Now showing items 21-40 of 112
Pitta, Siddharth (Date of defense: 2020-07-10)
In the modern era of transportation, air travel has gained a huge pace and still kept increasing. The global demand for air transport is increasing at a rate of 6%, because of population growth and ticket price reductions. ...
Fas Millán, Miguel Ángel (Date of defense: 2019-11-22)
The gradual integration of remotely piloted aircraft systems (RPAS) in civil airspace, sharing airways with commercial flights, is expected to be completed once the legal issues and those regarding the unmanned traffic ...
Sanchís Estruch, Ricard (Date of defense: 2019-07-16)
One of the main problems presented due to the defects in the profiles of the railway wheels is the generation of vibrations and noise, and their propagation towards the environment. Defects in wheels, such as surface pitting ...
García Álvarez, Alberto (Date of defense: 2012-04-13)
The thesis analyses the effect of an increase in speed on energy consumption, pollutant emissions and railway operating costs. Besides focusing on the direct consequences of speed variation, the analysis also considers ...
Perlasia Giol, José (Date of defense: 2013-11-05)
La movilidad del transporte en España, en el modo ferroviario de ancho ibérico convencional, ha registrado entre los años 1975 y 2009 un aumento de 130 millones de kms‐tren en el año 1975 a 180 millones de kms‐tren en el ...
Barbecho Bautista, Pablo Andrés (Date of defense: 2022-05-19)
(English) The most promising solution to reduce carbon emissions due to transportation is migrating from fossil-fuel vehicles to electric vehicles (EVs). In recent years, the decisive shift of drivers to use EVs has been ...
Ruiz-de-Azua Ortega, Joan Adrià (Date of defense: 2020-11-09)
The space is experiencing a revolution due to the em ergence of satellite services to satisfy environmental, socio-econom ic, and geo-political demands. Earth Observation satellite systems have become dependable resources ...
Jové Casulleras, Roger (Date of defense: 2015-02-17)
The submitted Ph.D. thesis is a contribution to the development of pico-satellites and nano-satellites for Earth Observation and Technology Demonstrators. Development of satellites with a mass from 1 kg up to 10 kg has ...
Rendón Morales, Elizabeth (Date of defense: 2013-03-21)
Contributions based on cross-layer design for Quality-of-Service provisioning over DVB-S2/RCS Broadband Satellite Systems Nowadays, geostationary (GEO) satellite infrastructure plays a crucial role for the provisioning of ...
Arnau Cubillo, Albert (Date of defense: 2020-04-03)
Since the first models developed in the late 19th century, the applications of piezoelectric materials have been progressively growing in number. The capacity of these materials to couple electric and mechanic fields makes ...
Carreno-Luengo, Hugo (Date of defense: 2016-01-21)
Global Navigation Satellite Systems Reflectometry (GNSS-R) is a multi-static radar using navigation signals as signals of opportunity. It provides wide-swath and improved spatio-temporal sampling over current space-borne ...
Ibáñez Segura, Deimos (Date of defense: 2023-10-23)
(English) Global Navigation Satellite System (GNSS) have revolutionized location and timing technologies due to their low cost and wide availability. Initially, GNSS was limited to the american Global Positioning System ...
Timoté Bejarano, Cristhian Camilo (Date of defense: 2023-03-27)
(English) This document presents the collection of four manuscripts published during my Doctoral academic formation, which main goal has been the real-time implementation of tools to monitor the ionosphere using Global ...
Moreno Martínez, Juan Antonio (Professor d'enginyeria naval) (Date of defense: 2016-01-22)
In this PhD thesis a methodology for the quality control of reinforced fiberglass plastic manufacturing process is proposed. The system is based on the ultrasonic pulse-echo nondestructive method and longitudinal waves on ...
Calvente Calvo, Francisco Javier (Date of defense: 2001-12-14)
El sistema de acondicionamiento de potencia es clave para el funcionamiento correcto del resto de sistemas eléctricos de un satélite. Los reguladores conmutados continua - continua son las piezas que enlazan los paneles ...
Valedsaravi, Seyedamin (Date of defense: 2023-11-10)
Aquesta tesi explora el control de l'energia distribuïda en microxarxes (MG) i aborda diversos reptes relacionats amb el control, l'estabilitat, la compartició d'energia, el disseny del convertidor d'energia, la connexió ...
Martín Prieto, Álvaro (Date of defense: 2023-04-26)
(Enlish) In the past years, battery electric vehicles have been gaining market share. These vehicles are progressively seen as a viable option by customers of all kind. However, although manufacturers and research institutions ...
Xu, Yan (Date of defense: 2018-11-20)
The current air transportation system is reaching the capacity limit in many countries/regions across the world. It tends to be less efficient or even incapable sometimes to deal with the enormous air traffic demand that ...
Çetin, Ender (Date of defense: 2023-08-30)
(English) Unmanned aerial vehicles (UAV) also known as drones have been used for a variety of reasons such as surveillance, reconnaissance, shipping and delivery, etc. and commercial drone market growth is expected to reach ...
Delgado Muñoz, Luis (Date of defense: 2013-04-08)
Avui dia un considerable nombre d’infraestructures del transport aeri tenen problemes de congestió. Aquesta situació es veu empitjorada amb l’increment de trànsit existent i amb la seva densitat deguda al sistema de hub i ...