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See detailDÉTECTION ET QUANTIFICATION DES RACINES ET DES RÉSIDUS DE CULTURE DE FROMENT D’HIVER (TRITICUM AESTIVUM L.) PAR IMAGERIE HYPERSPECTRALE PROCHE INFRAROUGE
Fraipont, Guillaume ULg

Master's dissertation (2015)

On the basis of 384 soil samples collected at 4 different dates during the 2011-2012 crop season in the 0-30 cm soil horizon, this master thesis allowed the study of crop residues evolution and the ... [more ▼]

On the basis of 384 soil samples collected at 4 different dates during the 2011-2012 crop season in the 0-30 cm soil horizon, this master thesis allowed the study of crop residues evolution and the development of winter wheat root system throughout the crop season by the means of NIR-HSI technology and chemometric tools. [less ▲]

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See detailThe study of air-ice CO2 exchange emphasize the importance of gas bubble transport during sea ice growth
Kotovitch, Marie ULg; Moreau, Sébastien; Zhou, Jiayun et al

Poster (2015, August 20)

We report air-ice CO2 fluxes measured continuously using automated chambers over artificial sea ice from freezing to decay. We observed an uptake of CO2 as seawater was cooling down prior to sea ice ... [more ▼]

We report air-ice CO2 fluxes measured continuously using automated chambers over artificial sea ice from freezing to decay. We observed an uptake of CO2 as seawater was cooling down prior to sea ice formation. As soon as the first ice crystals started to form, we observed a shift from a sink to a source. Sea ice released CO2 until we initiated the ice decay by warming the atmosphere. Sea ice then returned to be a CO2 sink. Direct measurements of the fluxes were consistent with the depletion of dissolved inorganic carbon in sea ice. Measurements of bulk partial pressure of CO2 in sea ice and of atmospheric CO2 allowed us to assess a gas exchange coefficient for CO2 at the air-sea ice interface during the grow stage. We compared these observations with a 1D biogeochemical model. Discrepancies between the model and the observations lead us to emphasize the role of gas bubbles in CO2 transport through sea ice. [less ▲]

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See detailUltrafast and Distinct Spin Dynamics in Magnetic Alloys
Radu, I.; Stamm, C.; Eschenlohr, A. et al

in Spin (2015), 5(3), 1550004

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See detailDetection of anthropogenic particles in fish stomachs: an isolation method adapted to identification by Raman spectroscopy
Collard, France ULg; Gilbert, Bernard ULg; Eppe, Gauthier ULg et al

in Archives of Environmental Contamination & Toxicology (2015), 69

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See detailOccupational stress among textile workers in the Democratic Republic of Congo
Panda Lukongo, Kitronza ULg; Mairiaux, Philippe ULg

in Tropical Medicine and Health (2015), Tropical Medicine and Health , 2015,(Vol. 43 No.4), 223231

Context: In the Democratic Republic of Congo (DRC), scientific studies on occupational health are scarce. The present study aims at estimating the level of occupational stress, as well as associated ... [more ▼]

Context: In the Democratic Republic of Congo (DRC), scientific studies on occupational health are scarce. The present study aims at estimating the level of occupational stress, as well as associated factors, in a textile company. Methods: We performed a cross-sectional survey among textile workers in DRC. Data (N= 192 subjects) were collected through a self-questionnaire validated for the assessment of stress (Karasek and Siegrist’s scale); supplemented by a medical examination. Frequencies and odds ratios (ORs) were estimated for descriptive analyses. Adjusted ORs were calculated through a logistic regression model to investigate associations between socio-demographic and organisational variable and stress. Results: Our study highlighted a high level of stress among individuals: 28% of them were suffering from stress, according to Karasek, and 22%, when applying Siegrist’s model. A 14%-isostrain was calculated when considering all workers. A statistically significant association was observed between stress and age, seniority and perceived no-adaptation to work, considering both approaches. Furthermore, when job strain was determined according to Karasek, it was related to the status of worker, the poor perception of organisation and alcohol consumption, while stress estimated by applying Siegrist’s model showed an association with education level and the occurrence of cardiac symptoms. Conclusion: The present study gives evidence of stress among individuals through both models. Several socio-professional factors are associated with stress, which determines populations at risk. The study revealed that both stress models offer complementary information, thus increasing the probability to model workers’ health more exactly and to make recommendations on prevention and management. [less ▲]

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See detailTwo differentiation trends and parent magmas at Calbuco volcano (CSVZ, Chille)
Montalbano, Salvatrice ULg; Schiano, Pierre; Cluzel, Nicolas et al

Poster (2015, August 19)

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See detailUSING OF AN EXPERIMENTAL DESIGN TO CHARACTERIZE THE CONVECTIVE DRYING BEHAVIOR OF DIFFERENT SLUDGES
Fraikin, Laurent ULg; Salmon, Thierry ULg; Herbreteau, Benjamin et al

in Drying Technology (2015, August 18), 33(11), 1302-1308

Drying appears as a major step prior to valorization of sludge from wastewater treatment plant. This study uses an experimental design on different sludges to highlight the drying behavior according to ... [more ▼]

Drying appears as a major step prior to valorization of sludge from wastewater treatment plant. This study uses an experimental design on different sludges to highlight the drying behavior according to drying conditions, storage and extrusion. This research is performed with industrial view, but on a single cylinder sample, and focuses on five responds: maximum drying flux, time to reach 95% of dry matter, final volume, critical moisture and slowing-down coefficient. [less ▲]

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See detailCentury-scale simulations of the response of the West Antarctic Ice Sheet to a warming climate
Cornford, S.L.; Martin, D.F.; Payne, A.J. et al

in Cryosphere (The) (2015), 9

We use the BISICLES adaptive mesh ice sheet model to carry out one, two, and three century simulations of the fast-flowing ice streams of the West Antarctic Ice Sheet, deploying sub-kilometer resolution ... [more ▼]

We use the BISICLES adaptive mesh ice sheet model to carry out one, two, and three century simulations of the fast-flowing ice streams of the West Antarctic Ice Sheet, deploying sub-kilometer resolution around the grounding line since coarser resolution results in substantial underestimation of the response. Each of the simulations begins with a geometry and velocity close to present-day observations, and evolves according to variation in meteoric ice accumulation rates and oceanic ice shelf melt rates. Future changes in accumulation and melt rates range from no change, through anomalies computed by atmosphere and ocean models driven by the E1 and A1B emissions scenarios, to spatially uniform melt rate anomalies that remove most of the ice shelves over a few centuries. We find that variation in the resulting ice dynamics is dominated by the choice of initial conditions and ice shelf melt rate and mesh resolution, although ice accumulation affects the net change in volume above flotation to a similar degree. Given sufficient melt rates, we compute grounding line retreat over hundreds of kilometers in every major ice stream, but the ocean models do not predict such melt rates outside of the Amundsen Sea Embayment until after 2100. Within the Amundsen Sea Embayment the largest single source of variability is the onset of sustained retreat in Thwaites Glacier, which can triple the rate of eustatic sea level rise. [less ▲]

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See detailOrganometallic-mediated radical polymerization for the precision design of novel poly(ionic liquid) copolymers in water
Cordella, Daniela ULg; Kermagoret, Anthony; Debuigne, Antoine ULg et al

Conference (2015, August 18)

In recent years, poly(ionic liquid)s (PIL)s were found to take an enabling role in important fields of polymer chemistry and material science. PILs combine the unique properties of ionic liquids with the ... [more ▼]

In recent years, poly(ionic liquid)s (PIL)s were found to take an enabling role in important fields of polymer chemistry and material science. PILs combine the unique properties of ionic liquids with the flexibility and properties of macromolecular architectures giving rise to a new family of functional polymers that opens new area of applications such as polymer electrolytes in electrochemical devices, powerful dispersants and stabilizers, absorbing membranes, precursors for carbon materials, porous polymers, etc. Controlled radical polymerization techniques have recently emerged as powerful tools for the precision design of novel PILs architectures and functionalities, enabling a considerable extension of the applications of PILs with the emergence of new properties. Many efforts are devoted to tentatively control the radical polymerization of ionic liquid monomers (ILs) that directly leads to PILs without requiring further polymer derivatization. Poly(vinyl imidazolium)s belong to a class of PILs of high interest but the control radical polymerization of their corresponding monomer is touchy due to the high reactivity of their propagating radical. In this communication, we will report on the implementation of organometallic-mediated radical polymerization (OMRP) technique for the precision synthesis of unprecedented PILs (co)polymers by direct polymerization of ILs in water. We will first discuss how a commercially available cobalt complex can efficiently control the growth of poly(vinyl imidazolium) chains and lead to PILs with predicted molar masses and low dispersities under mild experimental conditions. The efficiency of the process will then be illustrated by the one-pot synthesis of vinyl imidazolium-based block copolymers in aqueous media. This OMRP technique, highly compatible to water and active under moderate temperatures (30-40°C), is unique for providing well-defined vinyl imidazolium based-copolymers and novel PILs assemblies, and open new application fields. [less ▲]

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See detailSeeing Central African forests through their largest trees
Bastin, Jean-François ULg; Barbier, Nicolas; Réjou-Méchain, Maxime et al

in Scientific Reports (2015)

Large tropical trees and a few dominant species were recently identified as the main structuring elements of tropical forests. However, such result did not translate yet into quantitative approaches which ... [more ▼]

Large tropical trees and a few dominant species were recently identified as the main structuring elements of tropical forests. However, such result did not translate yet into quantitative approaches which are essential to understand, predict and monitor forest functions and composition over large, often poorly accessible territories. Here we show that the above-ground biomass (AGB) of the whole forest can be predicted from a few large trees and that the relationship is proved strikingly stable in 175 1-ha plots investigated across 8 sites spanning Central Africa. We designed a generic model predicting AGB with an error of 14% when based on only 5% of the stems, which points to universality in forest structural properties. For the first time in Africa, we identified some dominant species that disproportionally contribute to forest AGB with 1.5% of recorded species accounting for over 50% of the stock of AGB. Consequently, focusing on large trees and dominant species provides precise information on the whole forest stand. This offers new perspectives for understanding the functioning of tropical forests and opens new doors for the development of innovative monitoring strategies. [less ▲]

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See detailLe remplacement des F-16 belges : une analyse exploratoire
Dumoulin, André ULg; Henrotin, Joseph; Struys, Wally

Report (2015)

Ce rapport indépendant analyse les tenants et les aboutissants du débat actuel sur le choix d'un remplaçant aux chasseurs-bombardiers F-16 de la composante aérienne belge, dans ses aspects stratégiques ... [more ▼]

Ce rapport indépendant analyse les tenants et les aboutissants du débat actuel sur le choix d'un remplaçant aux chasseurs-bombardiers F-16 de la composante aérienne belge, dans ses aspects stratégiques, technologiques, militaires, économiques et politiques [less ▲]

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See detailDesign of hybrid nanovehicles for remotely triggered drug release: an overview
Liu, Ji; Detrembleur, Christophe ULg; Mornet, Stéphane et al

in Journal of Materials Chemistry B (2015), 3(30), 6117-6147

n the past few decades, various nanovehicles have been developed as drug delivery systems, in which inorganic and organic components are integrated within a nano-object. Upon the application of remote ... [more ▼]

n the past few decades, various nanovehicles have been developed as drug delivery systems, in which inorganic and organic components are integrated within a nano-object. Upon the application of remote stimuli, e.g. alternating magnetic field, near infrared or ultrasound radiations, the release of guest molecules can be triggered in a quite controlled manner. Herein, we review different hybrid nanostructures which have already been reported for the remotely triggered release, such as those based on (1) host–guest conjugates, (2) core–corona nanoparticles, (3) polymer nanogels, (4) polymer micelles, (5) liposomes, (6) mesoporous silica particles and (7) hollow nanoparticles. Moreover, we also summarize six underlying mechanisms that govern such a kind of remotely triggered release behaviours: (1) enhanced diffusion and/or permeation, (2) thermo- or photo-labile bond cleavage, (3) fusion of phase-changed materials, (4) photo-induced isomerisation, (5) thermo-induced swelling/de-swelling of thermo-responsive polymers, and (6) destruction of the nanostructures. The ways in which different components are incorporated into an integrated hybrid nanostructure and how they contribute to the remotely triggered release behaviours are detailed. [less ▲]

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See detailLe fisc peut-il ou doit-il prendre en considération l'origine légale ou morale des revenus imposables?
Richelle, Isabelle ULg

Article for general public (2015)

Le fisc taxe des revenus illicites ou immoraux, mais qu'en est'il de la déductibilité frais de telle nature lorsqu'ils sont supportés en vue d'acquérir ou de conserver des revenus imposables?

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See detailNi-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg

Conference (2015, August 13)

Hydrodechlorination of chlorinated organics is a particularly attractive alternative compared with incineration of wastes from the chlorine industry from both economic and environmental points of view ... [more ▼]

Hydrodechlorination of chlorinated organics is a particularly attractive alternative compared with incineration of wastes from the chlorine industry from both economic and environmental points of view. Several authors demonstrated the ability of bimetallic catalysts, composed of metals from Groups VIII and IB, to convert chlorinated alkanes selectively into less or not chlorinated alkenes. The purpose of this study is to measure catalytic activity and selectivities of 1,2-dichloroethane hydrodechlorination over Ni-Cu/SiO2 cogelled xerogel catalysts and to study relationships between catalytic activity and surface properties of bimetallic catalysts. To understand the mechanism of hydrodechlorination of 1,2-dichloroethane on a supported alloy, the surface composition of Ni-Cu alloy is measured from H2 chemisorption, XRD and TEM. Values obtained indicate a very pronounced surface enrichment with copper. Samples containing various amounts of nickel and copper are xerogels prepared by a one-step sol-gel procedure, which consists in the cogelation of the silica precursor, tetraethoxysilane (TEOS), with organically substituted alkoxides capable of forming chelates with nickel and copper ions. The resulting alcogels were dried under vacuum at 80°C, calcined in air at 400°C, and finally reduced in hydrogen at 450°C. For each catalytic experiment, 0.11 g of catalyst pellets were tested. The temperature was successively kept at 200, 250, 300, 350 and 300°C. While 1,2-dichloroethane hydrodechlorination over pure nickel mainly produces ethane, increasing copper content in bimetallic catalysts results in an increase in ethylene selectivity. Used alone, copper deactivates rapidly due to their covering by chlorine atoms. When nickel is present, it supplies hydrogen atoms for the regeneration of the chlorinated copper surfaces into metallic copper. The specific consumption rate of 1,2-dichloroethane decreases when copper loading increases. The turnover frequency, that is, the number of catalytic cycle per active site (nickel atom and its surrounding copper atoms) and per second, seems to be independent of surface composition of alloy particles. [less ▲]

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See detailAll Poly(ionic liquid)-based block copolymers by sequential controlled radical copolymerization of vinylimidazolium monomers
Cordella, Daniela ULg; Kermagoret, Anthony; Debuigne, Antoine ULg et al

in Macromolecules (2015), 48(15), 5230-5243

The organometallic-mediated radical polymerization (OMRP) of N-vinyl-3-alkylimidazolium-type monomers, featuring the bis(trifluoromethylsulfonyl)imide counteranion (Tf2N–), in the presence of Co(acac)2 as ... [more ▼]

The organometallic-mediated radical polymerization (OMRP) of N-vinyl-3-alkylimidazolium-type monomers, featuring the bis(trifluoromethylsulfonyl)imide counteranion (Tf2N–), in the presence of Co(acac)2 as controlling agent, is reported. Polymerizations of monomers with methyl, ethyl, and butyl substituents are fast, reaching high monomer conversion in ethyl acetate as solvent at 30 °C, and afford structurally well-defined hydrophobic poly(ionic liquid)s (PILs) of N-vinyl type. Block copolymer synthesis is also achieved by sequential OMRP of N-vinyl-3-alkylimidazolium salts carrying different alkyl chains and different counteranions (Tf2N– or Br–). These block copolymerizations are carried out at 30 °C, either under homogeneous solution in methanol or in a biphasic medium consisting of a mixture of ethyl acetate and water. Unprecedented PIL-b-PIL block copolymers are thus prepared under these conditions. However, anion exchange occurs at the early stage of the growth of the second block. Finally, diblock copolymers generated in the biphasic medium can be readily coupled by addition of isoprene, forming all PIL-based and symmetrical ABA-type triblock copolymers in a one-pot process. Such a direct block copolymerization method, involving vinylimidazolium monomers bearing different alkyl chains, thus opens new opportunities in the precision synthesis of all PIL-based block copolymers of tunable properties. [less ▲]

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See detailInterlaboratory study to evaluate the robustness of capillary electrophoresis-mass spectrometry for peptide mapping
Wenz, Christian; Barbas, Coral; Lopez-Gonzalvez, Angeles et al

in Journal of Separation Science (2015)

A collaborative study on the robustness and portability of a capillary electrophoresis-mass spectrometry method for peptide mapping was performed by an international team, consisting of 13 independent ... [more ▼]

A collaborative study on the robustness and portability of a capillary electrophoresis-mass spectrometry method for peptide mapping was performed by an international team, consisting of 13 independent laboratories from academia and industry. All participants used the same batch of samples, reagents and coated capillaries to run their assays, whereas they utilized the capillary electrophoresis-mass spectrometry equipment available in their laboratories. The equipment used varied in model, type and instrument manufacturer. Furthermore, different types of sheath-flow capillary electrophoresis–mass spectrometry interfaces were used. Migration time, peak height and peak area of ten representative target peptides of trypsin-digested bovine serum albumin were determined by every laboratory on two consecutive days. The data were critically evaluated to identify outliers and final values for means, repeatability (precision within a laboratory) and reproducibility (precision between laboratories) were established. For relative migration time the repeatability was between 0.05 and 0.18% RSD and the reproducibility between 0.14 and 1.3% RSD. For relative peak area repeatability and reproducibility values obtained were 3–12 and 9–29% RSD, respectively. These results demonstrate that capillary electrophoresis-mass spectrometry is robust enough to allow a method transfer across multiple laboratories and should promote a more widespread use of peptide mapping and other capillary electrophoresis-mass spectrometry applications in biopharmaceutical analysis and related fields. [less ▲]

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See detailInnovating for the Public Good: the Rise of Social Entrepreneurs
Defourny, Jacques ULg

Conference given outside the academic context (2015)

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See detailLa presse vidéoludique francophone : formats (papier et numérique) et histoire
Dozo, Björn-Olav ULg

Conference (2015, August 11)

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See detailThe evolution of metal hyperaccumulation in Arabidopsis halleri
Hanikenne, Marc ULg

Scientific conference (2015, August 07)

Detailed reference viewed: 31 (1 ULg)