Upstream open loop control of the recirculation area downstream of a backward-facing step

The flow downstream a backward-facing step is controlled using a pulsed jet placed upstream of the step edge. Experimental velocity fields are computed and used to the recirculation area quantify. The effects of jet amplitude, frequency and duty cycle on this recirculation area are investigated for two Reynolds numbers (Re=2070 and Re=2900). The results of this experimental study demonstrate that upstream actuation can be as efficient as actuation at the step edge when exciting the shear layer at its natural frequency. Moreover it is shown that it is possible to minimize both jet amplitude and duty cycle and still achieve optimal efficiency. With minimal amplitude and a duty-cycle as low as 10\% the recirculation area is nearly canceled

Bourneville-Sainte-Croix – Zone d’activités de Bourneville

Le diagnostic mené à Bourneville, à proximité de l’autoroute A13, couvre une surface de 14,8 ha, et a été motivé par le projet de création d’une Zac par la communauté de commune Roumois-Seine. Les sondages ont permis la détection de 628 structures et objets isolés erratiques prélevés lors du décapage. Ces résultats se répartissent sur l’ensemble de l’emprise, montrant de faibles zones vides et des concentrations notables dans les tiers nord et sud du terrain sondé. Sur ces secteurs, particuli..

Gaillon – Les Carrières de Gaillon, parcelle AT 22p

Le diagnostic réalisé s’inscrit dans la deuxième phase d’extension des carrières de Gaillon, sur la parcelle AT 22p. La découverte d’une densité importante d’éléments lithiques et céramiques potentiellement en place, témoigne d’une occupation du secteur au Néolithique final. S’il demeure en l’état difficile de la caractériser davantage, la présence de structures (foyers) et la concentration de vestiges mobiliers, confortent à la fois l’hypothèse d’une occupation structurée et celle de niveaux..

Romilly-sur-Andelle – Rue de la Planquette

Le diagnostic effectué rue de La Planquette fournit un état des lieux de la division des parcelles héritée de la planification médiévale. Les axes directeurs constituant sa trame sont préservés, malgré les remaniements et agrégations des fossés. D’après le peu de mobilier collecté, cette trame parcellaire semble active à la charnière du second Moyen Âge jusqu’au début de l’époque moderne. Seul un fossé a fourni des éléments attribuables au xixe s. Les structures observées forment un ensemble ..

The social space of Muslim spokespersons in India: a typology

Who speaks for Muslims in India? Who are the leaders of the so-called “Muslim organizations”? What family and educational background do they come from? What is their relation to state authorities? This article addresses these questions by presenting a unique biographical database and the results of statistical treatments (multiple correspondence analysis and hierarchical clustering on principal components) of this data. This database includes the office-bearers of a selected set of organizations that make representative claims in the name of Muslims in India. Our analysis thus delineates the contours of the social space of Muslim spokespersons in India and describes how it is structured. We will highlight the important distinctions that exist among these Muslim spokespersons, such as the opposition between secular figures and religious scholars, the political sphere and the educational sphere, and between central power and regional dynamics. This analysis allows us, more broadly, to examine the role of state authorities in the definition of the Muslim spokespersons, thus highlighting some of the characteristic features of state secularism in India

Fast and User-friendly Quantum Key Distribution

Some guidelines for the comparison of different quantum key distribution experiments are proposed. An improved 'plug & play' interferometric system allowing fast key exchange is then introduced. Self-alignment and compensation of birefringence remain. Original electronics implementing the BB84 protocol and allowing user-friendly operation is presented. Key creation with 0.1 photon per pulse at a rate of 486 Hz with a 5.4% QBER - corresponding to a net rate of 210Hz - over a 23 Km installed cable was performed.Comment: 21 pages, 6 figures, added referenc