Universitat Politècnica de Catalunya
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Pla de detall d'uns dels plafons de l'exposició "Bages Ciència Ciutadana: Construïm en comunitat" a la BCUM
No full textL'exposició "Bages Ciència Ciutadana: Construïm en comunitat", sorgeix d'un projecte que té com a objectiu principal involucrar a la ciutadania en un procés científic d'observació, identificació i anàlisi dels problemes socials associats a l’envelliment, i el seu entorn més proper, per a co-crear propostes de solucions que contribueixin en la millora de la qualitat de vida de les persones de la comarca del Bages.
Dates de l'exposició a la BCUM: del 8 al 30 de gener de 2026
Control i monitorització de la flota pesquera d'arrossegament: Cas del Port de Llançà: Proposta de millora
No full textAquest treball de fi de grau analitza les limitacions dels sistemes actuals de control de la pesca d'arrossegament a la zona GSA-7 (golf de Lleó i litoral nord de Catalunya) i proposa una millora tecnològica orientada a incrementar la fiabilitat del control, la seguretat jurídica i la traçabilitat dels productes pesquers. El treball es centra en el port de Llançà, un dels ports amb major complexitat operativa a causa de la concentració de zones de veda i restriccions espacials.
La metodologia combina l'anàlisi del marc normatiu europeu, estatal i autonòmic amb l'estudi dels sistemes de control existents (AIS, VMS, diaris electrònics i sensors de bord) i la cartografia empleada. A partir aquesta anàlisis, es desenvolupa una proposta metodològica de sistema integrat que incorpora sensors embarcats (GPS, RPM, corredera, càmeres i sonda), processament local de dades i tecnologia blockchain. El sistema proposat utilitza un model híbrid de blockchain (Hyperledger Fabric i Polygon) per garantir tant la privacitat de les dades sensibles com la transparència i traçabilitat pública. Aquest sistema s'utilitza sobre una cartografia creada amb dades oficials mes acurades que les de l'Institut hidrogràfic de la marina.
La proposta es valida mitjançant una simulació teòrica que avalua la lògica de detecció, la robustesa davant falles, la carrega operativa i els temps de resposta. Els resultats indiquen que el sistema és tècnicament viable, escalable i capaç de millorar el control de l'activitat pesquera, reduir incoherències sancionadores i reforçar la sostenibilitat, traçabilitat i governança del sector
Towards the system-based design of aluminium portal frames
No full textIn structural engineering, system-based advanced design methods are increasingly recognised as sound and efficient design approaches for structural steel and stainless steel structures thanks to the reliability-based design formulations developed recently. However, the extension of such methods to aluminium structures still remains unresolved. Aluminium frames, assembled with extruded members, result not only in lower modulus of elasticity, but also in different material uncertainties than those found for steel or stainless steel alloys. Therefore, it is necessary to carry out independent reliability calibrations for this particular metal. This study represents the first effort towards extending the Direct Design Method (DDM) to aluminium portal frames under gravity loading, offering a straightforward design methodology that accounts for the key properties that influence the behaviour of these structural systems. System reliability calibrations are presented for two aluminium portal frames covering two aluminium alloys from the 6xxx series using advanced numerical simulations and First Order Reliability Method. From the calculated system reliability indices for ultimate limit states, suitable system safety factors ¿M,s and system resistance factors ¿s are proposed for the direct design of aluminium portal frames according to the European and US design frameworks under gravity loads. Furthermore, the reliability of these structures is assessed at the system level for serviceability limit state, which is found to be a governing consideration for the investigated aluminium frames. This work provides valuable insights into the application of system-based design methods to aluminium portal frames, laying the groundwork for future research and development of consistent design codes across different materials.This work was partly supported by the Croatian Science Foundation under the project number HRZZ-IP-2022-10-9298 (REAL-fit: Reliable design methods for aluminium structures fit for the future requirements, project leader: Davor Skejic).Peer ReviewedPostprint (published version
Pla de conjunt de la premiada Estel Blay Carreras durant la seva intervenció a l'acte de lliurament del Premi Rosa Argelaguet i Isanta a la BCUM
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Towards scalable multi-chip wireless networks with near-field time reversal
No full textThe concept of Wireless Network-on-Chip (WNoC) has emerged as a potential solution to address the escalating communication demands of modern computing systems due to its low-latency, versatility, and reconfigurability. However, for WNoC to fulfill its potential, it is essential to establish multiple high-speed wireless links across chips. Unfortunately, the compact and enclosed nature of computing packages introduces significant challenges in the form of Co-Channel Interference (CCI) and Inter-Symbol Interference (ISI), which not only hinder the deployment of multiple spatial channels, but also severely restrict the symbol rate of each individual channel. In this paper, we posit that Time Reversal (TR) could be effective in addressing both impairments in this static scenario, thanks to its spatiotemporal focusing capabilities even in the near-field. Through comprehensive full-wave simulations and bit error rate analysis in multiple chip layouts with multiple frequency bands, we provide evidence that TR can increase the symbol rate by an order of magnitude, enabling the deployment of multiple concurrent links and achieving aggregate speeds exceeding 100 Gb/s. Finally, we evaluate the impact of reducing the sampling rate of the TR filter on the achievable speeds, paving the way to practical TR-based wireless communications at the chip scale.Authors acknowledge support from the European Union’s Horizon Europe research and innovation program under grant agreement 101042080 (WINC) as well as the European Innovation Council (EIC) PATHFINDER scheme, grant agreement No 101099697 (QUADRATURE).Peer ReviewedPostprint (published version
Machine learning surrogates for unreinforced masonry tensile-strength prediction
No full textWith advances in computational modeling, finite- or discrete-element method-based computational models are often used to conduct nonlinear structural analysis of masonry construction. However, such detailed models are computationally intensive, limiting their usefulness in preliminary analysis or applications requiring real-time simulations (e.g., developing digital twins). A possible solution, increasingly used in other building science areas (e.g., energy efficiency), is developing machine-learning-based surrogate models that mimic the performance of complex physics-based simulation models at significantly reduced computational costs. However, little is known about the premise of this approach in the context of masonry tensile strength prediction due to the scarcity of such applications in the literature. This research proposes a framework to develop and evaluate the performance of machine learning surrogate models in emulating the performance of masonry tensile-strength prediction models. A five-step methodology is proposed: (1) develop computational physics-based models based on the discrete element method (DEM), (2) validate the proposed computational models, (3) generate a data set through parametric variations to support surrogate modeling, (4) train and test data-driven surrogate models to emulate the capabilities of the computational models, and (5) conduct a sensitivity analysis to determine the most influential input parameters. The presented generic approach is demonstrated using a validated discontinuum-based computational modeling strategy based on the DEM. The model predicts the tensile strength and corresponding strain value of unreinforced masonry walls subjected to diagonal compression forces. Results show that the gradient boosting (GB) surrogate models consistently achieved high accuracy levels (¿2>0.9) even when using small data sets (e.g., 100 samples). However, compared to linear regression, GB exhibited increases in training and tuning time for large sample sizes. The proposed framework offers unique insights into the premise of data-driven surrogate models to complement and support computational-based techniques, balancing predictive accuracy and model complexity. Additional case studies are required to generalize results to other masonry configurations and contexts.The second author acknowledges the funding received from the Canada Research Chairs (CRC) program. The third author acknowledges the grant RYC2022-037263-I funded by MICIU/AEI/10.13039/501100011033 and the European Social Fund Plus(ESF+). Also, the corresponding author gratefully acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) grant RGPIN- 2022-04938Peer ReviewedPreprin
MBArch Master's Degree in Urbanism
No full textThe Urbanism track of the official MBArch, taught at the Barcelona School of Architecture, continues the experience of the official Urbanism Master of Research, with a long tradition and international recognition. This track is offered in English or in Spanish (MBArch Urbanismo).
This line examines urban phenomena from different perspectives, combining research with design, specialisation with interdisciplinary approaches, and theory with practice, offering new interpretations and areas for original reflection.
This track offers the necessary training complements for the PhD Program in Urbanism, distinguished since its inception with the Mention of Excellence, and opens the possibility to continue with doctoral studies in Urbanism.
This line aims to train professionals to face the challenges of contemporary urbanism and to attend to the development of new analysis and project tools to intervene in diverse contexts.
Read more about our programme:
https://mbarch.masters.upc.edu/en/master-tracks/urbanism-english-track
Contact:
[email protected]
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@mbarch_urbanis
Història i evolució del xifratge RSA
No full textPresentem RSA com un cas central de criptografia de clau pública, connectant els fonaments matemàtics amb una visió moderna de la seguretat. S’explica el funcionament d’RSA i per què la versió “bàsica” no és adequada en aplicacions reals. A continuació s’introdueix el paper de les tècniques de padding i s’analitzen dues construccions estandarditzades: RSA–OAEP per a xifratge i RSASSA–PSS per a signatures digitals. El treball conclou amb una síntesi de l’evolució històrica cap als criteris actuals i amb recomanacions generals per a una implementació segura