idUS. Depósito de Investigación Universidad de Sevilla
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Cuaderno Cátedra RTVE-US. Conversaciones con Samuel Martín Mateos, director de La 2
No full textEste volumen inaugura la serie de Cuadernos de la Cátedra RTVE-US de Contenidos Culturales y Creatividad en el Sector Audiovisual y Digital, fruto de un convenio firmado entre Radio Televisión Española y la Universidad de Sevilla en junio de 2021. En octubre 2023 la Cátedra puso en funcionamiento un Seminario Permanente en el que profesores de distintas áreas de conocimiento conversan con profesionales del ente público para acercar su trabajo a los estudiantes de los títulos de Comunicación. Inaugura esta serie el diálogo mantenido entre Samuel Martín Mateos, director de La 2 durante casi una década, e Inmaculada Gordillo y Valerio Durán, profesores del Departamento de Comunicación Audiovisual y Publicidad de la Facultad de Comunicación de la Universidad de Sevilla, con quienes comparte sus más de cuarenta años de experiencia en RTVE
Teoría de grafos: una herramienta para pensar
No full textLa lección inaugural de Alberto Márquez Pérez, impartida en la Escuela Técnica Superior de Ingeniería de Edificación de la Universidad de Sevilla, gira en torno a la teoría de grafos como herramienta fundamental para el pensamiento en diversas disciplinas. El autor destaca que, a pesar de su simplicidad, los grafos son poderosos al permitir modelizar problemas reales de manera efectiva. Se presentan aplicaciones variadas de la teoría, subrayando su relevancia en la ingeniería de edificación. Un ejemplo motivador menciona cómo la transformación de un problema complejo en un contexto de teoría de grafos puede llevar a soluciones sorprendentes. La lección también hace hincapié en la importancia de mantener una conexión con la realidad y la humildad intelectual. A lo largo del documento, se enfatiza que la teoría de grafos va más allá de las matemáticas, siendo una herramienta valiosa en múltiples campos del conocimient
Lab-scale biocomposite manufacturing: Exploring rice bran-based bioplastics reinforced with natural fillers through extrusion and injection molding
No full textBioplastics from agro-food industry by-products offer a sustainable alternative to the environmental concerns linked to petroleum-derived plastics. Rice bran (RB), an abundant and low-cost by-product rich in protein and starch, is a promising feedstock but poses challenges due to its complex composition. This study investigates the integration of natural fillers (cellulose, flax, and hazelnut shell) into a RB-based matrix. At low filler content (2 wt.%), all fillers increased stiffness from 138 MPa to 190, 184 and 196 MPa for cellulose, flax and hazelnut shell, respectively. Higher contents (5–10 wt.%) showed varied effects: flax and cellulose improved Young's modulus only up to 5 wt.% due to agglomeration, while hazelnut shell had beneficial effects even at 10 wt.% even for tensile strength (improving from 2.5 to 3.4 MPa). Additionally, all fillers enhanced viscoelastic moduli and thermal stability, with hazelnut shells showing the most significant improvements, making them a promising additive for bioplastics
A predictive framework for last-mile delivery routes considering couriers’ behavior heterogeneity
No full textLast-mile route prediction is a powerful tool for freight delivery companies that can be essential in the development of new features such as arrival time prediction or accurate workload allocation. Existing methodologies propose prediction models that, on the one hand, require external information, such as traffic data or a prior division of work areas, and, on the other hand, assume courier homogeneity in the search for travel patterns. However, this assumption may introduce noise in the predictions since different couriers may be subject to different routing habits. This study proposes a comprehensive predictive framework for delivery routes, which allows identifying the routing profiles that best suit each courier and work area, and which starts from basic information available for any carrier, ensuring the scalability of the tool. The analysis is supported by a case study, where the results obtained bring to light the heterogeneity in the routing decisions of the different drivers and show that the proposed approach produces consistent and accurate predictions for the vast majority of them.Ministerio de Ciencia, Innovación y Universidades PID2021-125125OB-I0
Reconocimiento mutuo de las resoluciones de embargo y decomiso: de la Ley 23/2014 al Reglamento (UE) 2018/1805 ¿Y la ley de adaptación al Reglamento (UE) 2018/1805, para cuándo?
No full textThe first views of Malaga in the 16th century: graphic sources for research
No full textArchitecture and urban planning should contribute to urban progress by preserving the fragile values of inherited landscapes, integrating the old and the new. It is thus essential to investigate the transformations of each site has undergone, using graphic sources and checking their reliability. The case of the first views of Malaga in the 16th century is discussed here. Apart from reviewing symbolic representations of little documentary value, the views drawn by Anton van den Wyngaerde in 1564 and the one published in Civitates Orbis Terrarum in 1572 are analyzed; all of which provide exceptional testimonies of a landscape transformed through the centuries
Development and characterization of Fe2O3 nanoparticles doped with Al2O3 / TiO2 for green hydrogen production
No full textIron oxide is an inexpensive raw material capable of producing hydrogen based on the water-splitting reaction. However, the reaction is limited by the active surface area available on the particle. In this study, Fe2O3 nanoparticles doped with Al2O3 and TiO2 oxide (95 wt% Fe2O3 - X wt% Al2O3 - (5-X) wt% TiO2; X = 2, 2.5 and 3) were prepared by a double coprecipitation method to obtain a single solid solution. The synthesis of a solid solution resulted in particles with higher porosity. The use of Al resulted in the formation of pores of approximately 3 μm, which effectively prevented grain growth. Conversely, the substitution of Ti ions increased the oxygen mobility, resulting in a higher hydrogen consumption at temperatures below 700 °C, leading to a deeper reduction reaction. Indeed, the reactivity of the particle surface was strongly influenced by the Al/Ti atomic ratio, and the Fe3Al2Ti formulation seems to be the most promising due to its compositional and morphological design to create an oxide functional ceramic for H2 production
Effect of Doxycycline into Clay Minerals under UV light: An Approach of Antibacterial Activity
No full textAntibiotics are commonly used to treat bacterial infections. However, when these drugs are exposed to light, they can degrade and decrease their antibacterial activity. Here, a study aimed to produce hybrids with the antibiotic doxycycline (DTC) and clay minerals such as montmorillonite, palygorskite, and sepiolite as a strategy to maintain the drug's antibacterial activity against prolonged exposure to UV light. The materials were analyzed using X-ray diffraction, zeta potential, Fourier transform infrared spectroscopy, transmission electron microscopy, textural analysis by N2 adsorption/desorption, and thermogravimetric analysis. The materials were irradiated under 200 hours using UV light. The antibacterial action of the materials (irradiated and non-irradiated) was evaluated against Staphylococcus aureus and Escherichia coli strains. The antibacterial activity of the irradiated materials was better preserved than drugs without protection, especially against Gram-positive bacteria. Therefore, DTC/clay mineral hybrids can maintain the activity of light-sensitive antibiotics even after prolonged exposure to light, making them a promising option for healthcare applications
Dataset of Impact of an mHealth intervention on parents’ emotional health and on the neurodevelopment of high-risk infants
No full textWe assess the prenatal and postnatal effect of the High-Risk Pregnancy and Baby Parenting programme, which is complemented with two mHealth (app-based) resources. The GLM Repeated Measures Model technique was used to explore differences in the emotional health of the participants and in their infants’ neurodevelopment, comparing programme vs. usual care groups, composed of 150 and 195 participants, respectively. The mothers presented lower levels of depression (mean difference 1.74, p = .04, 95% CI .07, 3.40) and higher levels of resilience (mean difference 4.09, p = .004, 95% CI 1.40, 6.78). For the fathers, positive effects on resilience were recorded (p < .001). A positive treatment effect was perceived in the infants’ cognitive (p = .014), language (p < .001) and motor (p = .006) development. These findings suggest application of the programme can benefit maternal emotional health and infant neurodevelopment. M-Health technology could make this programme more accessible
