Evaluating pointing errors on ergodic capacity of DF relay-assisted FSO communication systems

Ergodic capacity of decode-and-forward (DF) relay-assisted free-space optical (FSO) communication systems when line of sight is available is analyzed over gamma-gamma fading channels with pointing errors. Novel closed-form approximate ergodic capacity expression is obtained in terms of the H-Fox function for a 3-way FSO communication system when the α-μ distribution to efficiently approximate the probability density function (PDF) of the sum of gamma-gamma with pointing errors variates is considered. Moreover, we present a novel asymptotic expression at high signal-to-noise ratio (SNR) for the ergodic capacity of DF relay-assisted FSO systems. The main contribution in this work lies in an in-depth analysis about the impact of pointing errors on the ergodic capacity for cooperative FSO systems. In order to maintain the same performance in terms of capacity, it is corroborated that the presence of pointing errors requires an increase in SNR, which is related to the fraction of the collected power at the receive aperture, i.e. A 0 . Simulation results are further demonstrated to confirm the accuracy and usefulness of the derived results.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. The authors wish to acknowledge the financial support given by Spanish MINECO Project TEC2012-32606

Transformational Leadership, Task-Involving Climate, and Their Implications in Male Junior Soccer Players: A Multilevel Approach

Despite the well-known positive consequences of transformational coaches in sport, there is still little research exploring the mechanisms through which coaches’ transformational leadership exerts its impact on athletes. Multilevel SEM was used to examine the relationship between coaches’ transformational leadership style, a task-involving climate, and leadership effectiveness outcome criteria (i.e., players’ extra effort, coach effectiveness, and satisfaction with their coach), separately estimating between and within effects. A representative sample of 625 Spanish male soccer players ranging from 16 to 18 years old and nested in 50 teams completed a questionnaire package tapping the variables of interest. Results confirmed that at the team level, team perceptions of transformational leadership positively predicted teams’ perceptions of task climate, which in turn positively predicted the three outcome criteria. At the individual level, players’ perceptions of transformational leadership positively predicted teams’ perceptions of task climate, which in turn positively predicted teams’ extra effort and coach effectiveness. Mediation effects appeared at the team level for all the outcome criteria, and at the individual only for extra effort. Transformational leadership is recommended to enhance task climate, in order to increase players’ extra effort, their perceptions of the effectiveness of their coach, and their satisfaction with his/her leadership style

Parallel 3-D marine controlled-source electromagnetic modelling using high-order tetrahedral Nédélec elements

We present a parallel and high-order Nédélec finite element solution for the marine controlled-source electromagnetic (CSEM) forward problem in 3-D media with isotropic conductivity. Our parallel Python code is implemented on unstructured tetrahedral meshes, which support multiple-scale structures and bathymetry for general marine 3-D CSEM modelling applications. Based on a primary/secondary field approach, we solve the diffusive form of Maxwell’s equations in the low-frequency domain. We investigate the accuracy and performance advantages of our new high-order algorithm against a low-order implementation proposed in our previous work. The numerical precision of our high-order method has been successfully verified by comparisons against previously published results that are relevant in terms of scale and geological properties. A convergence study confirms that high-order polynomials offer a better trade-off between accuracy and computation time. However, the optimum choice of the polynomial order depends on both the input model and the required accuracy as revealed by our tests. Also, we extend our adaptive-meshing strategy to high-order tetrahedral elements. Using adapted meshes to both physical parameters and high-order schemes, we are able to achieve a significant reduction in computational cost without sacrificing accuracy in the modelling. Furthermore, we demonstrate the excellent performance and quasi-linear scaling of our implementation in a state-of-the-art high-performance computing architecture.This project has received funding from the European Union's Horizon 2020 programme under the Marie Sklodowska-Curie grant agreement No. 777778. Furthermore, the research leading to these results has received funding from the European Union's Horizon 2020 programme under the ChEESE Project (https://cheese-coe.eu/ ), grant agreement No. 823844. In addition, the authors would also like to thank the support of the Ministerio de Educación y Ciencia (Spain) under Projects TEC2016-80386-P and TIN2016-80957-P. The authors would like to thank the Editors-in-Chief and to both reviewers, Dr. Martin Cuma and Dr. Raphael Rochlitz, for their valuable comments and suggestions which helped to improve the quality of the manuscript. This work benefited from the valuable suggestions, comments, and proofreading of Dr. Otilio Rojas (BSC). Last but not least, Octavio Castillo-Reyes thanks Natalia Gutierrez (BSC) for her support in CSEM modeling with BSIT.Peer ReviewedPostprint (author's final draft

La crisis de las ciencias humanas en la actualidad

Treball de Final de Grau en Humanitats: Estudis Interculturals. Codi: HU1036. Curs acadèmic 2014-2015El siguiente proyecto, centrado en analizar la crisis que sufre el sistema educativo mundial y el grado en que el estudio de las humanidades está siendo abandonado –en todos los niveles de la escolaridad y en todos los países del mundo- en beneficio de aprendizajes más directamente vinculados con las actividades económicas. En este proyecto se intentará mostrar, por medio de diferentes autores, que cuando se promueven las habilidades técnicas por encima del estudio de las humanidades se dota a los estudiantes de herramientas útiles para el desarrollo económico pero se los priva de las habilidades necesarias para el ejercicio del pensamiento crítico.The following essay is born after four years of study in university, where philosophy has played a very determintating role. Humanities play a central role in the history of democracy. But many parents today feel ashamed of their children to study art or literature. Although the philosophy and literature have changed the world, it is much more likely that a father or mother worry that their children know nothing of business they receive inadequate training in humanities. To the extent that the budget allocated to the humanities is cut , a serious erosion of the qualities essential to democratic life occurs. The great educators and statesmen understood the importance of these disciplines at the time to teach boys and girls to apply critical thinking required to act independently and to develop a strong understanding in the power of authority and blind traditions. Also, people who study art and literature learn to imagine the situation of other human beings, this ability is essential to a thriving democracy and involves cultivating our "deep eyes ". The arts and humanities contribute to the development of girls and young children in the form of game, but also to the training of university students. The child and the student must see the world through different perspectives of vulnerability, growing wealth of imagination. Only then you can conceive of others as equals. This is what needs democracy and global citizenship

La locura divina de “Eros” en el “Fedro” de Platón

El artículo muestra la poética expresión del amor platónico en el “Fedro”, aunque apareció en el “Lisis” y tuvo su manifestación festiva en el “Banquete”. En el “Fedro”, en un paisaje lleno de sensualidad, Sócrates escucha un discurso erótico de Lisias y responde con otro, más perfecto, defendiendo una visión utilitarista del amor. Pero, de repente, la voz que le habla le invita a hacer un elogio de “Eros”, al que describe en unas páginas de sublime poesía como una locura divina que transforma los ojos y el corazón del amante y le hace volar hasta la contemplación gozosa de la belleza del bien amado..The article shows the poetic expression of the platonic love in the “Phaedrus”, although it appeared in the “Lisis” and it had its festive manifestation in the “Symposium”. In the Fedro, in a full landscape of sensuality, Sócrates listens to a erotic speech of Lysias and responds with another one, more perfect, defending a utilitarian vision of love. But, suddenly, the voice that speaks to him invites him to make a praise of the “Eros”, to that it describes in poetic pages like a divine madness that transforms the eyes and the heart of the lover and makes him fly until the joyful contemplation of the beauty of the loved good

The Relationship between Social Responsibility and Business Performance: An Analysis of the Agri-Food Sector of Southeast Spain

This study aims to contribute to the existing debate on the impact of corporate social responsibility (CSR) orientation on different measures of business performance through the proposal of a conceptual model. Drawing on stakeholder theory, we conceptualize CSR as a broad and multidimensional construct with seven dimensions: employees, partners, customers, farmers, environment, community, and competition. We also extend the concept of business performance, which includes tangible variables, namely financial performance (FP) and export performance (EXP), as well as intangible variables, namely image and reputation (IR) and the satisfaction of relevant stakeholders (SS). The research context of this study is the agri-food sector in southeastern Spain. This sector has been the focus of attention of numerous researchers due to the relevance that social and environmental aspects have had in its development. To test the proposed model, the partial least-squares technique (PLS-SEM) was applied to data collected by means of a survey from a sample of 107 companies, which represent 81.4% of the turnover of the sector analyzed. The results show that CSR has a positive effect on financial performance, improves the volume and performance of exports, positively affects the corporate image and reputation, and increases the level of satisfaction of relevant stakeholders. Further research should examine the model from the perceptions of other stakeholders (e.g., customers, employees, and suppliers), using a longitudinal research design and exploring other contexts