Search results for "Verre"
showing 10 items of 49 documents
Fibres optiques à coeur supendu en verre d'oxyde de tellure et génération d'effets non linéaires dans l'infrarouge au-delà de 2 microns
2012
The work reported in this thesis deals with the fabrication of suspended core tellurite microstructured optical fibers (MOFs) for supercontinuum generation beyond 2 µm. In order to reach our aim, we first studied thermal and optical properties of TeO2-ZnO-R2O and TeO2-WO3-R2O (where R = Li, Na and K) glasses. The glass 80TeO2-10ZnO-10Na2O (molar %) has been chosen in order to make MOFs for characterization of the generated non linear optical effects. Synthesis performed under dry and oxidative atmosphere allowed us to reduce the hydroxyl groups concentration by a factor of 30 compared to fabrication in air atmosphere. Use of dehydrating agents (ZnF2 and TeCl4) allowed to reduce again the OH…
Tellurites fibers for infrared supercontinuum sources : opto-geometric profiles and extrinsic absorptions management
2016
This PhD thesis work focuses on the synthesis and purification of vitreous materials used for the development of waveguides with varied profiles, dedicated to supercontinuum (SC) generation between 1 and 5 μm.Concerning the purification of tellurite glasses, several leads were followed, but best results are obtained for the purification of the TeO2-ZnO-Na2O glassy system by the means of zinc fluoride. Attenuation measurements performed on several meter-long single-index fiber samples reveal the nearly complete elimination of water-related absorptions between 3 and 4 μm (OH ions concentration lower than 1 ppm mass.). Such water-purified glasses were firstly dedicated to microstructured optic…
Lesquin (Nord), ZAC du Mélantois, Au Chemin Perdu : la nécropole mérovingienne du hameau de Merchin (zone 2) (fin Ve siècle-début VIIIe siècle) : rap…
2015
La construction d'un complexe d'entreprises au hameau de Merchin, au sein d'une zone sensible de découvertes archéologiques, a motivé plusieurs prescriptions de fouille qui se sont déroulées entre l'été 2008 et l'été 2009. Elles ont porté sur un ensemble de structures néolithiques, sur un complexe à vocation agro-pastoral protohistorique/antique, et, enfin, sur une nécropole du premier Moyen Âge. Inscrite dans un terroir occupé de manière plus ou moins continue depuis le Hallstatt jusqu'au bas Moyen Âge, la nécropole mérovingienne de Lesquin est localisée sur la frange orientale du plateau du Mélantois. Elle supplante une occupation débutée au Hallstatt au travers de l'élément structurant l…
De Bibracte à Augustodunum : permanences et évolutions des activités manufacturières de l’époque gauloise à la fin du Haut-Empire
2007
L’importance de l’artisanat autunois et son développement jusqu’au iiie siècle prennent racine à Bibracte qui a su exploiter les ressources naturelles de son environnement et parfaire un savoir-faire local ayant survécu à la conquête. Les recherches sur ces activités manufacturières menées conjointement à Bibracte et à Autun nous offrent ainsi une opportunité d’étudier ces problématiques sur la durée. À Bibracte, puis à Autun, les artisans du métal sont omniprésents, mais d’autres métiers, aux témoins plus discrets, ont pu aussi êtres identifiés. Dans le cadre de cet article, nous présentons succinctement les lieux de production et un bilan des différents corps de métier. Enfin, nous évoquo…
Frequent blood flow restricted training not to failure and to failure induces similar gains in myonuclei and muscle mass
2021
The purpose of the present study was to compare the effects of short-term high-frequency failure vs non-failure blood flow–restricted resistance exercise (BFRRE) on changes in satellite cells (SCs), myonuclei, muscle size, and strength. Seventeen untrained men performed four sets of BFRRE to failure (Failure) with one leg and not to failure (Non-failure; 30-15-15-15 repetitions) with the other leg using knee-extensions at 20% of one repetition maximum (1RM). Fourteen sessions were distributed over two 5-day blocks, separated by a 10-day rest period. Muscle samples obtained before, at mid-training, and 10-day post-intervention (Post10) were analyzed for muscle fiber area (MFA), myonuclei, an…
Un témoignage de gestes funéraires antiques à Bonneuil-en-France (Val-d’Oise)
2022
Eine Suchschnittprospektion bei Bonneuil-en-France (Val-d’Oise), hat eine stark holzkohlehaltige Schicht zum Vorschein gebracht, die reich an verbrannten oder durch Feuereinwirkung beeinträchtigten archäologischem Fundgut war. Dieses kann in die zweite Hälfte des 1. oder an den Beginn des 2. Jh. n. Chr. datiert werden. Die archäologische Fundstelle, die sich im Talboden am Zusammenfluss von Crould und Morée befindet, gehört zu einer seit der späten Hallstattzeit genutzten Gräberlandschaft. Mehrere Argumente sprechen dafür, dass es sich hier um eine Schüttung von Überresten einer Brandbestattung handelt, bei der durch ein Auslesen der Leichenbrandreste nur wenige menschliche Knochen erhalten…
Les Hommes noirs, Une verrerie dreyfusarde d'Émile Gallé (1899-1900)
2014
International audience
Recovery during and after a simulated multi-day tennis tournament: Combining active recovery, stretching, cold-water immersion, and massage intervent…
2021
The aim of this study was to investigate the effects of a mixed-method recovery intervention (MMR) consisting of active recovery, stretching, cold-water immersion, and massage on physical, technical, physiological, and perceptual recovery during and after a five-day simulated tennis tournament. Nine competitive male tennis players (age, 24.6±4.2 years) with national ranking positions (German Tennis Federation) and Universal Tennis Ratings between approximately 11 to 13 participated in two singles tennis tournaments, which were separated by a three-month washout period. During the tournaments, participants played five two-and-a-half-hour competitive singles tennis match on five consecutive d…
Espaces funéraires et mobiliers en Champagne-Ardenne durant l'Antiquité tardive
2010
International audience; This article attempts to demonstrate the criteria used in the organization of funerary spaces at the end of Antiquity. Amongthose elements that structure the funerary space, the enclosure trench, understood as a delimiting characteristic or a place for the deposit of objects, seems to have been of decreasing importance. The age of the deceased affects the choice of siting of the grave and treatment of the body, while deposits of grave goods seem little linked to the age of the deceased. An exception to this observation is objects of apotropaic value, which are more frequently found in the graves of the young. On the other hand, gender seems to play a role of little i…
Heart Rate Variability Monitoring During Strength and High-Intensity Interval Training Overload Microcycles
2019
Objective: In two independent study arms, we determine the effects of strength training (ST) and high-intensity interval training (HIIT) overload on cardiac autonomic modulation by measuring heart rate (HR) and vagal heart rate variability (HRV). Methods: In the study, 37 well-trained athletes (ST: 7 female, 12 male; HIIT: 9 female, 9 male) were subjected to orthostatic tests (HR and HRV recordings) each day during a 4-day baseline period, a 6-day overload microcycle, and a 4-day recovery period. Discipline-specific performance was assessed before and 1 and 4 days after training. Results: Following ST overload, supine HR, and vagal HRV (Ln RMSSD) were clearly increased and decreased (small …