Improving the Performance of Low Voltage Networks by an Optimized Unbalance Operation of Three-Phase Distributed Generators

This work focuses on using the full potential of PV inverters in order to improve the efficiency of low voltage networks. More specifically, the independent per-phase control capability of PV three-phase four-wire inverters, which are able to inject different active and reactive powers in each phase, in order to reduce the system phase unbalance is considered. This new operational procedure is analyzed by raising an optimization problem which uses a very accurate modelling of European low voltage networks. The paper includes a comprehensive quantitative comparison of the proposed strategy with two state-of-the-art methodologies to highlight the obtained benefits. The achieved results evidence that the proposed independent per-phase control of three-phase PV inverters improves considerably the network performance contributing to increase the penetration of renewable energy sources.Ministerio de Economía y Competitividad ENE2017-84813-R, ENE2014-54115-

La construcción de las dos últimas novelas de Javier Cercas: soldados de salamina y la velocidad de la luz

Con la novela Soldados de Salamina obtuvo Javier Cercas uno de los mayores éxitos editoriales de los últimos años. Este artículo trata de desvelar, desde dentro, las claves que ha manejado el autor para escribir una novela que ha merecido el reconocimiento unánime de críticos y lectores. Así como la reincidencia en este modelo narrativo en su última novela publicada: La velocidad de la luz

Ramos Ortega, Manuel: La prosa literaria de Luis Cernuda: el libro «Ocnos».

Sin resume

A preview of the study about the rock art of Cueva del Humo, la Arana (Málaga)

Presentamos un avance del arte rupestre de la Cueva del Humo, un yacimiento de primer orden que hasta ahora se había significado por su extraordinaria secuencia estratigráfica y cultural. Es uno de los yacimientos más emblemáticos de Las Cuevas de La Araña. La existencia de grafías simbólicas en sus paredes daba una nueva dimensión al hábitat prehistórico y, dada su abundancia, desde el principio se tuvo claro que era motivo de un minucioso trabajo monográfico sobre este campo, que llevaría su tiempo. Mientras se elaboraba, éramos conscientes que había que notificar el hallazgo – cosa que hicimos en el artículo sobre la campaña de 2011 entregado al AAA– y ofrecer un avance de los trabajos en curso, tarea que acometemos hoyWe present a preview of the rock art in Cueva del Humo, an archaeological site of major importance, that has been known so far by its extraordinary stratigraphic and cultural sequence. It is one of the most emblematic sites at Cuevas de La Araña. The presence of symbolic marks on their walls gave the prehistoric habitat a new dimension, and due to their abundance, it was clear from the start that it deserved a meticulous monographic work on this matter, that would take some time to complete. During the study, we were aware that the findings had to be notified - we did so in the article about the 2011 campaign delivered to AAA (Ramos, J. 2015) - and that a preview of the works in progress had to be issued, that is the task we undertake today

Challenges and Opportunities of Waste Collection in Caracas: Sucre Municipality Case Study

This paper provides an overview of solid waste management by local authorities in the Sucre municipality in Caracas, Venezuela. Sucre is currently faced with serious demographic, economic, social, urban, and administrative challenges in solid waste management. The municipality, called Petare, has one of the largest slums in Latin America. It is estimated that more than a million people live in Petare, and 30% live in poverty. Venezuela is also facing a political problem that has affected the solid waste management throughout the country. Local authorities in Sucre have worked with communities to develop solutions to confront these difficulties

Testing genetic algorithm, recombination strategies and the normalized compression distance for computer-generated music

This is an electronic version of the paper presented at the WSEAS International Conference on Artificial Intelligence, Knowledge Engineering and Data Bases (AIKED 2006) held in Madrid (Spain) on 2006This paper analyzes the use of the normalized compression distance as a fitness function for the automatic generation of music by means of genetic algorithms, and tests the effect on performance of several genetic recombination procedures. The minimization of the distance of the generated music to a set of musical guides or targets makes it possible to obtain computer-generated music that reminds the style of a certain human author. In spite of the simplicity of the algorithm, the procedure obtains interesting results. The paper includes some considerations on the use of procedures that improve the performance of heavytailed distribution processes.This work has been sponsored by the Spanish Ministry of Education and Science (MEC), project number TSI2005-08225-C07-06

An alternative measurement of the entropy evolution of a genetic algorithm

This is an electronic version of the paper presented at The European Simulation and Modelling Conference (ESM), held in Leicester (United Kingdom) on 2009In a genetic algorithm, fluctuations of the entropy of a genome over time are interpreted as fluctuations of the information that the genome’s organism is storing about its environment, being this reflected in more complex organisms. The computation of this entropy presents technical problems due to the small population sizes used in practice. In this work we propose and test an alternative way of measuring the entropy variation in a population by means of algorithmic information theory, where the entropy variation between two generational steps is the Kolmogorov complexity of the first step conditioned to the second one. We also report experimental differences in entropy evolution between systems in which sexual reproduction is present or absent.This work has been partially sponsored by MICINN, project TIN2008-02081/TIN and by DGUI CAM/UAM, project CCG08-UAM/TIC-4425