Portal del coneixement obert de la UPC

Enviaments recents

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  Treball Final de Grau Accés obert

  Fabrication and characterization of superstrate planar solar cells using antimony sulfoselenide (Sb2(S,Se)3) as a light absorber

  (Universitat Politècnica de Catalunya, 2025-10-29) Burjalès del Amo, Marina; Korea Advanced Institute of Science and Technology (KAIST); Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica

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  This project describes the complete process of creating superstrate planar solar cells from antimony sulfoselenide (Sb2(S,Se)3) which is a promising future photovoltaic material. The combination of being earth-abundant elements and low production costs and non-toxic nature makes antimony chalcogenides suitable as sustainable thin-film alternatives compared to traditional materials. The FTO/CdS/Sb2(S,Se)3/PTAA/Au structure represtents the baseline structure despite being modified in certain experiments. The hydrothermal deposition method creates vertical quasi-one-dimensional ribbon structures in the absorber layer which enables efficient charge transport. The experimental part of the project combined the mastering of the baseline process together with new techniques that were expected to minimize both electronic recombination and resistive power loss. The experiments showed that maintaining a clean annealing environment produces high-quality crystals while poor PTAA Hole Transport Layer (HTL) development restricts charge collection, resulting in decreased JSC and F F values. The Scanning electron microscopy (SEM) images showed how the absorber material structure transformed during annealing through its morphological changes. A Self-Assembled Monolayer (SAM) interface was added to the process together with other experimental approaches, however, none of the new methods showed an increase in efficiency. The baseline devices reached a maximum power conversion efficiency (PCE) of 9.13%. The VOC is still limited by Shockley–Read–Hall (SRH) non-radiative recombination, which mainly occurs at the Sb2(S,Se)3/CdS interface.

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  Projecte Final de Màster Oficial Accés obert

  Quality-driven synthetic text generation for multilingual speech translation with audio large language models

  (Universitat Politècnica de Catalunya, 2025-10-28) Val Vila, Xavier; Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions

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  This thesis explores quality-driven synthetic data generation as a scalable solution for mul- tilingual speech-to-text translation (S2TT), focusing on Iberian languages with limited natural resources. Leveraging large language models (LLMs) and rigorous reference-free quality filtering via BLASER 2.0, an end-to-end pipeline was implemented to generate millions of high-quality synthetic translations. The approach demonstrates substantial improvements in translation quality and semantic similarity for low-resource languages such as Asturian and Occitan, while enabling efficient scaling to diverse linguistic do- mains. Experimental results reveal that models trained on filtered synthetic data achieve competitive and often state-of-the-art performance in S2TT tasks, and narrow the gap between direct and Chain-of-Thought cascade architectures. This work lays foundational evidence that scalable, quality-centric synthetic data pipelines are powerful enablers for inclusive, robust multilingual speech technologies, especially where manual annotation remains costly or infeasible.

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  Projecte Final de Màster Oficial Accés obert

  Analysis, design and hardware implementation of a 2oo2 safe computing platform

  (Universitat Politècnica de Catalunya, 2025-10-27) Montserrat Canals, Joan; SafeTwice SL; Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica

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  STP 2 concept: a functional safety approach, grounded in IEC 61508, for the definition, design, and implementation of a two-out-of-two (2oo2), dual Field Programmable Gate Array-based architecture. It covers the development of a SIL 4 processing platform — a particularised instantiation of the generic safety requirements expressed by the standard and its derivatives. Validated through the ISO 26262 V-model and demonstrated through a hardware prototype implementing the SPHINXS protocol for cross-synchronisation and exchange of safety-critical data.

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  Projecte Final de Màster Oficial Accés obert

  Aplicación de la metodología BIM a una estructura mixta en edificación residencial

  (Universitat Politècnica de Catalunya, 2025-10-24) Castañeda Vargas, Yeicon Smith; Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental

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  Aquest Treball Final de Màster aplica la metodologia Building Information Modeling (BIM) en un projecte real d’edificació residencial amb estructura mixta d’acer i formigó, situat a Esplugues de Llobregat (Barcelona, Espanya). El desenvolupament combina el modelatge tridimensional (3D) a Autodesk Revit 2025 amb la simulació en quatre dimensions (4D) a Autodesk Navisworks Manage 2025, la qual cosa permet representar amb precisió tant la geometria com l’armat dels elements estructurals, assolint nivells de desenvolupament (LOD) 300 i 350, a més de mostrar-ne les fases constructives. Amb la finalitat d’evidenciar els avantatges del BIM davant el mètode tradicional basat en plànols bidimensionals, es van seleccionar cinc casos d’anàlisi en què es va comparar la informació dels plànols originals amb el model digital. Aquesta comparació va permetre constatar que el pas del bidimensional al tridimensional facilita la interpretació i redueix la possibilitat d’errors a l’obra. Els resultats obtinguts demostren que la implementació del BIM millora la coordinació entre els diferents agents que participen en el projecte, anticipant errors i optimitzant processos. Així mateix, la simulació en 4D va aportar un recurs didàctic i de planificació que reforça la utilitat del model més enllà del disseny, transformant-lo en una eina integral per a la gestió de projectes d’edificació.

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  Article Accés obert

  Hybrid micro-/nanoprotein platform provides endocrine-like and extracellular matrix-like cell delivery of growth factors

  (2024-06-18) Lopez Laguna, Hector; Tsimbouri, Penelope M.; Jayawarna, Vineetha; Rigou, Ioanna; Serna, Naroa; Voltà Durán, Eric; Unzueta Elorza, Ugutz; Salmerón Sánchez, Manuel; Vázquez Gómez, Esther; Dalby, Matthew J.; Villaverde Corrales, Antonio; Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria

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  Protein materials are versatile tools in diverse biomedical fields. Among them, artificial secretory granules (SGs), mimicking those from the endocrine system, act as mechanically stable reservoirs for the sustained release of proteins as oligomeric functional nanoparticles. Only validated in oncology, the physicochemical properties of SGs, along with their combined drug-releasing and scaffolding abilities, make them suitable as smart topographies in regenerative medicine for the prolonged delivery of growth factors (GFs). Thus, considering the need for novel, safe, and cost-effective materials to present GFs, in this study, we aimed to biofabricate a protein platform combining both endocrine-like and extracellular matrix fibronectin-derived (ECM-FN) systems. This approach is based on the sustained delivery of a nanostructured histidine-tagged version of human fibroblast growth factor 2. The GF is presented onto polymeric surfaces, interacting with FN to spontaneously generate nanonetworks that absorb and present the GF in the solid state, to modulate mesenchymal stromal cell (MSC) behavior. The results show that SGs-based topographies trigger high rates of MSCs proliferation while preventing differentiation. While this could be useful in cell therapy manufacture demanding large numbers of unspecialized MSCs, it fully validates the hybrid platform as a convenient setup for the design of biologically active hybrid surfaces and in tissue engineering for the controlled manipulation of mammalian cell growth.

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