adaptable biomedical implants (particularly photo-adjustable intra-ocular lenses), photo-tuneable patterned microsystems (e.g. for microfluidics) and photo-switchable controlled release systems. [less ▲]

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See detailWhen expertise isn't enough for making policy: illustrations from the university field
Schoenaers, Frédéric ULg

Scientific conference (2017, April 28)

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See detailThe role of coordinators in the internment public policy translation
Darcis, Coralie ULg

Conference (2017, April 28)

With this presentation, we would like to focus on the particular role of “coordinators” within a context of policy implementation process (Multiannual plans and Masterplan). We will show that the TSI ... [more ▼]

With this presentation, we would like to focus on the particular role of “coordinators” within a context of policy implementation process (Multiannual plans and Masterplan). We will show that the TSI Coordinators endorsed a role of “Translators” [Latour and Callon] since they are at the heart of this implementation process. We therefore argue that those Health Coordinators circulate knowledge between policy-makers and field professionals, between justice and health professionals and between other health coordinators and themselves. This circulation of knowledge can be observed in meetings organised at both the local and federal levels, as well as through more informal meetings and participation in working groups. Coordinators are also inscribing knowledge by writing documents, mails and minutes of meetings. Finally, we would like to argue that this circulation and inscription of knowledge allow the policy implementation process by reinforcing the articulation [Strauss] both between local and policy levels and between justice and health sectors. [less ▲]

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See detailLa stigmatisation liée à l’âge … Impact sur la santé physique et mentale de nos aînés!
Missotten, Pierre ULg; Schroyen, Sarah ULg

Conference given outside the academic context (2017)

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See detailCaractérisation et élaboration d'un outil de surveillance des cuvettes oasiennes et de leurs alentours par télédétection et système d'information
Karimou Barké, Mahamadou Salifou ULg

Doctoral thesis (2017)

Situées en zone semi-aride, les cuvettes oasiennes du centre-est du Niger sont des agro-écosystèmes à hautes potentialités. C’est seulement à l’intérieur de ces dernières que l’agriculture est possible ... [more ▼]

Situées en zone semi-aride, les cuvettes oasiennes du centre-est du Niger sont des agro-écosystèmes à hautes potentialités. C’est seulement à l’intérieur de ces dernières que l’agriculture est possible durant toute l’année. Ces cuvettes oasiennes ont connu de nombreux investissements de la part de plusieurs ONGs et projets au cours des dernières années. Cependant, elles sont souvent peu connues par ces acteurs du développement du fait de leur grand nombre et de leur extrême diversité. Cette thèse cherche à réduire cette méconnaissance à travers les activités suivantes: • évaluer les performances de trois méthodes de classification d’images appliquées à la détection de ces cuvettes oasiennes dans le Département de Gouré. Ces méthodes sont l’analyse pixellaire, l’analyse texturale et l’analyse par objet. Elles sont appliquées à des images SPOT 5-THX de 2.5 m de résolution ; • caractériser la forme des cuvettes oasiennes avec deux indices morphologiques (l’indice de compacité de Gravelius et l’indice fractale de leurs contours) ainsi que leurs orientations en utilisant les secteurs de la rose de vent comme repères ; • évaluer les contraintes et potentialités liées aux unités de paysage des cuvettes et de leurs alentours pour l’ensemble des cuvettes oasiennes à partir des extensions de ces unités de paysage, élaborer des indicateurs spatiaux de caractérisation des cuvettes ; • analyser la dynamique de l’occupation des sols de cuvettes oasiennes et de leurs alentours en utilisant les images Landsat 5-TM de 1984, les images SPOT 3 de 1996 et les images SPOT 5-THX de 2013. • proposer un outil de monitoring et une esquisse de système expert orienté à partir des données récoltées par ce biais sur l’ensemble des cuvettes de la zone d’étude. L’évaluation des résultats montre que l’approche par objet (précision globale égale à 97.12%, coefficient Kappa égal à 0.97) est plus performante que celles utilisant la texture (précision globale égale à 89.61%, coefficient Kappa égal à 0,90) et l’analyse par pixel (précision globale égale à 80.58 %, coefficient Kappa égal à 0.80). Une première information originale, à savoir le nombre, la position et la surface de l’ensemble des cuvettes sur la zone d’étude est fournie. Le nombre total de cuvettes oasiennes dans le Département de Gouré est ainsi estimé à 10717. Cet inventaire de ces lieux stocks de ressources est une première étape obligatoire pour leur caractérisation morphologique et pour l’évaluation de leurs potentialités agricoles. L’indice de forme de Gravelius met en évidence une certaine diversité de leurs contours : des cuvettes circulaires (9%), ovales (47%), amiboïdes (11%), étirées (18%) et très étirées ou étirées-amiboïdes (16%). La dimension fractale permet de distinguer trois classes de cuvette selon le degré de lissage de ces contours : très lissées (39%), lissées (50%) et moyennement lissées (10%). Le lissage est interprété ici comme un indicateur d’éolisation des pourtours des cuvettes. Enfin la détermination de l’orientation des grands axes des cuvettes a permis d’identifier quatre secteurs majeurs : E-W (23%), N-S (21%), NE-SW (22%) et SE-NW (34%). Ces analyses morphologiques et d’orientation appliquées pour la première fois à l’ensemble des cuvettes oasiennes du Département de Gouré offrent des éléments permettant de comprendre les processus d’ensablement des cuvettes oasiennes dans cette zone. L’analyse des indicateurs des potentialités naturelles à la mise en valeur agricole montre que les cuvettes oasiennes sont des espaces multi-usages, avec des aptitudes en arboriculture, maraîchage, en natron et en foresterie selon les unités géomorphologiques. Le pourcentage des surfaces cultivables est faible pour 45.8% des cuvettes et fort à très fort pour seulement 3.9 %. Celui des surfaces boisées est très fort sur 61.6 % des cuvettes soit 51.4 % en superficie. Les cuvettes possédant un sol nu à natron et/ou une nappe d’eau affleurante représentent 17.6 % des cuvettes. Quant aux indicateurs de risque de dégradation, ils montrent que 3.3 % et 0.5 % des cuvettes ont respectivement une menace d’ensablement fort et très fort à moyen terme. Alors qu’à terme immédiat, c’est respectivement 3% et 0.8 % des cuvettes dont la menace d’ensablement est fort et très fort. Concernant l’évolution récente de ces milieux, les superficies des cuvettes oasiennes ont régressé de 46783 ha en 1984, à 40831 ha en 1996 et 34553 ha en 2013. Inversement, leur nombre a augmenté de 1984 (8911) à 2013 (10717). Ceci s’explique certes pour partie par les résolutions différentes des images satellitaires utilisées, mais surtout par la fragmentation de certaines cuvettes du fait de leur dégradation et la création de nouvelles cuvettes par l’érosion éolienne. Cette dynamique est accentuée par celle de l’occupation humaine des paysages. Les abords des cuvettes et des vallées sèches constitués souvent d’édifices dunaires sont de plus en plus occupés par les cultures pluviales qui les exposent davantage à l’érosion. En 1984, les édifices dunaires et vallées sèches à culture pluviale représentent 295697 ha alors, qu’en 1996 et 2013, elles occupent respectivement 368153 ha et 423876 ha. Les systèmes d’information à référence spatiale esquissés permettent d’observer et de suivre la totalité des cuvettes oasiennes. Ce système, conçu en utilisant le langage UML, a permis non seulement d’établir des relations entre les indicateurs de potentiel valorisable et de dégradation mais aussi des informations supplémentaires récoltées sur le terrain (village, marché, zone de fixation biologique et mécanique des dunes). Ils offrent un accès aisé à ces indicateurs grâce à une interface informatique. À travers des requêtes sur cette base de données, les cuvettes à menace très forte nécessitant une intervention urgente pour leur conservation ont été mises en évidence ainsi que les variables explicatives du niveau d’exploitation des cuvettes. [less ▲]

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See detailHigher Needs for Enacted Knowledge. The case of Belgian Prison Governors
Dubois, Christophe ULg

Scientific conference (2017, April 27)

Considering that Belgian prison policy has been characterized by an increase of managerial and legal regulations in the last fifteen years, this rise of “inscribed knowledge” (Freeman & Sturdy, 2015 ... [more ▼]

Considering that Belgian prison policy has been characterized by an increase of managerial and legal regulations in the last fifteen years, this rise of “inscribed knowledge” (Freeman & Sturdy, 2015) leads to a sharper need of prison managers for “practical wisdom” (Chia and Holt, 2009). Two statements enlighten this paradoxical irony. Firstly, law and policy don't apply automatically, but must always be interpreted by human actors in relation to the situation. Secondly, the increase in legal and managerial demands reinforces prison governors’ more general inclinations to “satisficing” decisions (Simon, 1956). Drawing on two years of qualitative research with 30 Belgian prison governors, Christophe aims at analysing how prison governors are “enacting” prison policy and organisations (Weick, 1988), rather than being simply determined by it. [less ▲]

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See detailWater chemical evolution in Underground Pumped Storage Hydropower plants and induced consequences.
Pujades, Estanislao ULg; Orban, Philippe ULg; Jurado Elices, Anna ULg et al

Conference (2017, April 27)

Underground Pumped Storage Hydropower (UPSH) using abandoned mines is an alternative to manage the elec- tricity production in flat regions. UPSH plants consist of two reservoirs; the upper reservoir is ... [more ▼]

Underground Pumped Storage Hydropower (UPSH) using abandoned mines is an alternative to manage the elec- tricity production in flat regions. UPSH plants consist of two reservoirs; the upper reservoir is located at the surface or at shallow depth, while the lower reservoir is underground. These plants have potentially less constraints that the classical Pumped Storage Hydropower plants because more sites are available and impacts on landscape, land use, environment and society seem lower. Still, it is needed to consider the consequences of the groundwater exchanges occurring between the underground reservoir and surrounding porous media. Previous studies have been focused on the influence of these groundwater exchanges on the efficiency and on groundwater flow impacts. However, hydrochemical variations induced by the surface exposure of pumped water and their consequences have not been yet addressed. The objective of this work is to evaluate the hydrochemical evolution of the water in UPSH plants and its effects on the environment and on the UPSH efficiency. The problem is studied numerically by means of reactive transport modelling. Different scenarios are considered varying the chemical properties of the surrounding porous medium and groundwater. Results show that the dissolution and/or precipitation of some compounds may affect (1) the groundwater quality, and (2) the efficiency and the useful life of the used pumps and turbines of the UPSH system. [less ▲]

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