Present-day vertical crustal motion and active faulting in the Roer graben

Conference (2003)

Flexible implementation of the finite element method applied to 3D coupled problems considering convective effects

Doctoral thesis (2003)

Assessment of mechanobiological models for the numerical simulation of tissue differentiation around immediately loaded implants.

in Computer Methods in Biomechanics & Biomedical Engineering (2003), 6(5-6), 277-88

Nowadays, there is a growing consensus on the impact of mechanical loading on bone biology. A bone chamber provides a mechanically isolated in vivo environment in which the influence of different ... [more ▼]

Nowadays, there is a growing consensus on the impact of mechanical loading on bone biology. A bone chamber provides a mechanically isolated in vivo environment in which the influence of different parameters on the tissue response around loaded implants can be investigated. This also provides data to assess the feasibility of different mechanobiological models that mathematically describe the mechanoregulation of tissue differentiation. Before comparing numerical results to animal experimental results, it is necessary to investigate the influence of the different model parameters on the outcome of the simulations. A 2D finite element model of the tissue inside the bone chamber was created. The differentiation models developed by Prendergast, et al. ["Biophysical stimuli on cells during tissue differentiation at implant interfaces", Journal of Biomechanics, 30(6), (1997), 539-548], Huiskes et al. ["A biomechanical regulatory model for periprosthetic fibrous-tissue differentiation", Journal of Material Science: Materials in Medicine, 8 (1997) 785-788] and by Claes and Heigele ["Magnitudes of local stress and strain along bony surfaces predict the course and type of fracture healing", Journal of Biomechanics, 32(3), (1999) 255-266] were implemented and integrated in the finite element code. The fluid component in the first model has an important effect on the predicted differentiation patterns. It has a direct effect on the predicted degree of maturation of bone and a substantial indirect effect on the simulated deformations and hence the predicted phenotypes of the tissue in the chamber. Finally, the presence of fluid also causes time-dependent behavior. Both models lead to qualitative and quantitative differences in predicted differentiation patterns. Because of the different nature of the tissue phenotypes used to describe the differentiation processes, it is however hard to compare both models in terms of their validity. [less ▲]

Le passé récent, la réforme de l'impôt des personnes physiques, le cas des villes

in Bulletin de Documentation du Ministère des Finances (2003)

A new formulation of internal forces for non-linear hypoelastic constitutive models verifying conservation laws

in Bathe, K. J. (Ed.) Second MIT Conference on Fluid and Solid Mechanics (2003)

This paper proposes a new formulation of the internal forces for hypoelastic constitutive models ensuring that the elastic work of deformation can be restored by the scheme. Moreover, we demonstrate that ... [more ▼]

This paper proposes a new formulation of the internal forces for hypoelastic constitutive models ensuring that the elastic work of deformation can be restored by the scheme. Moreover, we demonstrate that the work of the plastic deformation is positive and consistent with the material model. [less ▲]

VLT Observations of two Unusual BAL Quasars

in Active Galactic Nuclei: From Central Engine to Host Galaxy. ASPC 290 (2003)

The SDSS has confirmed the existence of populations of broad absorption line quasars with extreme properties. I will discuss the discovery of redshifted absorption troughs (confirmation of a rotating disk ... [more ▼]

The SDSS has confirmed the existence of populations of broad absorption line quasars with extreme properties. I will discuss the discovery of redshifted absorption troughs (confirmation of a rotating disk wind?), absorption from FeIII but not FeII (a very large column density of moderately ionized gas?), extremely reddened objects (extinction curves even steeper than that of the SMC), objects with overlapping troughs that remove 90% of the flux below MgII, and two mysterious objects which may or may not be unusual BALs. Implications of these objects for quasar and BAL outflow models will be discussed, along with preliminary results of various followup observations. [less ▲]

Identification de la place des chercheurs et des praticiens dans la recherche sur l’intervention dans les APS

in Cloes, Marc (Ed.) L’intervention dans les Activités physiques et sportives : rétro/perspectives (2003)

La recherche sur l'Intervention dans les Activités Physiques et Sportives (APS) est a donné une place privilégiée aux chercheurs dans le sens où ces derniers ont guidé majoritairement les choix des thèmes ... [more ▼]

La recherche sur l'Intervention dans les Activités Physiques et Sportives (APS) est a donné une place privilégiée aux chercheurs dans le sens où ces derniers ont guidé majoritairement les choix des thèmes de recherche et laissé aux sujets un rôle secondaire. L'évolution actuelle met clairement en évidence le besoin de les impliquer davantage. En se basant sur une analyse de la littérature spécifique au domaine des APS, ce texte tente ainsi de faire ressortir l'intérêt des recherche-action. [less ▲]

Event-related potentials to emotional and neutral stimuli in alcoholism.

in Neuropsychobiology (2003), 48(2), 77-81

Several studies have demonstrated that the emotional value of stimuli affects P300 amplitude. In the present study, the influence of alcohol-related stimuli in alcoholic patients was investigated ... [more ▼]

Several studies have demonstrated that the emotional value of stimuli affects P300 amplitude. In the present study, the influence of alcohol-related stimuli in alcoholic patients was investigated. Subjects were 10 alcoholic inpatients (3 female) and 10 age- and sex-matched controls. Eight alcohol-related and 8 neutral words served as stimuli in a visual oddball paradigm. Acohol-related words were targets (48 stimuli, 33%) and neutral words were standard stimuli (96 stimuli, 66%). Results showed that P300 amplitude for targets did not differ significantly between the two groups. However, P300 latency for targets as well as reaction time were significantly shorter in male alcoholic patients. In contrast, P300 latency was increased in female alcoholic patients but reaction time did not differ. These results suggest that male alcoholics process information linked to alcohol cues more rapidly than neutral cues, probably because a specific semantic network is activated in these patients. The decreased reaction time confirms the impulsive behavior frequently found in male alcoholism, as it has been described in type II alcoholism. Besides, the results imply that information processing was delayed in female alcoholic patients. Therefore this study demonstrates a gender-dependent impact of alcohol-related stimuli on information processing. [less ▲]

Jean Michel-Bonvin : Figures de sociologues. Introduction à l'epistémologie sociologique

in Schweizerische Zeitschrift für Soziologie = Revue Suisse de Sociologie (2003), 29

Jean-Michel Bonvin introduces the reader to the sociological method through the study of eight classical sociologists throught the 19th and 20th centurites : Comte, Tocqueville, Marx, Durkheim, Weber ... [more ▼]

Jean-Michel Bonvin introduces the reader to the sociological method through the study of eight classical sociologists throught the 19th and 20th centurites : Comte, Tocqueville, Marx, Durkheim, Weber, Simmel, Goffman and Parsons [less ▲]

L'université impossible. Le savoir dans la démocratie de marché

Book published by Labor (2003)