Now showing items 146-165 of 206

    Marine sensor interoperability applied to in situ ocean sound processing 

    Martínez Padró, Enoc (Date of defense: 2021-07-09)

    There has always been background sound in the oceans due to natural factors. However, since the first hydrophone deployments at mid-20th century, measured ocean sound levels have been steadily rising due to an increment ...

    Mesura de la conductivitat de l'aigua amb elèctrodes capacitius 

    Aliau Bonet, Carles (Date of defense: 2015-12-21)

    Electric conductivity is a good estimator of water quality. It can be measured by using cells with direct contact between the electrodes and the electrolyte, inductive cells or cells with capacitive electrodes. The use of ...

    Methods of covert communication of speech signals based on a bio-inspired principle 

    Ballesteros Larrota, Dora María (Date of defense: 2013-07-15)

    This work presents two speech hiding methods based on a bio-inspired concept known as the ability of adaptation of speech signals. A cryptographic model uses the adaptation to transform a secret message to a non-sensitive ...

    Metodología de diseño lógico redundante para escenarios con ruido extremadamente alto y bajo voltaje de alimentación 

    García Leyva, Lancelot (Date of defense: 2016-01-19)

    In future scenarios of low power and low voltage the electronic systems will present a high error ratio or voltage fluctuations due to dramatically signal to noise ratio. These transient errors can affect the logical results ...

    Métodos objetivos estadísticos de valoración de la magnitud de interés en base a las trayectorias de dirección de visionado 

    López Palma, Manuel (Date of defense: 2020-10-23)

    In this work, a new method is presented to quantify the attention paid by people to the different objects in their environment. The new metric models the eye to determine the attention given and quantifies that attention ...

    Mixed-signal alternate test and binning using digitally encoded signatures 

    Gómez Pau, Álvaro (Date of defense: 2017-07-11)

    Integrated circuit industry has always faced the necessity of testing and verifying the fabricated ICs in order to guarantee that no faulty circuits reach the market as well as the fabricated devices function within design ...

    Modeling, control and design of AC microgrids in islanded mode 

    Rey López, Juan Manuel (Date of defense: 2016-07-16)

    The present doctoral thesis is focused on the analysis and design of control strategies for the secondary control layer of islanded AC microgrids without the use of communications. The work is submitted as a compendium of ...

    Modelos no lineales y control en modo deslizamiento de convertidores de estructura resonante 

    Castilla Fernández, Miguel (Date of defense: 1998-05-28)

    El presente trabajo de investigación se ha dedicado al estudio y la caracterización de un conjunto de sistemas electrónicos de potencia basados en convertidores resonantes Quantum con subsistemas de control en modo de ...

    Modulador óptico cuasiestático en la banda del infrarrojo basado en la ritf 

    Ortega Redondo, Juan Antonio (Date of defense: 1997-12-19)

    Esta tesis doctoral contribuye a la búsqueda de alternativas para la sustitución de la técnica clásica demodulación de la radiación infrarroja, basada en unarueda "chopper". Esta técnica de modulación óptica, seutiliza en ...

    Modulation and control of three-phase PWM multilevel converters 

    Pou Félix, Josep (Date of defense: 2002-11-11)

    La present tesi doctoral estudia els inversors trifàsics multinivell del tipus denominat de díodes de fixació (diode-clamped converters). Aquests convertidors poden generar tres o més nivells de tensió a cada fase de ...

    Modulation strategies for the neutral-point-clamped converter and control of a wind turbine system 

    Zaragoza Bertomeu, Jordi (Date of defense: 2011-11-25)

    Els convertidors multinivell són topologies de convertidors d’electrònica de potència que poden generar tres o més nivells de voltatge en cadascuna de les fases de sortida. Com a resultat, els voltatges i corrents generats ...

    Monitor amb control strategies to reduce the impact of process variations in digital circuits 

    Mauricio Ferré, Joan (Date of defense: 2015-12-14)

    As CMOS technology scales down, Process, Voltage, Temperature and Ageing (PVTA) variations have an increasing impact on the performance and power consumption of electronic devices. These issues may hold back the continuous ...

    Monitoring switch-type sensors and powering autonomous sensors via inductive coupling: application to removable seats in vehicles 

    Albesa Querol, Joan (Date of defense: 2012-07-18)

    This thesis explores the feasibility of using inductive links for a vehicle application where wiring an electronic control unit (ECU) to the sensors or detectors become unfeasible or unpractical. The selected application ...

    Monitorización ambulatoria de fluctuaciones y síntomas motores mediante acelerómetros : contribución a la diagnosis y seguimiento de la enfermedad de Parkinson 

    Pérez López, Carlos (Date of defense: 2016-07-12)

    Parkinson's Disease (PD) is a neurodegenerative disorder that currently does not have any known cure. Although there are treatments that enable patients to have a good quality of life over many years, adverse effects, from ...

    MOS interface improvement based on boron treatments for high channel mobility SiC MOSFETs 

    Cabello Fusarés, Maria (Date of defense: 2019-12-02)

    Although silicon (Si) is used in most current commercial power semiconductor components, Si capabilities are insufficient for new energy conversion requirements. Some of its important limitations are related with power ...

    New autonomous sensor system for the continous monitoring of the composting process from the inside 

    Rillo Moral, Francesc (Date of defense: 2016-05-12)

    The composting process is Nature's way of recycling organic wastes with a good quality organic fertilizer as a result. This process, though, needs of a thoroughly monitoring of temperature and humidity for a good resulting ...

    New processing approaches for Cu2ZnSnSe4-based solar cells 

    López Mariño, Simón (Date of defense: 2016-04-22)

    The present thesis focuses on the promising semiconductor material kesterite, Cu2ZnSn(S,Se)4, known as CZTS(e), which is used in the second generation of solar cells, generally known as thin film photovoltaics (PV). This ...

    Novel metal insulator metal capacitors based on electrosprayed colloidal nanoparticles 

    Véliz Noboa, Bremnen Marino (Date of defense: 2020-01-30)

    This work develops a novel capacitor device based on the use of nanotechnology. The device starts from the exiting metal-insulator-metal (MIM) concept, but instead of a continuous insulator layer, dielectric nanoparticles ...

    Una nueva perspectiva del modelado y control de microrredes eléctricas y convertidores de potencia 

    Alfaro Aragón, Carlos Arturo (Date of defense: 2022-06-28)

    (English) This doctoral thesis focuses on the modeling and control of electrical microgrids and triphasic converters. The starting points of this research work are based on previous work on modeling electrical microgrids ...

    Obtenció d'imatges de la distribució d'impedància elèctrica en el subsòl per a la detecció d'anomalies extenses. Aplicació a la detecció d'humitat i de contaminants 

    Jordana Barnils, Josep (Date of defense: 1999-04-09)

    La conservació i protecció del medi ambient estan adquirint cada cop més importància. Un dels factors que influeixen més en la seva degradació és la contaminació. Aquesta tesi es centra en la contaminació del subsòl. com ...