Mostrando ítems 147-166 de 207
Martínez Padró, Enoc (Fecha de defensa: 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 ...
Aliau Bonet, Carles (Fecha de defensa: 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 ...
Ballesteros Larrota, Dora María (Fecha de defensa: 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 ...
García Leyva, Lancelot (Fecha de defensa: 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 ...
López Palma, Manuel (Fecha de defensa: 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 ...
Gómez Pau, Álvaro (Fecha de defensa: 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 ...
Rey López, Juan Manuel (Fecha de defensa: 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 ...
Castilla Fernández, Miguel (Fecha de defensa: 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 ...
Ortega Redondo, Juan Antonio (Fecha de defensa: 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 ...
Pou Félix, Josep (Fecha de defensa: 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 ...
Zaragoza Bertomeu, Jordi (Fecha de defensa: 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 ...
Mauricio Ferré, Joan (Fecha de defensa: 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 ...
Albesa Querol, Joan (Fecha de defensa: 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 ...
Pérez López, Carlos (Fecha de defensa: 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 ...
Cabello Fusarés, Maria (Fecha de defensa: 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 ...
Rillo Moral, Francesc (Fecha de defensa: 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 ...
López Mariño, Simón (Fecha de defensa: 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 ...
Véliz Noboa, Bremnen Marino (Fecha de defensa: 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 ...
Alfaro Aragón, Carlos Arturo (Fecha de defensa: 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 ...
Jordana Barnils, Josep (Fecha de defensa: 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 ...