Universitat Politècnica de Catalunya
Ara mostrant els elements 141-160 de 207
La técnica de las ondas de Lamb acopladas por aire representa un importante avance en el área de los Ensayos No Destructivos (END) de materiales laminares.<br/>Sin embargo la compleja naturaleza de las vibraciones mecánicas ...
In nowadays nanometer technology nodes, the semiconductor industry has to deal with the new challenges associated to technology scaling. On one hand, process developers face increasing manufacturing cost and variability, ...
Premi extraordinari ex-aequo en l'àmbit d'Electrònica i Telecomunicacions. Convocatoria 1999 - 2000
Nowadays, it would be very difficult to deny the need to prioritize sustainable development through energy efficiency at all consumption levels. In this context, an energy management system (EMS) is a suitable option for ...
This PhD dissertation describes the research and development of a new low-cost medium wavelength infrared MWIR monolithic imager technology for high-speed uncooled industrial applications. It takes the baton on the latest ...
Electrochemical sensors are expanding rapidly over other chemical sensoring technologies because of their potential to generate precise, selective, miniaturized and cost-effective analytical devices. These features satisfy ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
