Browsing by Subject "629"
Now showing items 21-40 of 105
ConOps for a safe integration of multi-RPAS operations in civil airspace
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 ...
Contribució a la detecció de defectes singulars en els perfils de les rodes de ferrocarril mitjançant l’anàlisi de les vibracions generades en el contacte roda-carril
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 ...
Contribución al estudio del efecto de la alta velocidad en el consumo de energia y en los costes de explotación del ferrocarril
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 ...
Contribución de la implementación de las innovaciones tecnológicas en la mejora de la seguridad del sistema ferroviario español
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 ...
Contribution to the development of autonomous satellite communications networks : the internet of satellites
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 ...
Contribution to the development of pico-satellites for Earth observation and technology demonstrators
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 ...
Contributions based on cross-layer design for quality-of-service provisioning over DVB-S2/RCS broadband satellite system
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 ...
Contributions to aerostructures morphing with piezoelectric actuators
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 ...
Contributions to GNSS-R earth remote sensing from nano-satellites
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 ...
Contributions to multi-purpose GNSS positioning to support multi-frequency and multi-constellation with high accuracy and integrity
(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 ...
Contributions to real-time monitoring of the ionosphere using GNSS signals
(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 ...
Control del proceso de curado de un laminado de PRFV por ultrasonidos
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 ...
Control en modo deslizante aplicado a sistemas de acondicionamiento de potencia de satélites
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 ...
Control of distributed power in microgrids: PV field to the grid, islanding operation, and ultra-fast charging station.
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 ...
Control strategy and predictive methods for performance and component lifetime enhancement in vehicle powertrain
(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 ...
Cost-based linear holding practice and collaborative air traffic flow management under trajectory based operations
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 ...
Counter a drone via deep reinforcement learning
(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 ...
Cruise speed reduction for air traffic flow management
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 ...
Deep learning techniques for demand-capacity balancing
(English) Nowadays Air Navigation Service Providers (ANSPs) have to handle and accommodate a continuously increasing traffic demand in a scenario that is expected to be more time-efficient and cost-efficient. Meeting the ...
Desarrollo de un nuevo ensayo experimental para la evaluación de la calidad de uniones adhesivas entre componentes estructurales de composite para la indústria aeronáutica
El uso de los composites en la industria aeronáutica ha experimentado un fuerte crecimiento en los últimos años debido a la utilización de componentes de composite que realizan funciones estructurales. A menudo, para ...
