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GEOCommons: Geolocalització de la producció acadèmica de la UPC
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Article
Accés obert
DESI strong lens foundry. I. HST observations and modeling with GIGA-Lens
Institute of Physics (IOP)
2026-02-10
Huang, Xiaosheng
Baltasar Jiménez, Saul
Ratier Werbin, Nicolas
Storfer, Christopher J.
Sheu, William
Agarwal, Shrihan
Tamargo Arizmendi, Marcos
Schlegel, David J.
Ahlen, Steven
Pérez Ràfols, Ignasi
Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
Universitat Politècnica de Catalunya. Departament de Física
We present the Dark Energy Spectroscopic Instrument (DESI) Strong Lens Foundry. We discovered ~3500 new strong gravitational lens candidates in the DESI Legacy Imaging Surveys using residual neural networks (ResNet). We observed a subset (51) of our candidates using the Hubble Space Telescope (HST). Except for one ambiguous case, we have confirmed 50 of the 51 candidates to be strong lenses. We also briefly describe spectroscopic follow-up observations by DESI and Keck NIRES programs. From this very rich data set, a number of studies will be carried out, including evaluating the quality of the ResNet search candidates and lens modeling. In this paper, we present our initial effort in these directions. In particular, as a demonstration, we present the lens model for DESI-165.4754-06.0423, with imaging data from HST, and lens and source redshifts from DESI and Keck NIRES, respectively. In this effort, we have applied a fully forward-modeling Bayesian approach (GIGA-Lens), using multiple GPUs, to a strong lens with HST data, and achieved statistical convergence.
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Article
Accés obert
Bone adhesive with temporally-synchronized degradation for enhanced osteointegration
Springer
2026-04-07
Gu, JunTing
Li, ZhiTing
Wang, Yuzhu
Hao, Dongxiao
Dang, Gaopeng
Cao, XiaoQing
Tay, Franklin
Chen, JiHua
Aparicio Bádenas, Conrado José
Jiao, Kai
Niu, Lina
Universitat Politècnica de Catalunya. ABM - Advanced Biomaterials
Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials
Bone adhesives have emerged as promising alternatives for complex fracture fixation. However, discrepancies between material degradation rates and the physiological timeline of bone healing remain a critical limitation. Here, a polyurethane-based adhesive (TNC) was developed, synthesized from trimeric hexamethylene diisocyanate, nano-hydroxyapatite, and type I collagen. The TNC demonstrates strong initial adhesion to both wet and blood-contaminated bone surfaces and exhibits excellent biocompatibility. A distinguishing feature of TNC is its capacity to synchronize degradation with the stages of bone healing. During degradation, TNC forms a mineralized surface layer that releases calcium ions. The calcium ions activate cathepsin K, an enzyme integral to bone remodeling. This calcium-mediated mechanism accelerates TNC degradation by 1.9-fold during the remodeling phase compared to the initial phase. In a rat skull fracture model, TNC supported effective fracture stabilization and achieved favorable bone regeneration at 8 weeks after implantation. These findings demonstrate that TNC combines early mechanical stability with phase-specific degradability to facilitate bone regeneration in a temporally-controlled manner. The present work provides a framework for the development of bio-responsive bone adhesives that synchronize degradation behavior with healing phases for orthopedic applications.
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Article
Accés restringit per política de l'editorial
Effect of electrolytic cleaning on mechanical properties for titanium dental implants with surface contamination
Quintessence
2025-06
Fernandes Pinto da Fonseca, Dárcio Luís
Pons Calabuig, Ramon
de Tapia, Beatriz
Monje, Alberto
Nart Molina, José
Aparicio Bádenas, Conrado José
Gil Mur, Francisco Javier
Universitat Politècnica de Catalunya. ABM - Advanced Biomaterials
Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials
Introduction. Recently, galvanic cleaning techniques, such as Galvosurge®, which utilize hydrogen formation, have demonstrated significant efficacy in removing biofilm during the decontamination of implant surfaces in the reconstructive therapy of peri-implantitis. This decontamination method avoids the mechanization of the implant and therefore avoids the loss of mechanical properties, loss of good corrosion behavior and avoids the release of particles of different sizes with possible toxic effects. However, the formation of hydrogen on the surface could cause diffusion into the titanium and lead to hydrogen embrittlement of the dental implant. Purpose. In this study we intend to study the effect of this treatment on the mechanical properties of dental implants. Materials and methods. Ninety dental implants were studied, of which 30 were control, 30 were treated with Galvosurge® and 30 were treated with concentrated hypochlorous acid. The amount of hydrogen in the titanium interior was determined for each of the samples by spectroscopy to elemental analysis of hydrogen TCH600 LECO. Fatigue tests were performed using a servohydraulic machine determining the S-N curves by performing triaxial tests (tension-compression and 5 ° torsion) at different loads to simulate human mastication. A study of the fractures of the dental implants was carried out by scanning electron microscopy and the samples were observed by transmission electron microscopy to observe the possible appearance of hydrides in the titanium microstructure. Results. The results showed that the electrolytic technique reduces the presence of hydrogen in the dental implant and the acid treatment increases it causing the presence of hydrides at the grain boundaries of the titanium. Fatigue tests show that dental implants treated with Galvosurge® have a longer fatigue life than the control due to the lower hydrogen content. It was shown that the increase of hydrogen in the acid-treated implants reduces the fatigue life of the dental implant. Conclusions. This study allows us to conclude that the formation of hydrogen by electrolysis does not cause a diffusion of this element to the titanium but on the contrary reduces the level of hydrogen which favors its mechanical properties in the long term.
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Article
Embargat per política de l'editorial (2028-08-01)
Optimization and analysis of nanosecond double-pulse laser texturing in metastable austenitic stainless steel
Elsevier
2026-08-01
Rezayat, Mohammad
Karamimoghadam, Mojtaba
Morvayová, Alexandra
Contuzzi, Nicola
Javidani, Mousa
Casalino, Giuseppe
Mateo García, Antonio Manuel
Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials
Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials
This study investigates the influence of nanosecond double-pulse laser surface rillng (LST) on AISI 301LN stainless steel using a systematic design of experiments (DOE). Laser power and pulse configuration were varied to evaluate their effects on surface morphology, including depth-to-width ratio of the laser tracks, spatter formation, and surface roughness. The texturing process was performed using a Nd:YLF laser at 1047 nm, and surface features were characterized using SEM, 3D reconstruction, and profilometry. Analysis of variance (ANOVA) and regression modeling revealed that both laser power and pulse type exerted statistically significant impacts on surface characteristics, with higher pulse numbers leading to deeper and rougher textures. Numerical analysis demonstrates that laser surface texturing of AISI 301LN stainless steel is dominated by transient melting and recoil-pressure-induced material ejection. Increasing pulse number leads to heat accumulation, deeper melt pools, and enhanced cavity formation, consistent with experimental observations. Quantitative agreement between simulated and measured cavity depths supports the validity of the proposed ablation mechanisms. The results provide critical insights for optimizing laser processing of metastable austenitic stainless steels in industrial applications.
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Tesi
Accés obert
Impacts of climate change on the ports of the Southwestern coast of the Alboran Sea
Universitat Politècnica de Catalunya
2026-04-15
Jebbad, Raghda
Mösso Aranda, César
Sierra Pedrico, Juan Pablo
Escola Tècnica Superior d'Enginyeria de Camins, Canals i Ports de Barcelona
(English) Climate change is altering the coastal conditions that ports are designed to withstand, through sea-level rise and changes in storm-driven wave regimes. These changes can reduce operability, increase overtopping impacts on exposed structures, and affect harbour agitation and breakwater performance. This thesis develops an applied and integrated framework to translate offshore climate projections into port‑scale impact indicators and adaptation pathway planning for Moroccan Mediterranean ports along the southwestern Alboran Sea.
Offshore wave conditions are characterised using a four‑dataset Med-CORDEX ensemble under RCP4.5 and RCP8.5, and propagated to the nearshore with a regional SWAN model featuring port‑scale nesting. Combined with sea level rise projections, these forcings are used to quantify four port‑impact indicators: berthing inoperability based on still‑water‑level exceedance relative to minimum freeboard requirements; wave overtopping discharge at exposed structures; harbour agitation exceedance within the basin; and breakwater stability under extreme forcing. The overtopping assessment is applied across eight ports to establish relative exposure and identify the most exposed sites. Berthing inoperability and an indicative dock‑raising cost estimate are developed for Tangier‑Med. A multi‑process assessment is carried out for Al Hoceima, together with an applied adaptation‑pathways case study that links impact levels to response options over time. The thesis also develops an uncertainty‑evaluation framework to support the interpretation of wave‑driven port impact projections.
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