Search results for "dynamique"
showing 10 items of 187 documents
Famille et démocratie : la dynamique égalitaire des rapports intrafamiliaux selon Tocqueville et son actualité
2015
International audience
A. Bavelas, 1950, Communication Patterns in Task-Oriented Groups. Version bilingue et commentée
2021
Ce document du groupe fmr présente une version bilingue et commentée de l'article d'Alex Bavelas, Communication Patterns in Task-Oriented Groups, paru en 1950 dans la revue Journal of the Acoustical Society of America. S'appuyant sur les seuls travaux de Kurt Lewin et de ses élèves, et donc ne mobilisant ni la sociométrie ni la théorie des graphes au sens strict, l'auteur propose un ensemble de mesures permettant de mesurer l'efficacité de la communication au sein d'une structure donnée. Cet article a eu une influence importante dans différents champs de recherche (analyse de réseaux sociaux, management, psychologie, etc.).
Recent developments in the acoustical properties of perforated and porous materials containing dead-end pores
2017
It was shown recently in Nevers, France, Sherbrooke, Canada and Salford, UK, that porous materials with semi-opened pores or materials with open pores bearing lateral cavities or resonators at the microscopic scale of the pores can result in peculiar sound absorption properties. Various examples of these materials can be found in engineering and in everyday life including bio-based materials. The cavities and resonators can be assimilated to dead-end pores, which are opened at one end and closed at the other. The dead-end pores are known to geophysicists. We studied them more recently in the field of engineering acoustics where the saturating fluid is air. The closed ends prevent the fluid …
Expansion dynamics of the plasma plume formed by the impact of a nanosecond Nd : YAG laser beam on metallic surface under atmospheric conditions : ex…
2010
Laser ablation in the air at atmospheric pressure is nowadays frequently applied in industry, chemical analysis, surgery… For a further development of laser ablation based technologies, it is necessary to better understand the laser – matter interaction. During the impact of a laser pulse on the surface of the treated material, a plasma plume forms above the target surface. This plume contains particles (electrons, ions, atoms) of ablated matter, as well as of ambient gas, if present. During the laser pulse, this plume absorbs a large amount of the laser beam energy, thus reducing the quantity of the laser radiation arriving to the target surface. Dimensions, as well as parameters of this p…
Study of control command of dynamic platform for driving simulation and influence on simulator sickness
2013
Simulation has been intensively involved nowadays in research and development for automotive industry. Driving simulators are one of those simulation techniques which are used to evaluate the prototypes for the vehicle dynamics and driving assistance systems. However with the driving simulator, there is a lock associated with its use. Because representing a permanent scenario as scale 1 is quite difficult. Because of that difficulty, motion/simulator sickness is an inevitably important topic to study.This thesis proposes to explore methods and tools to implement in static or dynamic simulators. In this implementation, studies of simulator sickness are conducted with objective measures (via …
Etude expérimentale et modélisation thermodynamique du système CaO-SiO2-(Al2O3)-H2O
2012
The aim of this work is to build a thermodynamic model at 25°C to describe the main hydrates of ordinary Portland cement with or without supplementary cementitious materials (SCM) : calcium hydrosilicates. With high aluminium content, SCM in blended cements modify the nature and the composition of the hydrates of cement paste.The simplified model system CaO-SiO2-H2O was studied by synthesising of C-S-H with identical protocol and analysis. We distinguished, hydration solutions undersaturated and supersaturated from Portlandite.This last system has been extended to CaO-Al2O3-SiO2-H2O system. Then, we determined the most suitable protocol to synthesize pure C-A-S-H.The nanoparticular nature a…
Nonlinear resonances and some of their applications to information processing
2021
The study of resonance phenomena in nonlinear dynamical systems has drawn considerable attention for years. The most studied nonlinear resonance is undoubtedly the famous stochastic resonance, which consists of perturbing a nonlinear system with an appropriate amount of noise to enhance the detection of a subthreshold input signal. Since the introduction of stochastic resonance in the context of climate dynamics, it was later observed that a deterministic high frequency perturbation can replace noise leading to vibrational resonance. Even if this latter resonance was investigated in many areas of science for more than two decades now, it is still receiving attentions. It is the subject of t…
Utilisation de la Dominance temporelle des sensations pour la caractérisation sensorielle des produits de la filière blé-farine-pain
2012
Eurogerm is specialized in flour correctors, bread improvers and technological ingredients for the wheat, flour and bread sector. The company gives great importance to sensory analysis as a diagnostic tool of finished products and has four expert panels; each panel is specialized in one category of products and is trained to standard sensory profiling. Today, in addition to the traditional method, Eurogerm wants to explore new methods in order to offer new services to its customers. This paper describes the development of Temporal Dominance of Sensations (TDS) created in the “Centre des Sciences du Goût et de l’Alimentation” (CSGA) (PINEAU et al., 2009). TDS provides information on the perc…
Modèle d'analyse locorégional des systèmes énergétiques
2005
National audience; RÉSUMÉ : le défi majeur qui se pose aujourd'hui à tout acteur du système énergétique est de rendre compte des rapports, à la fois contradictoires et simultanés, entre mondialisation et décentralisation, d'une part, et entre développement socioéconomique et développement durable, d'autre part. Ce défis doit être abordé par une approche globale, seule capable d'appréhender toute la complexité du problème, induite par les interactions des facteurs socio-économiques, politiques, technologiques et environnementaux. Cette approche doit être menée en replaçant le système énergétique dans un cadre territorial permettant de saisir les logiques et les implications spatiales des dif…
Radio source structure in astrometric and geodynamics very long baseline interferometry
1989
Radio source structure in astrometric and geodynamics very long baseline interferometry