References of "2012"
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See detailUsing Proper Orthogonal Decomposition Methods for Comparing CFD Results to Experimental Measurements
Andrianne, Thomas ULg; Guissart, Amandine ULg; Terrapon, Vincent ULg et al

in Proceedings of the 5th Symposium on Integrating CFD and Experiments in Aerodynamics (Integration 2012) (2012, October 03)

This work presents a method for quantitative comparison of numerical results to experimental measurements. It is based on the concept of Proper Orthogonal Decomposition. This technique is selected in ... [more ▼]

This work presents a method for quantitative comparison of numerical results to experimental measurements. It is based on the concept of Proper Orthogonal Decomposition. This technique is selected in order to compare the unsteady aerodynamic flows around static and oscillating bodies obtained from wind tunnel testing and numerical simulations. Two dimensional Time-resolved Particle Image Velocimetry measurements are carried out on the upper surface a 4:1 rectangular cylinder. Simulations are performed using unsteady Reynolds-Averaged Navier-Stokes and an unsteady Discrete Vortex Method. It is demonstrated that the proposed technique is a good preliminary step for comparing the main characteristics of unsteady aerodynamic data. [less ▲]

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See detailSubstrats cérébraux des processus moteurs automatiques et inconscients
D'Ostilio, Kevin ULg

Doctoral thesis (2012)

Les mécanismes à la base des troubles du contrôle moteur sont encore peu compris. L'étude des patients akinétiques et hyperkinétiques soulignent l’importance physiopathologique du cortex (pré)moteur et ... [more ▼]

Les mécanismes à la base des troubles du contrôle moteur sont encore peu compris. L'étude des patients akinétiques et hyperkinétiques soulignent l’importance physiopathologique du cortex (pré)moteur et des noyaux gris centraux. Ces études ne nous permettent cependant pas de déterminer le rôle respectif de ces différentes régions. Les modèles actuels suggèrent que certains mouvements anormaux résultent d’une perturbation de l’équilibre entre les processus de facilitation et d’inhibition des programmes moteurs secondaire à une altération de l’intégration perceptuo-motrice. Dans le cadre de ce travail, nous avons utilisé une tâche d'amorçage subliminale afin d'examiner les corrélats cérébraux de ces processus chez des sujets jeunes ainsi que chez des patients atteints de la maladie de Parkinson. Nous avons montré que l'activation/facilitation et l'inhibition automatiques et inconscientes étaient sous-tendues par un réseau moteur cortico-sous-cortical. Ce résultat a été ensuite confirmé au moyen d'une approche lésionnelle par l'étude de patients parkinsoniens. Nous avons également mis en évidence une dépendance cingulo-préfrontale dans la détection /résolution de conflit inconscient. Ces résultats remettent en cause les théories traditionnelles considérant la conscience et le contrôle cognitif comme étant étroitement reliés et contribue à une meilleure compréhension de la physiopathologie des mouvements anormaux. [less ▲]

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See detailEl traductor, ¿otro escritor de la literatura nacional?
Willson, Patricia ULg

Conference given outside the academic context (2012)

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See detailLe jugement du goût, du gustatif à l’esthétique
Von Hoffmann, Viktoria ULg

Conference (2012, October 02)

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See detailGBS SCREENING Belgium: current and future guidelines
MELIN, Pierrette ULg

Conference (2012, October 02)

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See detailDouble-scale modelling of the hydro-mechanical behaviour of clay rocks
van den Eijnden, Abraham Pieter ULg; Bésuelle, Pierre; Chambon, René

Scientific conference (2012, October 02)

The work to be presented concerns the modelling of hydro-mechanical behaviour of clayey rocks as encountered in the field of underground nuclear waste storage. For the modelling a two scale finite element ... [more ▼]

The work to be presented concerns the modelling of hydro-mechanical behaviour of clayey rocks as encountered in the field of underground nuclear waste storage. For the modelling a two scale finite element (FE2) approach is envisioned, containing a macro-scale model of a poro mechanical continuous medium and a micro-scale model of a representative elementary volume (REV) containing a (discontinuous) microstructure of solid grains and pore space. The difference with classical finite element modelling is the absence of a direct constitutive relation on the macro scale. Instead, for each integration point on the macro level, a REV is modelled on the micro level to numerically derive this relation to be used on the macro level. In this way the constitutive behaviour at the macro-scale is dictated by the global response of the REV that serves as its (numerical) constitutive relation. This constitutive relation can be found by homogenization of the REV. In continuation of the work of Frey [1], [2], a finite element model is developed to model the constitutive relation for the macro level by means of a REV with a microstructure. The microstructure contains elastic, impermeable grains with interface elements to model the intergranular contacts. These interface elements are used for both fluid flow and intergranular cohesive and frictional forces. The hydraulic and mechanical part are coupled by the connectivity of the interfaces itself depending on an equivalent opening between the opposite sides of the interface elements (the grain boundaries). The representation of an actual opening by these interface elements allows deformation and damage to concentrate in the interfaces. Intergranular cohesive forces are modelled by damage laws for normal and tangential displacements of opposite interface sides. By defining different grain geometries and arrangements, different macroscopic responses can be obtained. In this way, complex macroscopic constitutive behaviour can be modelled with very simple interface damage models at the micro level. However, the use of the FE2 method is computationally expensive. The derivation of the consistent tangent stiffness matrix of the global response of the REV is part of this computational expense. In order to overcome a significant part of this computational expense of the method, the idea is to use analytical homogenization to derive the tangent stiffness matrix from the REV instead of more straightforward numerical homogenization. A particular challenge in the application of analytical condensation is to overcome the discontinuous nature of the interface elements that are caused by cohesive forces over the interface opening. Once this is obtained, condensation of the finite element system of equations and the application of the boundary conditions can lead to an analytic solution for the consistent tangent stiffness matrix at the macro scale. For a continuous, solid phase media this condensation method for homogenization is described in [3]. It is the goal to add the coupling with the fluid phase and the cohesive forces to this method of analytic homogenization. In addition to the homogenization, the more straightforward approach to reduce calculation time by parallelization is foreseen. References: [1] Frey, J. (2010), Modélisation multi-échelle de l’endommagement hydroméchanique des roches argileuses, PhD Thesis, INP Grenoble, Université de Grenoble [2] Frey, J; Chambon, R; Dascalu C; (2012), A two scale poromechanical model for cohesive rocks accepted for publication, Acta Geotechnica [3] Kouznetsova, V; Brekelmans, W.A.M; Braaijens, F.P.T (2001) An approach to micro-macro modeling of heterogeneous materials, Computational Geomechanics 27, 37-48 [less ▲]

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See detailis gender a preoccupation of GGP survey ?
Gavray, Claire ULg; Cardelli, Rebecca ULg

Scientific conference (2012, October 02)

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See detailSimulating the growth of supra-glacial lakes at the western margin of the Greenland ice sheet
Leeson, A.; Shepherd, A.; Palmer, S. et al

in Cryosphere (The) (2012), 6

We present a new method of modelling the growth of supraglacial lakes at the western margin of the Greenland ice sheet, based on routing runoff estimated by a regional climate model across a digital ... [more ▼]

We present a new method of modelling the growth of supraglacial lakes at the western margin of the Greenland ice sheet, based on routing runoff estimated by a regional climate model across a digital elevation model (DEM) of the ice sheet surface. Using data acquired during the 2003 melt season, we demonstrate that the model is 19 times more likely to correctly predict the presence (or absence) of lakes than it is to make incorrect predictions, within an elevation range of 1100 to 1700 metres above sea level (m a.s.l.), when compared with MODIS satellite imagery. Of the 66% of observed lake locations which the model correctly reproduces, the simulated lake onset day is found to be correlated with that observed with a Pearson correlation coefficient of 0.76. Our model accurately simulates maximum cumulative lake area with only a 1.5% overestimate. However, because our model does not simulate processes leading to lake stagnation or decay, such as refreezing or drainage, at present we do not simulate absolute daily lake area. We find that the maximum potential lake-covered ice sheet area is limited by topography to 6.4%. We estimate that this corresponds to a volume of 1.49 km3, 12% of the runoff produced in 2003. This can be taken as an upper bound given uncertainty in the DEM. This study has proved a good first step towards capturing the variability of supraglacial lake evolution with a numerical model. These initial results are promising and suggest that the model is a useful tool for use in analysing the behaviour of supraglacial lakes on the Greenland ice sheet in the present day and potentially beyond. [less ▲]

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See detailPlanification successorale : les avancées du Règlement européen relatif aux successions
Wautelet, Patrick ULg

Conference (2012, October 02)

Cette présentation a pour objectif de mettre en exergue les grands principes retenus par le Règlement européen relatif aux successions. Pour ce faire, les règles européennes sont contrastées avec le cadre ... [more ▼]

Cette présentation a pour objectif de mettre en exergue les grands principes retenus par le Règlement européen relatif aux successions. Pour ce faire, les règles européennes sont contrastées avec le cadre juridique actuel. [less ▲]

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See detailSimple and Automatic Closed Grinding and Extraction System
Fischer, Christophe ULg; Lognay, Georges ULg

in Journal of Chemical Education (2012)

This article describes a simple, automatic, and closed grinding system for small samples using common laboratory equipment that is particularly useful for air-sensitive samples or volatile compounds ... [more ▼]

This article describes a simple, automatic, and closed grinding system for small samples using common laboratory equipment that is particularly useful for air-sensitive samples or volatile compounds analyses. [less ▲]

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See detailAssessment of non-genetic parameters of the racing performances of Arabian and Thoroughbred horses in Algeria
Tennah, Safia ULg; Kafidi, Nacer; Antoine-Moussiaux, Nicolas ULg et al

in African Journal of Biotechnology (2012)

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See detailHabitat diversity of the Multicolored Asian ladybeetle Harmonia axyridis Pallas (Coleoptera: Coccinellidae) in agricultural and arboreal ecosystems: a review
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2012), 16(4), 553-563

The Multicolored Asian ladybeetle, Harmonia axyridis (Pallas), native to Asia, is an invasive species in many European and American countries. Initially introduced as a biological control agent against ... [more ▼]

The Multicolored Asian ladybeetle, Harmonia axyridis (Pallas), native to Asia, is an invasive species in many European and American countries. Initially introduced as a biological control agent against aphids and coccids in greenhouses, this alien species rapidly invaded many habitats such as forests, meadows, wetlands, and agricultural crops. This paper reviews the habitats (forests, crops, herbs, gardens and orchards) where H. axyridis has been observed, either during insect samplings or as part of Integrated Pest Management (IPM) programs. Studies have referenced H. axyridis on 106 plant taxa (35 arboreal species, 21 crop species, 27 herbaceous species, 11 ornamental species, and 12 orchard species) and have identified 89 plant- prey relationships (34 arboreal species, 16 crop species, 13 herbaceous species, 10 ornamental species, and 16 orchard species) in different countries. Harmonia axyridis is more abundant in forest areas, principally on Acer, Salix, Tilia and Quercus, than in agroecosystems. Some plant species, such as Urtica dioica L., which surround crops, contain large numbers of H. axyridis and could constitute important reserves of this alien species in advance of aphid invasions into crops. This review highlights the polyphagy and eurytopic aspect of H. axyridis. [less ▲]

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See detailLe terrorisme à motif religieux en Turquie : Recrutement, profils et motivations des membres du Hizbullah turc
Gülver, Murat ULg

Doctoral thesis (2012)

Depuis plus de cinquante ans, la Turquie a été la victime permanente d’actes terroristes aux multiples motivations. Ces dernières années, le terrorisme à motif religieux y a connu une montée en puissance ... [more ▼]

Depuis plus de cinquante ans, la Turquie a été la victime permanente d’actes terroristes aux multiples motivations. Ces dernières années, le terrorisme à motif religieux y a connu une montée en puissance. Plus de dix organisations terroristes, se basant sur une idéologie religieuse, ce sont organisées sur le territoire turc dans le but de changer le système politique et pour fonder un État islamique. Dans cette recherche, nous avons examiné le cas du Hizbullah turc, en tant que la plus grande et la plus violente organisation terroriste à motif religieux en Turquie. Cette étude a exploré d’abord les méthodes de recrutement du Hizbullah, ensuite les profils de ses militants et enfin les motivations individuelles et les facteurs, qui se trouvent à la base de la radicalisation religieuse en Turquie. Pour ce faire, l’examen quantitatif et qualitatif de données originales comble les principales lacunes dans la recherche sur le terrorisme à motif religieux et donne des indications pour de futures recherches criminologiques et de politiques de sécurité préventives. Dans cette étude, pour examiner et comprendre le recrutement, les profils et les motivations des membres du Hizbullah, nous avons utilisé essentiellement deux sources : les autobiographies des militants eux-mêmes et les entretiens semi-structurés avec des policiers spécialistes du terrorisme à motif religieuse, ainsi que des desservants du culte islamique, qui ont une expérience dans les régions où le Hizbullah était actif. Cette recherche entend apporter une contribution significative à la compréhension des motivations individuelles des militants du Hizbullah, à l’identification des caractéristiques des membres, et à la définition des méthodes de recrutement de l’organisation. Elle propose en outre de nombreuses informations aux organisations de sécurité pour la lutte antiterroriste. [less ▲]

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See detailImproved precision on the radius of the nearby super-Earth 55 Cnc e
Gillon, Michaël ULg; Demory, B.-O.; Benneke, B. et al

in Astronomy and Astrophysics (2012), 539

We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 microns. An individual analysis of these new data leads to a planet radius of 2.21-0.16+0.15 Rearth ... [more ▼]

We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 microns. An individual analysis of these new data leads to a planet radius of 2.21-0.16+0.15 Rearth, in good agreement with the values previously derived from the MOST and Spitzer transit discovery data. A global analysis of both Spitzer transit time-series improves the precision on the radius of the planet at 4.5 microns to 2.20+-0.12 Rearth. We also performed an independent analysis of the MOST data, paying particular attention to the influence of the systematic effects of instrumental origin on the derived parameters and errors by including them in a global model instead of performing a preliminary detrending-filtering processing. We deduce from this reanalysis of MOST data an optical planet radius of 2.04+-0.15 Rearth that is consistent with our Spitzer infrared radius. Assuming the achromaticity of the transit depth, we performed a global analysis combining Spitzer and MOST data that results in a planet radius of 2.17+-0.10 Rearth (13,820+-620 km). These results confirm that the most probable composition of 55 Cnc e is an envelope of supercritical water above a rocky nucleus. [less ▲]

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See detailStochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452
Neiner, C.; Floquet, M.; Samadi, R. et al

in Astronomy and Astrophysics (2012), 546

Context. Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of ... [more ▼]

Context. Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of iron-peak elements in the envelope of the star. In the Milky Way, p-modes are observed in stars that are hotter than or equal to the B3 spectral type, while g-modes are observed at the B2 spectral type and cooler. <BR /> Aims: We observed a B0IVe star, HD 51452, with the high-precision, high-cadence photometric CoRoT satellite and high-resolution, ground-based HARPS and SOPHIE spectrographs to study its pulsations in great detail. We also used the lower resolution spectra available in the BeSS database. <BR /> Methods: We analyzed the CoRoT and spectroscopic data with several methods: Clean-NG, FreqFind, and a sliding window method. We also analyzed spectral quantities, such as the violet over red (V/R) emission variations, to obtain information about the variation in the circumstellar environment. We calculated a stellar structure model with the ESTER code to test the various interpretation of the results. <BR /> Results: We detect 189 frequencies of variations in the CoRoT light curve in the range between 0 and 4.5 c d[SUP]-1[/SUP]. The main frequencies are also recovered in the spectroscopic data. In particular we find that HD 51452 undergoes gravito-inertial modes that are not in the domain of those excited by the κ-mechanism. We propose that these are stochastic modes excited in the convective zones and that at least some of them are a multiplet of r-modes (i.e. subinertial modes mainly driven by the Coriolis acceleration). Stochastically excited gravito-inertial modes had never been observed in any star, and theory predicted that their very low amplitudes would be undetectable even with CoRoT. We suggest that the amplitudes are enhanced in HD 51452 because of the very rapid stellar rotation. In addition, we find that the amplitude variations of these modes are related to the occurrence of minor outbursts. <BR /> Conclusions: Thanks to CoRoT data, we have detected a new kind of pulsations in HD 51452, which are stochastically excited gravito-inertial modes, probably due to its very rapid rotation. These modes are probably also present in other rapidly rotating hot Be stars. The CoRoT space mission, launched on December 27, 2006, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA (RSSD, and Science Programs), Germany, and Spain. This work uses observations partly made with the HARPS instrument at the 3.6-m ESO telescope (La Silla, Chile) in the framework of the LP182.D-0356, as well as data obtained with Sophie at OHP and from the BeSS database.Table 3 is available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A> [less ▲]

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See detailHigh-precision photometry by telescope defocusing - IV. Confirmation of the huge radius of WASP-17 b
Southworth, John; Hinse, T. C.; Dominik, M. et al

in Monthly Notices of the Royal Astronomical Society (2012), 426

We present photometric observations of four transits in the WASP-17 planetary system, obtained using telescope defocusing techniques and with scatters reaching 0.5 mmag per point. Our revised orbital ... [more ▼]

We present photometric observations of four transits in the WASP-17 planetary system, obtained using telescope defocusing techniques and with scatters reaching 0.5 mmag per point. Our revised orbital period is 4.0 ± 0.6 s longer than previous measurements, a difference of 6.6σ, and does not support the published detections of orbital eccentricity in this system. We model the light curves using the JKTEBOP code and calculate the physical properties of the system by recourse to five sets of theoretical stellar model predictions. The resulting planetary radius, R[SUB]b[/SUB] = 1.932 ± 0.052 ± 0.010 R[SUB]Jup[/SUB] (statistical and systematic errors, respectively), provides confirmation that WASP-17 b is the largest planet currently known. All 14 planets with radii measured to be greater than 1.6 R[SUB]Jup[/SUB] are found around comparatively hot (T[SUB]eff[/SUB] > 5900 K) and massive (M[SUB]A[/SUB] > 1.15 M[SUB]&sun;[/SUB]) stars. Chromospheric activity indicators are available for eight of these stars, and all imply a low activity level. The planets have small or zero orbital eccentricities, so tidal effects struggle to explain their large radii. The observed dearth of large planets around small stars may be natural but could also be due to observational biases against deep transits, if these are mistakenly labelled as false positives and so not followed up. Based on data collected by MiNDSTEp with the Danish 1.54-m telescope at the ESO La Silla Observatory.Royal Society University Research Fellow. [less ▲]

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See detailSmall satellite activities at the University of Liège
Salvador, Lucas ULg; Rochus, Pierre ULg

Poster (2012, October 01)

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See detailPropriétés physicochimiques et électrochimiques de catalyseurs Pt/xérogel de carbone synthétisés par la méthode de SEA multiple.
Zubiaur, Anthony ULg; Chatenet, M.; Maillard, F. et al

Conference (2012, October 01)

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See detailUltraviolet Auroral Pulsations on Saturn from Cassini UVIS
Pryor, Wayne R.; Esposito, L. W.; Jouchoux, A. et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2012, October 01)

Cassini Ultraviolet Imaging Spectrograph (UVIS) observations of Saturn were obtained on 2009 days 278-280 with the UVIS long slit aligned east-west along the northern auroral oval. Bright quasi-periodic ... [more ▼]

Cassini Ultraviolet Imaging Spectrograph (UVIS) observations of Saturn were obtained on 2009 days 278-280 with the UVIS long slit aligned east-west along the northern auroral oval. Bright quasi-periodic localized bursts of UV emission were often observed with 1 hour spacing that slowly moved sub-corotationally along the main auroral arc. We will report on an apparent correlation of the bursts with the locations of Saturn's moons, and a search for other such examples. We will also compare the UVIS results with simultaneous Cassini Imaging Science Subsystem (ISS) auroral images. [less ▲]

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See detailFonctionnalisation surfacique de poudre de carbone pour greffer des nanoparticules métalliques par plasma.
Laurent-Brocq, M.; Job, Nathalie ULg; Pireaux, J.-J.

Conference (2012, October 01)

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