2,990 research outputs found
Axisymmetric form of Kármán-Howarth equation and its limiting forms
No full textInternational audienceKinematics and dynamics of homogeneous axisymmetric turbulence have been derived with the assumption that the properties of the turbulence are invariant with respect to rotation about a preferred direction λ. In particular, the "axisymmetric" equivalent of Karman-Howarth "isotropic" equation is derived using Lindborg's representation of the two-point correlation tensors of homogeneous axisymmetric turbulence. When the more constraining assumption of isotropy is made, this equation reduces to the well-known Karman-Howarth equation. There are two interesting limiting forms of the axisymmetric Karman-Howarth equation: the axisymmetric form of the energy balance equation and the axisymmetric form of the vorticity balance equation
The axisymmetric equivalent of Kolmogorov's equation
No full textInternational audienceA type of turbulence which is next to local isotropy in order of simplicity, but which corresponds more closely to turbulent flows encountered in practice, is locally axisymmetric turbulence. A representation of the second and third order structure function tensors of homogeneous axisymmetric turbulence is given. The dynamic equation relating the second and third order scalar structure functions is derived. When axisymmetry turns into isotropy, this equation is reduced to the well-known isotropic result: Kolmogorov's equation. The corresponding limiting form is also reduced to the well-known isotropic limiting form of Kolmogorov's equation. The new axisymmetric and theoretical results may have important consequences on several current ideas on the fine structure of turbulence, such as ideas developed by analysis based on the isotropic dissipation rate ∈iso or such as extended self similarity (ESS) and the scaling laws for the n-order structure functions
M. Bonnin, A. Ould Zein, B. Queffelec, M. Le Tixerant, Droit de l’environnement marin et côtier en Mauritanie, 2014
No full textEmmanouilidou Pantelina. M. Bonnin, A. Ould Zein, B. Queffelec, M. Le Tixerant, Droit de l’environnement marin et côtier en Mauritanie, 2014. In: Revue Juridique de l'Environnement, n°3, 2015. pp. 579-580
Proceedings of the 1st ACM Workshop on Performance Evaluation of Wireless, Ad-hoc, Sensor, and Actuator Networks
No full textArticles for the first PE-WASUN workshop
PE-WASUN'04 - Proceedings of the First ACM International Workshop on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks: Foreword
No full textA Collaborative Environment for Knowledge Sharing Governed by ABAC Policies
No full textH. Ould-Slimane, M. Bande, H. Boucheneb, WiseShare, ?A Collaborative Environment for Knowledge Sharing Governed by ABAC Policies?, 8th IEEE International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom), October 2012
Céréales et Pseudo-Céréales de cueillette du Sahara Central (Ahaggar)
No full textGast M., Gaudin-Harding F., Ould-Aoudia M. Céréales et Pseudo-Céréales de cueillette du Sahara Central (Ahaggar). In: Journal d'agriculture tropicale et de botanique appliquée, vol. 19, n°1-3, Janvier-février-mars 1972. pp. 50-58
Hammerstein Modelling of Electrical Drives by the Auto-Tuning Method
No full textAccurate modelling of electrical drives for on-line testing is a relevant problem, because of their inherent nonlinear behaviour. Efficient modelling for simulation, performance evaluation and testing must consider accurate as well as simple models. Auto-tune method is proposed to identify equivalent Hammerstein models. The effectiveness of the presented procedure is verified by experimental tests, showing that Hammerstein models overcome the limitations inherent to signal linearization procedures
Analytical modelling of hot-spot traffic in deterministically-routed k-ary n-cubes
No full textMany research studies have proposed analytical models to evaluate the performance of k-ary n-cubes with deterministic wormhole routing. Such models however have so far been confined to uniform traffic distributions. There has been hardly any model proposed that deal with non-uniform traffic distributions that could arise due to, for instance, the presence of hot-spots in the network. This paper proposes the first analytical model to predict message latency in k-ary n-cubes with deterministic routing in the presence of hot-spots. The validity of the model is demonstrated by comparing analytical results with those obtained through extensive simulation experiments
Contestations monétaires. Une économie politique de la monnaie
No full textLe dossier qui compose le cœur de ce numéro 18 constitue une nouvelle contribution à une économie politique qui s’ancre dans des terrains, des réalités, des objets et des méthodes variés, bien au-delà des approches en termes de régulation. En rassemblant des contributions sur les différentes formes, modalités et pratiques de Contestations monétaires, le dossier contribue à une économie politique de la monnaie qui est déjà solidement construite, comme le rappellent Pepita Ould-Ahmed et Jean-François Ponsot, coordonnateurs du dossier, dans leur introduction... Lire la suit
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