Study of creep function determination of two amorphous polymers by indentation technique

When considering polymeric materials for the components design, their behaviour under external actions (mechanical, temperature, time, etc.) must be known. Thus, the study of their mechanical properties is essential if these materials are going to use as structural elements. The traditional mechanical tests, as tensile test or dynamic mechanical analysis (DMA), are widely used to determining the mechanical properties of bulk polymers or films. However, when these materials are used as coatings or when the available component volume is limited, the traditional tests are not suitable to determining the mechanical behaviour. Depth sensing indentation test is a technique that allows obtaining the mechanical properties of a component, at surface level, even for very small samples. In this work the possibility of using depth sensing indentation technique to characterize amorphous polymers was explore. The results were compared with those obtained by DMA

El turismo en los espacios rurales y naturales de Castilla y León, como base del desarrollo rural

El objetivo principal de este estudio es el análisis del turismo en el medio rural y natural, como elemento dinamizador de espacios con problemas socioeconómicos importantes. El trabajo se estructura fundamentalmente en tres partes. En la primera se analizan los espacios naturales de especial interés en la región, como producto de atracción para los visitantes. A continuación estudiamos la aplicación de las distintas políticas, autonómicas, nacionales y particularmente las europeas, destinadas a fomentar el desarrollo del turismo rural en sus distintas modalidades, en la comunidad de Castilla y León. Por último, se analizan los elementos definidores de la oferta y demanda turística en el conjunto de la región, así como los problemas a resolver en el futuro.Cette étude a pour objectif principal d’analyser le tourisme dans le milieu rural et naturel, comme élément de dynamisation des espaces ayant des problèmes socio-économiques importants. Le travail est fondamentalement structuré en trois parties. Dans la première, nous analysons les espaces naturels ayant un intérêt spécial dans la région, comme produit attirant pour les visiteurs. Par la suite, nous étudions l’application des différentes politiques autonomes, nationales et particulièrement celles européennes, destinées à encourager le développement du tourisme rural dans ses diverses modalités, dans la communauté de Castille-Léon. Enfin, nous analysons les éléments qui définissent l’offre et la demande touristique dans l’ensemble de la région, ainsi que les problèmes à résoudre dans l’avenir.This study’s main objective is to analyse tourism in rural and natural environments as a revitalising element of spaces with important socio-economic problems. The work was structured basically in three parts. Firstly, the natural spaces of special interest in the region were analysed as a form of attraction for visitors. Subsequently, the application of the various policies were studied, such as autonomous, national and particularly the European policies which are directed towards promotion of the development of rural tourism in its various forms in the Castille and Leon community. Lastly, the elements defined in the offer and tourism demand in the whole of the region, and also the problems which must be solved in the future were analysed

Synthesis of isoquinolines by irradiation of 1-methoxy-2-azabuta-1,3-dienes in a neutral medium

We describe, for the first time, the photocyclization of 2-azadienes in a neutral medium. The reaction leads to the formation of isoquinolines. © 2001 Elsevier Science Ltd. All rights reserved

Sobre la caracterización mineralógica de la bismutita de Oliva de la Frontera (Badajoz): Información

Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEpu

Metanálisis de la obra de Louise Bourgeois a través del dibujo infantil

Sin resume