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See detailDiscontinuity in Jupiter's main auroral oval
Radioti, Aikaterini ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2007, April 15)

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See detailDiscontinuity in Jupiter's main auroral oval
Radioti, Aikaterini ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

in Journal of Geophysical Research. Space Physics (2008), 113

On the basis of a series of FUV Hubble Space Telescope images obtained between 1997 and 2007 it is shown that there is a segment of the main auroral oval where the emission drops significantly from a few ... [more ▼]

On the basis of a series of FUV Hubble Space Telescope images obtained between 1997 and 2007 it is shown that there is a segment of the main auroral oval where the emission drops significantly from a few hundreds to a few tens of kiloRayleigh, forming a discontinuity in the oval. It is shown that the discontinuity is present in both hemispheres and confined in magnetic local time. Its equatorial source is located in the prenoon and early noon sector. The main auroral oval is associated with the ionosphere-magnetosphere coupling current system which is related to the breakdown of corotation in the middle magnetosphere. Necessary for the electron precipitation in the ionosphere and the formation of the main auroral oval is the presence of upward field-aligned currents, carried by downward moving electrons. Field-aligned currents inferred by Pioneer, Voyager and Galileo in situ observations in the near equatorial plane showed evidence of reduced or/and downward field-aligned currents in the prenoon and early afternoon sector, the location of the equatorial source of the discontinuity. Additionally, we estimate the precipitation energy flux in the ionosphere, for a typical reduced upward field-aligned current value at that region, which is found to be within the range of the observed brightness of the discontinuity. Field aligned current distributions in the ionosphere based on magnetohydrodynamic simulations of the interaction between the solar wind and the magnetosphere have predicted a region of downward currents implying a discontinuity at the main auroral oval emission, in very good agreement with the HST observations presented in this work. [less ▲]

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See detailA Discontinuous Galerkin Formulation of Kirchhoff-Love Shells: From Linear Elasticity to Finite Deformations
Noels, Ludovic ULg; Radovitzky, Raul

Conference (2008, June)

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior [1]. When considering problems ... [more ▼]

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior [1]. When considering problems involving high-order derivatives, discontinuous Galerkin methods can also be seen as a means of enforcing higher-order continuity requirements in a weak manner [2,3]. Recently, the authors [4] have proposed a DG formulation for Kirchhoff-Love shell theory for which both the membrane and the bending response of the shell are considered. The proposed one-field formulation takes advantage of the weak enforcement in such a way that the displacements are the only discrete unknowns, while the C1 continuity is enforced weakly. The consistency, stability and rate of convergence of the numerical method are demonstrated for the case of a linear elastic material. In this work, this method is extended to shell problems involving finite displacements and finite deformations. [less ▲]

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See detailA discontinuous Galerkin formulation of non-linear Kirchhoff–Love shells
Noels, Ludovic ULg

in International Journal for Numerical Methods in Engineering (2009), 78(3), 296-323

Discontinuous Galerkin (DG) methods provide a means of weakly enforcing the continuity of the unknown-field derivatives and have particular appeal in problems involving high-order derivatives. This ... [more ▼]

Discontinuous Galerkin (DG) methods provide a means of weakly enforcing the continuity of the unknown-field derivatives and have particular appeal in problems involving high-order derivatives. This feature has previously been successfully exploited (Comput. Methods Appl. Mech. Eng. 2008; 197:2901-2929) to develop a formulation of linear Kirchhoff-Love shells considering only the membrane and bending responses. In this proposed one-field method - the displacements are the only unknowns, while the displacement field is continuous, the continuity in the displacement derivative between two elements is weakly enforced by recourse to a DG formulation. It is the purpose of the present paper to extend this formulation to finite deformations and non-linear elastic behaviors. While the initial linear formulation was relying on the direct linear computation of the effective membrane stress and effective bending couple-stress from the displacement field at the mid-surface of the shell, the non-linear formulation considered implies the evaluation of the general stress tensor across the shell thickness, leading to a reformulation of the internal forces of the shell. Nevertheless, since the interface terms resulting from the discontinuous Galerkin method involve only the resultant couple-stress at the edges of the shells, the extension to non-linear deformations is straightforward. [less ▲]

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See detailDiscontinuous Galerkin Method for Computing Induced Fields in Superconducting Materials
Kameni, A.; Lambrechts, J.; Remacle, J.-F. et al

in IEEE Transactions on Magnetics (2012), 48(2), 591-594

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See detailDiscontinuous Galerkin Method for Computing Induced Fields in Superconducting Materials"
Kameni, A.; Lambrechts, J.-F.; Remacle, J.-F. et al

in Proceedings of the 18th Conference on the Computation of Electromagnetic Fields (COMPUMAG 2011) (2011, July)

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See detailDiscontinuous Galerkin method for computing vectorials fields in superconductors
Kameni, A.; Boukebeur, F.; Bouillault, F. et al

in Proceedings of the 5th international conference on Advanced COmputational Methods in ENgineering (ACOMEN 2011) (2011, November)

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See detailDiscordance between bovine leukemia virus tax immortalization in vitro and oncogenicity in vivo.
Twizere, Jean-Claude ULg; Kerkhofs, Pierre; Burny, Arsène et al

in Journal of Virology (2000), 74(21), 9895-902

Bovine leukemia virus (BLV) Tax protein, a transcriptional activator of viral expression, is essential for viral replication in vivo. Tax is believed to be involved in leukemogenesis because of its second ... [more ▼]

Bovine leukemia virus (BLV) Tax protein, a transcriptional activator of viral expression, is essential for viral replication in vivo. Tax is believed to be involved in leukemogenesis because of its second function, immortalization of primary cells in vitro. These activities of Tax can be dissociated on the basis of point mutations within specific regions of the protein. For example, mutation of the phosphorylation sites at serines 106 and 293 abrogates immortalization potential in vitro but maintains transcriptional activity. This type of mutant is thus particularly useful for unraveling the role of Tax immortalization activity during leukemogenesis independently of viral replication. In this report, we describe the biological properties of BLV recombinant proviruses mutated in the Tax phosphorylation sites (BLVTax106+293). Titration of the proviral loads by semiquantitative PCR revealed that the BLV mutants propagated at wild-type levels in vivo. Furthermore, two animals (sheep 480 and 296) infected with BLVTax106+293 developed leukemia or lymphosarcoma after 16 and 36 months, respectively. These periods of time are within the normal range of latencies preceding the onset of pathogenesis induced by wild-type viruses. The phenotype of the mutant-infected cells was characteristic of a B lymphocyte (immunoglobulin M positive) expressing CD11b and CD5 (except at the final stage for the latter marker), a pattern that is typical of wild-type virus-infected target cells. Interestingly, the transformed B lymphocytes from sheep 480 also coexpressed the CD8 marker, a phenotype rarely observed in tumor biopsies from chronic lymphocytic leukemia patients. Finally, direct sequencing of the tax gene demonstrated that the leukemic cells did not harbor revertant proviruses. We conclude that viruses expressing a Tax mutant unable to transform primary cells in culture are still pathogenic in the sheep animal model. Our data thus provide a clear example of the discordant conclusions that can be drawn from in vitro immortalization assays and in vivo experiments. These observations could be of interest for other systems, such as the related human T-cell leukemia virus type 1, which currently lack animal models allowing the study of the leukemogenic process. [less ▲]

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See detailDiscordant monozygotic twins for macrocephaly-capillary malformation
Lederer, Damien; Battisti, Oreste ULg; Rack, Katrine et al

in American Journal of Medical Genetics (2012)

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See detailIl discorso di Francesco Guicciardini a Leone X e Francesco I, in vista dell'incontro di Bologna (11 dicembre 1515). Edizione e commento
Moreno, Paola ULg

in Giornale Storico della Letteratura Italiana (2011), CXXVIII(624), 509-522

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See detailDiscours 1919
Hubert, Eugène ULg

Speech/Talk (1919)

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See detailDiscours à l'occasion de la réouverture solennelle des cours
Gloesener, Michel ULg

Speech/Talk (1847)

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See detailLes discours critiques dans les sciences de la gestion
Robert, Jocelyne ULg

Diverse speeche and writing (2013)

La présentation des discours critiques dans les sciences de la gestion nous permettra de souligner l’existence de différents courants au sein des sciences de gestion. Les discours critiques dénonçant les ... [more ▼]

La présentation des discours critiques dans les sciences de la gestion nous permettra de souligner l’existence de différents courants au sein des sciences de gestion. Les discours critiques dénonçant les théories et pratiques de management management se présentent sous forme d’ouvrages scientifiques ou de manuels, d’essais. Ils sont produits par des académiques et des consultants. L’existence de ces discours peut être expliquée par les difficultés que rencontrent les systèmes sociaux et économiques, par les approches de certaines disciplines (sociologie, psychologie, philosophie notamment), par les discours d’acteurs confrontés à des expériences remettant en question le crédo officiel. Ces discours permettent de mettre en évidence les faiblesses du modèle dominant et jettent les bases d’une nouvelle discipline davantage favorable à la controverse et aux oppositions. [less ▲]

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See detailDiscours critiques face au modèle dominant dans les sciences de la gestion
Robert, Jocelyne ULg

Conference (2009, April 23)

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See detailLes discours d'affirmation des lettres belges
Provenzano, François ULg

in Ecrivains modes d'emploi. De Voltaire à bleuOrange (2012)

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See detailLe discours d'excellence. Rhétorique et idéologie de l'évaluation en milieu universitaire
Durand, Pascal ULg; Belloi, Livio ULg; Bouquiaux, Laurence ULg

in Charlier, Jean-Emile; Croché, Sarah; Leclercq, Bruno (Eds.) Contrôler la qualité dans l'enseignement supérieur (2012)

Extrait : « Notre point de vue sera celui d’une analyse discursive consistant à cerner d’un trait sommaire les opérateurs rhétoriques d’une idéologie générale, c’est-à-dire d’une représentation non ... [more ▼]

Extrait : « Notre point de vue sera celui d’une analyse discursive consistant à cerner d’un trait sommaire les opérateurs rhétoriques d’une idéologie générale, c’est-à-dire d’une représentation non seulement de la « qualité », mais aussi de l’enseignement et de la recherche, elle-même corrélée à une représentation assez caractéristique du monde. Car, à chacun de ces niveaux, il y a en effet production de discours, sous des formes elles-mêmes très diverses : rapports d’auto-évaluation et d’évaluation ; guides à l’évaluation ; allocutions programmatiques des autorités universitaires ou encore grandes déclarations d’intention ou de synthèse émanant de la sphère politique, d’agences nationales et d’organisations internationales. La cohérence de ces discours, qui est aussi au principe de leur pouvoir d’inculcation et de la résistance qu’ils opposent à la critique, tient d’une part au retour en vis sans fin, d’un niveau à l’autre, des mêmes arguments et des mêmes enjeux, et d’autre part à un réagencement, à chaque niveau, de mêmes mots, de mêmes constructions syntaxiques, de mêmes configurations logiques, selon cette loi, propre à toute propagande, voulant que l’effet d’évidence se crée par la répétition et que le discours lui-même se valide par sa propre redondance.  » [less ▲]

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