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See detailDifficultés de Mallarmé ?
Bernard, Michel; Noël, Odile; Purnelle, Gérald ULg

Book published by Seli Arslan (1999)

Detailed reference viewed: 13 (3 ULg)
See detailDifficultés méthodologiques rencontrées dans les premiers pas d'une recherche doctorale
Deprez, Christophe ULg

Diverse speeche and writing (2013)

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See detailLes difficultés morphosyntaxiques des enfants présentant des troubles spécifiques du langage oral: une approche constructiviste
Leroy, Sandrine ULg; Parisse, Christophe; Maillart, Christelle ULg

in Rééducation Orthophonique (2009), 238

The Construction and Usage-based Theory (CUT) combines two main approaches drawn from cognitive linguistics: construction grammar and usage-based theory. The CUT emphasizes the fact that language ... [more ▼]

The Construction and Usage-based Theory (CUT) combines two main approaches drawn from cognitive linguistics: construction grammar and usage-based theory. The CUT emphasizes the fact that language structures progressively emerge through the use of general cognitive processes. Most new forms produced by a child are built upon his/her own previous productions that he/she complexifies and generalizes to construct more abstract forms. These hypotheses have been tested with normally-developing children but have not yet been tested on children with specific language impairment (SLI). In this paper, we put forward several hypotheses drawn from constructivistic approaches to explain morphosyntactic difficulties displayed by children with SLI. Their goal is to create a theoretical framework for future behavioral studies. [less ▲]

Detailed reference viewed: 373 (53 ULg)
See detailLes difficultés rencontrées en matière sociale
Kefer, Fabienne ULg

in La loi du 4 mai 1999 instituant la responsabilité pénale des personnes morales (2005)

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See detailDifficultés scolaires : comment améliorer la méthode de travail par l'Education cognitive
Frenkel, Stéphanie ULg

Scientific conference (2013, March 14)

De plus en plus d'élèves ont des difficultés liées à leur façon d'apprendre. Nombre d'entre eux présentent un point commun : ils n'ont pas pleinement développé leurs compétences métacognitives. L'élève n ... [more ▼]

De plus en plus d'élèves ont des difficultés liées à leur façon d'apprendre. Nombre d'entre eux présentent un point commun : ils n'ont pas pleinement développé leurs compétences métacognitives. L'élève n'exploite pas pleinement son potentiel d'apprentissage, il n'a pas développé un niveau suffisant de connaissances sur lui (ses points forts, ses points faibles, son style d'apprentissage ...) ni ses stratégies de haut niveau (anticipation, planification, contrôles et transfert). A cela, s'ajoutent des aspects psychoaffectifs aggravants (faibles objectifs d'apprentissage, faible estime de soi, démobilisation scolaire ...). Incluant une définition de la métacognition, il s'agira notamment d'étudier les actions possibles à l'aide d'outils et de méthodes notamment issus de l'Education cognitive. [less ▲]

Detailed reference viewed: 189 (11 ULg)
See detailDiffraction in high-energy physics. Proceedings, 3rd International Workshop, Diffraction 2004, Cala Gonone, Italy, September 18-23, 2004
Fiore, Roberto; Papa, Alessandro; Ivanov, Igor ULg et al

Book published by Elsevier Science (2005)

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See detailA Diffraction Model for Acoustical Ray-Tracing Based on the Energy Flow Lines Concept
Billon, Alexis; Embrechts, Jean-Jacques ULg

in Acta Acustica United with Acustica (2013), 99

Geometrical acoustics models are currently the most popular prediction tools in room-acoustics due to their low computing load. However, they seldom take into account the diffraction occurring at free ... [more ▼]

Geometrical acoustics models are currently the most popular prediction tools in room-acoustics due to their low computing load. However, they seldom take into account the diffraction occurring at free edges. Moreover, the existing diffraction models implemented in geometrical acoustics algorithms are either limited to specularly reflected paths or either present excessive computation load. Recently, a diffraction model based on an approximation of the far-field direction of the Poynting’s vector around half-planes has been introduced for computing the scattering due to faceted dielectric objects. In this article, this model is developed to handle obliquely incident waves and is implemented within an acoustic ray-tracing software using the analogy between the Poynting’s and the acoustic intensity vectors. The proposed model can handle both diffuse and specular reflections and sets no limit in terms of reflection or diffraction order. The first results obtained by ray-tracing agree well with the uniform theory of diffraction and the boundary elements method for single and double diffraction problems even if the interference effects are neglected and as long as the number of emitted rays is sufficient. Moreover, the additional computation load to handle diffraction is shown to be low compared to the one from a classical ray-tracing algorithm. [less ▲]

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See detailDiffraction with Gauss-Hermite beams
Stijns, Erik; Roose, Stéphane ULg

Conference (1994, April 04)

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See detailDiffractive straylight rejection system for wide field imagers. Design, performance and application to the STEREO solar space mission.
Halain, Jean-Philippe ULg

Doctoral thesis (2012)

Space-born wide field imagers have become a new tool used in the frame of Solar Physics and in particular in the field of Space Weather. One particular application is the tracking of coronal mass ejection ... [more ▼]

Space-born wide field imagers have become a new tool used in the frame of Solar Physics and in particular in the field of Space Weather. One particular application is the tracking of coronal mass ejection (CME), generated by violent eruptions on the sun’s surface, that propagates in the heliosphere. The CME brightness however rapidly decreases with the distance from the Sun. To reach a sufficient signal to noise ratio and follow CME away from the Sun, a high sensitivity is therefore required and the unwanted parasitic light (so called straylight) must be minimized. In particular, the Sun disk brightness must be occulted by a highly rejecting baffle system. A multi-edge diffractive baffle can provide a very high level of straylight attenuation for nearly collimated light source. A model of the multi-edge diffractive rejection has been implemented on the basis of the Fresnel diffraction theory. It allows the design and optimisation of such diffractive baffle as function of the instrument and observing geometries. The model was validated on a diffractive baffle mock-up, providing rejection down to an un-precedent level of 10-10 of the input flux. The model of multi-edge diffractive baffle has been applied to the specific configuration of the Heliospheric Imager (HI), on-board the NASA scientific Solar Terrestrial Relations Observatory (STEREO) mission, as part of its overall straylight reduction. The STEREO-HI baffle performance has been validated on a prototype and during the final end-to-end calibration of the flight instrument. After launch, the in-flight straylight level has been quantified, showing a very good correspondence with the on-ground measurements. The straylight evolution has also been shown to be stable during the mission, showing the baffle efficiency does not degrade with the space environment. The STEREO-HI instrument achieves a 10-13 rejection level, or greater, of the solar brightness at the detector pixel level. This instrument is the first wide field space imager viewing from outside the Sun-Earth line, and therefore able to directly follow the propagation of CME from the Sun to the Earth with a high accuracy and sensitivity. Since its launch, it provides unprecedented images and information on solar wind and CME propagation and evolution in the heliosphere. The next generation of wide-field solar imagers are under development for the ESA Solar Orbiter and NASA Solar Probe Plus missions. Their concept benefits from of the STEREO-HI front diffractive baffle system and is based on a multi-edge diffractive baffle to protect their cameras from solar disk brightness. The straylight calibration of these two instruments is in preparation and will be performed at the Centre Spatial de Liège with the tools and methods developed in the frame of the present work. [less ▲]

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See detailDiffuse cortical atrophy in a patient with Turner syndrome and Leber hereditary optic neuropathy
Blaise, Pierre ULg; Fumal, Arnaud ULg; Janin, Nicolas ULg et al

in Journal of Neurology (2005), 252(2), 232-233

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See detailDiffuse dermal angiomatosis: A previously undescribed pattern of immunoglobulin and complement deposits in two cases.
Quatresooz, Pascale ULg; Fumal, Isabelle; Willemaers, Valentine et al

in American Journal of Dermatopathology (2006), 28(2), 150-4

Two cases of diffuse dermal angiomatosis are reported in middle-aged women. This rare disease of unknown origin is characterized by increased dermal angiomatosis and ulceration. The clinical and ... [more ▼]

Two cases of diffuse dermal angiomatosis are reported in middle-aged women. This rare disease of unknown origin is characterized by increased dermal angiomatosis and ulceration. The clinical and histologic presentations of the presently reported lesions were typical for this disorder. Endothelial cells exhibited a normal immunophenotype. The perivascular basement membranes showed a distribution of collagen alpha chains typical for blood vessels, but not for lymphatics. Immunohistochemistry revealed other undescribed features. At the site of the clinical lesions, linear and granular deposits of immunoglobulins A and M, and complement were found around the vessels and at the dermal-epidermal junction. The same deposits were also found restricted to the dermal-epidermal junction in the peripheral clinically intact skin. No serological signs of auto-immune disorder were detected in one patient. A monoclonal gammopathy was disclosed in the other patient. A pattern of immunoreactant deposits similar to that disclosed in the two patients was not found in the control specimens, and has not been described so far in other types of vascular hyperplasia and neoplasia. A pathogenic role of these deposits is unsettled and should be further explored. [less ▲]

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See detailDiffuse large B-cell lymphoma of Waldeyer's ring has distinc clinicopathologic features: a GELA study.
de Leval, Laurence ULg; Bonnet, Christophe ULg; Copie-Bergman, C. et al

in Annals of Oncology (2012), 23(12)

Background Diffuse large B-cell lymphomas (DLBCLs) arising in specific extranodal sites have peculiar clinicopathologic features. Patients and methods We analyzed a cohort of 187 primary Waldeyer's ring ... [more ▼]

Background Diffuse large B-cell lymphomas (DLBCLs) arising in specific extranodal sites have peculiar clinicopathologic features. Patients and methods We analyzed a cohort of 187 primary Waldeyer's ring (WR) DLBCLs retrieved from GELA protocols using anthracyclin-based polychemotherapy. Results Most patients (92%) had stage I–II disease. A germinal center B-cell-like (GCB) immunophenotype was observed in 61%, and BCL2 expression in 55%, of WR DLBCLs. BCL2, BCL6, IRF4 and MYC breakpoints were observed in, respectively, 3 of 42 (7%), 9 of 36 (25%), 2 of 26 (8%) and 4 of 40 (10%) contributive cases. A variable follicular pattern was evidenced in 30 of 68 (44%) large biopsy specimens. The 5-year progression-free survival (PFS) and the overall survival (OS) of 153 WR DLBCL patients with survival information were 69.5% and 77.8%, respectively. The GCB immunophenotype correlated with a better OS (P = 0.0015), while BCL2 expression predicted a worse OS (P = 0.037), an effect overcome by the GCB/non-GCB classification. Compared with matched nodal DLBCLs, WR DLBCLs with no age-adjusted international prognostic index factor disclosed a better 5-year PFS rate (77.5% versus 70.7%; P = 0.03). Conclusions WR DLBCLs display distinct clinicopathologic features compared with conventional DLBCLs, with usual localized-stage disease, common follicular features and a high frequency of GCB immunophenotype contrasting with a low rate of BCL2 rearrangements. In addition, they seem to be associated with a better outcome than their nodal counterpart. [less ▲]

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See detailDiffuse urban and industrial groundwater pollution with metallic trace elements A comparison between affected and unaffected areas
Gesels, Julie ULg; Dollé, Fabien ULg; Leclercq, Julie et al

Poster (2013, April 22)

For metalic trace elements, spatially distributed background concentrations will be defined as a function of geological and hydrogeological context and considering the impact of diffuse pollution.

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See detailDiffuse urban and industrial groundwater pollution with metallic trace elements: a comparison between affected and unaffected areas
Gesels, Julie ULg; Dollé, Fabien ULg; Leclercq, Julie et al

Poster (2012, September 20)

For metalic trace elements, spatially distributed background concentrations will be defined as a function of geological and hydrogeological context and considering the impact of diffuse pollution.

Detailed reference viewed: 51 (15 ULg)
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See detailDiffuse xanthomatosis as a presenting feature of multiple myeloma.
Segner, Sophie; Theate, Ivan; Poire, Xavier et al

in European Journal of Haematology (2010), 84

Detailed reference viewed: 17 (3 ULg)