On rank 2 vector bundles on Fano manifolds

In this work we deal with vector bundles of rank two on a Fano manifold $X$ with $b_2=b_4=1$. We study the nef and pseudoeffective cones of the corresponding projectivizations and how these cones are related to the decomposability of the vector bundle. As consequences, we obtain the complete list of $\mathbb{P}^1$-bundles over $X$ that have a second $\mathbb{P}^1$-bundle structure, classify all the uniform rank two vector bundles on this class of Fano manifolds and show the stability of indecomposable Fano bundles (with one exception on $\mathbb{P}^2$).Comment: Updated version with an issue correcte

Nestings of rational homogeneous varieties

In this paper we study the existence of sections of universal bundles on rational homogeneous varieties -- called nestings -- classifying them completely in the case in which the Lie algebra of the automorphism group of the variety is simple of classical type. In particular we show that, under this hypothesis, nestings do not exist unless there exists a proper algebraic subgroup of the automorphism group acting transitively on the base variety.Comment: Major revision of the exposition. To appear in Tranformation Group

Tangential projections and secant defective varieties

Going one step further in Zak's classification of Scorza varieties with secant defect equal to one, we characterize the Veronese embedding of $\P^n$ given by the complete linear system of quadrics and its smooth projections from a point as the only smooth irreducible complex and non-degenerate projective subvarieties of $\P^N$ that can be projected isomorphically into $\P^{2n}$ when $N\geq\binom{n+2}{2}-2$.Comment: To appear in Bulletin of the London Mathematical Societ

Towards the development of the supply chain of concentrated solar power

This work focuses on the investigation into the planning of renewable energy power plants in Brazil using the Concentrated Solar Power (CSP) technology. The main aim of the paper is to present an analysis of the planning process that can be used as a basis of the development of a method to assess the Brazilian’s local manufacturing and supply chain capabilities in supporting the deployment of the CSP technology. The paper identifies areas in which the concerted efforts should be emphasized. For this, the paper will first discuss the key components of the chosen CSP technology (in this case the parabolic through). The manufacturing processes of these components will subsequently be analyzed and the key enabling technologies will be determined. The demands of electricity will be estimated using the System Advisory Model®, a modelling tool developed by the National Renewable Energy Laboratory (NREL). An assessment method will finally be proposed to identify the potentials of the local Brazilian supply chain, through the readiness evaluation of the key enabling technologies and manufacturing processes

Comprensión lectora en niños de lento aprendizaje en la escuela primaria "Vasco de Quiroga" turno vespertino.

Se aplican diversas estrategias a niños de primaria con problemas de comprencion lectora, en los primero capitulos se sustenta con teoria

Rank two Fano bundles on G(1,4)

We classify rank two Fano bundles over the Grassmannian of lines \G(1,4). In particular we show that the only non-split rank two Fano bundle over \G(1,4) is, up to a twist, the universal quotient bundle \cQ. This completes the classification of rank two Fano bundles over Grassmannians of lines

Las consecuencias de las nuevas características del trabajo en la afiliación sindical

El presente estudio pretende analizar cómo inciden las nuevas características del trabajo en la afiliación sindical de los asalariados en España. Para llevarlo a cabo, se realiza primero un acercamiento a la literatura referida a los cambios en el mundo del trabajo. En segundo lugar, se hace un breve repaso de los determinantes clásicos de la afiliación sindical, para después analizar cuál es el peso de dichos determinantes en la actualidad. Finalmente, se expondrán las consecuencias que tienen las nuevas características del trabajo en las variables que determinan con más claridad los niveles de afiliación sindical