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Search Results: 1 - 10 of 15858 matches for " Le Bellego Gael "
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Using a smart phone for information rendering in Computer-Aided Surgery
Le Bellego Gael,Marek Bucki,Ivan Bricault,Jocelyne Troccaz
Computer Science , 2011,
Abstract: Computer-aided surgery intensively uses the concept of navigation: after having collected CT data from a patient and transferred them to the operating room coordinate system, the surgical instrument (a puncture needle for instance) is localized and its position is visualized with respect to the patient organs which are not directly visible. This approach is very similar to the GPS paradigm. Traditionally, three orthogonal slices in the patient data are presented on a distant screen. Sometimes a 3D representation is also added. In this study we evaluated the potential of adding a smart phone as a man-machine interaction device. Different experiments involving operators puncturing a phantom are reported in this paper.
Towards a Reconsideration of Female Migration Patterns in Burkina Faso
Poirier, Jean,Piché, Victor,Le Jeune, Gael
Canadian Studies in Population , 2004,
Abstract: English This study focuses on changes in female migration patterns during the lastfiftyyears in Burkina Faso. We examine migration paths and reasons for movingbetween ages 12 and 25 for women of rural origin using event history datadrawn from the Migration Dynamics, Urban Integration and Environment inBurkina Faso National Survey conducted in 2000. The results show that femalemigration patterns are changing in a subtle and complex way. Women areemigrating more out of rural areas and experiencing increased multiple movetrajectories. Motives are also less-family driven and more related to educationand labour market considerations. French La présente étude s’intéresse aux changements qui ont affecté les migrationsféminines au Burkina Faso dans les cinquante dernières années. Nous examinonsles cheminements migratoires et les motifs de migration entre 12 et 25 ans chezles femmes d'origine rurale en nous basant sur l’Enquête Nationale Dynamiquemigratoire, insertion urbaine et environnement au Burkina Faso – 2000. Lesrésultats indiquent que les femmes sortent de plus en plus du milieu rural et ontdes trajectoires de plus en plus diversifiées. Les motifs sont de moins en moinsde nature familiale et davantage orientés vers l’éducation et le marché du travail.
Differences in MAP kinase phosphorylation in response to mechanical strain in asthmatic fibroblasts
Frédérique Le Bellego, Sophie Plante, Jamila Chakir, Qutayba Hamid, Mara S Ludwig
Respiratory Research , 2006, DOI: 10.1186/1465-9921-7-68
Abstract: Fibroblasts were obtained from mild, atopic asthmatics and non-atopic volunteers using endobronchial biopsy. Cells were grown on flexible, collagen I-coated membranes, and subjected to mechanical strain (Flexercell). MAP kinase phosphorylation was measured at baseline, and during one hour of strain. We also examined the effect of strain on proteoglycan production.At baseline, there was increased phosphorylation of ERK1/2 and p38, and decreased phosphorylation of JNK in AF vs NF. During strain in NF, p38 phosphorylation was increased. Conversely in AF, strain resulted in an increase in JNK phosphorylation, had no effect on phosphorylation of p38, and resulted in a decrease in ERK1/2 phosphorylation. There was a significant increase in versican protein production after 24 h strain in both AF and NF. JNK inhibition reversed the strain-induced increase in versican in NF, but had no effect in AF.These results show that there are phenotypic differences in MAP kinase phosphorylation in AF vs NF, and that different signaling pathways are involved in transducing mechanical stimuli in these two populations of cells.Mechanotransduction involves the ability of the cell to respond to mechanical strain with a biological message and alteration of protein production. Studies of lung cells in vitro have identified some of the intracellular signaling pathways that mediate this effect, which include members of the mitogen-activated protein (MAP) kinase signaling family. Phosphorylation of MAP kinases results in downstream phosphorylation of other signaling molecules, and ultimately, activation of transcription factors [1]. Cyclic stretch activates extracellular signal-regulated kinase (ERK) 1/2 in different types of pulmonary cells, including alveolar and bronchial epithelial cells [2-4] Mechanical strain also enhances p38 activation in bronchial epithelial cells and in parenchymal lung strips [3,5]. Finally, phosphorylation of c-Jun NH2-terminal kinase (JNK) is increased in response
A compactly generated pseudogroup which is not realizable
Gael Meigniez
Mathematics , 2009,
Abstract: We exhibit a pseudogroup of smooth local transformations of the real line which is compactly generated, but not realizable as the holonomy pseudogroup of a foliation of codimension 1 on a compact manifold. The proof relies on a description of all foliations with the same dynamic as the Reeb component.
Regularization and minimization of Haefliger structures of codimension one
Gael Meigniez
Mathematics , 2009,
Abstract: We prove the existence of a minimal (all leaves dense) foliation of codimension one, on every closed manifold of dimension at least 4 whose Euler characteristic is null, in every homotopy class of hyperplanes distributions, in every homotopy class of Haefliger structures, in every differentiability class, under the obvious embedding assumption. The proof uses only elementary means, and reproves Thurston's existence theorem in all dimensions. A parametric version is also established.
Haefliger's codimension-one singular foliations, open books and twisted open books in dimension 3
Francois Laudenbach,Gael Gael Meigniez
Mathematics , 2011,
Abstract: We consider singular foliations of codimension one on 3-manifolds, in the sense defined by A. Haefliger as being Gamma_1-structures. We prove that under the obvious linear embedding condition, they are Gamma_1-homotopic to a regular foliation carried by an open book or a twisted open book. The latter concept is introduced for this aim. Our result holds true in every regularity C^r, r at least 1. In particular, in dimension 3, this gives a very simple proof of Thurston's 1976 regularization theorem without using Mather's homology equivalence.
Tapered-amplified AR-coated laser diodes for Potassium and Rubidium atomic-physics experiments
Robert A. Nyman,Gael Varoquaux,Brice Villier,Delphine Sacchet,Frédéric Moron,Yann Le Coq,Alain Aspect,Philippe Bouyer
Physics , 2005, DOI: 10.1063/1.2186809
Abstract: We present a system of room-temperature extended-cavity grating-diode lasers (ECDL) for production of light in the range 760-790nm. The extension of the tuning range towards the blue is permitted by the weak feedback in the cavity: the diodes are anti-reflection coated, and the grating has just 10% reflectance. The light is then amplified using semiconductor tapered amplifiers to give more than 400mW of power. The outputs are shown to be suitable for atomic physics experiments with potassium (767nm), rubidium (780nm) or both, of particular relevance to doubly-degenerate boson-fermion mixtures.
Can Satellite-derived Chlorophyll Imagery Be Used to Trace Surface Dynamics in Coastal Zone? A Case Study in the Northwestern Mediterranean Sea
Philippe Forget,Gael André
Sensors , 2007, DOI: 10.3390/s7060884
Abstract: A comparison of chlorophyll data from SeaWiFS imagery and modeling results from a 3D hydrodynamical model was performed over the northwestern Mediterranean for the entire year of 2001. The study aims at investigating the information content brought by satellite-derived chlorophyll concentration ([Chl]) maps concerning surface dynamics in coastal zone. The study is mainly focused on the Gulf of Lions (GoL) and its outer region, which are mainly influenced by the Rh?ne River, local winds and the Northern Current (NC) flowing from the East along the continental slope. The physical hydrodynamical model was continuously run and 40 SeaWiFS images, presenting a significant coverage of the studied area, were selected. The comparison between [Chl] and sea surface salinity (SSS) fields on a pixel basis showed no definite correlation trends. Three reasons are given in discussion for that result. However, the comparison emphasized areas close to the coasts which were under the influence of different inputs not considered in the model and also of upwellings. A qualitative analysis of the data performed out of these regions exhibited significant similarities between [Chl] and SSS features. The signature of the Rh?ne ROFI (Region of Fresh Water Influence) and, in some cases, of the NC, was evidenced on [Chl] maps. We found that the intensity of this signature is seasonally modulated, e.g., it is low in open sea during the summer, oligotrophic, season. In addition, the signature of the Rh?ne ROFI in the western part of the GoL can be only partial due to local chlorophyll deficits. We conclude that, for the regional case studied, chlorophyll imagery can be used as a tracer of surface dynamics through surface salinity but with limitations, especially near the coasts.
Foreword: Pathogens and immune responses of fish and reptiles
Gael Kurath, Alexandra Adams
Veterinary Research , 2011, DOI: 10.1186/1297-9716-42-101
Abstract: The virology papers in this special issue were inspired by keynote presentations at the 8th International Symposium on Viruses of Lower Vertebrates, held in Santiago de Compostela, Spain, in April of 2010. Together with the contributions on bacterial diseases, our intent is to present some of the most interesting and significant aspects of current research in fish and reptile disease and immunity. The co-editors appreciate the interest of Veterinary Research in presenting this special issue to the general veterinary scientific community, and gratefully acknowledge all the efforts of the authors whose work is presented here.Sincerely,Gael Kurath (USGS, Seattle, United States)andAlexandra Adams (University of Stirling, Scotland)
Macroscopic Studies on the Properties of the Anodic Oxide Films on Titanium
GAEL-Mahdy,

材料科学技术学报 , 1998,
Abstract: The effect of fluoride ions on the formation and dissolution behaviour of anodic oxide films on Ti has been investigated in acidic fluoride media (pH=1) using impedance and galvanostatic techniques. A5 the fluoride ion concentration and temperature increase the rate of oxide film formation decreases while the dissolution process increases. oxide film formed at high tem-perature and formation voltage was found to contain more defect sites in the film than that formed at a lower one. Activation energies are calculated during the oxide film formation and dissolution and found to be 20.76 and 28.72 kJ/mol, respectively. Formation rate and reciprocal capacitance data are reported as a function of polarizing current density. Values are recorded for the electrolytic parameters A and B. Potentiostatic curves are derived from the galvanostatic results.
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