Wingtip vortex in a NACA0012 airfoil and its active control

Contribución mediante sesión pósterWe conduct experiments in a towing-tank to analyse the flow patterns of wingtip vortices in a NACA 0012 airfoil. In this experimental research, we provide PIV measurements and flow visualisations. Without active control, several parameters are given experimentally as function of the Reynolds number, so we compare these data with the theoretical models of Batchelor, and Moore and Saffman together with DNS. Secondly, we analyse the effect of a continuous injection in the spanwise direction. The continuous jet has a strong influence on the wing-tip vortex formation. We explore this effect at low chord based Reynolds number ranging from 7000 up to 20000. We change the aspect ratio of the injection, R, defined as the ratio of the velocities between the jet (Uj) and free-stream (U). For R=1, we find that the jet strongly affects the wingtip vortex formation with a sudden decrement of the axial vorticity and the azimuthal velocity. This technique is a challenge and a promising tool to reduce the intensity of the vortex core.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

\u3cem\u3eBaptiste v. de Volunbrun 5 H. & J. 86 (Md 1820)\u3c/em\u3e: the Events Surrounding an Early Nineteenth-Century Freedom Petition Before the Maryland Court of Appeals

BAPTISTE V. DE VOLUNBRUN 5 H. & J. 86 (Md. 1820): In Jean Baptiste’s 1820 freedom petition we have not only a slavery case typical of the region and period, but also a compelling and informative narrative from the beginning of the end of North America’s nearly two hundred and fifty year era of slavery. This epic has its roots in the some of the earliest African arrivals to the new world and was significantly influenced by the major trends in philosophy that immediately preceded its commencement, as well as a concurrent and burgeoning American abolitionist movement. It features questionable heroes and underhanded villains, mob riots and narrow escapes, suffering and injustice, journeys through the Caribbean, New England, Maryland and New Orleans, and ultimately, redemption

Burger, Marcel, Jérôme Jacquin & Raphaël Micheli (éds). 2011. La parole politique en confrontation dans les médias (Bruxelles : de Boeck, coll. Culture & Communication)

Les contributions qui constituent cet ouvrage proviennent de champs divers s’apparentant aux sciences du langage ainsi qu’à celles de la communication. Ces points de vue variés portant tous sur le politique, la confrontation et les médias enrichissent la recherche en la situant au croisement d’une « interdisciplinarité focalisée ». Les auteurs de l’introduction (M. Burger, J. Jacquin, R. Micheli) présentent la substance du questionnement : c’est sur la confrontation inhérente au discours poli..

Plenoptic microscope based on laser optical feedback imaging (LOFI)

We present an overview of the performances of a plenoptic microscope which combines the high sensitivity of a laser optical feedback imaging setup , the high resolution of optical synthetic aperture and a shot noise limited signal to noise ratio by using acoustic photon tagging. By using an adapted phase filtering, this microscope allows phase drift correction and numerical aberration compensation (defocusing, coma, astigmatism ...). This new kind of microscope seems to be well adapted to make deep imaging through scattering and heterogeneous media

A reduced domain pool based on DCT for a fast fractal image encoding

Fractal image compression is time consuming due to the search of the matching between range and domain blocks. In order to improve this compression method, we propose firstly, in this paper, a fast method for reducing the computational complexity of fractal encoding by reducing the size of the domain pool. This reduction is based on the lowest horizontal and vertical DCT coefficients of domain blocks. The experimental results on the test images show that the proposed method reduce the time computation and reach a high speedup factor without decreasing the image quality. Secondly, we combine our method to the AP2D approach which uses two domain pools in two steps of encoding. A more reduction of encoding time is obtained without decreasing the image quality