Now showing items 1-20 of 126

    A geodetic approach to precise, accurate, available and reliable navigation 

    Parés Calaf, M. Eulàlia (Date of defense: 2021-01-14)

    The determination of a body position, velocity and attitude is the purpose of the navigation techniques. The most extended navigation systems (INS/GNSS), as any other HW and SW system, provide precise and accurate enough ...

    Ab-initio quantum Monte Carlo study of ultracold atomic mixtures 

    Cikojević, Viktor (Date of defense: 2021-04-20)

    The properties of mixtures of Bose-Einstein condensates at T=0 have been investigated using quantum Monte Carlo (QMC) methods and Density Functional Theory (DFT) with the aim of understanding physics beyond the mean-field ...

    Active flow control methods for aerodynamic applications 

    Sarwar, Wasim (Date of defense: 2020-07-17)

    The cylinder in cross flow has been the subject of many numerical and experimental studies since it provides a deep insight of the physical phenomena occurring in a wide range of flow regimes. Despite a number of investigations ...

    Analysis and degradation mechanisms of enamels, grisailles and silver stains on Modernist stained glass. 

    Beltrán González, Martí (Date of defense: 2021-01-22)

    Materials and methods used in the production of modernist (late 19th and early 20th century) stained glass from the city of Barcelona with special regards to the degradation mechanisms of enamels, grisailles and silver ...

    Analysis of energetic particle-driven Alfvénic instabilities in tokamak and stellarator plasmas using three dimensional numerical tools 

    Rakha, Allah (Date of defense: 2019-09-27)

    In this thesis, a detailed analysis of the experientially observed energetic particle-driven Alfvénic instabilities in tokamak and stellarator plasmas using three dimensional numerical tools based on the reduced MHD model ...

    Atomistic study of slip transfer in BCC metals 

    Kvashin, Nikolai (Date of defense: 2022-11-16)

    (English) The mechanical properties of structural materials, which are naturally polycrystalline, is defined by a number of physical processes that take place at different time and space scales. On several of those processes, ...

    Barocaloric effects at first-order phase transitions 

    Aznar Luque, Araceli (Date of defense: 2021-04-15)

    Current refrigeration devices, based on vapour-compression cycles, employ refrigerants such as HFCs, which exhibit a global warming potential a thousand times higher than the one produced by CO2,. Furthermore, the increasing ...

    Caracterització optoelectrònica de materials bidimensionals a altes freqüencies 

    Arcos Gutiérrez, David (Date of defense: 2022-07-19)

    Two-dimensional materials have a lot of applications in the electronic and photonic device design field, especially when they need to be flexible and transparent. In particular, high frequency applications, above 100MHz, ...

    Causal inference and forescasting methods for climate data nalysis 

    Silini, Riccardo (Date of defense: 2022-07-05)

    To advance time series forecasting we need to progress on multiple fronts. In this thesis, we develop algorithms to identify causal relations which allow to identify the driving processes containing useful information for ...

    Collective motion and collective decision-making in animal groups : from scholling fish to swarming robots 

    Múgica Gallart, Julia (Date of defense: 2023-06-07)

    (English) Collective behavior in animals is ubiquitous in nature. It emerges from the self-organization of interacting individuals within a group. What makes collective behavior so interesting is that the behavior of the ...

    Comparison of the response of different configurations of aircraft repair patches under static and dynamic loading 

    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. ...

    Computational analysis of ion cyclotron resonance frequency heating for JET experiments 

    Gallart Escolà, Dani (Date of defense: 2019-09-27)

    Heating plasmas to a relevant fusion temperature is one of the key aspects of magnetically confined fusion plasmas. Radio frequency (RF) heating with electromagnetic waves in the ion cyclotron range of frequencies (ICRF) ...

    Computer modeling of the polarity and amoeboid motion of living cells 

    Moreno Ramos, Eduardo (Date of defense: 2022-05-30)

    Cell motility is important in many biological processes. Some examples relay in epidermal cells moving towards lesions during wound healing, neutrophils cells migrating towards sites of bacterial infection as part of the ...

    Computer simulation of an excess proton in aqueous systems 

    Tahat, Amani Naser (Date of defense: 2016-06-01)

    This thesis aims at studying the microscopic physical-chemical properties of an excess proton in aqueous systems. From bulk water environments to narrow hydrophobic channels constructed with a double-layered graphene slab, ...

    Consolidation and assessment of a technique to provide fast and precise point positioning (Fast-PPP) 

    Rovira Garcia, Adrià (Date of defense: 2016-01-21)

    The research of this paper-based dissertation is focused on the Fast Precise Point Positioning (Fast-PPP) technique. The novelty relies on using an accurate ionosphere model, in combination with the standard precise satellite ...

    Contributions to GNSS-R earth remote sensing from nano-satellites 

    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 ...

    Contributions to high accuracy snapshot GNSS positioning 

    Liu, Xiao (Date of defense: 2022-11-10)

    (English) Snapshot positioning is the technique to determine the position of a Global Navigation Satellite System (GNSS) receiver using only a very brief interval of the received satellite signal. In recent years, this ...

    Contributions to ionospheric modeling with GNSS in mapping function, tomography and polar electron 

    Lyu, Haixia (Date of defense: 2020-11-17)

    This dissertation focuses on determining the vertical electron content distribution in low and high vertical resolution from ground-based and LEO on board GNSS data and improving the knowledge of ionosphere climatology in ...

    Contributions to multi-purpose GNSS positioning to support multi-frequency and multi-constellation with high accuracy and integrity 

    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 ...

    Correlations in spin-orbit coupled ultracold quantum gases 

    Sánchez Baena, Juan (Date of defense: 2020-12-14)

    The main goal of this thesis is the computation of ground state properties of quantum many-body systems under Spin Orbit coupling (SOC) interactions out of the ultradilute regime. We present two approaches to fulfill this ...