97828 research outputs found
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Diseño de una propuesta para el desarrollo de la competencia digital docente en profesorado universitario. Una investigación basada en el diseño educativo.
No full textCompendi d'articles, Doctorat internacionalLa competencia digital docente (CDD) es un elemento clave para responder a las exigencias de un contexto universitario marcado profundamente por la digitalización. A pesar de esta relevancia los esfuerzos institucionales aún suelen ser insuficientes y poco conectados con la práctica docente real. Esta investigación tiene como objetivo el diseño y validación de una estrategia institucional para desarrollar la CDD. El estudio fue realizado en una universidad española, utilizando la metodología de investigación basada en el diseño educativo con un enfoque iterativo y participativo, integrando a diferentes grupos de interés. Las contribuciones de este trabajo incluyen una serie de recomendaciones para el desarrollo de la CDD, implementadas y validadas en el contexto real de una universidad. Destacan aspectos como la conexión de las estrategias institucionales con la práctica docente, la construcción del metalenguaje o el uso de marcos comunes, ofreciendo una serie de principios de diseño extrapolables a contextos similares.Digital teaching competence (DTC) is a key element in responding to the demands of a university context deeply marked by digitalisation. Despite its importance, institutional efforts are still often insufficient and poorly connected to actual teaching practice. This research aims to design and validate an institutional strategy for developing DTC. The study was conducted at a Spanish university, using educational design-based research methodology with an iterative and participatory approach, integrating different interest groups. The contributions of this work include a series of recommendations for the development of DTC, implemented and validated in the real context of a university. Highlights include aspects such as the connection between institutional strategies and teaching practice, the construction of metalanguage and the use of common frameworks, offering a series of design principles that can be extrapolated to similar contexts.Programa de Doctorat en Educaci
Crystallization of M2SiO4 (M = Ni, Co) olivine solid solutions from Na2CoxNi1-xSi4O10 (0.0 ≤ x ≤ 1.0) compositions
No full textThe crystallization of olivine solid solutions from Na2CoxNi1-xSi4O10 (0.0 ≤ x ≤ 1.0) compositions, synthesized via the chemical co-precipitation method, was studied. These materials enable a gradation of the green to blue coloration in both powdered and enamelled forms. The presence of additional crystalline phases alongside these olivine solid solutions at 1000 and 1200 °C does not decrease the intensity of the colour. This allows a reduction in the amount of Ni(II) and Co(II) in the compositions. The crystallization of olivine begins at 800 °C in a pink phase with 0.4 ≤ x ≤ 0.8 in compositions. Its spectra can be interpreted as the effect of combining the colour contributions of Ni(II) and Co(II) ions in octahedral sites. At 1000 and 1200 °C, compositions with x > 0.2 exhibit a blue colour, and an additional spectral band attributed to Co(II) ions in tetrahedral coordination is observed.We gratefully acknowledge the financial support provided by Spain's Agencia Estatal de Investigación. Ministerio de Ciencia e Innovación, PID2020-113558RB-C41, Principality of Asturias (IDE/2024/000742) and University of Salamanca (K257-463AC01).Funding for open access charge: CRUE-Universitat Jaume
Metodologia e arquitetura computacional para Gestão Sustentável do Relacionamento com o Cliente
No full textSustainable customer relationship management (SCRM) tries to align company strategy, business processes, and company information technologies to carry out a sustainable customer relationship management. However, despite the growing interest of companies in incorporating social and environmental aspects into their relationship with customers, and the increase in the number of sustainability-conscious customers seeking more sustainable lifestyles, research on SCRM is recent and limited.
This work contributes to the development of SCRM as it proposes a methodology and a computer architecture that guide the implementation of SCRM in a company during the whole project life-cycle. The methodology includes all the dimensions of sustainability in customer relationship management, and allows to align business strategy, business process, human resources. The computer architecture combines different information technologies and systems such as Business Intelligence, Big Data, or Online social networks.O Gerenciamento Sustentável de Relacionamento com o Cliente (SCRM) tenta alinhar a estratégia da empresa, os processos de negócios e as tecnologias de informação da empresa para realizar um gerenciamento sustentável do
relacionamento com o cliente. No entanto, apesar do crescente interesse das empresas em incorporar aspectos sociais e ambientais em seu relacionamento com os clientes, e do aumento do número de clientes preocupados com
a sustentabilidade que buscam estilos de vida mais sustentáveis, as pesquisas sobre SCRM são recentes e limitadas.
Este trabalho contribui para o desenvolvimento do SCRM, pois propõe uma metodologia e uma arquitetura computacional que orientam a implementação do SCRM em uma empresa durante todo o ciclo de vida do projeto.
A metodologia inclui todas as dimensões da sustentabilidade na gestão do relacionamento com o cliente e permite alinhar a estratégia de negócios, o processo de negócios, os recursos humanos. A arquitetura do computador
combina diferentes tecnologias e sistemas de informação, como Business Intelligence, Big Data ou redes sociais online
Amphiphilic systems based on ionic liquids derived from amino acids and related materials: applications as therapeutic agents and drug delivery vehicles
No full textDoctorat internacionalEsta Tesis Doctoral, enmarcada en Química Supramolecular, explora líquidos iónicos (ILs) y sistemas anfifílicos como agentes bioactivos y vehículos de fármacos. Se diseñaron ILs derivados de aminoácidos y pseudoaminoácidos, evaluando su síntesis, propiedades fisicoquímicas y bioactividad. Inicialmente se estudiaron 17 ILs imidazólicos con actividad antitumoral en diferentes líneas celulares, junto a sus mecanismos de acción mediante ensayos con membranas y microscopía confocal. Asimismo, se desarrollaron mezclas de esos ILs con metotrexato, que mostraron sinergia antitumoral y afinidad por ADN. También se sintetizaron 14 sales de amonio cuaternarias con actividad antimicrobiana y sinergia con antibióticos. La investigación incluyó sistemas poliméricos anfifílicos sensibles a estímulos redox y un sistema tripodal derivado de L-valina para encapsulación y liberación controlada de antioxidantes, con eficacia antitumoral y baja toxicidad. Los resultados, publicados en revistas internacionales, evidencian el potencial de los ILs como plataformas multifuncionales en aplicaciones farmacológicas y biomédicas.Programa de Doctorat en Química Sostenibl
Effect of compressor speed on heat pump performance with climate-friendly refrigerants
No full textThe sustainability of the Heating, Ventilation, and Air Conditioning (HVAC) system focuses on reducing energy consumption, improving efficiency, minimising environmental impact, and improving indoor air quality while maintaining comfort. Sustainable HVAC practices are critical in combating climate change and creating energy-efficient systems. A Variable Refrigerant Flow (VRF) is an HVAC technology that utilizes high-efficiency components of variable-speed compressors enabled by inverter technology. These compressors adjust cooling output to actual demand and contribute to the system's overall energy efficiency, unlike conventional systems that operate at full capacity and use more energy. Thus, VRFs are highly efficient, adaptable, and suitable for various building types. The current study compares climate-friendly refrigerants R1234yf and R515B under different compressor frequencies (35, 40, 45, and 50 Hz). The experiment was carried out under the secondary fluid inlet and outlet temperatures of (12 °C/6 °C in the case of glycol and 45 °C/50 °C in the case of water), respectively. While the degree of sub-cooling and superheat is maintained at 5 °C and 10 °C, respectively. R1234yf demonstrated the highest refrigerant mass flow rate under the tested frequency, increasing compressor power consumption. R515B presents the highest system COP over all tested compressor frequencies, which can be selected as a suitable, safe, and non-flammable alternative refrigerant in buildings
Exploring the dark side of engagement: hidden costs to job satisfaction and well-being
No full textThis thesis examines the less explored side of employee engagement, particularly how it relates to emotional labor, stress, and job satisfaction. While engagement is often seen as positive, the research shows that it can also have unintended negative effects on employee well-being. By investigating these connections in depth, the study sheds light on how emotional demands at work may influence the experience of engagement and its outcomes. The findings offer useful insights for both scholars and practitioners, highlighting the need for a more balanced approach when promoting engagement in the workplace. This research aims to open up new directions for understanding and managing engagement in a way that supports both performance and employee health.Programa de Doctorat en Economia i Empres
Análisis de los estándares de calidad en cirugía avanzada de cáncer de ovario. Evaluación de las complicaciones y su relación con la lactacidemia tras cirugía de citorreducción abdominal.
No full textCompendi d'articlesLa carcinomatosis peritoneal ha sido considerada durante muchos años un estadio terminal de una enfermedad neoplásica cuyo origen puede encontrarse en distintos órganos, siendo uno de los lugares de origen más frecuente la neoplasia de ovario. Con el desarrollo de la medicina y la investigación, se han desarrollado técnicas que han aumentado considerablemente la supervivencia de los pacientes afectos de esta patología, como es la cirugía de citorreducción acompañada o no de quimioterapia intraperitoneal intraoperatoria (HIPEC). Sin embargo, las técnicas desarrolladas, que se basan en cirugías muy complejas y agresivas, pueden provocar graves complicaciones. Por ello, uno de los objetivos propuestos en este trabajo ha sido identificar indicadores de calidad en cirugía de citorreducción y establecer límites de calidad aceptables (es decir, estándares) que permitan a los facultativos evaluar la calidad del tratamiento proporcionado considerando qué aspectos deberían mejorar. Este tipo de intervenciones requiere monitorización estrecha a lo largo de todo el período perioperatorio. En este contexto de cirugías largas y complejas, los requerimientos celulares metabólicos aumentan. Esta situación puede derivar en un desequilibrio entre el aporte y la demanda de oxígeno que conlleva a un estado de disoxia tisular que, a su vez, se asocia a un aumento en los niveles de lactato. Está demostrado que niveles elevados de lactacidemia predicen un aumento de la morbimortalidad perioperatoria. Así pues, otro de los objetivos propuestos fue investigar la relación entre los niveles de lactacidemia y las complicaciones postoperatorias en pacientes sometidos a cirugía de citorreducción. En relación a este objetivo, también ha sido objeto de investigación el análisis de parámetros intraoperatorios y su relación con los niveles de lactacidemia con el objetivo de disminuir las complicaciones perioperatorias y por lo tanto la morbimortalidad de los pacientes y seguir mejorando de esta manera su pronóstico.This doctoral thesis, presented as a compendium of scientific articles, addresses peritoneal carcinomatosis, traditionally considered a terminal stage of various malignancies, with ovarian cancer being one of its most frequent causes. The development of new therapeutic strategies, such as cytoreductive surgery with or without hyperthermic intraperitoneal chemotherapy (HIPEC), has significantly improved patient survival. However, these are highly complex and aggressive surgical procedures, associated with a high rate of complications. Such interventions require close monitoring throughout the perioperative period, as surgical stress and increased metabolic demands can lead to an imbalance between oxygen supply and demand. This condition correlates with elevated lactate levels, which have been shown to be predictive markers of perioperative morbidity and mortality. The main objective of this work is, on the one hand, to identify quality indicators in cytoreductive surgery and to define standards that allow for the evaluation and optimization of healthcare delivery. On the other hand, considering that elevated lactate levels have been associated with increased perioperative morbidity and mortality, the relationship between lactatemia and postoperative complications in patients undergoing this type of surgery is analyzed. In addition, the influence of various intraoperative parameters on lactatemia is examined in order to identify modifiable factors that may help reduce morbidity and mortality and improve clinical outcomes. This work represents the starting point of a research line focused on optimizing the perioperative management of patients with peritoneal carcinomatosis, with the ultimate goal of improving their prognosis and quality of life.Programa de Doctorat en Ciències Biomèdiques i Salu
La influencia del capital social y la proximidad sobre los resultados de innovación: una aplicación en la industria agroalimentaria de la Región de Coquimbo, Chile
No full textEste trabajo de tesis doctoral analiza las relaciones existentes entre las empresas de un territorio, Tras una revisión teórica y la determinación del objeto de estudio, se realizaron tres estudios empíricos para comprender la influencia del capital social y las dimensiones de la proximidad sobre la generación de resultados de innovación, además de la importancia de las Indicaciones Geográficas (IG). El estudio se realizó en el sector agroalimentario de la región de Coquimbo Chile y en el Cluster del Pisco en Chile. Los resultados evidencian que el capital social y la proximidad con una determinada configuración favorecen los resultados de innovación, además las principales dimensiones de las IG son respondidas por los investigadores latinoamericanos. El estudio aporta importantes orientaciones para la toma de decisiones para los managers y policy makers en la industria agroalimentaria y la promoción del territorio de un país en desarrollo.This doctoral thesis work analyzes the existing relationships between companies in a territory, after a theoretical review and the determination of the object of study, three empirical studies were conducted to understand the influence of social capital and the dimensions of proximity on the generation of innovation performance, as well as the importance of Geographical Indications (GI). The study was conducted in the agri-food sector of the Coquimbo region of Chile and in the Pisco Cluster in Chile. The results show that social capital and proximity to a given configuration favor innovation performance, in addition, the main dimensions of GIs are answered by Latin American researchers.The study provides important guidelines for decision making for managers and policy makers in the agri-food industry and the promotion of the territory of a developing country.Programa de Doctorat en Economia i Empres
Alloying Engineering of Defective Molybdenum Sulfide Basal Planes for Enhanced Borrowing Hydrogen Activity in the Thioetherification of Alcohols
No full textThe borrowing hydrogen thioetherification of alcohols over heterogeneous catalysts has emerged as an attractive and practical synthetic strategy to prepare thioethers from the perspective of green and sustainable chemistry. Developing efficient catalysts is the key to improve this carbon-sulfur (C−S) bond formation process. Herein, a novel catalyst, namely {Mo2.89W0.11S4}n, has been prepared by alloying engineering of its basal planes through an innovative synthetic methodology that makes use of isostructural building entities based on molybdenum and tungsten sulfide molecular complexes with M3S4 (M=Mo, W) cluster cores. Besides excellent activity and reusability, {Mo2.89W0.11S4}n is of broad scope, enabling the conversion of structurally diverse thiols and primary as well as secondary alcohols into thioethers. A set of characterizations, in combination with catalytic results, reveal that the catalytic activity of {Mo2.89W0.11S4}n for this relevant transformation arises from the presence of multiple-type active centers in the defective basal planes of this alloyed catalyst. More specifically, coordinatively unsaturated sulfurs and metal atoms with Lewis basic and Lewis acid properties, respectively, are proposed to be the active sites involved in the borrowing hydrogen mechanism
La terminologia de la cirurgia vascular en català
No full textL’article analitza 150 termes de cirurgia vascular en català, amb l’objectiu d’identificar i avaluar la disponibilitat de termes en les principals fonts de referència: Cercaterm (TERMCAT), Vocabulari de les ciències de la salut (AVL), Diccionari Enciclopèdic de Medicina (IEC) i Viquipèdia en català. També es vol determinar quines d’aquestes fonts són més ade quades per a la consulta de la terminologia específica en aquest àmbit. Els resultats mostren que Cercaterm és la més comple ta, amb un 83% de cobertura, tot i que sovint amb explicaci ons breus. El Diccionari Enciclopèdic de Medicina ofereix definicions més detallades, però té un cercador poc eficient i no està actualitzat segons la normativa. La Viquipèdia destaca per la presència d’epònims i pel context ampli que aporta. El Vocabulari de l’AVL només conté termes bàsics, però el format PDF n’agilitza la consulta. En conclusió, aquest estudi subratlla
la necessitat de disposar de fonts més completes i actualitzades en àmbits com la cirurgia vascular, amb l’objectiu de millorar i estandarditzar la comunicació en el context mèdic.The article analyses 150 vascular surgery terms in Catalan, aim-ing to identify and assess the availability of terms in key reference sources: Cercaterm (TERMCAT), Vocabulari de les ciències de la salut (AVL), Diccionari Enciclopèdic de Medicina(IEC), and the Catalan-language Wikipedia. It also seeks to determine which of these sources is most suitable for consulting specialised terminology in this field. The findings indicate that Cercaterm is the most comprehensive source, covering 83% of the analysed terms, though its explanations are often quite brief. The Diccionari Enciclopèdic de Medicina provides more de-tailed definitions and descriptions; however, its search function is inefficient, and the terms have not been updated to align with the latest Catalan orthographic standards. Wikipedia is notable for its extensive presence of eponyms and the breadth of content and context provided for each term. The Vocabulari de les ciències de la salut includes only basic terms, but its PDF format facilitates searching. In conclusion, this study underscores the need for more comprehensive and up-to-date resources in fields such as vascular surgery to improve and standardise communication within the medical context