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How resilient is a power system? An open-source tool integrating GIS and Optimal Power Flow for resilience assessment
No full textThe concept of resilience has gained prominence across diverse fields and has recently emerged as a crucial concept in power systems, complementing traditional notions of reliability, robustness, and security. Despite this, standardized approaches to integrating resilience into power system planning remain limited. This study proposes a novel framework that combines Geographic Information Systems (GIS) with AC and DC Optimal Power Flow (OPF) analysis to quantify power system resilience. A new resilience index is introduced, accounting for external hazards, system vulnerabilities, and inherent strengths. Recognizing resilience as a multi-layered challenge that requires comprehensive data management, the methodology utilizes GIS to efficiently integrate both qualitative and quantitative spatial and system data, enabling robust analysis even in data-sparse or heterogeneous environments. The methodology is implemented as an open-source tool and applied to a rural power network in Spain, illustrating how different mitigation strategies affect resilience outcomes. In the demonstrated case study, the proposed mitigation strategies reduced the system’s overall power at risk by nearly 90%. The tool constitutes a valuable resource for resilience-oriented power system planning and is freely available at [1].This work was supported by the European Union’s Horizon Europe Research and Innovation Programme under the projects iPLUG (Grant Agreement No. 101069770) and GridForLoads (Grant Agreement No. 101192350). The authors gratefully acknowledge Anell, the distribution system operator (DSO), for providing network data, and its members, particularly Natalia Fano and Carles Rodriguez, for their valuable contributions. Marc Cheah-Mañé is an associate professor within the Serra Húnter Programme. The work of Oriol Gomis-Bellmunt was supported by the ICREA Academia Programme of the Institució Catalana de Recerca i Estudis Avançats (ICREA).Postprint (author's final draft
PAISAJES EXTRACTIVOS EN DEVENIR
No full textQuarries, traditionally perceived as scars on the landscape, are revealing a surprising potential as refuges of biodiversity and spaces of ecological regeneration, where new forms of life and diverse habitats emerge. This article examines the ecological values arising in stone and aggregate quarries, both abandoned and active, and analyses how these landscapes, originating from processes of extraction and degradation, can be transformed into spaces of high environmental value. The study is approached from a dual perspective: on the one hand, spontaneous rewilding processes, in which nature reclaims the territory with little human intervention; on the other, planned restoration initiatives that foster the creation of ecosystems of high ecological quality. Through a comparative analysis of four representative case studies, the research seeks to identify recurrent processes, emerging environmental values, and key lessons that may help guide future strategies for the reclamation and management of extractive territories. Within this framework, the paper offers a critical reflection on the role of quarries as laboratories of emerging ecologies and as strategic arenas that invite us to rethink intervention practices in these transforming landscapes.Las canteras, tradicionalmente percibidas como cicatrices en el territorio, están revelando un potencial sorprendente como refugios de biodiversidad y escenarios de regeneración ecológica, donde emergen nuevas formas de vida y hábitats diversos. Este artículo examina los valores ecológicos que surgen en canteras de piedra y áridos, tanto abandonadas como en explotación, y analiza cómo estos paisajes, originados en procesos de extracción y degradación, pueden transformarse en espacios de alto valor ambiental. El estudio se aborda desde una doble perspectiva: por un lado, los procesos de renaturalización espontánea, en los que la naturaleza reocupa el territorio sin relevante intervención humana; por otro, las experiencias de recuperación planificada, que impulsan la creación de ecosistemas de elevada calidad ecológica. A partir de un análisis comparativo de cuatro casos de estudio representativos, el trabajo busca identificar procesos recurrentes, valores ambientales emergentes y aprendizajes clave que contribuyan a orientar futuras estrategias de regeneración y gestión de territorios extractivos. En este marco, se plantea una reflexión crítica sobre el papel de las canteras como laboratorios de ecologías emergentes y como escenarios estratégicos que llevan a repensar las prácticas de intervención en estos paisajes en transformación.Peer Reviewe
Bending behavior of 3D-printed sandwich panels: a finite element comparison of PLA and ABS
No full textThis study investigates the flexural behavior of 3D-printed sandwich panels manufactured from polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS) using finite element analysis. Sandwich specimens were designed and fabricated via fused deposition modelling and numerically analyzed using finite element method under three-point bending with mid-span loads of 40 N, 60 N, and 100 N. The simulations reveal a stable and predominantly linear elastic response for both materials across all load levels. Peak von Mises stresses were similar for PLA and ABS and increased almost linearly with load, reaching approximately 7.6 MPa, 11.3 MPa, and 18.9 MPa, respectively, indicating that stress distribution is mainly governed by geometry and loading conditions. In contrast, the strain response was strongly material-dependent, with PLA exhibiting lower elastic strain due to its higher flexural stiffness, while ABS accommodated larger elastic deformation
Study of stabilized mixed formulations for fluid-structure interaction problems within a variational multiscale framework
No full textThis work applies and compares mixed formulations for both fluid and solid domains in Fluid-Structure Interaction (FSI) problems to the standard irreducible formulations. The study focuses on a nonlinear setting involving laminar incompressible Newtonian fluids and hyperelastic solids, with the fluid described using an arbitrary Lagrangian-Eulerian framework and the solid modeled within a total Lagrangian framework. Stabilization is achieved through the use of the variational multiscale method, which allows for arbitrary interpolations of the unknowns. The results demonstrate that mixed formulations not only enhance stability and accuracy but also address key numerical challenges in FSI problems. These formulations effectively mitigate volumetric locking in nearly or fully incompressible materials and shear locking in bending-dominated scenarios, ensuring robust performance across a wide range of conditions. Additionally, they provide significantly improved precision in stress computations, which is particularly valuable in FSI problems where traction conditions at the interface must be accurately satisfied. While mixed formulations introduce additional degrees of freedom per node, they achieve comparable accuracy to standard irreducible formulations even with coarser meshes, making them a highly competitive and efficient alternative for complex coupled simulations. The mixed formulations are tested through FSI numerical results for semi-stationary and fully transient cases, highlighting their potential for robust and efficient FSI simulations.R. Codina gratefully acknowledges the support received from the ICREA Acadèmia Program, from the Catalan Government.Peer ReviewedPostprint (published version
El transbordament marítim de passatgers i mercaderies per l’estret de Messina, i l’impacte de la construcció del nou pont
No full textAquest treball analitza la dinàmica del transbordament marítim a l'estret de Messina i avalua l'impacte que tindrà la futura construcció del pont penjant. L'estudi s'inicia amb una revisió històrica i una descripció tècnica de les característiques oceanogràfiques de la zona, determinant com els forts corrents de marea i vents predominants com el xaloc condicionen la navegació. Així mateix, s'examinen els dispositius de control del trànsit (DST i VTS) essencials per gestionar la seguretat en aquest punt estratègic de la Mediterrània.
La metodologia es basa en l'anàlisi dels fluxos de càrrega i passatgers als ports de Messina, Villa San Giovanni i Reggio Calàbria, identificant com la saturació actual de ferris interfereix amb el trànsit passant. Paral·lelament, s'estudia el projecte d'enginyeria del nou pont, comparant les seves especificacions com la llum central i el gàlib aeri amb altres infraestructures mundials de referència per validar-ne la viabilitat tècnica davant els reptes sísmics i aerodinàmics.
Finalment, es presenten els resultats sobre l'impacte operatiu del pont. Es conclou que la infraestructura transformarà radicalment el model logístic actual, reduint la dependència del transport marítim de curta distància (Ro-Ro) en favor d'una connexió ferroviària i viària directa. Aquest canvi permetrà reordenar el trànsit marítim, disminuint els encreuaments transversals i millorant significativament la seguretat global de la navegació a l'estret
PROJECTE DE PROGRAMACIÓ (Examen final, 1r quadrimestre)
No full textExamen final - Enunciat i solucióResolved2025/20261r quadrimestr
INFRAESTRUCTURES DEL TRANSPORT AERI (Examen final, 1r quadrimestre)
No full text2025/20261r quadrimestr
