Search results for "Natation"
showing 8 items of 8 documents
Teaching swimming at primary school level : a significant difficulty for the subject
2020
This thesis seeks to identify and understand, from the epistemological and methodological field of psychoanalysis, the nature of the difficulty in teaching swimming encountered by four P.E. primary school teachers. It is based on a trainer’s observation witnessing the embarrassment of P.E. teachers confronted with this discipline and with a lack of ‘solutions’ to deal successfully with this professional difficulty. The clinical methodological device consists in the construction of four cases based on the interpretative analysis of the subject’s speech, collected through individual clinical interviews. This collection is completed by a clinical observation time during teaching sessions for t…
Analyse des interactions entre des nageurs de haut niveau et un instrument de mesure subaquatique
2008
International audience; L’objectif est d’analyser, du point de vue des acteurs, les interactions entre des nageurs de haut niveau et un instrument d’évaluation : le Mad-System. Ce dispositif a été développé pour mesurer les résistances à l’avancement (Hollander, de Groot, van Ingen Schenau, Toussaint, de Best, & Peeters, 1986). L’étude vise à décrire le couplage entre les nageurs et ce dispositif technique (Mad-System) lors d’un protocole de recherche. Il s’agit d’analyser (a) l’activité réelle des acteurs lors de l’utilisation du Mad-system, et (b) la qualité de l’interaction entre les nageurs et le Mad-System. Les résultats de cette analyse servent ensuite de base à une réflexion sur la c…
Weathering of gasification and grate bottom ash in anaerobic conditions
2009
Abstract The effect of anaerobic conditions on weathering of gasification and grate bottom ash were studied in laboratory lysimeters. The two parallel lysimeters containing the same ash were run in anaerobic conditions for 322 days, after which one was aerated for 132 days. The lysimeters were watered throughout the study and the quality of leachates and changes in the binding of elements into ash were observed. The results show that organic carbon content and initial moisture of ashes are the key parameters affecting the weathering of ashes. In the grate ash the biodegradation of organic carbon produced enough CO 2 to regulate pH. In contrast the dry gasification ash, containing little org…
Aqueous Solubility Diagrams for Cementitious Waste Stabilization Systems. 4. A Carbonation Model for Zn-Doped Calcium Silicate Hydrate by Gibbs Energ…
2002
A thermodynamic Gibbs energy minimization (GEM) solid solution-aqueous solution (SSAS) equilibrium model was used to determine the solubility of Zn from calcium silicate hydrate (CSH) phases doped with 0, 0.1, 1, 5, and 10% Zn at a unity (Ca+Zn)/Si molar ratio. Both the stoichiometry and standard molar Gibbs energy (G(o)298) of the Zn-bearing end-member in the ideal ternary Zn-bearing calcium silicate hydrate (CZSH) solid solution were determined by a "dual-thermodynamic" (GEM-DT) estimation technique. The SSAS model reproduces a complex sequence of reactions suggested to occur in a long-term weathering scenario of cementitious waste forms at subsurface repository conditions. The GEM model …
Halloysite Nanotubes: Controlled Access and Release by Smart Gates
2017
© 2017 by the authors. Licensee MDPI, Basel, Switzerland. Hollow halloysite nanotubes have been used as nanocontainers for loading and for the triggered release of calcium hydroxide for paper preservation. A strategy for placing end-stoppers into the tubular nanocontainer is proposed and the sustained release from the cavity is reported. The incorporation of Ca(OH) 2 into the nanotube lumen, as demonstrated using transmission electron microscopy (TEM) imaging and Energy Dispersive X-ray (EDX) mapping, retards the carbonatation, delaying the reaction with CO 2 gas. This effect can be further controlled by placing the end-stoppers. The obtained material is tested for paper deacidification. We…
« En difficulté » : lieu-dit de la complexité à enseigner la natation pour des professeurs des écoles
2021
International audience
Swimrun: An emerging new endurance sport
2018
International audience; The swimrun is a new endurance team-sport based on two persons swimming and running alternatively through open water and mostly trails. The aim of this study was to analyse participation and performance trends for males, females and mixed duo team at the ÖTILLÖ Swimrun race (10 km open-water swimming and 65 km trail running). During the 2012–2016 period, the mean total time performance of the best athletes at the ÖTILLÖ Swimrun decreased significantly by 17 min/year for males, 40 min/year for mixed and 59 min/year for females duo, respectively. The difference in performance between the best males and females duo (26 ± 15%) was significantly greater compared to the di…
Relative age effect among French swimmers
2022
L'objectif de cette étude était de révéler la présence de l'effet de l'âge relatif parmi les nageurs Français et de proposer une méthode de rééquilibrage afin de mieux apprécier le potentiel de l'athlète en fonction de sa catégorie et de sa discipline. 62 610 nageurs entre 10 et 16 ans sur la discipline du 100m nage libre en bassin de 50m sont considérés pour cette étude. Parmi eux, moins d'un nageur sur cinq entre 13 et 16 ans est né dans le dernier trimestre de l'année. Pour éviter l'abandon ou la perte de vue des nageurs, nous avons mis en place une méthode de rééquilibrage basée sur la performance du nageur, son âge exact au moment de la compétition et le coefficient de régression entre…