Un autre regard sur le rapport de vraisemblance pour le test d'homogénéité et les comparaisons multiples

Scientific conference (2006, June)

Applications de l’échographie en reproduction équine

Scientific conference (2006, June)

Cushing's in human medicine

Scientific conference (2006, June)

The Concept of Tax in Europe

Scientific conference (2006, June)

Qu’est-ce que la justice des systèmes éducatifs et comment la mesurer?

Scientific conference (2006, May 26)

The inner debris disk of Vega as seen by CHARA/FLUOR

Scientific conference (2006, May 25)

Using the FLUOR beam-combiner installed at the CHARA Array (Mt Wilson, CA), we have obtained high-precision visibility measurements of Vega, one of the prototypic debris-disk stars, known to be surrounded ... [more ▼]

Using the FLUOR beam-combiner installed at the CHARA Array (Mt Wilson, CA), we have obtained high-precision visibility measurements of Vega, one of the prototypic debris-disk stars, known to be surrounded by a large amount of cold dust in a ring-like structure at 80-100 AU. The combination of short and long baselines has allowed us to separately resolve the stellar photosphere and the close environment of the star (<8 AU). Our observations show a significant deficit in square visibility at short baselines with respect to the expected visibility of a simple UD stellar model (dV2 ~ 2%), suggesting the presence of an extended source of emission around Vega. The sparse (u,v) plane coverage does not allow the discrimination between a point source and an extended circumstellar emission as the source of the extended emission. However, we show that the presence of a point-like source within the FLUOR field-of-view (1" in radius, i.e., 7.8 AU at the distance of Vega) is highly unlikely. The excess emission is most likely due to the presence of hot circumstellar dust in the inner part of Vega's debris disk, with a flux ratio of 1.29 +/- 0.19% between the integrated dust emission and the stellar photosphere. Complementing this result with archival photometric data in the near- and mid-infrared and taking into account a realistic photospheric model for the rapidly rotating Vega, we derive the expected physical properties of the circumstellar dust by modelling its Spectral Energy Distribution. The inferred properties suggest that the Vega system could be currently undergoing major dynamical perturbations. [less ▲]

Vega: the star with comets?

Scientific conference (2006, May 19)

Techniques tomographiques : des instruments de mesure de choix en génie chimique

Scientific conference (2006, May 17)

Le Secret des Géants

Scientific conference (2006, May 05)

Traitement médical des adénomes non fonctionnels - Agonistes somatostatinergiques

Scientific conference (2006, May)

La question de la vérité en anthropologie.

Scientific conference (2006, May)

Ethnic Mobilization in the New Europe

Scientific conference (2006, April 22)

Nouvelles menaces sur la vie privée et sensibilité à la surveillance dans une configuration post-orwellienne

Scientific conference (2006, April 10)

High efficiency biolistic transformation can be used to insert complex I mutations in the unicellular green alga Chlamydomonas reinhardtii,

Scientific conference (2006, April)

Le rôle des marchés fonciers dans la production des nouveaux espaces résidentiels en Belgique

Scientific conference (2006, March 29)

Tension entre approche apriorique et approche historique de l’œuvre en histoire de l’art (Warburg, Panofsky, Damisch, Didi-Huberman)

Scientific conference (2006, March 24)

Cognitive and affective mechanisms involved in hallucination-proneness

Scientific conference (2006, March 22)

Histoire littéraire et théorie du discours: le cas du nouveau réalisme en Flandre

Scientific conference (2006, March 17)

This paper investigates the ways in which the tool box of discourse theory can be used for writing literary history. These possibilities are explored by looking at the case of literary new realism in ... [more ▼]

This paper investigates the ways in which the tool box of discourse theory can be used for writing literary history. These possibilities are explored by looking at the case of literary new realism in Flanders. [less ▲]

GnRH and bovine reproduction

Scientific conference (2006, March 14)

Projet Khartês. Méthodes et outils d’analyse syntaxique

Scientific conference (2006, March 10)

Notre exposé (1) présente tout d'abord brièvement le projet Khartês (projet d'édition et d'étude de chartes origniales rédigées en français, Université de Liège). (2) Nous abordons ensuite la ... [more ▼]

Notre exposé (1) présente tout d'abord brièvement le projet Khartês (projet d'édition et d'étude de chartes origniales rédigées en français, Université de Liège). (2) Nous abordons ensuite la problématique générale de l'analyse syntaxique des états de langue qui ne sont plus pratiqués, comme l'ancien français des chartes médiévales. Ces observations nous mènent à décrire le modèle que nous avons élaboré et la manière dont nous l'avons mis en oeuvre. (3) L'aspect technique de notre travail fait l'objet de la suite de l'exposé, où nous montrons comment nous avons mis les outils informatiques actuels au service de notre démarche linguistique. (4) En posant aux textes la question de leur ponctuation, nous achevons notre exposé en montrant comment une analyse formalisée, systématisée et informatisée peut être employée pour partir à la découverte de faits qui seraient passés inaperçus à un oeil humain. [less ▲]

Le concept de “philosophie de la vie” est-il contradictoire ou tautologique ? (Rickert et Heidegger)

Scientific conference (2006, March 10)

Les nouveaux pouvoirs fiscaux des Régions et les principes généraux de droit civil et de droit fiscal applicable aux donations

Scientific conference (2006, March 06)

Objectifs de la construction d’une société interculturelle et rôle de la région wallonne

Scientific conference (2006, March 06)

Assurance qualité et management de la qualité.

Scientific conference (2006, March)

Signes de qualité produits.

Scientific conference (2006, March)

La traçabilité.

Scientific conference (2006, March)

Chirurgie du système nerveux périphérique

Scientific conference (2006, March)

Trois cas de syndrome myotonique

Scientific conference (2006, March)

Occupational activities and cognitive reserve: A frontier approach applied to SHARE

Scientific conference (2006, March)

The animal phylogeny and the fundamental importance of taxon sampling

Scientific conference (2006, February 20)

Heidegger et la philosophie de la religion : aperçu de quelques problèmes d’interprétation

Scientific conference (2006, February 08)

Les biais culturels dans les évaluations internationales

Scientific conference (2006, February 02)

Science et symbole. Libres propos autour des méthodes de recherche.

Scientific conference (2006, February)

Theoretically, a research worker tries to understand the unknown world around himself. To answer his question, he follows a road called scientific methodology. Is it the only possible way to find ? The ... [more ▼]

Theoretically, a research worker tries to understand the unknown world around himself. To answer his question, he follows a road called scientific methodology. Is it the only possible way to find ? The objective of this paper is to draw a picture introducing the scientific and the symbolic methodologies to approach new knowledges. [less ▲]

Transnationalisme Politique et Citoyenneté.

Scientific conference (2006, January 26)

« Le cas belge »

Scientific conference (2006, January 24)

Les béances glottiques: rééducation logopédique

Scientific conference (2006, January 13)

Le micromaser à atomes froids

Scientific conference (2006, January)

Admittance spectroscopy of semiconductor structures

Scientific conference (2006)

Admittance spectroscopy is a powerful tool for electrical characterization of semiconductor structures such as p-n junctions, Schottky diodes, light-emitting systems or quantum wells. It consists in ... [more ▼]

Admittance spectroscopy is a powerful tool for electrical characterization of semiconductor structures such as p-n junctions, Schottky diodes, light-emitting systems or quantum wells. It consists in monitoring the complex admittance of the overall device under test as a function of frequency, applied dc voltage and temperature. This technique gives direct access to the emission-capture processes occurring between an impurity level and the conduction or the valence band and leads to the determination of important electronic properties including the activation energy and the carrier capture cross sections. However, the interpretation of the admittance curves is straightforward only under restrictive assumptions such as full ionization of the shallow dopant, with a concentration larger than the deep impurity concentration. Numerical simulations, based on the solution of the basic semiconductor equations, allow to carry out a detailed analysis of the steady-state and small-signal electrical characteristics of the systems and thus contribute to a better understanding of the conduction mechanisms and of the microscopic origin of the features in the experimental admittance spectra. In this presentation, the results obtained for three different structures are shown in order to illustrate the method. In the first case, the role of Mg in GaN Schottky diodes is investigated. The results of the study show that this acceptor has simultaneously the functions of dopant and of deep impurity. In order to explain the electrical behavior of Mg, thermal admittance spectroscopy measurements are performed on Schottky structures based on Mg-doped GaN layers grown by metalorganic vapor phase epitaxy on sapphire. The analysis is carried out by simulating the electrical characteristics of the device. The calculated curves fully reproduce the experimental results and the microscopic parameters are determined by an optimized fitting procedure, based on the comparison of the electrical characteristics obtained from the numerical simulations to those of the experiment. In the second example, charge-carrier mobility in organic materials is evaluated. The frequency- dependent complex admittance and impedance of the structure consisting of the organic layer, grown by thermal evaporation and sandwiched by metallic electrodes, are measured as functions of the dc bias. The capacitance-versus-frequency curve exhibits a minimum, the frequency-position of which increases with the applied dc voltage. Based on numerical calculations, the theoretical analysis shows that the inductive contribution to the capacitance originates from the modulation of the free carrier concentration in the organic material. The finite carrier transit time determines the frequency-response of the structure. Moreover, the low-frequency behavior of the capacitance curves can be explained by the presence of a band of defect states that modifies the charge distribution within the device. As third application of the admittance spectroscopy method, the electrical characteristics of an organic light-emitting diode are numerically simulated for the dc and the ac regimes. This approach allows to obtain a detailed microscopic description of the dependences of the carrier concentrations and current densities on the applied steady-state voltage and the modulation frequency. The fitting of the resulting admittance and impedance curves to the response of an equivalent electrical circuit shows that each element can be associated with a particular region of the structure. It is then possible to correlate the dependence of each feature of the admittance and impedance curves with one or several parameters of the material system. [less ▲]

Identification of accessible proteins expressed in human breast cancer

Scientific conference (2006)

Study of the role of histone deacetylases in myofibroblastic differenciation

Scientific conference (2006)

Regard croisé sur la contractualisation du droit administratif de l'économie : illustration sur le thème des partenariats public privé

Scientific conference (2006)

Des produits sains et naturels dans l'assiette des jeunes, une utopie ?

Scientific conference (2006)

e-Agora : a portal to support the use of e-learning at the University of Liege

Scientific conference (2006)

The APPEAR Method for guiding the valorisation of urban archaeological sites

Scientific conference (2006)

Seminar, “Change Detection and Similarity Afternoon”, Royal Military Academy (RMA)

Scientific conference (2006)

Explicit dynamic with X-FEM to handle complex geometries

Scientific conference (2006)

Evolution of early eukaryotes

Scientific conference (2006)

Manifestations neuromusculaires des soins intensifs

Scientific conference (2006)

Coactivateurs des récepteurs aux stéroïdes: modulation locale de l'activité des stéroïdes

Scientific conference (2006)

Pattern and process in landscape ecology

Scientific conference (2006)