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El Repositorio Institucional de la Universidad FinisTerrae, es gestionado por el Sistema de Bibliotecas y tiene por objetivo permitir el acceso libre a la producción académica e institucional de la Universidad, aumentando la visibilidad de sus contenidos y garantizando su conservación.
Envíos recientes
Beyond bloch: A teotherical blueprint of conjugated polymer optoelectronics
(IOP Publishing, 2026-03-31) Lagos, Miguel; Kiwi, Miguel; Paredes, Rodrigo
Conjugated polymers have recently regained strong interest because of their potential in organic electronic devices such as organic light-emitting diodes (OLEDs), field-effect transistors (FETs), and organic photovoltaics (OPVs). Unlike inorganic semiconductors where electrons are commonly treated as delocalized or quasi-free Bloch states,electrons in conjugated polymers occupy strongly coupled, localized σ and π orbitals and interact intensely with the ionic lattice. These materials therefore deviate markedly from the assumptions underlying Bloch-based approaches, motivating the development of alternative theoretical descriptions of charge transport. Here we present a many-body model that explicitly includes electron-electron interactions, both on-site and between π states on alternating chain sites. The model naturally explains semiconducting behavior in the undoped polymer and predicts two novel flat bands of excited bonding states. These excited states exhibit bosonic character and enable an unconventional charge-transport channel. The model also quantitatively reproduces experimental observations, yielding excellent fits to measured UV-Vis absorption and electro-luminescence spectra.
Touching the invisible: learning electromagnetism in virtual worlds
(Emeral Publishing, 2026-04-10) Bopp Ibar, María-Jesús; Mora Serrano, Francisco Javier; Proboste M., Mahias; del Arco, Albert; Cervera, Miguel; Muñoz La Rivera, Felipe
Purpose – Engineering education, particularly in complex fields like electromagnetism, faces a significant challenge in conveying multiphysics systems. Traditional methods fall short in building deep, intuitive understanding. The purpose of this paper is to address this “cognitive interface challenge” by presenting a novel conceptual framework for creating human-centric, interactive learning environments to bridge this gap. Design/methodology/approach – This paper details a methodology of interdisciplinary knowledge transfer. The proposed conceptual framework is derived from a multi-year analysis of best practices in the Architecture, Engineering, Construction and Operations sector, which has already developed mature solutions for navigating complex three-dimensional digital twins. Findings – The primary contribution is a formal four-stage methodological framework for developing human-centric virtual environments. This model moves beyond traditional tools to create interactive systems based on defined cognitive goals and proven interactive design paradigms, providing a new, robust method for the computation and mathematics community. Research limitations/implications – As a conceptual paper, the primary implication is the need for empirical validation of the proposed four-stage framework. Future research should focus on implementing and testing the framework’s effectiveness against traditional methods in controlled educational and professional settings.
Intelligent Grid Support with VPPs: A Scalable Solution for PMGD Integration Challenges
(IEEE Xplore, 2026-04-20) Córdova, Felisa; Yanine, Fernando; de Saint Pierre, Thierry; Rother, Hans; Aly, Mokhtar
Power quality issues and blackouts in electric distribution systems, such as the recent outage affecting Spain and parts of Portugal, are increasingly linked to grid imbalances caused by the growing penetration of Distributed Generation (DG), particularly medium-sized photovoltaic plants (PMGD). These systems inject all their power into the grid, often causing disturbances in the grid's power supply. They also require constant coordination with nonrenewable backup plants, leading to instability in frequency and voltage. To address these challenges, Virtual Power Plants (VPPs) offer a scalable and rapidly deployable solution, integrating large-scale energy storage, advanced diagnostics, and real-time control to provide ancillary services, stabilize supply, and reduce the burden on traditional infrastructure. There is also a need to rapidly diagnose the grid's disturbances and readily intervene to remediate the condition. In this paper, the need for VPP in renewable energy-rich power grids is discussed. A solution termed SiVUr is introduced, which helps diagnose and then intervene the grid with VPP, employing Artificial Intelligence (AI) to optimize the VPP's effectiveness in mitigating disturbances. This solution creates dynamic interactions between DERs and loads, which is crucial for modern power grids. As PMGD integration accelerates, it becomes essential to maintain the grid's reliability, flexibility, and service quality in increasingly complex and decentralized energy environments.
Para el arte no, para la historia sí: Benjamín Vicuña Mackenna y las copias de obras de arte en la Exposición del Coloniaje (1873)
(Universidad de Valparaíso, 2023-08-19) Alegría, Luis; Acevedo, Pía
La “Exposición del Coloniaje” es una exhibición de objetos históricos que abarcan una diversidad de tipologías, desde pinturas, carruajes, muebles, armas, trajes, documentos, entre otros, que abarcan desde los pueblos indígenas hasta los primeros años de la República. Por ello, es una de las iniciativas patrimoniales más relevantes del siglo XIX en Chile. Fue inaugurada un 17 de septiembre de 1873, y su gran gestor fue el intendente de Santiago y también historiador Benjamín Vicuña Mackenna (1830-1886). El presente texto resalta, dos aspectos de dicha exposición, por un lado, su condición de bisagra en la configuración del campo patrimonial y cultural del país, atribuyendo relevancia a las copias de las obras de arte, como dispositivos históricos y didácticos, como un tipo de práctica patrimonial, muy extendido por la necesidad de recrear ese pasado colonial, y, por otro lado, al producir un quiebre simbólico con las formas de ese pasado colonial que es necesario superar.
Extracorporeal membrane oxygenation in pediatric septic shock: A single-center experience in Chile
(SAGE Publications, 2026-01) Godoy, Loreto; Yunge, Mauricio; Rufs, Jorge; Gatica, Alejandra; Muñoz, Carlos; Valverde, Cristian
Background: Refractory septic shock (RSS) in children carries high mortality despite advances in critical care. Extracorporeal membrane oxygenation (ECMO) is a rescue therapy when conventional management fails. Evidence from Latin America remains limited, with no detailed reports from Chile.
Methods: We conducted a retrospective single-center study (2009–2024) in a Chilean Pediatric ICU. Patients aged 1 month to 17 years with septic shock unresponsive to maximal conventional therapy were included. We analyzed demographics, illness severity, ECMO modality, complications, and outcomes. Primary endpoint was survival to hospital discharge.
Results: Nine patients received ECMO (median age=6.3 years). All had RSS, frequently associated with severe ARDS. Configurations included venoarterial (VA; n=4), venovenous (VV; n=4), and venoarteriovenous (VAV; n=1), all via peripheral cannulation. Pre-ECMO median vasoactive-inotropic score was 117, and 78% required renal replacement therapy during ECMO. Overall survival was 55% (5/9). Survivors had longer ECMO runs (median 11 days vs 3 days) and ICU stays (median 63 days vs 5 days). Hemorrhage was the most frequent complication (intracranial n=3; gastrointestinal n=1). One survivor developed hemiparesis; no cognitive impairment was observed at 1-year follow-up.
Conclusions: ECMO can be an effective rescue therapy for pediatric RSS, even without central cannulation capability. Distinguishing cardiogenic from vasoplegic phenotypes and identifying severe ARDS guided configuration selection (VA vs VV). These findings highlight the feasibility of peripheral ECMO in carefully selected patients within resource-limited settings, achieving survival comparable to international reports.