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See detailElectrostriction at the LaAlO3/SrTiO3 Interface
Cancellieri, C.; Fontaine, Denis ULg; Gariglio, S. et al

in Physical Review Letters (2011), 107

We present a direct comparison between experimental data and ab initio calculations for the electrostrictive effect in the polar LaAlO3 layer grown on SrTiO3 substrates. From the structural data, a ... [more ▼]

We present a direct comparison between experimental data and ab initio calculations for the electrostrictive effect in the polar LaAlO3 layer grown on SrTiO3 substrates. From the structural data, a complete screening of the LaAlO3 dipole field is observed for film thicknesses between 6 and 20 uc. For thinner films, an expansion of the c axis of 2% matching the theoretical predictions for an electrostrictive effect is observed experimentally. [less ▲]

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See detailElectrosynthesis of polyacrylic/polypyrrole composites : formation of polypyrrole wires
Jérôme, Christine ULg; Labaye, David; Bodart, Isabelle et al

in Synthetic Metals (1999), 101(1-3), 3-4

A new preparation method is reported for the synthesis of conducting polypyrrole nanowires. This two-step all-electrochemical method consists in the cathodic grafting of a thin polyacrylate film on a ... [more ▼]

A new preparation method is reported for the synthesis of conducting polypyrrole nanowires. This two-step all-electrochemical method consists in the cathodic grafting of a thin polyacrylate film on a carbon electrode, which is then used as an anode for the electropolymerization of pyrrole. Scanning electron microscopy shows the formation of polypyrrole wires (diameter ~600 nm lenght ~300 µm) growing through holes in the polyacrylate precoating. The effect of the experimental conditions, such as nature of the grafted polymer, solvent, and electrode, on the wire formation is discussed. [less ▲]

Detailed reference viewed: 22 (2 ULg)
See detailElectrothérapie. Electrostimulation.
Crepon, F.; DOUBRERE, J. F.; Vanderthommen, Marc ULg et al

in Encyclopédie médico-chirurgicale (EMC) (2007)

Detailed reference viewed: 156 (6 ULg)
See detail« Élégie funèbre pour Drévicius », « À Richard Bartholinus » [traduction de textes latins de Dantiscus]
Pietquin, Paul ULg

in Polet, Jean-Claude (Ed.) Patrimoine littéraire européen. 7 : Etablissement des genres et retour du tragique : 1515-1616 (1995)

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See detailThe ELEKTRA project: Towards a new learning experience
Kickmeier-Rust, M; Schwarz, D; Albert, Dietrich et al

in Pohl, M; Holzinger, A; Motschnig, R (Eds.) et al M3 – Interdisciplinary aspects on digital media & education (2006, November 23)

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See detailThe ELEKTRA project: Towards a new learning experience
Kickmeier-Rust, M. D.; Schwarz, D.; Albert, D. et al

in Pohl, Margit; Holzinger, A.; Motschnig, R. (Eds.) et al M3 – Interdisciplinary aspects on digital media & education (2006)

Digital game-based learning is a hot topic of research and development. Since the advent of computer and video games, educators were inherently interested in utilizing the beneficial aspects of computer ... [more ▼]

Digital game-based learning is a hot topic of research and development. Since the advent of computer and video games, educators were inherently interested in utilizing the beneficial aspects of computer games for educational purposes. These factors are primarily the intrinsic motivation of games, immersive environments, engaging stories, and an artful balance between challenges and continuously growing abilities. Proponents of computer games delivered a large number of empirical investigations revealing that games may foster the development of abilities and competencies. Besides the advantageous aspects of computer games, a variety of problems were reported by researchers. Due to the high costs of professional game development, many educational games are technologically poor and cannot compete with entertainment games in terms of visual design, possibilities for interactions, or storytelling. Moreover, many current educational games do not incorporate a sound psychological, pedagogical, or didactic background; instead they are focusing on transmission or rehearsal of isolated facts or skills. Finally, such games lack the ability to adapt to individual competencies failing to balance challenge and abilities regarding knowledge or skills. The ELEKTRA project, introduced in this article, aims for addressing these problems relying on an interdisciplinary approach of cognitive science, neuroscience, pedagogy, game design, and game development. The project will develop an adventure game that can keep up with commercial games and that focuses on primarily curriculum-related educational purposes by incorporating a sound psychological and pedagogical framework. Moreover, the project will prove the outcomes of research and development by a comprehensive game demonstrator. [less ▲]

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See detailElektraRed, NetVocList et LinguaProLio : 3 recettes de vitamines pour dynamiser la langue
Thiry, Bernard ULg

in Les Cahiers de la Recherche en UER-Langues de HEC-ULg (2008), 2

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See detailElektraRed, NetVocList et LinguaProLio : trois recettes de vitamines pour dynamiser la langue
Thiry, Bernard ULg

in Langage et l'Homme (Le) : Recherches Pluridisciplinaires sur le Langage (2008), XXXXIII(2), 109-128

L'apprentissage des langues est un phénomène complexe, notamment parce que son succès dépend du degré de correspondance entre les convictions et attitudes de toute une génération d’étudiants, d’une part ... [more ▼]

L'apprentissage des langues est un phénomène complexe, notamment parce que son succès dépend du degré de correspondance entre les convictions et attitudes de toute une génération d’étudiants, d’une part, et de professeurs, d’autre part. Quand ses résultats se révèlent décevants, force est alors d'interroger les méthodologies et les outils mis en oeuvre. C'est ce que tente de faire le présent article en proposant des solutions alternatives : trois « recettes de vitamines » pour dynamiser la langue. [less ▲]

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See detailElektronenspectroscopie: een analysetechniek voor het bestuderen van oppervlakken.
Locht, Robert ULg; Delwiche, Jacques ULg

in Chemisch Weekblad (1973), 69(30/31), 21-23

The shift of electron binding energies can be measured by ESCA (Electron Spectroscopy for Chemical Analysis). This phenomenon is the basis of important data for structural analysis.

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See detailL'élément d'extranéité au sein des faits générateurs de la demande et la règle de conflit comme règle de droit
Boularbah, Hakim ULg

in J. Linsmeau et M. Storme : Le rôle respectif du juge et des parties dans le procès civil (1999)

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See detailElément de coque à géométrie de révolution
Debongnie, Jean-François ULg

Report (1974)

The first par of this report is focused on the formulation of the conical shell element in SAMCEF. In chapter 2, benchmark applications of this element in statics are discussed. Chapter 3 is devoted to ... [more ▼]

The first par of this report is focused on the formulation of the conical shell element in SAMCEF. In chapter 2, benchmark applications of this element in statics are discussed. Chapter 3 is devoted to numerical tests in modal analysis. [less ▲]

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See detailElement Diffusion in the Solar Interior
Thoul, Anne ULg; Bahcall, J.N.; Loeb, A.

Poster (1992, December)

We study the diffusion of helium and other heavy elements in the solar interior, using the flow equations developed by Burgers (1969) for a multi-component fluid. The set of equations is solved exactly ... [more ▼]

We study the diffusion of helium and other heavy elements in the solar interior, using the flow equations developed by Burgers (1969) for a multi-component fluid. The set of equations is solved exactly, including the residual heat flow terms. No approximation is made about the relative concentrations and no restriction is placed on the number of elements considered. For helium diffusion, we compare our results with those obtained by Bahcall and Loeb (1990) using a simplified treatment with heat flows neglected. We find that the inclusion of the residual heat flow terms leads to a significant increase in the helium diffusion velocity. However, we also find that the temperature and charge-dependence of the Coulomb logarithm has the opposite effect, leading to a decrease in the helium diffusion velocity. By coincidence, the two effects partially cancel each other out throughout most of the solar interior. Our complete treatment of element diffusion could be directly incorporated in a standard stellar evolution code, but, for convenience, we also give simple analytical fits of our numerical results. Burgers, J.M. 1969, Flow equations for composite gases(Academic Press, New York). Bahcall, J.N., and Loeb, A. 1990, Ap.J.,360, 267. [less ▲]

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See detailELEMENT DIFFUSION IN THE SOLAR INTERIOR
Thoul, Anne ULg; BAHCALL, J. N.; LOEB, A.

in Astrophysical Journal (1994), 421(2), 828-842

We study the diffusion of helium and other heavy elements in the solar interior by solving exactly the set of flow equations developed by Burgers for a multicomponent fluid, including the residual heat ... [more ▼]

We study the diffusion of helium and other heavy elements in the solar interior by solving exactly the set of flow equations developed by Burgers for a multicomponent fluid, including the residual heat-flow terms. No approximation is made concerning the relative concentrations, and no restriction is placed on the number of elements considered. We give improved diffusion velocities for hydrogen, helium, oxygen, and iron, in the analytic form derived previously by Bahcall & Loeb. These expressions for the diffusion velocities are simple to program in stellar evolution codes and are expected to be accurate to similar to 15%. We find that the inclusion of the residual heat flow terms leads to an increase in the hydrogen diffusion velocity. We compare our numerical results-with those obtained analytically by Bahcall & Loeb using a simplified treatment, as well as with those derived numerically by Michaud & Proffitt. We find that for conditions characteristic of the Sun, the results of Bahcall & Loeb for the hydrogen diffusion velocity are smaller than our more accurate numerical results by similar to 30%, except very near the center where the error becomes larger. The Michaud & Proffitt results differ from the numerical results derived here by less than or similar to 15%. Our complete treatment of element diffusion can be directly incorporated in a standard stellar evolution code by means of an exportable subroutine, but, for convenience, we also give simple analytical fits to our numerical results. [less ▲]

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See detailUn élément Epontilles pour LBR5-Report R&D5
Rigo, Philippe ULg

Report (2003)

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See detailElement fluxes, forest floor characteristics and microbial activities under deciduous tree species after conversion of a Norway spruce (Picea abies (L.) Karst.) stand
Bazgir, Masoud ULg; Guillaume, Patricia ULg; Carnol, Monique ULg

Poster (2011, March)

Forest management is currently confronted with major questions, such as how to adapt plantation forests to a changing world. This questioning is not only essential with regard to forest health and ... [more ▼]

Forest management is currently confronted with major questions, such as how to adapt plantation forests to a changing world. This questioning is not only essential with regard to forest health and productivity, but also within the frame of climate mitigation. As Norway spruce monocultures (Picea abies) have been planted in Europe beyond their assumed natural range, are subjected to forest decline and have negative impacts on ecological conditions, conversion into mixed stands has been suggested. Tree species can influence nutrient inputs, soil microbial activity, soil chemistry and nutrient cycling in forest ecosystems. These tree species effects on biogeochemical cycles may vary according to soil type, site characteristics and land use history. The objective of the present study was to quantify element fluxes in throughfall and seepage water, forest floor exchangeable element pools and nitrogen transformations, 12 years after conversion from Picea abies monocultures to a mixed forest stand. Measurements were performed under young and mature Picea abies, Alnus glutinosa (L.) Gaertn., Quercus robur L. and Sorbus aucuparia L. Thus trees have grown on the same site, sharing identical initial soil conditions and site history, so that potential effects on microbial processes and soil properties can be imputed to tree species. Results showed that conversion had a short term impact on nutrient budgets and nutrient cycling in the upper soil layer; in particular on input fluxes of acidifying cations, soil base saturation, net N mineralization and nitrification. [less ▲]

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See detailElement removal in harvested tree biomass: scenarios for critical loads in Wallonia, south Belgium
Bosman, Bernard ULg; Remacle, Jean; Carnol, Monique ULg

in Water, Air & Soil Pollution : Focus (2001), 1

The critical load concept is now widely used as a tool for developing emission control policies in Europe. As a signatory country of the Convention of Long-Range Transboundary Air Pollution, critical ... [more ▼]

The critical load concept is now widely used as a tool for developing emission control policies in Europe. As a signatory country of the Convention of Long-Range Transboundary Air Pollution, critical loads for acidity, nutrient nitrogen, nitrogen and sulphur have been calculated for the Flemish and Walloon regions in Belgium. This paper describes the methodology used for estimating critical loads for forest soils in the Walloon region according to the Steady-State Mass Balance equations. As an example the methodology was applied to the catchment `Waroneu', situated in a sensitive area of the Haute Ardenne. Main input parameters to the equations were derived from precipitation and runoff data of the catchment study. Improved estimates of nitrogen uptake (Nu) and base cation uptake (BCu) were obtained by intensive sampling of Picea abies and Quercus robur trees. Nutrient contents (Ca, Mg, K, N) and nutrient to nitrogen ratios of Picea abies reflected the poor soil quality at a site with high N deposition. Quercus robur nutrient contents increased from stem to higher order branches with a high proportion of nutrients located in the bark. However the simulation of stem only harvesting had a minor effect on critical loads. Measured wood densities were lower than reported literature values with a main effect on Nu and BCu estimates. The use of recommended default values and/or data derived from the experimental site resulted in a wide range of critical loads, some of which were largely overestimated. Results demonstrated the importance of site specific data for critical load calculations. [less ▲]

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See detailElement-Free Galerkin Method for Crack Propagation
Ponthot, Jean-Philippe ULg; BELYTSCHKO, T.

Conference (1999)

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See detailElemental 2D imaging of paintings with a mobile EDXRF system
Hocquet, François-Philippe ULg; Calvo Del Castillo, Helena ULg; Cervera Xicotencatl, Ariadna ULg et al

in Analytical and Bioanalytical Chemistry (2011), 399(9), 3109-3116

Imaging techniques are now used commonly and intensively in cultural heritage object analysis. Nowadays, many different techniques in nature as well as many applications exist, where they can be applied ... [more ▼]

Imaging techniques are now used commonly and intensively in cultural heritage object analysis. Nowadays, many different techniques in nature as well as many applications exist, where they can be applied. X-ray radiography and infrared reflectography as well as UV photography are some of the most applied techniques. The study of works of art usually requires these techniques to be non-invasive. Furthermore, they are frequently required to perform in situ analysis. A few years ago, our laboratory developed a mobile energy-dispersive X-ray fluorescence and UV-vis-NIR coupled spectrometer, especially designed for fieldwork studies, where all three techniques can be applied strictly at the same site of analysis. Recent developments on a new positioning system have now allowed us to perform 2D elemental mappings with our equipment, which is especially well adapted to painting analysis. The system control is carried out entirely through a laptop computer running a dedicated homemade software. The positioning is achieved by means of a CCD camera embedded in the system and controlled via a Wi-Fi connection through the computer. The data acquisition system, which is made through a homemade multichannel pulse height analyzer, being also managed via the software mentioned above, goes through an Ethernet connection. We will present here the new developments of the system and an example of in situ 2D elemental mapping applied on an anonymous oil painting on wood panel. The discovery of a hidden painting under this oil painting makes it a good choice for a first example of 2D large scan with a mobile instrument. © Springer-Verlag 2010. [less ▲]

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See detailElemental and Isotopic Abundances in Metal-Poor Stars
Magain, Pierre ULg

in Walsh, J. R.; Danziger, I. J. (Eds.) Science with the VLT, Proceedings of the ESO Workshop held at Garching, Germany, 28 June - 1 July 1994 (1995)

Not Available

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