Now showing items 206-225 of 352

    Microalgae in aquaculture wastewater : a new forecasting method of production in a marine system 

    Andreotti, Valeria (Date of defense: 2019-07-12)

    In the field of aquaculture, the main microalgae application is animal nutrition, in which they can be used as an unprocessed component, or as dried material for feed preparations. Moreover, microalgae can assimilate the ...

    Microalgae-based wastewater treatment systems at demonstrative scale : gravity harvesting and thickening of biomass, and advanced design of bioreactors 

    Ortiz Ruiz, Antonio (Date of defense: 2021-12-17)

    Microalgae culture is currently receiving considerable attention for its potential in wastewater treatment and production of algal biomass from which high-value bioproducts and bioenergy can be obtained, as well as the ...

    Microbial and geochemical dynamics in soils and their impact on the hydraulic properties : from laboratory experiments to model development 

    Carles Brangarí, Albert (Date of defense: 2017-09-22)

    Most of the microorganisms on Earth are found in sophisticated colonies called biofilms. Such microbial communities may proliferate everywhere life can exist as long as nutrients are available and surface attachment is ...

    Mixed finite element formulations for strain localization and failure in plasticity 

    Benedetti, Lorenzo (Date of defense: 2017-05-11)

    Strain localization and quasi-brittle failure in frictional-cohesive materials is still an open and challenging problem in computational mechanics. Owing to its complexity and the significant implications on numerous ...

    Mixing and chemical reaction hotspots in saline-freshwater mixing zones 

    De Vriendt, Kevin (Date of defense: 2021-07-16)

    Seawater intrusion presents one of the most unique and ubiquitous groundwater problems in the field of hydrogeology. Its complex boundary conditions coupled with variable density flow results in non-uniform flow which lead ...

    Model order reduction of coupled thermo-hydro-mechanical processes in geo-environmental applications 

    Larion, Ygee (Date of defense: 2022-02-01)

    In a large number of geo-environmental applications, it is essential to model coupled processes that depend on several design parameters such as material properties and geometrical features. Thermo-hydro-mechanical (THM) ...

    Modeling capillarity and two-phase flow in granular media: from porescale to network scale 

    Puig Montellà, Eduard (Date of defense: 2019-07-16)

    Numerical simulations at the pore scale are a way to study the behavior of multiphase flows encountered in many natural processes and industrial applications. In this work, liquid morphology and capillary action are examined ...

    Modeling of container throughput in the European port system-analysis of container liner shipping networks 

    Stamatopoulos, Georgios (Date of defense: 2023-07-07)

    (English) This thesis records the evolution of the container throughput dynamics of the European port system from 2001-2020, analyses the dynamics of the European container port hierarchy with methodologies that have not ...

    Modeling of droplet dynamics in a proton exchange fuel cell electrode channel 

    Jarauta Arabi, Àlex (Date of defense: 2016-03-30)

    Fuel cells are promising alternatives to conventional energy conversion devices. Cells fueled with hydrogen are environmentally friendly and their effciency is up to 3 times higher than that of high-temperature combustion ...

    Modeling of reactive transport with particle tracking and kernel density estimators 

    Rahbaralam, Maryam (Date of defense: 2018-02-23)

    Random walk particle tracking methods are a computationally efficient family of methods to solve reactive transport problems. While the number of particles in most realistic applications is in the order of 10^6 - 10^9, the ...

    Modeling the dust life cycle and its associated meteorological processes from global to regional scales 

    Vendrell Miguel, Lluís (Date of defense: 2017-11-10)

    This thesis aims to test the ability of a non-hydrostatic multiscale mineral dust model to reproduce the physical processes associated with the dust cycle at meteorological scales ranging from synoptic to mesoscale (~100-1 ...

    Modelling fragmentation in rockfalls 

    Matas Casado, Gerard (Date of defense: 2020-11-04)

    The fragmentation process in rockfalls is a complex phenomenon that is not well understood and only a few rockfall simulation models consider it explicitly. Fragmentation significantly affects the evaluation of the hazard ...

    Modelling of isoprene distribution and cycling in the ocean 

    Rodríguez-Ros, Pablo (Date of defense: 2020-07-16)

    Isoprene (C5H8) is the most widely emitted biogenic volatile organic carbon (BVOC). It is produced in the biosphere both on land and in the ocean, and in the atmosphere it acts as a precursor of secondary organic aerosols. ...

    Modelling the relationships of medium and long-term variations of the anchovy and sardine catches in the Catalan Sea (NW Mediterranean) with the environmental drivers 

    Quattrocchi, Federico (Date of defense: 2017-10-24)

    The understanding of the driving forces involved in the abundance fluctuation of fish populations is an important requirement for conservation and management, especially in the context of environmental changes. In the North ...

    Modelling time-dependent plastic behaviour of geomaterials 

    Song, Fei (Date of defense: 2021-06-28)

    Representing the time-dependent plastic behaviour of geomaterials is a critical issue in the correct application of tunnelling design techniques such as the convergence-confinement method or numerical modelling. Furthermore, ...

    Models de priorització d'inversions utilitzant criteris de desenvolupament sostenible 

    Roigé Montornés, Núria (Date of defense: 2020-07-15)

    This Doctoral Thesis addresses aspects of interest for hydraulic infrastructure managers, such as investment decision support tools, in order to provide both decision support and the justification tools which are required ...

    Monitoring and analysis of soil-vegetation-atmosphere interactions at slope and catchment scale : Implications for mass-wasting in natural and man-made slopes 

    Oorthuis Gómez, Raül (Date of defense: 2022-07-19)

    Slope mass-wasting (SMW) due to shallow landslides or debris flows is one of the most important erosional processes in many mountainous regions together with surficial erosion by rainfall runoff. These erosive processes ...

    Monitorización de estructuras de hormigón mediante sensores de fibra óptica distribuida 

    Rodríguez Gutiérrez, Gerardo (Date of defense: 2017-07-03)

    This doctoral thesis presents the use of an opto-electronic system so-called OBR (Optical Backscattered Reflectometer) as an alternative of measurement in structural health monitoring (SHM) processes in concrete structures, ...

    Morpho-functionality of the toothed whale external ear canal 

    de Vreese, Steffen (Date of defense: 2021-06-17)

    While marine, anthropogenic noise pollution is a scientific and societal matter of concern, there is limited knowledge on how sea animals, particularly cetaceans, perceive their environment through sounds. Toothed whales, ...

    MPM modelling of landslides in brittle and unsaturated soils 

    Yerro Colom, Alba (Date of defense: 2015-11-10)

    Landslides and slope instabilities represent one of the most important problems in geotechnics causing significant damages around the world every year. Understanding the mechanics of the whole process is of particular ...