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rss_1.0 Recursos de colección

Archivo Digital UPM (85,668 recursos)
This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Electrónica

Mostrando recursos 1 - 12 de 12

1. DIseño e implementación de un control adaptativo para obteNer ZVS en un convertidor trifasico de puente activo para aplicaciones de vehículos eléctricos - Molina García, José María
En este Trabajo Fin de Máster se ha realizado un estudio sobre un convertidor trifásico de doble puente activo con una red auxiliar, con objeto de conseguir ZVS. Como aportación, este trabajo diseña e implementa un control adaptativo para la red auxiliar ARCN, con el objetivo de disminuir las pérdidas a su valor mínimo.

2. FPGA-Based Wireless Sensor Node Architecture for High Performance Applications - Valverde Alcalá, Juan
While for years traditional wireless sensor nodes have been based on ultra-low power microcontrollers with sufficient but limited computing power, the complexity and number of tasks of today’s applications are constantly increasing. Increasing the node duty cycle is not feasible in all cases, so in many cases more computing power is required. This extra computing power may be achieved by either more powerful microcontrollers, though more power consumption or, in general, any solution capable of accelerating task execution. At this point, the use of hardware based, and in particular FPGA solutions, might appear as a candidate technology, since though power...

3. Interband absorption of photons by extended states in intermediate band solar cells - Luque López, Antonio; Mellor Null, Alexander Virgil; Ramiro Gonzalez, Iñigo; Antolín Fernández, Elisa; Tobías Galicia, Ignacio; Martí Vega, Antonio
This paper considers sub-bandgap photon absorption in an InAs/GaAs quantum dot matrix. Absorption coefficients are calculated for transitions from the extended states in the valence band to confined states in the conduction band. This completes a previous body of work in which transitions between bound states were calculated. The calculations are based on the empirical k·p Hamiltonian considering the quantum dots as parallelepipeds. The extended states may be only partially extended?in one or two dimensions?or extended in all three dimensions. It is found that extended-to-bound transitions are, in general, weaker than bound-to-bound transitions, and that the former are weaker when...

4. Radiation heat savings in polysilicon production: validation of results through a CVD laboratory prototype - Ramos Cabal, Alba; Cañizo Nadal, Carlos del; Valdehita Torija, Javier; Zamorano Saavedra, Juan Carlos; Luque López, Antonio
This work aims at a deeper understanding of the energy loss phenomenon in polysilicon production reactors by the so-called Siemens process. Contributions to the energy consumption of the polysilicon deposition step are studied in this paper, focusing on the radiation heat loss phenomenon. A theoretical model for radiation heat loss calculations is experimentally validated with the help of a laboratory CVD prototype. Following the results of the model, relevant parameters that directly affect the amount of radiation heat losses are put forward. Numerical results of the model applied to a state-of-the-art industrial reactor show the influence of these parameters on...

5. Hardware-Based Particle Filter with Evolutionary Resampling Stage - Rodriguez Medina, Alfonso
Autonomous systems require, in most of the cases, reasoning and decision-making capabilities. Moreover, the decision process has to occur in real time. Real-time computing means that every situation or event has to have an answer before a temporal deadline. In complex applications, these deadlines are usually in the order of milliseconds or even microseconds if the application is very demanding. In order to comply with these timing requirements, computing tasks have to be performed as fast as possible. The problem arises when computations are no longer simple, but very time-consuming operations. A good example can be found in autonomous navigation systems...

6. Estudio Acústico y Electroacústico de la sala de conciertos Ritmo y Compás (Madrid) - Abad Sorbet, Marta
En el presente proyecto se ha realizado un estudio de las condiciones acústicas y del refuerzo sonoro de la sala de conciertos Ritmo y Compás (Madrid), repasando las principales magnitudes de calidad acústica. El proyecto combina medidas y simulaciones. Con las medidas se obtienen los parámetros acústicos de la sala, que permiten cuantificar la sensación que producen en la audiencia las cualidades acústicas de un espacio. Mediante software de simulación electroacústica (EASE) se ha generado el modelo geométrico y acústico de la sala, ajustado en base a los resultados experimentales. El objetivo fundamental del trabajo es generar un modelo virtual que refleje...

7. Absorption coefficient for the intraband transitions in quantum dot materials - Luque López, Antonio; Martí Vega, Antonio; Mellor Null, Alexander Virgil; Fuertes Marrón, David; Tobías Galicia, Ignacio; Antolín Fernández, Elisa
In this paper, we present calculations of the absorption coefficient for transitions between the bound states of quantum dots grown within a semiconductor and the extended states of the conduction band. For completeness, transitions among bound states are also presented. In the separation of variables, single band k·p model is used in which most elements may be expressed analytically. The analytical formulae are collected in the appendix of this paper. It is concluded that the transitions are strong enough to provide a quick path to the conduction band for electrons pumped from the valence to the intermediate band

8. Modelado para simulación de redes de sensores inalámbricas predespliegue basado en visualsense - Roselló Gómez-Lobo, Víctor Julián
En este proyecto fin de máster se desarrolla un modelo de simulación de la plataforma Cookies y se define una interfaz de diseño que permita reflejar la principal característica diferencial de esta plataforma, la modularidad. Para ello se propone una estructura basada en 4 submodelos independientes, uno por cada una de las capas de la plataforma, definidos con máquinas de estados o FSM (Finite State Machine). Para cada una de las capas se crean varios modelos para probar que se cumple con la condición de que las todas las funcionalidades del nodo sean independientes entre sí, manteniendo así la modularidad característica de...

9. Energy and power aware scheduling algorithm modeling for battery powered embedded systems - Wei, Jianguo
Energy management has always been recognized as a challenge in mobile systems, especially in modern OS-based mobile systems where multi-functioning are widely supported. Nowadays, it is common for a mobile system user to run multiple applications simultaneously while having a target battery lifetime in mind for a specific application. Traditional OS-level power management (PM) policies make their best effort to save energy under performance constraint, but fail to guarantee a target lifetime, leaving the painful trading off between the total performance of applications and the target lifetime to the user itself. This thesis provides a new way to deal with...

10. Energy/power consumption model for an embedded processor board - Ren, Rong
This dissertation, whose research has been conducted at the Group of Electronic and Microelectronic Design (GDEM) within the framework of the project Power Consumption Control in Multimedia Terminals (PCCMUTE), focuses on the development of an energy estimation model for the battery-powered embedded processor board. The main objectives and contributions of the work are summarized as follows: A model is proposed to obtain the accurate energy estimation results based on the linear correlation between the performance monitoring counters (PMCs) and energy consumption. the uniqueness of the appropriate PMCs for each different system, the modeling methodology is improved to obtain stable accuracies with...

11. Instrumentación virtual para la caracterización de la fiabilidad de células solares de concentración - Linio Bragado, Sonia
Este Trabajo Fin de Máster surge de la necesidad de evaluar la fiabilidad de los sistemas fotovoltaicos de concentración, los cuales han sufrido una evolución importante, pasando de usarse células solares de silicio con un 26% de rendimiento, a células multiunión III-V superando el 43% de rendimiento. Las células solares multinunión, mucho más caras y complejas que las células de silicio, no podrán ser comercializadas hasta que no se demuestre que tienen una fiabilidad comparable a las células de silicio. Con el objetivo de disponer de resultados de fiabilidad en un periodo de tiempo adecuado, se utilizan ensayos acelerados. Los ensayos...

12. Sistema de despliegue de una red de sensores inalámbricos para monitorización de entornos no accesibles - Sanz Muñoz, David
El presente Proyecto Fin de Máster tiene por objetivo el despliegue y establecimiento de una red de sensores inalámbricos en un escenario no accesible (como puede ser un volcán, una zona devastada por una catástrofe natural o un cuerpo celeste). El trabajo desarrollado se compone de varias tareas que se integran finalmente en un conjunto funcional. Por un lado, se ha puesto en marcha una red de sensores, implementando una comunicación mesh entre ellos a través de un protocolo de routing que optimiza el tráfico de la red (véase el capítulo 3). Estos nodos sensores monitorizan el entorno circundante, adaptándose dinámicamente...

 

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