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See detailL'économie sociale: le risque caritatif d'un projet politique
Frère, Bruno ULg

Article for general public (2010)

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See detailEffect of an electric field on an intermittent granular flow
Mersch, Eric ULg; Lumay, Geoffroy ULg; Boschini, Frédéric ULg et al

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2010), 81

Granular gravity driven flows of glass beads have been observed in a silo with a flat bottom. A dc high electric field has been applied perpendicularly to the silo to tune the cohesion. The outlet mass flow ... [more ▼]

Granular gravity driven flows of glass beads have been observed in a silo with a flat bottom. A dc high electric field has been applied perpendicularly to the silo to tune the cohesion. The outlet mass flow has been measured. An image subtraction technique has been applied to visualize the flow geometry and a spatiotemporal analysis of the flow dynamics has been performed. The outlet mass flow is independent of voltage, but a transition from funnel flow to rathole flow is observed. This transition is of probabilistic nature and an intermediate situation exists between the funnel and the rathole situations. At a given voltage, two kinds of flow dynamics can occur: a continuous flow or an intermittent flow. The electric field increases the probability to observe an intermittent flow. [less ▲]

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See detailIMA Commission on New Minerals, Nomenclature and Classification (CNMNC), Newsletter 5
Williams, Pete; Hatert, Frédéric ULg; Pasero, Marco et al

in Mineralogical Magazine (2010), 74(5), 899-902

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See detailPortfolio professionnel : Projet personnel :Enseignement de la nutrition en médecine vétérinaire : un projet d'exercices en ligne visant à susciter l'apprentissage pré-clinique et l'autonomie
Diez, Marianne ULg

Learning material (2010)

Portfolio présentant l'enseignement et une innovation pédagogique sous forme de 2 articles

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See detailDECONSTRUCTION ARCHITECTURALE; PORTRAIT D’UN MONDE TEXTOCENTRIQUE. Approche théorique et philosophique d'un new paradigm, 1988 – 2010
Bodart, Céline ULg

Master's dissertation (2010)

L'enjeu de ce mémoire était d'approcher, à travers la pensée de la déconstruction derridienne, l'interdisciplinarité établie entre architecture et philosophie comme l'origine d'un travail subversif ... [more ▼]

L'enjeu de ce mémoire était d'approcher, à travers la pensée de la déconstruction derridienne, l'interdisciplinarité établie entre architecture et philosophie comme l'origine d'un travail subversif aujourd'hui responsable de la crise sémantique traversée par l'art de la construction. Nous avons donc, à travers un parcours historique, reconstruit la genèse de ce phénomène à partir des théories écrites par ses architectes protagonistes et réévalué la filiation qu'on leur attribuait avec la philosophie de Jacques Derrida. Ensuite, nous avons étudié comment la pression médiatique s'est emparée de cette « pseudo-théorie », simplifiant et caricaturant l'ambition de son véritable discours. En définitive, ce mémoire, portrait d'une architecture devenue tour à tour hôte et victime de la subversion, a tenu l'hypothèse de l'existence en architecture d'un glissement référentiel semblable à celui de l'art vers le non-art. Nous avons tenté de démontrer que la déconstruction, se faisant expérience architecturale, a redessiné la carte des limites disciplinaires traditionnellement tenues par l'art de la construction. [less ▲]

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See detailThe net biome production of full crop rotations in Europe
Kutsch, W. L.; Aubinet, Marc ULg; Buchmann, N. et al

in Agriculture, Ecosystems & Environment (2010), 139

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See detailCes nombres qu'on dit imaginaires sont-ils des nombres ?
Rosseel, Hilda; Schneider-Gilot, Marguerite ULg

Book published by Presses Universitaires de Liège (2010)

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See detailTransition probabilities of astrophysican interest in the niobium ions (Nb II and Nb III)
Nilsson, H.; Hartman, H.; Engström, L. et al

in Astronomy and Astrophysics (2010)

Aims. We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of Nb ii and Nb iii and determine the niobium abundance in the Sun and metal-poor stars rich in ... [more ▼]

Aims. We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of Nb ii and Nb iii and determine the niobium abundance in the Sun and metal-poor stars rich in neutron-capture elements. Methods. We used the time-resolved laser-induced fluorescence technique to measure radiative lifetimes in Nb ii. Branching fractions were measured from spectra recorded using Fourier transform spectroscopy. The radiative lifetimes and the branching fractions were combined yielding transition probabilities. In addition, we calculated lifetimes and transition probablities in Nb ii and Nb iii using a relativistic Hartree-Fock method that includes core polarization. Abundances of the sun and five metal-poor stars were derived using synthetic spectra calculated with the MOOG code, including hyperfine broadening of the lines. Results. We present laboratory measurements of 17 radiative lifetimes in Nb ii. By combining these lifetimes with branching fractions for lines depopulating the levels, we derive the transition probabilities of 107 Nb ii lines from 4d35p configuration in the wavelength region 2240−4700 Å. For the first time, we present theoretical transition probabilities of 76 Nb III transitions with wavelengths in the range 1430−3140 Å. The derived solar photospheric niobium abundance log = 1.44 ± 0.06 is in agreement with the meteoritic value. The stellar Nb/Eu abundance ratio determined for five metal-poor stars confirms that the r-process is a dominant production method for the n-capture elements in these stars. [less ▲]

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See detailProduction d'oligosaccharides à partir de gomme de caroube
Simon, Mathilde ULg

Master's dissertation (2010)

The general framework of this study is the discovery of prebiotics and more specifically the production of oligosaccharides by enzymatic hydrolysis of locust bean gum. These, though not much studied ... [more ▼]

The general framework of this study is the discovery of prebiotics and more specifically the production of oligosaccharides by enzymatic hydrolysis of locust bean gum. These, though not much studied, could present a rich prebiotics potential. The aim of this work was the purification of beta-mannanases located in germinating carob seeds as well as the validation of a AEC-PAD method applicable to the analysis of locust bean gum hydrolysates. Therefore, it has permitted to establish a concentration and purification procedure of beta-mannanases and to determine a suitable preservation method of enzymatic extracts. An original method to evaluate the enzymatic activity by viscosity measurements has also been developed and permits the study of the evolution of enzymatic activities during germination. The validation method of characterization and quantification of (galacto)-manno-oligosaccharides constitutes the last part studied. Seven performance criteria calculated for each of the nine standards were used to validate the method. It has then been used to analyze locust bean gum hydrolysates. The results of this work are the first of a new research theme. They offer many opportunities and future applications. [less ▲]

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See detailTowards calibration and characterization of high-energy beams using charged particle retrodiffusion on a double thin carbon foil system
Chene, Grégoire ULg; Mathis, François ULg; Dupuis, Thomas ULg et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2010), 268(11-12), 2015-2018

The cyclotron of the IPNAS-CEA laboratory of the University of Liege (Belgium) has built a new high-energy, high-resolution beam line based on the use of a pair of 900 bending magnets showing a energy ... [more ▼]

The cyclotron of the IPNAS-CEA laboratory of the University of Liege (Belgium) has built a new high-energy, high-resolution beam line based on the use of a pair of 900 bending magnets showing a energy resolution of Delta E = 1.9 +/- 0.4 keV comparable to that of electrostatic IBA installations. In the 6-20 MeV energy range the contribution of non-Rutherford events to scattering spectra became important and are not very well known. In order to improve our knowledge in that field, a new vacuum chamber especially dedicated to differential cross-section measurements has been constructed. First results obtained with the new set-up are presented. (C) 2010 Elsevier B.V. All rights reserved. [less ▲]

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See detailA non-destructive testing application solved with A-X geometric eddy-current formulation
Codecasa, Lorenzo; Dular, Patrick ULg; Specogna, Ruben et al

in COMPEL (2010), 29(6), 1606-1615

Purpose – The purpose of this paper is to introduce a perturbation method for the A-X geometric formulation to solve eddy-current problems and apply it to the feasibility design of a non-destructive ... [more ▼]

Purpose – The purpose of this paper is to introduce a perturbation method for the A-X geometric formulation to solve eddy-current problems and apply it to the feasibility design of a non-destructive evaluation device suitable to detect long-longitudinal volumetric flaws in hot steel bars. Design/methodology/approach – The effect of the flaw is accurately and efficiently computed by solving an eddy-current problem over an hexahedral grid which gives directly the perturbation due to the flaw with respect to the unperturbed configuration. Findings – The perturbation method, reducing the cancelation error, produces accurate results also for small variations between the solutions obtained in the perturbed and unperturbed configurations. This is especially required when the tool is used as a forward solver for an inverse problem. The method yields also to a considerable speedup: the mesh used in the perturbed problem can in fact be reduced at a small fraction of the initial mesh, considering only a limited region surrounding the flaw in which the mesh can be refined. Moreover, the full three-dimensional unperturbed problem does not need to be solved, since the source term for computing the perturbation is evaluated by solving a two-dimensional flawless configuration having revolution symmetry. Originality/value – A perturbation method for the A-X geometric formulation to solve eddy-current problems has been introduced. The advantages of the perturbation method for non-destructive testing applications have been described. [less ▲]

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See detailWater table mapping using Bayesian data fusion with auxiliary data
Fasbender, Dominique; Bogaert, Patrick; Peeters, Luk et al

in Water 2010 symposium, International Symposium on Stochastic Hydraulics (2010)

Water table elevations are usually sampled in space using piezometric measurements, that are unfortunately both expensive to drill and monitor and consequently are thus scarce over space. Most of the time ... [more ▼]

Water table elevations are usually sampled in space using piezometric measurements, that are unfortunately both expensive to drill and monitor and consequently are thus scarce over space. Most of the time, piezometric data are sparsely distributed over large areas, thus providing limited direct information about the level of the corresponding water table. As a consequence, there is a real need for approaches that are able at the same time to (i) provide spatial predictions at unsampled locations and (ii) enable the user to account in a meaningful way for all potentially available secondary information sources that are in some way related to water table elevations. Advantages of these auxiliary information sources are their cheapest prices and their better spatial coverage, thus allowing the user to improve the quality of subsequent mapping provide that a meaningful way of merging these data is made available. In this paper, a recently developed Bayesian Data Fusion technique (BDF) is applied to the problem of water table spatial mapping. After a brief presentation of the underlying theory, specific assumptions are made and discussed in order to account for a digital elevation model as well as for the geometry of a corresponding river network. Based on a data set for the Dyle basin in the north part of Belgium, the suggested model is then implemented by accounting for two secondary information sources, i.e., a spatially exhaustive high resolution digital elevation model and a metric allowing us to account for the whole geometry of the river network as auxiliary information. Results are compared to those of standard spatial mapping techniques like ordinary kriging and cokriging. Respective accuracies and precisions of these estimators are finally evaluated using a leave-one-out cross-validation procedure. They show one one side the obvious benefit of incorporating additional information sources, but more interesting they also emphasize the limitations of traditional multivariate methods (like, e.g., cokriging methods) that fail to efficiently take benefit of these addditional information due to restrictive modeling hypotheses, whereas BDF has no difficulty on that side. Though the BDF methodology was illustrated here for the integration of only two secondary information sources, the method can also be applied for incorporating an arbitrary number of auxiliary variables. It has also been successfully applied in other fields like remote-sensing and air pollution, thus opening new avenues for the important and general topic of data integration in a spatial mapping context. Extension towards a space-time context for dynamic mapping is also possible. [less ▲]

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See detailElectrically addressing a molecule-like donor pair in silicon: An atomic scale cyclable full adder logic
YAN, Yonghong; Mol, J. A.; Verduijn, J. et al

in Journal of Physical Chemistry C: Nanomaterials, Interfaces, and Hard Matter (2010), 114

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See detailAnalysis of the high affinity IgE receptor genes reveals epistatic effects of FCER1A variants on eczema risk
Mahachie John, Jestinah ULg; Baurecht, H.; Rodriguez, E. et al

in Allergy (2010), 65(7), 875-882

To cite this article: Mahachie John JM, Baurecht H, Rodriguez E, Naumann A, Wagenpfeil S, Klopp N, Mempel M, Novak N, Bieber T, Wichmann H-E, Ring J, Illig T, Cattaert T, Van Steen K, Weidinger S ... [more ▼]

To cite this article: Mahachie John JM, Baurecht H, Rodriguez E, Naumann A, Wagenpfeil S, Klopp N, Mempel M, Novak N, Bieber T, Wichmann H-E, Ring J, Illig T, Cattaert T, Van Steen K, Weidinger S. Analysis of the high-affinity IgE receptor genes reveals epistatic effects of FCER1A variants on total IgE levels and eczema risk. Allergy 2009; DOI: 10.1111/j.1398-9995.2009.02297.x. Abstract Background: High levels of total and allergen-specific IgE levels are a key feature in allergic diseases. The high-affinity receptor for IgE, which is composed of one alpha (FCER1A), one beta (FCER1B), and two gamma (FCER1G) subunits, represents the central receptor of IgE-induced reactions. In a genome-wide association scan, we recently identified associations between functional FCER1A variants and total serum IgE levels. Previous studies had reported linkage and association of FCER1B variants with IgE and atopic traits. The FCER1G gene has not yet been investigated with regard to atopy. Filaggrin (FLG) is the strongest known risk gene for eczema, in particular the allergic subtype of eczema. Methods: We investigated the association of FCER1A, FCER1B, and FCER1G variants with IgE in a large population-based cohort (n = 4261) and tested for epistatic effects using the model-based multifactor dimensionality reduction (MB-MDR) method. In addition, we investigated a potential interaction between FLG and FCER1A variants in a large collection of eczema cases (n = 1018) and population controls. Results: Three strongly correlated FCER1A polymorphisms were significantly associated with total and specific IgE levels as well as allergic sensitization. No associations were seen for FCER1B and FCER1G. After adjustment for FLG effects, a significant epistatic effect of the FCER1A variants rs10489854 and rs2511211 on eczema risk was detected. Conclusions: These results suggest that FCER1A variants by themselves and in combination influence IgE levels and act synergistically to influence eczema risk. [less ▲]

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See detailFormer des enseignants francophones pour de nouveaux publics
Defays, Jean-Marc ULg

in Cadet-Joseph, Lucile; Pellegrini, Florence (Eds.) Situation et perspectives d'évolution des départements d'études française des universités européennes (2010)

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See detailCyprinid herpesvirus 3
Michel, Benjamin; Fournier, Guillaume; Lieffrig, François et al

in Emerging Infectious Diseases (2010), 16

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See detailManagement effects on net ecosystem carbon and GHG budgets at European crop sites
Ceschia, E.; Beziat, P.; Dejoux, J. F. et al

in Agriculture, Ecosystems & Environment (2010), 139

Detailed reference viewed: 50 (6 ULg)