Criptografía clásica. ¿Cómo romper cifrados monoalfabéticos y polialfabéticos? Análisis de frecuencias y método Kasiski

Peer Reviewe

The future of intangible asset valuation for football clubs and analysis of current practices

This master thesis looks into the player valuation methods currently in place in the world of football. Players are the intangible assets of the clubs, and as such they should be correclty valued in order to predict future cashflows for investors. This is not the case, mainly due to the current regulation based on historical cost and registration transfer fees. The thesis does a revision of the literature on the topic and discusses several already studied alternatives to player valuation. Afterwards, it proposes a new method of player valuation relying on player performance and a single unit of account. In the research phase, it looks at whether valuations for certain Premier League clubs and their players are consistent with Transfermarkt values and if they are relevant for profit projections. Moreover, it also has a qualitative approach that tackles the current financial and governance problems of F.C.Barcelona, in order to understand the fans' implication and knowledge of finances in football.Outgoin

Design of controllers for electrical power systems using a complex root locus method

© 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.A large class of three-phase electrical power systems possess symmetry conditions that make it possible to describe their behavior using single-input single-output transfer functions with complex coefficients. In such cases, an extended root locus method can be used to design control laws, even though the actual systems are multi-input multi-output. In this paper, the symmetric conditions for a large class of power systems are analyzed. Then, the root locus method is revisited for systems with complex coeffcients and used for the analysis and control design of power systems. To demonstrate the benefits of the approach, this paper includes two examples: 1) a doubly fed induction machine and 2) a three-phase LCL inverter.Postprint (author's final draft

Is there anything we can do? mediterranean cities in the face of climate change

Peer ReviewedPostprint (published version

Viscoelastic Fluid Simulation with OpenFOAM

Since non-Newtonian fluids were discovered, their numerous interesting behaviours and potential uses have been investigated. Particularly, the frequency-dependent properties of wormlike micellar solutions have risen a good deal of interest among the scientific community. In this report, we have attempted to simulate those properties using the Giesekus model for viscoelastic fluids and, more precisely, we have tried to obtain a velocity profile with resonant behaviour inside a cylinder cavity. The computational environment chosen to perform the simulations is OpenFOAM, an open-source CFD program with great flexibility and capabilities. The results confirm a resonant response to oscillating boundary conditions, although perfect stationary-like velocity profiles were not obtained.2019/202

Complex-based controller for a three-phase inverter with an LCL filter connected to unbalanced grids

A new controller for a grid-connected inverter with an LCL filter is proposed in this paper. The system is described by its complex representation, and the controller is designed using the complex root locus method. The complex representation allows a considerable reduction in the order of the system, simplifying the design task and making it possible to use advanced techniques, such as the complex root locus. The new complex controller adds an extra degree of freedom that makes it possible to move the poles of the systems and to improve the stability and speed of response compared with the conventional controls. This paper includes a detailed discussion of the effect of the gains of the controller on the root locus. The proposal is validated with simulation and experimental results.Fil: Doria Cerezo, Arnau. Universidad Politécnica de Catalunya; EspañaFil: Serra, Federico Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; ArgentinaFil: Bodson, Marc. University of Utah; Estados Unido

Complex-valued sliding mode controllers for doubly-fed induction motors

© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other worksThis article presents two algorithms to control the speed of doubly-fed induction motors. The controllers are designed using the complex-valued sliding mode methodology to track either the rotor or the stator current. An outer loop controls the mechanical speed. The control schemes are validated experimentally and compared in a laboratory setup.Peer ReviewedPostprint (author's final draft

Virtual reality to enhance safety and health in construction : Online multiplayer serious game

This project is a collaboration with CIMNE in order to develop a Virtual Reality serious videogame with the objective to supply the lack of practice in the courses for workers in the construction sector, in the field of safety and health, given that nowadays most of the training is based in traditional methodologies such as master classes and paper learning material