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See detailLa dynastie belge et la science, 1909-1959
Pirot, Pascal ULg

Doctoral thesis (2015)

The project consists in investigating the role of the Belgian dynasty in scientific development since the beginning of the reign of king Albert I (1909), until the establishment of the National Council ... [more ▼]

The project consists in investigating the role of the Belgian dynasty in scientific development since the beginning of the reign of king Albert I (1909), until the establishment of the National Council for Science Policy (CNPS) in 1959, during king Baudouin's reign, following the publication of the work of the "National Commission on Science" which released its conclusions in the same year. The study deals with the action of the sovereign and the networks he formed with his entourage (the queen, the crown prince, the advisers of the court, some close relations of the king, the ministers in charge of scientific affairs) in the field of science, along various research themes; how these people saw the role of science in society; what influence they had in the development of science (institutions, initiatives, projects); what relationships existed between the dynasty and the scientific institutions; what the relationships between the dynasty and the Congo were in the realm of science. This perspective, which focuses on three Belgian sovereigns of the twentieth century, should make it possible to assess the development and progressive implementation of the "science policy". To date, no study has been specifically devoted to this topic. [less ▲]

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See detailEnergetics and Structural Characterization of Isomers Using Ion Mobility and Gas-phase H/D Exchange: Learning from Lasso Peptides
Hanozin, Emeline ULg; Morsa, Denis ULg; De Pauw, Edwin ULg

in Proteomics (2015), online accepted paper

State-of-the-art characterization of proteins using mass spectrometry namely relies on fragmentation methods which allows exploring featured dissociative reaction pathways. These pathways are often ... [more ▼]

State-of-the-art characterization of proteins using mass spectrometry namely relies on fragmentation methods which allows exploring featured dissociative reaction pathways. These pathways are often initiated by a series of potentially informative mass-constant conformational changes that are nonetheless frequently overlooked by lack of adequate investigation techniques. In the present study, we propose a methodology to readily address both structural and energetic aspects of stereoisomerization reactions using ion mobility coupled with mass spectrometry. To this end, a commercial spectrometer was used as a reactor comprising an energy resolved collisional activation step intended at promoting controlled conformational changes and a structural assignment step dedicated to the identification of the generated isomers. This identification relies on ion mobility and other on-line coupled techniques, namely an originally designed gas-phase H/D exchange experiment. We here apply this methodology to characterize the isomerization kinetics of capistruin, a 19-residue long lasso-folded peptide. We expect this approach to bring insights into the physical origin of global dissociation thresholds monitored in tandem mass spectrometry experiments and to set a promising basis for quantitative investigations of the stability of different molecular folds. [less ▲]

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See detailInternal dynamics, innovation and investments in sustainability
Crutzen, Nathalie ULg; Rammal, Hussain; Burritt, Roger

Conference (2015, March 26)

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See detailEditing a Multilingual Corpus of Letters. A Methodological Approach
Valenti, Gianluca ULg

Conference (2015, March 26)

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See detailDétection de l'érosion dans un bassin versant agricole par comparaison d'images multidates acquises par drone
Lisein, Jonathan ULg; Pineux, Nathalie ULg; Pierrot-Deseilligny, marc et al

Scientific conference (2015, March 26)

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See detailSobre la importancia de los escritores: un ejemplo de apariencia contrafactual
Ceballos Viro, Alvaro ULg

Scientific conference (2015, March 26)

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See detailGigantism, acromegaly, and GPR101 mutations.
Daly, Adrian ULg; Trivellin, Giampaolo; Stratakis, Constantine

in New England Journal of Medicine (2015), 372(13), 1265

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See detailApplications of stable isotopes in environmental studies at the University of Liege
Sturaro, Nicolas ULg; Borges, Alberto ULg; Das, Krishna ULg et al

Poster (2015, March 26)

Measurement and use of stable isotope ratios have a long history at the University of Liege (Belgium). Since at least 30 years, applications of stable isotopes in marine ecosystems have been developed ... [more ▼]

Measurement and use of stable isotope ratios have a long history at the University of Liege (Belgium). Since at least 30 years, applications of stable isotopes in marine ecosystems have been developed within the Laboratory of Oceanology and, more recently, within the Chemical Oceanography Unit. In the Laboratory of Oceanology, one research axis is the measurement of stable isotope composition (C, N, S) in organic matter to delineate trophic web structure and to study animal diet, their trophic niches and their alteration by human activities. This methodology has been successively applied worldwide in different habitats and ecosystems (marine, freshwater, terrestrial) in temperate and tropical areas. Mediterranean food web and fish trophic ecology have received a particular attention. Coupling between trophic ecology and ecotoxicology is another area of investigation. This has been applied mainly to marine vertebrates and freshwater ecosystems. Stable isotope labelling is also used in our laboratory to study and quantify various ecological processes such as inorganic nitrogen incorporation and trophic transfers. The laboratory facilities, renewed in 2012 and managed by Dr. Gilles Lepoint, are composed of an elemental analyser (EA, vario MICRO cube, Elementar) and a gas chromatography (GC, Agilent) coupled to an isotope ratio mass spectrometer (IRMS, Isoprime 100). The GC is also equipped with a quadrupole mass spectrometer. In 2014, the Chemical Oceanography Unit, headed by Dr. Alberto Borges, has acquired and implemented an off-axis cavity ring-down spectroscopy (CRDS) for the measurements of δ15Nα, δ15Nβ, δ18O of N2O. This enables characterization of the N2O origin in a variety of aquatic environments including groundwater in Wallonia, rivers and lakes in Wallonia and Africa, coastal environments (Scheldt estuary, Lake Grevelingen, North Sea), Mediterranean seagrass beds, and Antarctic and Arctic sea-ice. [less ▲]

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See detailThe development of mobility controls
Crutzen, Nathalie ULg; Qian, Wei

Conference (2015, March 26)

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See detailUse of C, N and S stable isotope ratios to highlight resource segregation among hermit crabs from tropical seagrass meadows
Michel, Loïc ULg; Frederich, Bruno ULg; Lavitra, Thierry et al

Poster (2015, March 26)

Polyspecific seagrass meadows are ubiquitous features of tropical coastal zones. These ecosystems are of critical ecological importance, and provide a wide range of socio-economical services to local ... [more ▼]

Polyspecific seagrass meadows are ubiquitous features of tropical coastal zones. These ecosystems are of critical ecological importance, and provide a wide range of socio-economical services to local populations. Meadows however undergo multiple threats linked to human activities (increased nutrient input, overfishing, invertebrate overharvesting, etc.). It is currently hard to assess how seagrass meadows could respond to anthropogenic impacts due to poor knowledge of their functional ecology. In an effort to unravel trophic interactions ruling the food webs associated to seagrass beds of the Toliara Great Reef (SW Madagascar), we studied resource segregation between two common Diogenidae hermit crabs (Dardanus scutellatus and Ciliopagurus tricolor) using stable isotope ratios. C, N and S stable isotope ratios of bulk muscle tissue were measured via CF-EA-IRMS (Elementar Vario MicroCube EA coupled to an Isoprime 100 MS). Interspecific differences were noted in isotopic composition of carbon (δ13C = -12.22 ± 1.73 ‰ for D. scutellatus, δ13C = -14.55 ± 0.73 ‰ for C. tricolor), nitrogen (δ15N = 4.73 ± 0.53 ‰ for D. scutellatus, δ15N = 5.20 ± 0.61 ‰ for C. tricolor) and sulfur (δ34S = 14.08 ± 2.32 ‰ for D. scutellatus, δ34S = 16.73 ± 1.49 ‰ for C. tricolor), suggesting that the two species do not feed on the same items. In addition, SIBER (Stable Isotope Bayesian Ellipses in R) modeling based on C and N data clearly showed that no overlap was present in the core isotopic niches of the two species. It also indicated that the isotopic niche of D. scutellatus was greater than the one of C. tricolor, implying that the former feeds on a greater number of items than the latter. While hermit crabs are generally considered as omnivorous species, this study highlighted differences in the foraging ecology of D. scutellatus and C. tricolor. These differences could help to limit competition for food between these two species, and facilitate their coexistence in Malagasy seagrass beds. [less ▲]

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See detailA doublescale model for hydromechanical coupling in clay rocks
van den Eijnden, Abraham Pieter ULg; Bésuelle, Pierre; Collin, Frédéric ULg et al

Conference (2015, March 26)

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See detailLa simulation thermo-aéraulique du bâtiment : Validation et développement d’une approche couplée CFD-Multizone pour l’étude de la modélisation du phénomène de surchauffe estivale en Belgique
Barbason, Mathieu ULg

Doctoral thesis (2015)

For decades, growing interests in environmental and buildings energy performance concerns lead architects and building engineers to develop new skills and to get used to advanced simulation tools. Among ... [more ▼]

For decades, growing interests in environmental and buildings energy performance concerns lead architects and building engineers to develop new skills and to get used to advanced simulation tools. Among them, Multizone models and Computational Fluid Dynamics (CFD) models are increasingly used to solve problems of building physics. This Thesis reports the development of a new and optimized tool based on the coupling of these two tools and its application to a typical Belgian two-storey house. Indeed, separately, these two tools have significant advantages and disadvantages : • Multizone models are based on the hypothesis that the temperature is uniform in every simulated zone which implies that they are not suited for large spaces. However, in small spaces, Multizone models generate accurate results in a small amount of time. • CFD models are very accurate, independently of the size of the room or the type of physical phenomena encountered. However, it is also well known that CFD simulation are time and resources consuming. Consequently, it is not possible to use it for a long term study. This Thesis will first introduce these approaches and discuss their validity field. In order to do this, a validation process has been developed to assess the ability of CFD to model accurately physical phenomena at different study scales. This Thesis will then discuss the coupling scheme developed in this study, based on experimental results of a two-storey house in Belgium. Different coupling level will be studied in order to understand deeply needs of such approach. Eventually, it will be shown that coupling approach can drastically improve overheating prediction for buildings even for a long term simulation. Thanks to this new tool, building actors may design optimized cooling strategies while maximizing occupants comfort. [less ▲]

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See detailModelling the excavation damaged zone in Callovo-Oxfordian claystone using shear strain localisation
Pardoen, Benoît ULg; Levasseur, Séverine; Collin, Frédéric ULg et al

Conference (2015, March 26)

see attached abstract

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See detailDroit du travail congolais face à l'usage des technologies de l'information et de la communication: la problématique de nouveaux défis
Mbungu Tsende, Lievin ULg

Doctoral thesis (2015)

La thèse s’intéresse, d’une part, aux bouleversements entraînés par les technologies de l’information et de la communication dans le monde du travail congolais et, d’autre part, aux solutions qu’ils ... [more ▼]

La thèse s’intéresse, d’une part, aux bouleversements entraînés par les technologies de l’information et de la communication dans le monde du travail congolais et, d’autre part, aux solutions qu’ils appellent compte tenu du contexte socioculturel, économique, psychologique et technologique propre à la R.D.Congo. Il s’agit d’une étude qui tend non seulement à démontrer que le contexte actuel, marqué par l’emprise irréversible des TIC sur les relations de travail, remet partiellement en cause le cadre juridique et le modèle classique ou traditionnel congolais de réglementation des rapports entre employeur et travailleur, mais aussi à proposer, de lege ferenda, les aménagements susceptibles de remédier à cette situation. [less ▲]

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See detailUsing XCO2 retrievals for assessing the long-term consistency of NDACC/FTIR data sets
Barthlott, S; Schneider, M; Hase, F et al

in Atmospheric Measurement Techniques (2015), 8

Within the NDACC (Network for the Detection of Atmospheric Composition Change), more than 20 FTIR (Fourier-transform infrared) spectrometers, spread worldwide, provide long-term data records of many ... [more ▼]

Within the NDACC (Network for the Detection of Atmospheric Composition Change), more than 20 FTIR (Fourier-transform infrared) spectrometers, spread worldwide, provide long-term data records of many atmospheric trace gases. We present a method that uses measured and modelled XCO2 for assessing the consistency of these NDACC data records. Our XCO2 retrieval setup is kept simple so that it can easily be adopted for any NDACC/FTIR-like measurement made since the late 1950s. By a comparison to coincident TCCON (Total Carbon Column Observing Network) measurements, we empirically demonstrate the useful quality of this suggested NDACC XCO2 product (empirically obtained scatter between TCCON and NDACC is about 4‰ for daily mean as well as monthly mean comparisons, and the bias is 25 ‰). Our XCO2 model is a simple regression model fitted to CarbonTracker results and the Mauna Loa CO2 in situ records. A comparison to TCCON data suggests an uncertainty of the model for monthly mean data of below 3 ‰. We apply the method to the NDACC/FTIR spectra that are used within the project MUSICA (multi-platform remote sensing of isotopologues for investigating the cycle of atmospheric water) and demonstrate that there is a good consistency for these globally representative set of spectra measured since 1996: the scatter between the modelled and measured XCO2 on a yearly time scale is only 3 ‰. [less ▲]

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See detailFerromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites
Bristowe, Nicholas ULg; Varignon, Julien ULg; Fontaine, Denis et al

in Nature Communications (2015), 6

In magnetic materials, the Pauli exclusion principle typically drives anti-alignment between electron spins on neighbouring species resulting in antiferromagnetic behaviour. Ferromagnetism exhibiting ... [more ▼]

In magnetic materials, the Pauli exclusion principle typically drives anti-alignment between electron spins on neighbouring species resulting in antiferromagnetic behaviour. Ferromagnetism exhibiting spontaneous spin alignment is a fairly rare behaviour, but once materialized is often associated with itinerant electrons in metals. Here we predict and rationalize robust ferromagnetism in an insulating oxide perovskite structure based on the popular titanate series. In half-doped layered titanates, the combination of Jahn–Teller and oxygen breathing motions opens a band gap and creates an unusual charge and orbital ordering of the Ti d electrons. It is argued that this intriguingly intricate electronic network favours the elusive inter-site ferromagnetic (FM) ordering, on the basis of intra-site Hund's rules. Finally, we find that the layered oxides are also ferroelectric with a spontaneous polarization approaching that of ​BaTiO3. The concepts are general and design principles of the technologically desirable FM ferroelectric multiferroics are presented. [less ▲]

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See detailInvestir et gérer le transport public urbain ?
Gautier, Axel ULg

Conference given outside the academic context (2015)

Detailed reference viewed: 14 (1 ULg)