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Why take a doctoral degree at the UPC

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Because of Excellence

The UPC is listed in the main international rankings as one of the top technological and research universities in southern Europe and is among the world's 40 best young universities.

Its main asset: people

Satisfaction with the work of the thesis supervisor is highlighted by 7 out of 10 UPC doctoral students. Support and availability get the best ratings.

Internationalisation

More than half of the students of the UPC’s Doctoral School are international and a third obtain the International Doctorate mention.

 

Graduate employment of a high quality

Almost all UPC doctoral degree holders are successful in finding employment, mostly in jobs related to their degree.

The best industrial doctorate

The UPC offers the most industrial doctoral programmes in Catalonia (a third) with a hundred companies involved.

The industrial setting

The UPC’s location in an especially creative and innovative industrial and technological ecosystem is an added value for UPC doctoral students.

Theses for defense agenda

Reading date: 04/03/2024
  • COLLADOS RODRÍGUEZ, CARLOS: Stability analysis of modern power systems
    Author: COLLADOS RODRÍGUEZ, CARLOS
    Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
    Programme: DOCTORAL DEGREE IN ELECTRICAL ENGINEERING
    Department: (DEE)
    Mode: Normal
    Deposit date: 18/12/2023
    Reading date: 04/03/2024
    Reading time: 11:30
    Reading place: Aula 28.8 - (Escola Tècnica Superioir d'Engineria Industrial de Barcelona-ETSEIB) Av. Diagonal, 647, Les Corts, 08028 BarcelonaUPC
    Thesis director: GOMIS BELLMUNT, ORIOL | PRIETO ARAUJO, EDUARDO
    Committee:
         PRESIDENT: ANTA MARTINEZ, ADOLFO
         SECRETARI: CEBALLOS RECIO, SALVADOR
         VOCAL: D\'ARCO, SALVATORE
    Thesis abstract: The massive installation of converter-based resources, such as wind and solar photovoltaic power plants and High Voltage Direct Current (HVDC) systems, is resulting in a profound transformation of power systems and their operation. In this context of modern power-electronics-dominated power systems, the converters¿ control will play a key role in their performance and stability. This thesis focuses on the stability analysis of converter-dominated power systems, encompassing both small-signal and transient stability, aiming to understand the fundamental operation and limitations of such modern power systems.First, the two most extended Voltage Source Converter¿s (VSC) control approaches, grid-following (GFOL) and grid-forming (GFOR), are compared via time domain simulations under different disturbances to identify the main characteristics and potential limitations of both control strategies. Regardless of the converter¿s control selected, power system stability must always be ensured, both for small-signal and transient disturbances. In this work, thorough fundamental small-signal analysis are conducted to understand the principles governing network stability in converter-dominated power systems. For this purpose, a methodology to build accurate EMT linear state-space models of large power systems has been implemented. Using these models, a detailed analysis is developed to identify the stability limits of grid-following operation in an essential system, investigating the influence of the VSC¿s controllers on the system stability, revealing the main mechanisms of interaction and identifying the minimum synchronous generation to ensure system stability. This work is later extended to a larger power system with several generators in presence of an HVDC link. To this end, an index-based methodology has been developed, which determines the steady-state, small-signal and transient analysis regions of stability.Additionally, previous publications have proved that grid-forming operation can improve power system stability for high penetrations of converters. In this thesis, a comprehensive study of frequency dynamics in modern low-inertia power systems is provided, revealing that the VSC¿s dominance can be an opportunity to shape frequency dynamics, which can be designed to follow the desired response. However, considering the GFOR converter¿s limitations can lead to synchronisation loss. Therefore, this work analyses the risk of synchronisation loss during frequency excursions for droop-based GFOR converters when active power limitations are considered. In addition, a control modification is proposed to extend the operation frequency range of GFOR converters.Finally, a transient stability study is performed for a future HVDC system that will connect the Balearic power system to the Spanish peninsula. In this realistic scenario, both GFOL and GFOR operation modes are studied, considering several contingencies in the system, such as faults in different locations and line disconnections.
Reading date: 05/03/2024
  • TURON PUJOL, FRANCESC: Definition of multidimensional reduced order models for the elastic analysis of large composite structures.
    Author: TURON PUJOL, FRANCESC
    Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
    Programme: DOCTORAL DEGREE IN STRUCTURAL ANALYSIS
    Department: (DECA)
    Mode: Normal
    Deposit date: 06/02/2024
    Reading date: 05/03/2024
    Reading time: 11:00
    Reading place: Presencial Sala O.C. Zienkiewicz (Centre Internacional Mètodes Numèrics a l'Eng. C. Gran Capità, s/n Edifici C1 2a planta. Campus Nord, UPC Video call link: https://meet.google.com/aqc-mknb-erp
    Thesis director: MARTINEZ GARCIA, JAVIER | OTERO GRUER, FERMÍN ENRIQUE
    Committee:
         PRESIDENT: BONET CARBONELL, JAVIER
         SECRETARI: TURON TRAVESA, ALBERT
         VOCAL: TIJS, BAS
    Thesis abstract: Modern composite materials, primarily based on the union of polymeric matrices and fibers of glass, carbon or any other fiber of remarkable rigidity, have paved the way for the design and manufacture of lightweight structures that are at the same time extremely stiff and resistant. The very nature of these composite materials and their manufacturing methods have increased the complexity of both the shapes and the designs of the manufactured structures, giving rise to sophisticated laminates joined by transitions with the presence of reinforcements or lightweights.Numerical computational methods, most notably the finite element method, play a key role in the contemporary design and development of this state-of-the-art engineering composite structures. Over the past fifty years, these methods have evolved exponentially alongside computational power. However, the increased complexity of computations stemming from reproducing such materials' behaviors and discretizing their geometries among others, necessitates of a continuous effort to reduce and optimize their computational costs.The discretization of these geometries and the resulting mesh have a direct impact on the computational cost, particularly pronounced in the analysis of slender structures such as beams and shells characteristic of composite materials, where the discretization demands a large number of finite elements in order to capture the stress distribution variations taking place through the laminates. All together further accentuates the need for analytical methodologies that balance computational efficiency and accuracy.To address this challenge, multiple kinematic models have been proposed over time that parameterize the kinematics of a regular beam or laminate with a reduced number of variables, concentrating all the discretization to simple lines or surfaces respectively. However, they are not able to predict the behavior when the laminate loses its regularity, i.e. at and around discontinuities, regions which are usually more critical and therefore of more interest.In, this context, this work explores two methodologies, the second-order multiscale analysis for beam and shell models and the kinematic coupling between models based on the work equilibrium, once presented, it adapts them to irregular beams and laminate areas. For the former, a homogenization process is proposed to characterize, at the constitutive level, the stiffness of irregular regions within the laminate by defining a set of boundary conditions. Regarding the kinematic coupling, it is adapted to layered laminar models, typical of composite structures, thus allowing the use of the most cost-effective model in each region of the structure. The coupling is then used to develop reduced order models compatible with beam and shell elements capable of capturing the stiffness of both regular and irregular regions.This work concludes by acknowledging the potential for further improvement and innovation in these approaches, especially concerning the study of composite structures in regions with discontinuities not easily addressed by conventional shell or beam models.
Reading date: 06/03/2024
  • PRAT ORTELLS, JAUME: Espai núvol: una anàlisi de l¿arquitectura de RCR arquitectes a través de les seves atmosferes.
    Author: PRAT ORTELLS, JAUME
    Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
    Programme: DOCTORAL DEGREE IN ARCHITECTURAL DESIGN
    Department: Department of Architectural Design (PA)
    Mode: Normal
    Deposit date: 07/02/2024
    Reading date: pending
    Reading time: pending
    Reading place: pending
    Thesis director: COLL LOPEZ, JAIME | MASIP BOSCH, ENRIC
    Committee:
         PRESIDENT: BATLLE DURANY, ENRIC
         SECRETARI: CALLÍS FREIXAS, EDUARD
         VOCAL: PRIETO GONZÁLEZ, NURIA
         VOCAL: LACASTA CODORNIU, MIGUEL
         VOCAL: BAILO ESTEVE, MANUEL
    Thesis abstract: The work of RCR arquitectes is recognizable and recognized, based on intense interventions almost always represented from the inside out, deep, somber, which often incorporate this outside, this environment, in their expression: works, therefore, woven through their relationships with this environment, with the inhabitants, works that define deep spaces, gradations through architectural elements converted into filter systems; more an environment, a scene, an atmosphere, than an object. This atmospheric consideration is the basis of the understanding of the work of this study proposed by this thesis, and it does so through a journey through three scales of relationship between the work of architecture and its environment -with the atmosphere they generate- through a project associated with each of these stairs: The Entremurs House by the relationship scale of the person, the Espai La Lira for the city, the Pavelló del Baño -the smallest- for the territory. The analysis of the projects -carried out through a consultation of the original documentation deposited in the studio archives, much of it unpublished-, their relationship both with their own architecture and with many others, and an interpretation of each of these projects -all accompanied by a revisit of each of them- will allow us to introduce ourselves to the logic of the work of RCR arquitectes until we can question ourselves about a possible definition of the spaces proposed by this Study in this atmospheric key.
Reading date: 07/03/2024
  • ORELLANA BECH, BERNAT: Towards the automation of colon segmentation in magnetic resonance images
    Author: ORELLANA BECH, BERNAT
    Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
    Programme: DOCTORAL DEGREE IN COMPUTING
    Department: Department of Computer Science (CS)
    Mode: Normal
    Deposit date: 01/02/2024
    Reading date: 07/03/2024
    Reading time: 12:00
    Reading place: Sala d'Actes Manuel Martí Recober de la FIB, edifici B5, Campus Barcelona Nord URL per a la videoconferència pública: https://meet.google.com/coy-mczi-cvj
    Thesis director: MONCLUS LAHOYA, EVA | NAVAZO ALVARO, ISABEL
    Committee:
         PRESIDENT: OELTZE-JAFRA, STEFFEN
         SECRETARI: VINACUA PLA, ALVARO
         VOCAL: BOADA OLIVERAS, IMMACULADA
    Thesis abstract: The study of the colonic volume has strong relevance in gastroenterology and contributes to the diagnosis and research of lowseveritydiseases such as constipation, diarrhea, or Irritable Bowel Syndrome. In the context of these affections, the use of invasivetechniques or ionizing imaging is not advisable, and the medical experts opted for Magnetic Resonance Imaging (MRI) acquiredwithout contrast administration nor any form of patient preparation to avoid exogenous colon alteration.Specifically, two MRI modalities are of special interest: T2-weighted half-Fourier acquisition single-shot turbo spin echo sequence(T2-HASTE), which allows the segmentation of the colon lumen, and T1-weighted Fat-Sat (T1-FS), where fecal and gas contentscan be distinguished.The colon analysis requires the segmentation of the colon both in T1-FS and T2-HASTE images, which is a cumbersome and timeconsumingprocess when performed manually. Moreover, manual segmentation involves a high degree of uncertainty in the colonboundaries delimitation, which leads to arbitrariness and poor measurement repeatability.This Ph.D. Thesis proposes an end-to-end quasi-automatic framework that comprises all the steps required to accurately segmentthe colon in T2-HASTE and T1-FS images, allowing the study of its morphology and the colonic content distribution. In order to easethe validation of the automated segmentation results, a tool for the synchronized T1-FS/T2-HASTE visualization has also beendesigned.T2-HASTE segmentation is organized as a three-stage pipeline. In the first stage, a custom tubularity filter is run to detect coloncandidate areas. The specialists provide a list of points along the colon trajectory, which are combined with tubularity information tocalculate an estimation of the colon medial path. In the second stage, the colon region of interest is delimited by applying customsegmentation algorithms to detect colon neighboring regions and the fat capsule containing abdominal organs. Finally, within thereduced search space, the segmentation is performed via 3D graph-cuts in a three-stage multigrid approach.T1-FS colon segmentation is based on a non-rigid registration of the T2-HASTE image towards the T1-FS image. The mappingtransformation delivered by the registration is used to translate the T2-HASTE colon segmentation to the T1-FS space. A novelIterative Colon Registration process corrects the registered colon misalignments by employing a mesh deformation approachguided by a probabilistic model. The model provides information about the presence of feces, colonic gas, and the surrounding fat.Each iteration alternates a deformation phase with a shape-preservation phase to counterbalance the lack of boundary informationthat characterizes the regions of the colon containing gas. This process converges into an optimal fit of the colon segmentation inthe T1-FS.The experiments have proven the accuracy and usability of the algorithms, which contributed to the integration of MRI image-basedcolon analysis into the clinical routine.The results imply a substantial step towards a fully automated segmentation, speeding up the acquisition of further data for researchand diagnosis purposes while improving the repeatability of the measurements.
  • RAMIREZ CASAS, JUDITH: El ciment natural a Catalunya
    Author: RAMIREZ CASAS, JUDITH
    Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
    Programme: DOCTORAL DEGREE IN ARCHITECTURAL, BUILDING CONSTRUCTION AND URBANISM TECHNOLOGY
    Department: Department of Architectural Technology (TA)
    Mode: Normal
    Deposit date: 19/12/2023
    Reading date: 07/03/2024
    Reading time: 11:00
    Reading place: Presencial a la Sala de Graus - Planta Baixa- ETSAB
    Thesis director: ROSELL AMIGÓ, JUAN RAMON | ROSELL COLOMINA, JAUME
    Committee:
         PRESIDENT: GRAUS ROVIRA, RAMON
         SECRETARI: CHAMORRO TRENADO, MIGUEL ÁNGEL
         VOCAL: VEGAS LOPEZ-MANZANARES, FERNANDO
    Thesis abstract: In the area of architecture and construction, natural cement is the least known of traditional conglomerates. Most professionals in the sector who are interested in conglomerates have broad knowledge of the two types of lime and perhaps even of traditional plaster. However, they do not tend to be informed about natural cement. The aim of this thesis is to provide information about this type of cement in terms of how important its industry was in Catalonia and its meaning today. With this idea, we have organised the research into two parts. The first part provides a historical study of the material. It examines the first written references that reached us here, long before natural cement began to be manufactured, when and where the first natural cement was produced, how and where this industry spread around Catalonia, which types of natural cements were manufactured, their characteristics and properties, how and where they were manufactured, the first regulations governing the material, its uses, etc. This production was anonymous but relevant, with over a hundred and fifty years of history, from its beginnings in the mid-nineteenth century to the current time, spread out among various regions of Catalonia: Gironès, Alt Empordà, Ripollès and Berguedà, among many others. The second part, which we have called the present, is set from the transitory period of the civil war and postwar up to the study of natural cements that are manufactured today. A total of four quick-setting natural cements are examined. We have discovered their properties, characteristics, specific features, strengths and weaknesses.

The Doctoral School today

  • 45PhD programs
  • 2131doctoral students 21/22
  • 1591thesis supervisors 21/22
  • 305read theses 2021
  • 982021 thesis with I.M. and/or I.D.
  • 233 I.D. projects (29% from G.C. total)

I.M: International Mention, I.D.: Industrial Doctorate, G.C.: Generalitat de Catalunya