Now showing items 1-20 of 341

    3D simulation of magneto-mechanical coupling in MRI scanners using high order FEM and POD 

    Seoane Chouciño, Marcos (Date of defense: 2020-07-15)

    Magnetic Resonance Imaging (MRI) scanners have become an essential tool in the medical industry due to their ability to produce high resolution images of the human body. To generate an image of the body, MRI scanners combine ...

    A coupled CFD-DEM model for sand production in oil wells 

    Climent Pera, Natalia (Date of defense: 2016-10-17)

    During the oil recovery a hole is drilled, the sandstone is left unsupported next to the cavity and disloged sand grains can enter the oil recovery system. This process is called sand production and several problems may ...

    A double-porosity formulation for the THM behaviour of bentonite-based materials 

    Vasconcellos, Ramon Barboza de (Date of defense: 2021-05-18)

    The thermo-hydro-mechanical (THM) behaviour of expansive clays has been extensively studied in the last decades due to the potential use of bentonites as components of engineered barrier systems (EBS) in deep geological ...

    A machine learning based material homogenization technique for masonry structures 

    Kalkbrenner, Philip (Date of defense: 2021-11-03)

    Cutting-edge methods in the computational analysis of structures have been developed over the last decades. Such modern tools are helpful to assess the safety of existing buildings. Two main finite element (FE) modeling ...

    A micromechanical study of the Standard Penetration Test 

    Zhang, Ningning (Date of defense: 2020-01-20)

    This thesis explores the potential of models based on the discrete element method (DEM) to study dynamic probing of granular materials, considering realistic particle-scale properties. The virtual calibration chamber ...

    Accelerated cementitious matrices : hydration, microstructure and mechanical strength 

    Salvador, Renan Pícolo (Date of defense: 2016-12-12)

    Sprayed concrete is widely used as structural support for the stabilization of tunnel walls and underground constructions. The performance of sprayed cementitious matrices containing accelerators is strongly related to ...

    Activación alcalina de residuos urbanos e industriales para la construcción de piezas prefabricadas 

    García Díaz, Yineth Paola (Date of defense: 2023-09-27)

    (English) A comprehensive evaluation of various industrial and urban by-products was conducted to determine their potential as precursors for alkali-activated materials (AAM) in Spain. Over 15 by-products were identified ...

    Adaptive mesh simulations of compressible flows using stabilized formulations 

    Bayona Roa, Camilo Andrés (Date of defense: 2017-12-15)

    This thesis investigates numerical methods that approximate the solution of compressible flow equations. The first part of the thesis is committed to studying the Variational Multi-Scale (VMS) finite element approximation ...

    Advanced computationally efficient modeling of RC structures nonlinear cyclic behavior 

    Alfarah, Bashar (Date of defense: 2017-06-09)

    Under severe seismic excitation, structural behavior of buildings and other constructions is highly complex. It involves, among other issues, soil-structure interaction, large strains and displacements, damage, plasticity, ...

    Advanced exploitation of Sentinel-1 data for supporting landslide risk analysis 

    Barra, Anna (Date of defense: 2022-04-22)

    Satellite Synthetic Aperture Radar Interferometry (InSAR) and Persistent Scatterer Interferometry (PSI) are now consolidated tools for ground movement detection and monitoring. Sentinel-1 (S1) is the first satellite providing ...

    Advanced image analysis techniques for laboratory experiments on soils 

    Parera Morales, Ferran (Date of defense: 2020-01-27)

    The understanding of soil behavior is the foundation where the geotechnical engineering is built on. Experimentation is essential to improve this comprehension, and then to be able to translate it into models, theories, ...

    Advanced physics-based and data-driven strategies 

    Ibáñez Pinillo, Rubén (Date of defense: 2019-09-02)

    Simulation Based Engineering Science (SBES) has brought major improvements in optimization, control and inverse analysis, all leading to a deeper understanding in many processes occuring in the real world. These noticeable ...

    Advancement of methods for passive acoustic monitoring : a framework for the study of deep-diving cetacean 

    Solsona Berga, Alba (Date of defense: 2019-01-30)

    Marine mammals face numerous anthropogenic threats, including fisheries interactions, ocean noise, ship strikes, and marine debris. Monitoring the negative impact on marine mammals through the assessment of population ...

    Advances in life cycle assessment of plastics with mineral fillers in packaging applications 

    Civancik-Uslu, Didem (Date of defense: 2019-05-16)

    Mineral masterbatches, in other words mineral fillers, are concentrates of calcium carbonate or talc in a polymer base. In addition to their optimal cost, their use improves mechanical properties of materials and reduce ...

    Advancing in the characterization of coastal aquifers : a multimethodological approach based on fiber optics distributed temperature sensing 

    Del Val Alonso, Laura (Date of defense: 2020-06-03)

    Detailed characterization of coastal aquifers is essential for proper management of coastal groundwater resources, and coastal areas in general. Still, there is a general lack of systematic monitoring and detailed ...

    An approach for hydrogeological data management, integration and analysis 

    Criollo Manjarrez, Rotman A. (Date of defense: 2019-03-08)

    The conceptualisation of a groundwater system involves continuous monitoring and evaluation of a large number of parameters (e.g., hydraulic parameters). Regarding hydraulic properties of the aquifers, their quantification ...

    Analyse multi-échelle de l'approche énergétique de la rupture des grains au sein de matériaux granulaires 

    Salami, Younes (Date of defense: 2017-01-11)

    Au cours des dernières années, les analyses multi-échelles en mécanique des sols granulaires deviennent de plus en plus répandues. L’avantage de ce type d’approches réside dans leur capacité à établir un lien entre les ...

    Analysis of seismic pounding of moderate-height RC buildings with aligned slabs 

    Kharazian, Alireza (Date of defense: 2017-11-23)

    Collision between adjoining buildings is relevant, since the huge impact forces significantly modify the buildings dynamic behaviour. The separation required by the regulations avoids pounding; however, even in recent ...

    Analysis of the aerosol-radiation-cloud interactions through the use of regional climate/chemistry coupled models 

    Baró Esteban, Rocío (Date of defense: 2017-06-23)

    The response of the climate systems to aerosols and their effect on the radiative budget of the Earth is the most uncertain climate feedback and one of the key topics in climate change mitigation. Air quality-climate studies ...

    Analysis of the impact of organic pollutants on marine microbial communities 

    Cerro Gálvez, Elena (Date of defense: 2019-09-19)

    Increasing amounts of organic synthetic chemicals are currently emitted to the environment by human activities. The more recalcitrant fraction of this pollutant mixture reaches marine ecosystems mainly through rivers, ...