Ressenyes

Obra ressenyada: Antonio LUCAS MARÍN, La nueva sociedad de la información. Una perspectiva desde Silicon Valley. Madrid: Trotta, 2000

Numerical study of delta wing leading edge blowing

Spanwise and tangential leading edge blowing as a means of controlling the position and strength of the leading edge vortices are studied by numerical solution of the three-dimensional Navier-Stokes equations. The leading edge jet is simulated by defining a permeable boundary, corresponding to the jet slot, where suitable boundary conditions are implemented. Numerical results are shown to compare favorably with experimental measurements. It is found that the use of spanwise leading edge blowing at moderate angle of attack magnifies the size and strength of the leading edge vortices, and moves the vortex cores outboard and upward. The increase in lift primarily comes from the greater nonlinear vortex lift. However, spanwise blowing causes earlier vortex breakdown, thus decreasing the stall angle. The effects of tangential blowing at low to moderate angles of attack tend to reduce the pressure peaks associated with leading edge vortices and to increase the suction peak around the leading edge, so that the integrated value of the surface pressure remains about the same. Tangential leading edge blowing in post-stall conditions is shown to re-establish vortical flow and delay vortex bursting, thus increasing C sub L sub max and stall angle

Las empresas en la prensa mediante los "pseudoeventos"

Esta tesis pone en evidencia la presencia de la actividad de relaciones públicas a las noticias de la prensa que se lee en Cataluña a través de la identificación de los eventos creados por las empresas para ganar cobertura en los medios de comunicación. Estos eventos, que forman parte de las prácticas de publicity, se describen por varios autores como pseudoesdeveniments y en la investigación se identifican como generadores del 21.8% de las noticias donde una empresa es el sujeto principal.This thesis shows the presence of public relations activity in the press news in Catalonia through the identification of events created by companies to gain media coverage. These events, which are part of the publicity practices, are described by several authors as pseudoevents, and research identified them as generators of 21.8% of the news in which a company is the main subject. This thesis has won the Prat Gaballí award from the Col·legi de Publicitaris i Relacions Públiques de Catalunya. More info: http://www.colpublirp.com