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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 detailDeveloping suitable methods for effective characterization of electrical properties of root segments
Ehosioke, Solomon ULg; Phalempin, Maxime; Garré, Sarah ULg et al

Conference (2017, April 28)

Developing suitable methods for effective characterization of electrical properties of root segments Solomon Ehosioke (1), Maxime Phalempin (2), Sarah Garré (3), Andreas Kemna (4), Sander Huisman (5 ... [more ▼]

Developing suitable methods for effective characterization of electrical properties of root segments Solomon Ehosioke (1), Maxime Phalempin (2), Sarah Garré (3), Andreas Kemna (4), Sander Huisman (5), Mathieu Javaux (2), and Frédéric Nguyen (1) (1) Department of Architecture, Geology, Environment & Constructions, university of Liege, Liège, Belgium, (2) Earth and Life Institute, Environmental Science, Université catholique de Louvain, Louvain-la-Neuve, Belgium, (3) Biosystems Engineering Department, Gembloux Agro-Bio Tech, University of Liege, Gembloux, Belgium, (4) Department of Geophysics, Steinmann Institute, University of Bonn, Germany, (5) Agrosphere (IBG3), Forschungszentrum Ju¨lich GmbH, Ju¨lich, Germany The root system represents the hidden half of the plant which plays a key role in food production and therefore needs to be well understood. Root system characterization has been a great challenge because the roots are buried in the soil. This coupled with the subsurface heterogeneity and the transient nature of the biogeochemical processes that occur in the root zone makes it difficult to access and monitor the root system over time. The traditional method of point sampling (root excavation, monoliths, minirhizotron etc.) for root investigation does not account for the transient nature and spatial variability of the root zone, and it often disturbs the natural system under investigation. The quest to overcome these challenges has led to an increase in the application of geophysical methods. Recent studies have shown a correlation between bulk electrical resistivity and root mass density, but an understanding of the contribution of the individual segments of the root system to that bulk signal is still missing. This study is an attempt to understand the electrical properties of roots at the segment scale (1-5cm) for more effective characterization of electrical signal of the full root architecture. The target plants were grown in three different media (pot soil, hydroponics and a mixture of sand, perlite and vermiculite). Resistance measurements were carried out on a single segment of each study plant using a voltmeter while the diameter was measured using a digital calliper. The axial resistance was calculated using the measured resistance and the geometric parameters. This procedure was repeated for each plant replica over a period of 75 days which enabled us to study the effects of age, growth media, diameter and length on the electrical response of the root segments of the selected plants. The growth medium was found to have a significant effect on the root electrical response, while the effect of root diameter on their electrical response was found to vary among the plants. More work is still required to further validate these results and also to develop better systems to study the electrical behaviour of root segments. Findings from our review entitled “an overview of the geophysical approach to root investigation”, suggest that SIP and EIT geophysical methods could be very useful for root investigations, thus more work is in progress to develop these systems for assessing the root electrical response at various scales. [less ▲]

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See detaille travail en question
Nisen, Laurent ULg

Speech/Talk (2017)

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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)

Detailed reference viewed: 22 (0 ULg)
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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See detailHybrid places : a conceptual framework
Uyttebrouck, Constance ULg; Teller, Jacques ULg

Poster (2017, April 27)

Detailed reference viewed: 16 (3 ULg)