"Apprentissage et enseignement de la langue maternelle et d'une langue étrangère"

Conference (2003, March)

"Enseignement et coaching"

Conference (2003, March)

Development of a metrology and figuring machine for large X-ray mirror

Conference (2003, February 20)

To improve the image quality of X-ray replicated mirror, A new metrology machine has been built link to a ion beam figuring machine. The first one allows to accurately measure the shape of replicated X ... [more ▼]

To improve the image quality of X-ray replicated mirror, A new metrology machine has been built link to a ion beam figuring machine. The first one allows to accurately measure the shape of replicated X-ray mirrors. The machine is dedicated to cylindrical mirrors shape whose dimensions can vary from 50 to 800 mm in height and 600 to 800 mm in diameter. The present contribution will sum up the results achieved with this machine on an actual mirror. The machine calibration results and the data analysis to obtain the mirror final shape will be detailed. The final results are compared with other measurements performed by a traditional 3-D machine. The second one is a dedicated ion figuring machine dedicated for the figuring of the X-ray mirrors. The preliminary tests were undertaken to evaluate the ion figuring process on Nickel replicated surfaces. Those results were used to improve the design of the figuring machine, a detailed description of that machine follows. The reliability of the ion figuring process is shown through an actual problem. Finally, some leading remarks about the improvements of the ion figuring ion machine and the ion figuring process in general are drawn. [less ▲]

Properties of localized, high latitude, dayside aurora

Conference (2003, February 19)

[1] The FUV instrument on the IMAGE spacecraft frequently observes intense ultraviolet (UV) emission from a localized dayside region poleward of the general auroral oval location. One type of these ... [more ▼]

[1] The FUV instrument on the IMAGE spacecraft frequently observes intense ultraviolet (UV) emission from a localized dayside region poleward of the general auroral oval location. One type of these emissions has been described as the signature of direct proton precipitation into the cusp after lobe reconnection during northward interplanetary magnetic field (IMF) and high solar wind dynamic pressure periods [Frey et al., 2002]. Here we describe a completely different type of high latitude aurora, which does not show any signature of precipitating protons. It also occurs during northward IMF conditions however, only during periods of very low solar wind dynamic pressure. It occurs at a much higher geomagnetic latitude than the normal cusp location and only during periods of positive IMF By. The intensity of the UV emission is somewhat anti-correlated with the solar wind dynamic pressure, much in contrast to the cusp emission. The brightness of the localized emission changes rapidly on time scales between 30 and 70 minutes without corresponding changes in solar wind properties. Coincident measurements by the FAST spacecraft verify that this is not the cusp, that ion precipitation is absent in these regions, and that strong precipitation of field-aligned accelerated electrons causes the aurora. We interpret this aurora as the optical signature of electron precipitation in the upward leg of a current system which closes the downward leg of the current system into the cusp in the ionosphere. [less ▲]

Etude ALLHAT : intérêt

Conference (2003, February 13)

« Analyse de deux figures des migrants ruraux dans la presse de Shenzhen : ‘inclusion’ et ‘exclusion’

Conference (2003, January 31)

L'importance de la langue dans la littérature post-coloniale, en particulier dans le domaine anglophone

Conference (2003, January 21)

Etude comparative de la tolérance cutanée de nouveaux dérivés amphiphiles de cyclodextrines: les phospholipidyl-cyclodextines

Conference (2003, January)

Etude de l'inclusion du miconazole dans les cyclodextrines par le CO2 supercritique: caracterisation des complexes par HPLC, CP-MAS-NMR et FT-IR

Conference (2003, January)

Appliquer le nez électronique pour reconnaître et suivre en continu de mauvaises odeurs dans l'environnement

Conference (2003, January)

Le nez électronique avec une configuration très simple fournit des résultats encourageants pour détecter une odeur dans l’environnement. Il existe un réel espoir de pouvoir fabriquer des instruments ... [more ▼]

Le nez électronique avec une configuration très simple fournit des résultats encourageants pour détecter une odeur dans l’environnement. Il existe un réel espoir de pouvoir fabriquer des instruments portables capables de prévoir une odeur inconnue en temps réel sur le terrain. Le monitoring des odeurs environnementales est un challenge, mais une simple estimation est suffisante, il n'y a pas besoin de conditions opératoires très rigoureuses. Il reste néanmoins beaucoup de travail à faire avant que le nez électronique ne devienne une réalité dans l’environnement. La communication présente ce challenge en l'illustrant par de nombreuses applications réalisées par l'équipe de recherche. [less ▲]

A spectroscopic determination of singlet oxygen quantum yield of PPME in different solvents

Conference (2003)

Agregation study of the pyropheophorbide- a metyl ester in ethanol aqueous solution and liposomes

Conference (2003)

Modeling of the influence of electric forces on mechanical structures

Conference (2003)

This paper is a summary concerning the modeling of the strong electro-mechanical coupling appearing in micro-electro-mechanical systems (MEMS). These systems are very small devices (typical size of a few ... [more ▼]

This paper is a summary concerning the modeling of the strong electro-mechanical coupling appearing in micro-electro-mechanical systems (MEMS). These systems are very small devices (typical size of a few microns), in which electric phenomena as well as mechanical and dynamical phenomena exist. The finite element method is used to discretize simultaneously the electrostatic and mechanical fields. The formulation is consistently derived from variational principles based on the electro-mechanical free energy. In classical weakly coupled formulations staggered iteration is used between the electrostatic and the mechanical domain. Therefore, in those approaches, linear stiffness is evaluated by finite differences and equilibrium is reached typically by relaxation techniques. The strong coupling formulation presented here allows to derive exact tangent matrices of the electro-mechanical system. Thus it allows to compute non-linear equilibrium positions using Newton- Raphson type iterations combined with adaptive meshing in case of large displacements. Furthermore, the tangent matrix obtained in the method considered in this paper greatly simplifies the computation of vibration modes and frequencies of the coupled system around equilibrium configurations. The non-linear variation of frequencies with respect to voltage and stiffness can then be investigated until pull-in appears. In order to illustrate the effectiveness of the proposed formulation numerical results are shown first for the reference problem of a simple flexible cap acitor, then for the model of a micro-bridge. [less ▲]

Electromagnetic force density in a ferromagnetic material

Conference (2003)

Quantification of Angiogenesis of Embryonic Implantation Site by Image Analysis

Conference (2003)

Modulation of selectivity for the enantiomeric separation of basic compounds in non-aqueous CE using anionic cyclodextrins in combination with ion-pairing re-agents

Conference (2003)

Liquid distribution in a packed column : comparison between images obtained by X-ray computed tomography and by electrical capacitance tomography

Conference (2003)

Hydrogen peroxyde in breath condensate as marker of lower airway inflammation in an experimental model of feline asthma

Conference (2003)

Approche pratique et intégrée d’un troupeau avec des pathologies néonatales

Conference (2003)

Screening of histone deacetylase (HDAC) expression profiles in prostate cancer tissues leads to the identification of HDAC8 as a novel marker of smooth muscle differentiation

Conference (2003)

Background: Histone deacetylation mediated by histone deacetylases (HDAC) plays a key role in the regulation of gene expression. Inhibition of HDAC activity is associated with profound alterations in ... [more ▼]

Background: Histone deacetylation mediated by histone deacetylases (HDAC) plays a key role in the regulation of gene expression. Inhibition of HDAC activity is associated with profound alterations in cellular biology, such as cell growth arrest, apoptosis and differentiation. It has been hypothesized that altered HDAC expression and/or activity could play a role in cancer development and progression. Objectives: To investigate this possibility, we undertook a study in which we screened HDAC expression profiles in human prostate cancer. In addition, we sought to determine the specific biological effects of selected HDACs. Methods: A variety of techniques, including immunochemistry, Q-RT-PCR, and immunobloting, were used to examine the expression of several class I and class II HDACs in human prostate cancer cell lines and matched malignant and non-malignant prostate tissues. Analysis of the specific biological effects of selected HDACs was performed after knocking down their expression with the use of specific small interfering RNAs (siRNA) and/or after forcing their overexpression by transfection of the cDNAs of interest. Results: Normal prostate epithelial and stromal cells displayed distinct HDAC expression profiles, suggesting specific functions for these enzymes in the prostate. Human prostate cancer cells did not exhibit significant alterations in the abundance of any of the HDAC enzymes analyzed. One of the HDACs tested, herein referred to as HDACX, was specifically expressed, in vivo, by cells showing smooth muscle phenotype, including vascular and prostate smooth muscle cells and myoepithelial cells. HDACX expression co-localized with the expression of the specific smooth muscle marker alpha smooth muscle actin (alpha-SMA) in all human tissues tested. Nucleo-cytoplasmic fractionation experiments showed that HDACX was mainly expressed in the cytosol of human smooth muscle cells (HSMC) obtained from umbilical cord veins. Transfection experiments leading to overexpression of HDACX in mouse fibroblasts indicated that the enzyme was detected both in the cytosol and in the nucleus. By immunocytochemistry, it was observed that HDACX pattern of expression was reminiscent of actin stress fibers, suggesting that this HDAC may be involved in the regulation of the smooth muscle cell cytoskeleton. Trichostatin A (TSA), a specific global HDAC inhibitor, as well as specific HDACX siRNAs, were able to completely prevent the TGFß1-induced differentiation of fibroblasts into myofibroblasts, as assessed by alpha-SMA abundance. Forced downregulation of HDACX by siRNAs in HSMC caused a dramatic reduction in their contraction capacity, as determined with the use of hydrated collagen lattices contraction assays. Conclusions : HDACs diplay distinct expression profiles among normal prostate epithelial and stromal cells. The abundance of the HDACs analyzed in this study is not altered in prostate cancer. Further experiments are required to determine whether the activity of these enzymes is altered in prostate cancer. We have identified for the first time an HDAC that (i) is specifically expressed in cells showing smooth muscle phenotype, (ii) is required for myofibroblastic differentiation, and (iii) is involved in smooth muscle cell contraction. This HDAC may become a target for the therapy of several pathological conditions, including chronic inflammation and cancer, in which myofibroblasts play a major role. [less ▲]

Physical function is the most severely impaired health-related quality of life dimension during the aging process

Conference (2003)

Villes-Santé en pratique : Mettre en oeuvre ou redynamiser l'action locale

Conference (2003)

Assignment techniques on Virtual Networks: Performance considerations on large multi-modal networks

Conference (2003)

Assignment techniques on Virtual Networks, Performance considerations on large multi-modal networks

Conference (2003)

Apport des volumes de Fresnel en tomographie sismique

Conference (2003)

Hard ticks (Acarina, Ixodidae) found on domestic carnivores in Belgium: A survey conducted during three consecutive years

Conference (2003)

Echinococcus multilocularis in Wallonia (Southern Belgium): spatial distribution of carriage by the red fox (Vulpes vulpes) and preliminary results in the Musk rat (Ondatra zibethicus), a potentially important intermediate host

Conference (2003)

Survey of cat and dog dermatophytosis in Europe. The ECMM working group report.

Conference (2003)

A recombinant 31.5 kDa keratinase and a crude exo-antigen from Microsporum canis fail to protect against a homologous experimental infection in guinea pigs

Conference (2003)

Comparison of extraction yield and selectivity between supercritical fluid and classical methods of tagitinin C extraction

Conference (2003)

Comment tenir compte des enjeux sous-jacents à la notion de compétence dans la validation des compétences professionnelles ?

Conference (2003)

Evaluation of the specific immune response against a recombinant keratinase of Microsporum canis

Conference (2003)

Local Hydrological effects in Membach, Belgium: influence on the long term gravity variation

Conference (2003)

Data fusion between X-ray computed tomography and electrical capacitance tomography images obtained on an absorption columns

Conference (2003)

Vivre la démarche expérimentale, de la Haute Ecole vers l'école primaire

Conference (2003)

Magnetosusceptibility, sedimentology and biostratigraphy at the Frasnian/Famennian boundary between southern France and eastern Belgium

Conference (2003)

Soft tissue imaging of the palmar aspect of the equine podotrochlear apparatus.

Conference (2003)

Diversity and complexity of Early Eukaryotic cells

Conference (2003)

Normes et textes en vigueur pour la validation

Conference (2003)

Harmonization of validation strategies for analytical methods

Conference (2003)

Harmonisation des démarches de validation, est-elle possible ?

Conference (2003)

Enantiomeric separation of basic pharmaceuticals in non-aqueous capillary electrophoresis using an anionic cyclodextrin in combination with an ion-pairing reagent

Conference (2003)

Discharge management for frail geriatric patients : effects of an implementation project

Conference (2003)

Les interactions médicamenteuses

Conference (2003)

Intoxications aiguës au méthanol et à l'éthylène glycol

Conference (2003)

Mechanical behaviour of chalk reservoir: Numerical modelling of water sensitivity and time dependence effects

Conference (2003)

The paper proposes two numerical models ot the mechanical behaviour of chalk. First, an elasto-plastic constitutive law reproduces the different plastic mechanisms of the chalk and the influence of pore ... [more ▼]

The paper proposes two numerical models ot the mechanical behaviour of chalk. First, an elasto-plastic constitutive law reproduces the different plastic mechanisms of the chalk and the influence of pore fluids by introducing the concept of suction. Secondly, a model able to reproduce time dependence behaviour. Eventually, the paper gives a simulation of an academic reservoir during depletion and waterflooding phase. [less ▲]

Disorders of lambs thyroid by a glucosinolate metabolite: the 5-vinyl-l,3-oxazolidine-2-thione (5-VOT)

Conference (2003)

The impact of 5-VOT on thyroid was studied in two lambs. They received ad libitum water, hay and concentrates without rapeseed from ten days of age till weaning (65 days of age). At 85 days of age, one of ... [more ▼]

The impact of 5-VOT on thyroid was studied in two lambs. They received ad libitum water, hay and concentrates without rapeseed from ten days of age till weaning (65 days of age). At 85 days of age, one of them was fed with the same diet but mixed with 100g/d of a rapeseed containing high level of progoitrin: 71.4µmol/g DM (variety Jet Neuf). Blood samples were taken fortnightly for the determination of TSH (Thyroid Stimulating Hormone), T3 (Tri-iodothyronin) and T4 (thyroxin) plasma concentrations. [less ▲]

The Radcalwet observation campaign: relative and absolute calibration of WVR's

Conference (2003)

Electrophysiological and behavioral study of some secondary metabolites from Tribolium confusum (DuVal) (Coleoptera, Tenebrionidae)

Conference (2003)

Increased hydrogen peroxide in breath condensate after aero-allergen challenge in ascaris-suum sensitived cats

Conference (2003)