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Are 15-minute cities for children? Exploring the socio-economic factors in Madrid
Get PDFThe emergence of 15-minute cities marks a pivotal shift in urban planning, prioritizing accessible amenities within walking distance. This study examines its application in Madrid, Spain, with a focus on children. Firstly, an algorithm is developed to delineate the maximum walkable area around each census tract. Secondly, services that are essential for children aged 6–16 within a k-minute walking time are identified, along with the census tracts in which such access is available. Finally, a spatial probit model uncovers factors affecting accessibility, revealing correlations with income level, population density, gender, and family structure. These findings offer valuable insights for policymakers and urban planners aiming to create more equitable and liveable urban environments.This work has been partially funded by the Spanish Ministry of Science and Innovation, Grant PID2022-136252NB-I00
Exploring the impact of Big Data on business relationships and sustainability: The moderating role of absorptive capacity in manufacturing firms
Get PDFPurpose
This study investigates how big data (BD), conceptualized through the five Vs (volume, variety, velocity, veracity and value), influences business relationships (BR) and sustainable performance (SP) in Mexican manufacturing firms and how absorptive capacity (AC) shapes these effects.
Design/methodology/approach
Survey data from 304 manufacturing firms were analyzed using partial least squares structural equation modeling (PLS-SEM).
Findings
BD enhances BR and SP. BR positively affects SP, and AC acts as a critical dynamic capability that amplifies the impact of BD. Firms with strong AC derive superior strategic, relational and sustainability benefits from BD, while those with weak AC gain less advantages.
Research limitations/implications
The study focuses on a single-country context and the 5Vs framework. Future studies should test the model across industries and economies and consider additional moderators such as digital organizational culture or institutional pressures.
Practical implications
Policymakers and business leaders should prioritize BD adoption and invest in AC development. This will enhance collaboration and enable data-driven strategies that support environmental and social goals in manufacturing. Grounded in the knowledge-based view and business ecosystem theory, the study advances theory showing that BD becomes a strategic knowledge asset when firms possess AC. AC enables the acquisition, assimilation, transformation and exploitation of BD, turning raw data into knowledge that fosters collaboration and sustainability. This highlights the co-evolution of digital and learning capabilities as drivers of sustainable competitiveness.
Originality/value
This study contributes to the knowledge-based view and business ecosystem Theory by integrating digital and relational capabilities into a framework for sustainable performance. It offers empirical evidence from an emerging economy, providing insights relevant for both researchers and practitioners in digital transformation and sustainability
Art and architecture at the Cartagena casino
Get PDF[SPA] El Casino de Cartagena es uno de los espacios de reunión más importantes de la burguesía de finales del siglo XIX y principios del siglo XX. Como ha pasado con todos los casinos u círculos culturales de esa época, se han tenido que ir adaptando a las distintas épocas en las que han sobrevivido, siendo el de Cartagena, hoy día todavía uno de esos espacios sociales activos. Se trata de uno de los edificios burgueses mejor conservados de la Región de Murcia, gracias a la inversión privada que lo conserva, con algunos de los espacios modernistas más interesantes de la ciudad. Las principales obras de reforma del edificio se realizaron entre las últimas décadas del siglo XIX y las primeras del XX. En las obras no se escatimó en engalanar el edificio con los mejores materiales y técnicas constructivas de la época. Así, participaron en las obras importantes artesanos, artistas e industriales de la época que dejaron su notable impronta en este edificio. En el proyecto de rehabilitación integral que realizaron los arquitectos que firman este artículo, se realizó una intensa investigación que se plasmará en esta comunicación, descubriendo las principales salas que se conservan del edificio y los valores patrimoniales que conservan, tanto artesanos como industriales.
[ENG] The Casino of Cartagena is one of the most important meeting places for the bourgeoisie of the late 19th and early 20th centuries. As with all casinos and cultural circles of that era, they have had to adapt to the different periods in which they have survived, and the Casino of Cartagena is still one of those active social spaces today. It is one of the best-preserved bourgeois buildings in the Region of Murcia, thanks to the private investment that preserves it, with some of the most interesting modernist spaces in the city. The main renovation work on the building took place between the last decades of the 19th century and the first decades of the 20th century. No expense was spared in the work, embellishing the building with the finest materials and construction techniques of the time. Thus, important artisans, artists, and industrialists of the time participated in the projects, leaving their notable mark on this building. In the comprehensive renovation project carried out by the architects who wrote this article, extensive research was conducted, which will be reflected in this article, revealing the main rooms of the building that remain and the heritage values they retain, both artisanal and industrial
Concurrent dual-band (2.4 and 5 GHz) WiFi identification and monopulse localization system
Get PDFLa necesidad de contar personas en entornos físicos de forma precisa, no invasiva y económicamente viable ha impulsado la búsqueda de soluciones basadas en tecnologías de radiofrecuencia (RF). Los sistemas tradicionales presentan limitaciones importantes: los sensores infrarrojos bidireccionales requieren estructuras físicas específicas y mantenimiento frecuente; las alfombras cuenta-personas pierden precisión ante flujos elevados y se deterioran en exteriores; los sistemas de visión ofrecen mayor exactitud, pero su coste de adquisición e instalación es elevado; y las cámaras 3D, aunque más potentes, implican un coste operativo aún mayor. Ante este panorama, se plantea el desarrollo de un sistema de conteo basado en tecnologías RF, concretamente WiFi. Esta tecnología, además de su uso como medio de comunicación, ha demostrado ser útil en aplicaciones de localización de dispositivos del Internet de las cosas. Entre los métodos de localización disponibles, el enfoque basado en fingerprinting es común, aunque presenta desventajas como la necesidad de una calibración intensiva y su sensibilidad a interferencias y cambios en el entorno, lo que afecta negativamente a su precisión. Es por ello que en los últimos años ha ganado relevancia la técnica de localización angular basada en la función monopulso de amplitud, utilizando la potencia RSSI (Receiver Signal Strength Indicator) de las tramas WiFi. Esta técnica se basa en el uso de dos antenas directivas orientadas en distintas direcciones, cuya señal recibida se compara para estimar el ángulo de llegada del dispositivo. Mediante una caracterización previa del sistema se realiza en cámara anecoica, se puede establecer una relación entre la diferencia de potencia y el ángulo de llegada, tal y como explicaremos en capítulos anteriores.Escuela Técnica Superior de Ingeniería de TelecomunicaciónUniversidad Politécnica de Cartagen
Combined Use of Biostimulation and Deficit Irrigation Improved the Fruit Quality in Table Grape
Get PDFThis study aims to determine the effects of four different biostimulation treatments—composed of microorganisms, seaweed, and plant extracts—on the yield and quality traits of table grapes. Those treatments are compared with an untreated control treatment and tested under two different irrigation schedules: (i) Farmer Irrigation (FI), according to farmer criteria, and (ii) a deficit irrigation program, Precision Irrigation (PI), irrigated as FI, except during the post-veraison period when a 10% soil water depletion was allowed to mitigate the lixiviation. The water inputs in the treatments under PI were reduced by 30% without affecting the total yield but still promoting harvest precocity—an effect that was enhanced by the biostimulated treatments. This deficit irrigation program also stimulated berry growth and a higher maturity index. The different biostimulation treatments led to an improvement in the physical and chemical quality traits of the grapes; under FI, they showed a bigger size and a greater weight than the non-biostimulated treatment, while under PI, they showed a higher soluble sugar concentration and maturity index. Regardless of the irrigation program, the commercial berry color proportion was increased in all the biostimulated treatments, reducing the percentage of green berries. The combined use of biostimulation and PI can promote more efficient and sustainable farming practices, promoting fruit yield precocity and quality of the grapevine in drought-prone regions.This work is a result of the AGROALNEXT program and was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and by Fundación Séneca with funding from Comunidad Autónoma Región de Murcia (CARM). Funding has also been received from the FMC Agricultural Sciences chair of the UPCT, an agreement between FMC Agricultural Solutions and UPCT
Simulation as a Service in Data Spaces: A Digital Twin‑based Approach
Get PDFThe integration of Digital Twins with Data Spaces represents a significant opportunity for developing new value-added services across various domains. While both technologies are well-established individually, a comprehensive analysis of their integration potential and practical implementation guidelines remains necessary to unlock innovative service deployment scenarios. This paper addresses this gap by providing a thorough examination of available technologies, comparing Digital Twin frameworks and Data Space connectors, alongside detailed implementation guidance for service deployment. Technical specifications for connector implementation, data standardization, and policy enforcement are thoroughly detailed, offering valuable insights for industry practitioners. Through this analysis, we demonstrate how to leverage these technologies to enable real-time grid simulation as a service—a capability not yet available in current Data Space ecosystems. Our approach, built on the FIWARE platform, ensures interoperability through standardized data models and common vocabularies, providing a blueprint for practitioners to expose simulation services within Data Spaces. The framework’s effectiveness was validated in the energy domain, using the real-world infrastructure of the University of Murcia campus (Spain), where we successfully conducted Energy Demand Response assessment without compromising grid operations. This implementation, combined with our comprehensive technical guidelines and practical insights, establishes a clear pathway for operators to deploy simulation services within Data Spaces, fostering innovation across different infrastructure management scenarios.This work received funding from the European Union’s Horizon CL3 Increased Cybersecurity 2021 under grant agreement number 101069471 (CERTIFY - aCtive sEcurity foR connecTed devIces liFecYcle), from the Swiss State Secretariat for Education, Research and Innovation (SERI) under grant agreement numbers 22.00165 and 22.00191 and from the European Commission under the Horizon Europe Project MASTERPIECE (GA: 101096836
Frequency-Scanning Waveguide Antenna for Solar Radio Bursts Detection in the UHF Band
Get PDFThis paper proposes a frequency-scanning antenna designed to operate in the 400 MHz to 800 MHz band for solar radio astronomy applications. It is constructed with perforated metallic walls and cylinders, that form a rectangular leaky waveguide. By adjusting the metallic cylinders in the appropriate subwavelength holes, the scanning angle of the directive beams and directivity can be effectively controlled while assuring high radiation efficiency and gain. Unlike previous leaky waveguides, the proposed design allows manual tuning of both the leaky-mode phase and the leakage factors. A 2-meter-long antenna prototype has been fabricated, and the measurement results show an angular scanning range from 70° to 30° above the horizon, with a peak gain of 14 dBi and radiation efficiency exceeding 70% over the entire scanning band. The application of this antenna to detect solar radio bursts without the need for Sun tracking is demonstrated.This work was supported in part by the European Union through the CELESTINA—SPARC Projects in collaboration with Parque Científico y Tecnológico de Castilla-La Mancha and the Universities of Alcalá, Murcia, under Grant SBPLY/19/180501/000237 and Grant SBPLY/23/180225/000071; in part by the Spanish Projects under Grant PID2019-104863RB-I00 and Grant PID2022-136590OB-C42; and in part by Regional Fundacion Seneca Project 22076/PI/22
Social spaces in the Region of Murcia for the construction of a town. From casinos to agricultural societies
Get PDF[SPA] Desde la Asociación de Cronistas Oficiales de la Región de Murcia, proponemos en este trabajo y con la aportación de varios Cronistas del territorio, un muestreo sobre espacios sociales desde varias aplicaciones o enfoques según la particular finalidad u objetivos de las Asociaciones aquí conjugadas. De esta forma, Librilla, Totana, Moratalla, Las Torres de Cotillas, Albudeite, Campos del Río, Ojós, Villanueva del Río Segura, así como las pedanías murcianas de Torreagüera y Javalí Nuevo, serán algunas de las localidades que nos mostrarán, a través de diversos espacios económicos, culturales y sociales, propuestas de unión, relación, integración, formación y ocio, mostrando la importancia habida desde los Casinos a las Sociedades Agrarias, como formas representativas de la construcción de un pueblo.
[ENG] From the Association of Official Chroniclers of the Region of Murcia, we propose in this work, and with the contribution of several Chroniclers of th territory, a sampling of social spaces from various applications or approaches according to the particular purpose or objetives of the Associations united here. In this way, Librilla, Totana, Moratalla, La Unión, Las Torres de Cotillas, Albudeite, Campos del Río, Ojós, Villanueva del Río Segura, as well as the Murcian districts of Torreagüera and Javalí Nuevo, will be some of the towns that will show us, through various economic, cultural and social spaces, propasals for union, relationship, integration, training and leisure, demostrating the importance of everything from the Casinos to the Agrarian Societies as representative forms of the construction of a town
Applying SDN techniques to reduce the granularity of CIDR addressing
Get PDFEn el contexto actual de las redes de comunicaciones, la gestión eficiente de los recursos y la segmentación de la red se han convertido en aspectos fundamentales para garantizar la seguridad, el rendimiento y la escalabilidad de los sistemas. La creciente demanda de servicios digitales, unida a la necesidad de garantizar un tráfico más controlado y adaptable, ha impulsado la aparición de nuevos paradigmas en el ámbito de las telecomunicaciones. Entre ellos destacan las redes definidas por software (SDN, Software Defined Networking), que permiten implementar políticas de control flexibles, separando el plano de control del plano de datos y facilitando la administración centralizada. Gracias a este enfoque, resulta posible diseñar redes dinámicas y programables que se adaptan a los requisitos de cada aplicación o entorno de ejecución. El presente Trabajo Fin de Grado se centra en la implementación de un controlador SDN basado en POX, una de las plataformas de desarrollo más empleadas para prototipos de este tipo. El objetivo principal es gestionar reglas de acceso en una topología virtualizada que utiliza el paradigma de segmentación por subredes, permitiendo definir políticas de comunicación más finas que las que ofrece el direccionamiento tradicional basado en CIDR. El controlador actúa como entidad central que define y aplica reglas de reenvío y filtrado entre distintos rangos de direcciones IP.Escuela Técnica Superior de Ingeniería de TelecomunicaciónUniversidad Politécnica de Cartagen
Evaluation of the possible impact of slurry from storage ponds to the subsurface using quantification and diagnosis methodologies for pollution prevention in the Mar Menor environment
Get PDF[SPA] En la Región de Murcia, la expansión de la ganadería intensiva en las últimas dos décadas ha generado importantes retos ambientales, especialmente en lo que respecta a la gestión de los residuos ganaderos. Entre ellos, el purín de cerdo destaca por su alto contenido en nutrientes y sales, lo que puede representar un riesgo significativo para el suelo y los acuíferos cuando no se almacena de forma adecuada. El Mar Menor, una laguna costera del sureste peninsular, ha sufrido un deterioro ambiental progresivo. Diversos estudios han relacionado este proceso con el aporte de compuestos nitrogenados y fosforados procedentes de actividades agrícolas y ganaderas desarrolladas en su cuenca vertiente. Una de las vías potenciales de entrada de nitratos al subsuelo es la infiltración de lixiviados desde las balsas de purines. Frente a esta problemática, se han aprobado normativas como el Real Decreto 306/2020 y la Ley 5/2021, que establecen medidas más estrictas para el almacenamiento, trazabilidad y aplicación de purines en zonas vulnerables. Sin embargo, aún persisten dudas sobre el comportamiento de estos lixiviados en el subsuelo, así como sobre la influencia de factores como la litología o las características constructivas de las balsas en su movilidad. Esta tesis plantea una metodología integrada que combina tomografía eléctrica en 2D, 3D y 4D, análisis geoquímicos de suelos, perforaciones estratigráficas y ensayos de permeabilidad. El objetivo es identificar zonas potencialmente afectadas por infiltraciones y analizar cómo la composición del terreno condiciona la movilidad o retención de los contaminantes. La correlación entre los datos geofísicos y geoquímicos permite validar las anomalías detectadas y mejorar la interpretación de su origen. El estudio se llevó a cabo en cinco explotaciones porcinas del municipio de Fuente Álamo, seleccionadas por su diversidad litológica y su ubicación dentro de la cuenca del Mar Menor. En varias de ellas se identificaron zonas con baja resistividad y concentraciones elevadas de nitratos y cloruros en profundidad, lo que sugiere la existencia de procesos activos de infiltración. A partir de estos resultados, se desarrolló un procedimiento práctico y se generaron mapas de riesgo en entorno SIG. Aunque el estudio se centra en el Mar Menor, la metodología propuesta puede aplicarse en otras regiones con presiones ganaderas y condiciones hidrogeológicas similares.[ENG] Over the past two decades, pig farming has expanded rapidly in the Region of Murcia, increasing the pressure on local environmental systems. Among the main concerns is the management of pig slurry, a waste product rich in nutrients and salts that, when poorly stored, can contaminate both soil and groundwater. The Mar Menor, a coastal lagoon in southeastern Spain, has shown visible signs of ecological degradation. Several studies point to agricultural and livestock practices in the surrounding basin as contributing factors. One potential source of impact is the infiltration of slurry-derived leachates into the subsurface, which may facilitate the movement of nitrates toward shallow aquifers. To improve the understanding of these processes, this thesis applies a multidisciplinary methodology that combines geophysical, geochemical, and hydrological tools. Specifically, it integrates electrical resistivity tomography (2D, 3D, and 4D), soil chemical analysis, stratigraphic drilling, and permeability testing to identify areas affected by infiltration and assess how soil composition influences contaminant transport and retention. The fieldwork was carried out at five pig farms in the municipality of Fuente Álamo, selected for their geological diversity and location within the Mar Menor catchment. Results revealed zones of low resistivity associated with high nitrate and chloride concentrations at depth, patterns that indicate possible leachate migration from storage ponds. These findings supported the design of an operational protocol for slurry impact assessment, and the generation of GIS-based risk maps for more effective environmental planning. Although the study focuses on the Mar Menor, the methodology can be applied to other regions with similar hydrogeological and agricultural conditions. By linking physical signals with chemical evidence, this work contributes to more informed decision-making in the management of livestock waste and the protection of vulnerable water resources.Esta tesis doctoral ha contado con el apoyo de la Fundación Séneca en el marco del subprograma regional de formación de personal investigador en universidades y organismos públicos de investigación de la Región de Murcia, en los ámbitos académico y de interés para la industria [número de subvención 21583/FPI/21].Escuela Internacional de DoctoradoUniversidad Politécnica de CartagenaTecnología y Modelización en Ingeniería Civil, Minera y Ambienta