GeoCommons : geolocalización de la producción académica de la UPC

Peer ReviewedPostprint (author's final draft

Evolución histórica del inventario de molinos hidráulicos de Alcalá de Guadaíra

Comunicación presentada a las II Jornadas Andaluzas de Patrimonio Industrial y de la Obra Pública, celebradas en Cádiz, 25-27 Octubre, 2012Posiblemente sea Alcalá de Guadaíra la primera población andaluza en número de molinos de agua. Entre los siglos XV y XVIII, la antigua Alcalá de los Panaderos llegó a contar con 40 molinos, en el siglo XIX se citan 33 y en la actualidad quedan 24. Nombres como Cerrajas, Pelay orrea, Realajeo Piealegre, Arrabal, Algarrobo, la Tapada, las Eras, San Juan,Benaharosa, Aceña Trapera, San José, Rincón, Hundido o San Pedro son una pequeña muestra de la serie de interesantes artefactos que aún puedan visitarse en sus inmediaciones, bien en el mismo río Guadaíra bien en sus afluentes de Marchenilla y Gandul

Adiciones a la flora de Murcia. II

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Extraction of the antioxidant phytocomplex from wine-making by-products and sustainable loading in phospholipid vesicles specifically tailored for skin protection

The authors thank for technical and human support provided by TEM measurements carried out in the SGIker Polymer Characterization (UPV/EHU/ERDF, EU) . The authors also thank: MIUR and PON R&I for financing the PhD grant; BESTMEDGRAPE - ENI CBC Med project for providing analytical equipment and materials; Cantina Santadi for providing Carignano grape pomace. The authors acknowledge the CeSAR (Centro Servizi d'Ateneo per la Ricerca) of the University of Cagliari, Italy for the granulometry experiments performed with Mal-vern Mastersizer 3000.The present study is aimed at valorizing grape pomace, one of the most abundant winery-making by-products of the Mediterranean area, through the extraction of the main bioactive compounds from the skin of grape pomace and using them to manufacture innovative nanoformulations capable of both avoiding skin damages and promoting skincare. The phytochemicals were recovered through maceration in hydroethanolic solution. Catechin, quercetin, fisetin and gallic acid, which are known for their antioxidant power, were detected as the main compounds of the extract. Liposomes and phospholipid vesicles modified with glycerol or Montanov 82 (R) or a combination of both, were used as carriers for the extract. The vesicles were small (-183 nm), slightly polydispersed (PI >= 0.28), and highly negatively charged (--50 mV). The extract was loaded in high amounts in all vesicles (-100%) irrespective of their composition. The antioxidant activity of the extract, measured by using the DPPH (2,2-Diphenyl-1-picrylhydrazyl) test, was 84 +/- 1%, and slightly increased when loaded into the vesicles (-89%, P < 0.05). The grape pomace extract loaded vesicles were highly biocompatible and able to protect fibroblasts (3T3) from the oxidative stress induced by hydrogen peroxide.Ministry of Education, Universities and Research (MIUR)PON R

Design and evaluation of countermeasures against fault injection attacks and power side-channel leakage exploration for AES block cipher

Differential Fault Analysis (DFA) and Power Analysis (PA) attacks, have become the main methods for exploiting the vulnerabilities of physical implementations of block ciphers, currently used in a multitude of applications, such as the Advanced Encryption Standard (AES). In order to minimize these types of vulnerabilities, several mechanisms have been proposed to detect fault attacks. However, these mechanisms can have a signi cant cost, not fully covering the implementations against fault attacks or not taking into account the leakage of the information exploitable by the power analysis attacks. In this paper, four different approaches are proposed with the aim of protecting the AES block cipher against DFA. The proposed solutions are based on Hamming code and parity bits as signature generators for the internal state of the AES cipher. These allow to detect DFA exploitable faults, from bit to byte level. The proposed solutions have been applied to a T-box based AES block cipher implemented on Field Programmable Gate Array (FPGA). Experimental results suggest a fault coverage of 98.5% and 99.99% with an area penalty of 9% and 36% respectively, for the parity bit signature generators and a fault coverage of 100% with an area penalty of 18% and 42% respectively when Hamming code signature generator is used. In addition, none of the proposed countermeasures impose a frequency degradation, in respect to the unprotected cipher. The proposed work goes further in the evaluation of the proposed DFA countermeasures by evaluating the impact of these structures in terms of power side-channel. The obtained results suggest that no extra information leakage is produced that can be exploited by PA. Overall, the proposed DFA countermeasures provide a high fault coverage protection with a low cost in terms of area and power consumption and no PA security degradation

Dos nuevos híbridos de Teucrium L. (Lamiaceae)

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The relationship between conflicts and power

En este artículo se estudian y analizan las distintas definiciones de conflicto para intentar determinar que rasgos son comunes a todas ellos. La globalización y las sociedades complejas hacen que existan distintos niveles de intensidad en los conflictos y que el rango de situaciones que se producen sea muy amplio, por lo que es importante intentar encontrar los elementos comunes y configurar un modelo metodológico que ayude a establecer una aproximación a una teoría de los conflictos. Además, se propone la relación conflicto-poder como un elemento clave en el origen de los conflictos, entendiendo el poder como un potencial humano para hacer algo, para conseguir objetivos específicos e intereses personales o para superar resistencias, que determinan tanto el surgimiento del conflicto como el posterior desarrollo del mismo en base a los distintos niveles de poder de que puedan disponer las distintas partes que interactúan. Por último, se exponen los métodos más usuales de gestión de conflictos analizando la dificultad de poder desarrollar una teoría general de los conflictos que tenga carácter universal y, por tanto, la dificultad de explicitar un método general de gestionar, transformar y/o resolver los conflictos.In this paper the different definitions of conflict are studied and analyzed to obtain its common features. The globalization and the complex societies have different levels of intensity in their conflicts, and the range of situations produced is very wide. Therefore it is important to find the common elements and configure a methodological model help us to obtain an approach to a theory of conflicts. The relation between the power of parties and the origins and management of conflicts is proposed as a key, understanding the power as a human potential to make something, to get specific objectives and personal interests or to overcome resistances that determine the emergence of a conflict. Finally, the most usual methods to manage the conflicts are showed, and the difficulty to design a general Theory of Conflicts with universal amplitude for management, transformation and resolution of conflicts is analyzed

Estudio del flujo meridional en turbomáquinas axiales

En este trabajo se presenta un estudio numérico del flujo meridional en turbomáquinas axiales. Para ello se ha implementado un código numérico que resuelve el flujo meridional tanto a partir de las ecuaciones de equilibrio radial simplificado, como mediante las ecuaciones completas que modelan el flujo meridional, usando la función de corriente, mediante la teoría clásica del disco actuador. El trabajo ha partido del estudio para flujo incompresible, siendo validado para las configuraciones encontradas en bibliografía y se ha implementado una aplicación informática genérica para la resolución del problema de análisis directo así como para el problema inverso (en el caso de imponer una ley torsional genérica). Asimismo se ha extendido el análisis de cascadas aisladas de estator y rotor a escalonamientos y turbomáquinas con múltiples escalonamientos. Finalmente tras el proceso de análisis y validación de los métodos implementados se ha pasado a la extensión del análisis a escalonamientos de cascadas en turbomáquinas térmicas. Para ello se ha complementado el método del disco actuador, mediante la inclusión de los términos asociados a densidad variable, tratándolos como términos fuente correctores.In this work a numerical analysis of meridional flow in axial turbomachinery has been performed applying the actuator disk theory. A numerical tool for non compressible flows was implemented based on the actuator disk theory, improving the results from the simple radial equilibrium analysis. Later on the model was also extended to the analysis for compressible flows under the actuator disk theory

Analytical Solutions to Minimum-Norm Problems

For G is an element of Rmxn and g is an element of Rm, the minimization min parallel to G psi-g parallel to 2, with psi is an element of Rn, is known as the Tykhonov regularization. We transport the Tykhonov regularization to an infinite-dimensional setting, that is min parallel to T(h)-k parallel to, where T:H -> K is a continuous linear operator between Hilbert spaces H,K and h is an element of H,k is an element of K. In order to avoid an unbounded set of solutions for the Tykhonov regularization, we transform the infinite-dimensional Tykhonov regularization into a multiobjective optimization problem: min parallel to T(h)-k parallel to andmin parallel to h parallel to. We call it bounded Tykhonov regularization. A Pareto-optimal solution of the bounded Tykhonov regularization is found. Finally, the bounded Tykhonov regularization is modified to introduce the precise Tykhonov regularization: min parallel to T(h)-k parallel to with parallel to h parallel to=alpha. The precise Tykhonov regularization is also optimally solved. All of these mathematical solutions are optimal for the design of Magnetic Resonance Imaging (MRI) coils

Pareto Optimality for Multioptimization of Continuous Linear Operators

This manuscript determines the set of Pareto optimal solutions of certain multiobjective-optimization problems involving continuous linear operators defined on Banach spaces and Hilbert spaces. These multioptimization problems typically arise in engineering. In order to accomplish our goals, we first characterize, in an abstract setting, the set of Pareto optimal solutions of any multiobjective optimization problem. We then provide sufficient topological conditions to ensure the existence of Pareto optimal solutions. Next, we determine the Pareto optimal solutions of convex max-min problems involving continuous linear operators defined on Banach spaces. We prove that the set of Pareto optimal solutions of a convex max-min of form max parallel to T(x)parallel to, min parallel to x parallel to coincides with the set of multiples of supporting vectors of T. Lastly, we apply this result to convex max-min problems in the Hilbert space setting, which also applies to convex max-min problems that arise in the design of truly optimal coils in engineering