Universitat Politècnica de Catalunya

Greenland's Topography Triggers Cyclogenesis: Synergy Between Lee Cyclogenesis and Jet Streak

Abstract Arctic cyclones play a crucial role in shaping Arctic weather patterns and influencing sea ice concentrations. During the Multidisciplinary Drifting Observatory for the Study of Arctic Climate expedition in April 2020, an Arctic cyclone was observed at the leeside of Gre...

Burned Area Evidence for Process-Sensitive Post-Fire Hydrogeomorphic Monitoring Across Mediterranean and Iberian–Atlantic Regions

In operational terms, post-fire landscapes require monitoring priorities that reflect hydrogeomorphic susceptibility rather than burned extent alone. This study tests whether European Forest Fire Information System (EFFIS) burned area evidence, combined with open terrain, rainfal...

Sustainable [EMIM]OAc–NanocelluloseIonogelsfor Flexible High-Performance Supercapacitors

Abstract The increasing global demand for sustainable energy storage systems has intensified the investigation for advanced materials that combine high performance with environmental compatibility. In this context, ionogel electrolytes (IGEs) have emerged as promising candidates...

Critical neuronal avalanches arise from excitation-inhibition balanced spontaneous activity

Neuronal avalanches are sequences of neural activations exhibiting scale-invariant statistics, indicative of critical dynamics. Theoretical studies proposed that the balance between excitation (E) and inhibition (I), along with neuromodulation, are key factors influencing this cr...

Experimental evidence and consequences of biomolecular corona formation on inhaled mRNA lipid nanoparticles

Abstract Inhalable messenger RNA (mRNA) therapeutics are moving pulmonary drug delivery from local deposition of small molecules toward transient, programmable expression of antigens, secreted proteins, antibodies, gene-editing enzymes and replacement proteins directly within the...

Evaluating the classification performance and data requirements of Catch22 features on noisy and short synthetic time series

Abstract This study evaluates the performance, data requirements, and computational efficiency of the feature extraction tool Catch22 for time-series classification. Using synthetic sinusoidal signals and nonlinear signals generated with the FitzHugh-Nagumo (FHN) model, we system...

Geographies in flux - how time and location influence shrinking medium-sized cities

Urban shrinkage has emerged as a significant challenge across Europe, particularly for medium-sized cities (MSCs) with populations between 20,000 and 100,000. While previous research has largely focused on demographic decline in large cities, the spatial and institutional dynamic...

Measuring masses of transiting Earth-like planets: first insights from the PLATO RV Data Challenge

Abstract The PLATO Stellar Variability Mitigation Working Group designed a radial-velocity (RV) data challenge to assess the precision and accuracy achievable on RV semi-amplitudes in the context of the future PLATO follow-up. Using Sun-as-a-star observations obtained with HARPS-...

Temperature and relative humidity differentially affect deltamethrin and malathion toxicity in the mosquito Culex quinquefasciatus

Background Temperature and relative humidity are key drivers of ectotherm physiology, yet their combined effects on insecticide performance remain poorly understood. Here, we experimentally quantified how both temperature and relative humidity influence the toxicity of two widely...

A Novel Hybrid Active-Passive Neutral-Point-Clamped Multilevel Conversion Topology

This paper presents a novel multilevel neutral-point-clamped (NPC) topology featuring a combination of active (transistor) and passive (diode) clamping. The topology leverages the main benefits of both purely-passive and purely-active NPC topologies. It allows concentrating switc...

A Novel Hybrid Active-Passive Neutral-Point-Clamped Multilevel Conversion Topology

This paper presents a novel multilevel neutral-point-clamped (NPC) topology featuring a combination of active (transistor) and passive (diode) clamping. The topology leverages the main benefits of both purely-passive and purely-active NPC topologies. It allows concentrating switc...

Overstrength factors for the strategic use of austenitic stainless steel in eccentrically braced frames

Among many other characteristics, stainless steel has been shown to have higher level of ductility and considerable strain hardening. These properties are very attractive for seismic structural designers. Considering these features, the interest to use stainless steel for dissipa...

Spectral Analysis of Block Diagonally Preconditioned Multiple Saddle‐Point Matrices With Inexact Schur Complements

ABSTRACT We derive eigenvalue bounds for symmetric block‐tridiagonal multiple saddle‐point systems preconditioned with block‐diagonal Schur complement matrices. This analysis applies to an arbitrary number of blocks and accounts for the case where the Schur complements are approx...

hp Analysis of Nitsche’s method for Maxwell’s problem using a stabilised finite element formulation

Abstract The paper presents an hp analysis of Nitsche’s method applied to Maxwell’s problem using a stabilised finite element (FE) formulation. While the FE formulation and the weak imposition of Dirichlet boundary conditions have been previously explored, the novelty of this wor...