Rigorous Enclosures of Solutions of Neumann Boundary Value Problems

This paper is dedicated to the problem of isolating and validating zeros of non-linear two point boundary value problems. We present a method for such purpose based on the Newton-Kantorovich Theorem to rigorously enclose isolated zeros of two point boundary value problem with Neumann boundary conditions.Comment: 21 pages and 2 figure

Massive spinning particles and the geometry of null curves

We study the simplest geometrical particle model associated with null paths in four-dimensional Minkowski space-time. The action is given by the pseudo-arclength of the particle worldline. We show that the reduced classical phase space of this system coincides with that of a massive spinning particle of spin $s=\alpha^2/M$, where $M$ is the particle mass, and $\alpha$ is the coupling constant in front of the action. Consistency of the associated quantum theory requires the spin $s$ to be an integer or half integer number, thus implying a quantization condition on the physical mass $M$ of the particle. Then, standard quantization techniques show that the corresponding Hilbert spaces are solution spaces of the standard relativistic massive wave equations. Therefore this geometrical particle model provides us with an unified description of Dirac fermions ($s=1/2$) and massive higher spin fields.Comment: 11 pages, LaTeX (elsart macros

Diffeomorphisms from higher dimensional W-algebras

Classical W-algebras in higher dimensions have been recently constructed. In this letter we show that there is a finitely generated subalgebra which is isomorphic to the algebra of local diffeomorphisms in D dimensions. Moreover, there is a tower of infinitely many fields transforming under this subalgebra as symmetric tensorial one-densities. We also unravel a structure isomorphic to the Schouten symmetric bracket, providing a natural generalization of w_\infty in higher dimensions.Comment: 10 page

Understanding the Institutional Evolution of the European Rural Policy: A Methodological Approach

Last decades have seen the development of a new rural policy. Different problems occurring in rural areas have pushed the EU Commission to draft policy instruments aiming to address them. However this rural policy path has not always been explicit neither has followed a continuous trend but rather has seen a series of forward and backward steps. Given the lack of a method to establish the relevance and the level of political acceptance of EU rural policy, a methodology has been developed. This methodology has tried to identify the EU political procedure trend, though this is not a formal sequence, and to establish a classification of different events according to a proposed hierarchy. Several EU documents, decisions, directives and financial resource allocations have been analysed. Within the review performed, each rural policy milestone has been classified following the proposed hierarchical chart. This has enabled the drawing of the different backs and forwards taken by this process. Besides, it has lead to the interpretation of the rural policy instruments current position in relation with other European policy instruments.Rural development, policy analysis, institutional processes, Agricultural and Food Policy,

El producto de diseño industrial como soporte de la comunicación

1 archivo PDF (15 páginas) : incluye ilustraciones"...El signo como índice (ver figuras 2 y 3), ejerce la función de indicar, de dar a entender algo con señales, de advertir la existencia de algo y en última instancia de permitir la distinción de una cosa entre las demás; trabajado correctamente en un diseño, al usuario le comunica la función, el modo de empleo, la accesibilidad, los aspectos de seguridad y la direccionalidad, entre muchas otras características de un mensaje, un espacio o de un objeto de diseño. ...

Renovarse o morir : nuevos escenarios para la supervivencia de las productoras audiovisuales en Andalucía

Las productoras audiovisuales en Andalucía atraviesan un difícil momento para su supervivencia condicionadas por la profunda crisis económica que atraviesa España. El descenso generalizado de los ingresos publicitarios en las televisiones, la reducción de los fondos públicos destinados a la Radio Televisión de Andalucía, RTVA, la atomización del sector o la falta de un tejido empresarial autóctono que demande el servicio de estas productoras, algunas de las claves que definen la situación actual de marcha de este sector.The audiovisual companies in Andalusia are living a difficult time for their survival conditioned by the deep economic crisis in Spain. The widespread decrease of the advertising income in televisions, the reduction of public funds destined to Andalusian Radio-Television, RTVA, the sector´s fragmentation or the lack of a native business sector that requires the service of these companies, some of the keys that define the current state of progress of this sector