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Catalytic nitrate reduction using a Pd-Cu catalysts supported on carbon materials with different porous structure
No full textThe properties of the materials used as catalysts significantly affect their performance in catalytic NO3- reduction with hydrogen in polluted drinking water. Most studies have focused on how the active phase influences reaction selectivity and minimizes undesired NH4+ generation; however, there is still no clear consensus on the role of pore structure. In this study, carbon materials with different surface properties were used as supports to synthesize tailored Pd-Cu catalysts, assessing the role of micro- and mesopores in catalyst activity and selectivity in relation to mass transfer. Catalysts with Pd-Cu loadings of 1–1 and 1.5–1 wt% were examined. Higher catalytic activity was observed in catalysts supported on materials with low micropore volume, as limited reagent accessibility to metal within micropores hindered their effectiveness. It was also demonstrated that selectivity to NH4+ increased with higher micropore volume and micropore contribution to surface area, attributed to an imbalance in reagent transfer. This imbalance led to a higher H/N ratio at active sites within micropores and a corresponding increase in pH.The authors greatly appreciate the support from Spanish Agencia Estatal de Investigación RTI2018-098431-B-I00 (MCIU/AEI/FEDER, UE) and PID2021-123079OB-I00 project funded by MCIN/AEI/10.13039/501100011033 and ERDF/EU. STEM-XEDS data were recorded at the facilities of the DME-UCA node of the Spanish Unique Infrastructure for Electron Microscopy of Materials (ICTS, ELECMI). Dydia Tanisha González thanks the Regional Government of Madrid a research grant (PEJ-2020-AI/AMB-17551). G.A.M. thanks Ministerio de Universidades for the FPU20/03969 grant
Analysis of periodic patterns, noise characteristics, and predictive modeling of polar motion and length of day
No full textEarth orientation parameters (EOP) are critical for applications in orbit determination, astronomy, space geodesy, and geophysics. Accurate predictions of EOP rely on the identification of both deterministic periodic patterns and noise characteristics. This study addresses these requirements by analyzing the Polar Motion (PM) and Length Of Day (LOD) time series to determine its stochastic model structure, estimated using least squares variance component estimation (LS-VCE). With this model, deterministic periodic patterns were extracted through least squares harmonic estimation (LS-HE) and validated against colored noise components to identify significant signals. Using the IERS 14 C04 data from January 1, 2000, to December 31, 2019, the study identified the noise as power-law with a spectral index of -1.5, suggesting non-stationary fractional Brownian characteristics. LS-HE detected dominant frequencies in PM–notably the Chandler and annual signals–and in LOD, with annual, semiannual, 14-day, and 9-day signals. Building on these findings, short-, mid-, and long-term prediction model were developed for the PM and LOD time series from September 2021 to December 2022. The predictive model combines the LS-HE-extracted signals and the noise model to generate forecasts. These predictions were compared with other models from the Second Earth Orientation Parameter Prediction Comparison Campaign, demonstrating competitive accuracy, particularly for the initial forecast days. The results validate that combining LS-HE with a realistic noise model provides an effective approach for short-term of the PM and LOD forecasting, meeting the accuracy goals of geodetic and geophysical applications.SB were partially supported by Generalitat Valenciana (SEJIGENT/2021/001). SB was also partially supported by the European Union-NextGenerationEU (ZAMBRANO 21-04
David Roas (Dir.) (2024). Historia de lo fantástico en las narrativas latinoamericanas II (1940-2023). Iberoamericana / Vervuert, Colección Ediciones de Iberoamericana, 152
No full textCarmen Alemany Bay «David Roas (Dir.) (2024). Historia de lo fantástico en las narrativas latinoamericanas II (1940-2023). Iberoamericana / Vervuert, Colección Ediciones de Iberoamericana, 152», 532 pp. ISBN: 978-84-9192-372-5
Entre bulos y desinformación: los obstáculos al Reglamento Europeo de Restauración
No full textEn medio de la creciente degradación de la tierra, la desertificación y las disparidades socioeconómicas, la restauración ecológica ofrece una oportunidad única para abordar los desafíos ecológicos y sociales. El Decenio de las Naciones Unidas sobre la Restauración de los Ecosistemas (2021-2030), el reciente Reglamento de la UE sobre la Restauración de la Naturaleza (UE, 2024) y el Plan Nacional de Restauración (MITECO, 2024) ponen de manifiesto un firme compromiso político para hacer de la restauración una piedra angular de los esfuerzos para combatir el cambio climático, la desertificación y la pérdida de biodiversidad. En virtud del NRR de la UE, cada Estado miembro debe intensificar sus esfuerzos para restaurar al menos el 20% de las superficies terrestres y marinas de aquí a 2030 y todas las zonas que necesiten restauración de aquí a 2050
Nostalgia for More Sensible Times: José Nicolás de Azara and the New Diplomatic Practices of Revolutionary France
No full textLa diplomacia en tiempos del Directorio (1795-1799) y del Consulado (1799-1804) napoleónico experimentó una transformación radical respecto a los usos diplomáticos del Antiguo Régimen. En este marco, la figura de José Nicolás de Azara, embajador del rey Carlos IV, adquirió gran relevancia como observador privilegiado. Su larga experiencia diplomática en Roma y, más tarde, en París, le permitió comparar las viejas prácticas aristocráticas con los nuevos códigos revolucionarios. El objetivo del trabajo se centra en explorar cómo Azara interpretó los nuevos usos diplomáticos, al tiempo que se indaga en qué medida dichos cambios supusieron verdaderas innovaciones o, por el contrario, reprodujeron con nuevas formas las dinámicas ya presentes en la diplomacia del Antiguo Régimen. Para ello se ha analizado la correspondencia conservada en el Archivo Histórico Nacional, la Biblioteca Nacional, el Archivo General de Palacio en España y el Archivo del Ministerio de Asuntos Extranjeros de Francia.Diplomacy during the Directory (1795-1799) and the Napoleonic Consulate (1799-1804) underwent a profound transformation compared to the practices of the Ancien Régime. Within this framework, the figure of José Nicolás de Azara, ambassador of King Charles IV, emerged as a privileged observer. His extensive diplomatic experience in Rome and later in Paris enabled him to contrast the aristocratic practices of the past with the new revolutionary codes. The purpose of this article is to examine how Azara interpreted these new diplomatic practices, while also assessing to what extent such changes represented genuine innovations or, alternatively, the continuation of preexisting dynamics under new forms. To this end, the study draws on correspondence preserved in the Archivo Histórico Nacional, the Biblioteca Nacional, the Archivo General de Palacio and the Archive du Ministère des Affaires Étrangères of France.Este artículo se inscribe en el marco del proyecto Las barricadas del recuerdo: historia y memoria de la Era de las revoluciones en España e Hispanoamérica, 1776-1848 (PID-120048GB-I00), financiado por el Ministerio de Ciencia, Innovación y Universidades
How can we place the latitude of Alicante
No full textCómo podemos situar la latitud de Alicante en vista lateral y en vista superior
Experiências de aprendizagem da prática clínica em estagiários do curso de licenciatura em enfermagem da Universidade de Colima
No full textLa formación del profesional de enfermería incluye tradicionalmente teoría y práctica estructurada en entornos hospitalarios y/o ambulatorios, a fin de desarrollar las habilidades necesarias para interpretar, intervenir y cuidar a pacientes. En el presente se describen las Experiencias del Aprendizaje de la Práctica Clínica en Pasantes de la Licenciatura en Enfermería, de la Universidad de Colima, del periodo 2024-2025. Se trata de un estudio cualitativo, con aproximación de la fenomenología social. La recolección de la información fue a través de entrevistas semiestructuradas y a profundidad. De 110 sujetos, la muestra fueron nueve participantes, de noveno semestre que realizan servicio social constitucional. Los resultados revelan las vivencias, el aprendizaje auténtico, los escenarios clínicos, las habilidades y el contacto con profesores del área clínica, como las principales experiencias de aprendizaje durante la Práctica Clínica. Podemos concluir que las experiencias se dividen en dos momentos, el primero, donde los estudiantes perciben la pasantía como una oportunidad para aplicar conocimientos teóricos y desarrollar habilidades prácticas en un entorno real. Sin embargo, al inicio, esta visión estaba acompañada de emociones como miedo y ansiedad, reflejo de la inseguridad ante las exigencias del ámbito clínico y las expectativas de aprendizaje técnico y adaptación a nuevas responsabilidades; en el segundo momento, los participantes valoran la pasantía como una experiencia transformadora, donde adquirieron competencias técnicas como el manejo de equipos médicos y habilidades socioemocionales como la empatía y la resolución de conflictos. Asimismo, el estudio da cuenta de las áreas de oportunidad que pueden ser atendidas o reforzadas durante los años de carrera en clases de aula, tanto de carácter técnico profesionalizante (canalización, toma de signos vitales, farmacología, papanicolau, manejo de bombas de infusión, entre otras), como de tipo transversal, asociadas al desarrollo de habilidades socioemocionales para lidiar con ciertas actitudes grotescas, del día a día.The training of nursing professionals traditionally includes theory and structured practice in hospital and/or outpatient settings, in order to develop the skills necessary to interpret, intervene, and care for patients. This paper describes the Clinical Practice Learning Experiences of Interns in the Bachelor of Nursing program at the University of Colima for the 2024-2025 period. This is a qualitative study with a social phenomenology approach. Information was collected through semi-structured, in-depth interviews. Of 110 subjects, the sample consisted of nine participants in their ninth semester who are performing constitutional social service. The results reveal the experiences, authentic learning, clinical scenarios, skills, and contact with clinical faculty as the main learning experiences during the clinical practice. We can conclude that the experiences are divided into two moments. In the first, students perceive the internship as an opportunity to apply theoretical knowledge and develop practical skills in a real environment. However, at the beginning, this vision was accompanied by emotions such as fear and anxiety, reflecting insecurity in the face of the demands of the clinical setting and expectations of technical learning and adaptation to new responsibilities. In the second stage, participants value the internship as a transformative experience, where they acquired technical skills such as the handling of medical equipment and socio-emotional skills such as empathy and conflict resolution. Likewise, the study highlights areas of opportunity that can be addressed or reinforced during the course of the degree program in classroom settings, both in terms of technical professional skills (such as catheterization, taking vital signs, pharmacology, Pap smears, and infusion pump management, among others) and cross-cutting skills associated with the development of social-emotional skills to deal with certain challenging attitudes encountered on a daily basis.A formação do profissional de enfermagem inclui tradicionalmente teoria e prática estruturada em ambientes hospitalares e/ou ambulatoriais, com o objetivo de desenvolver as habilidades necessárias para interpretar, intervir e cuidar dos pacientes. No presente artigo, são descritas as Experiências de Aprendizagem da Prática Clínica em Estagiários do Curso de Licenciatura em Enfermagem da Universidade de Colima, no período de 2024-2025. Trata-se de um estudo qualitativo, com abordagem da fenomenologia social. A recolha de informações foi feita por meio de entrevistas semiestruturadas e aprofundadas. De 110 indivíduos, a amostra foi composta por nove participantes do nono semestre que realizam serviço social constitucional. Os resultados revelam as experiências, a aprendizagem autêntica, os cenários clínicos, as habilidades e o contacto com professores da área clínica como as principais experiências de aprendizagem durante a Prática Clínica. Podemos concluir que as experiências se dividem em dois momentos: o primeiro, em que os estudantes percebem o estágio como uma oportunidade para aplicar conhecimentos teóricos e desenvolver habilidades práticas em um ambiente real. No entanto, no início, essa visão era acompanhada por emoções como medo e ansiedade, reflexo da insegurança diante das exigências do ambiente clínico e das expectativas de aprendizagem técnica e adaptação a novas responsabilidades; no segundo momento, os participantes valorizam o estágio como uma experiência transformadora, onde adquiriram competências técnicas como o manuseio de equipamentos médicos e habilidades socioemocionais como empatia e resolução de conflitos. Da mesma forma, o estudo relata as áreas de oportunidade que podem ser atendidas ou reforçadas durante os anos de carreira em aulas presenciais, tanto de caráter técnico profissionalizante (canalização, medição de sinais vitais, farmacologia, papanicolau, manuseio de bombas de infusão, entre outras), quanto de tipo transversal, associadas ao desenvolvimento de habilidades socioemocionais para lidar com certas atitudes grotescas do dia a dia
The representation of Margaret of Austria in the poetry of Jean Lemaire de Belges
No full textMargarita de Austria (1480-1530), hija del archiduque Maximiliano de Austria y de María de Borgoña, destacó por su faceta diplomática y sus grandes dotes políticas. Se encargó de ejercer la regencia de los Países Bajos, primero en nombre de su padre y, posteriormente, de su sobrino Carlos, y llegaría a convertirse en una de las mujeres con mayor poder de su tiempo. Era una persona muy culta y una gran mecenas, que transformó Malinas en un importante centro cultural. Uno de los poetas que estuvo bajo su protección fue Jean Lemaire de Belges, uno de los primeros escritores humanistas en lengua francesa. En este artículo, observaremos la representación de Margarita de Austria que aparece en dos obras de Jean Lemaire de Belges, compuestas en 1505, La couronne margaritique y su Épître de l’Amant vert. Estos textos están muy relacionados con el contexto cultural de la época, y particularmente con las dos grandes querellas literarias de ese período, la querelle des femmes y la querelle de «La belle dame sans mercy». Analizaremos la figura femenina que encontramos ensalzada en ambas obras y veremos cómo el escritor defiende la capacidad que tiene su mecenas de ocupar puestos de poder.Margaret of Austria (1480-1530), daughter of Archduke Maximilian of Austria and Mary of Burgundy, was an outstanding diplomat and politician. She was entrusted with the regency of the Netherlands, first on behalf of her father and later of her nephew Charles. She became one of the most powerful women of her time. She was a very erudite person and a great patron of the arts who transformed Mechelen into an important cultural centre. One of the poets who came under her protection was Jean Lemaire de Belges, one of the first humanist writers in the French language. This study analyses how Margaret of Austria is represented in two works written by Jean Lemaire de Belges in 1505, La couronne margaritique and his Épître de l’Amant vert. These two texts are closely related to the cultural context of the time and to the two literary debates of the period, the querelle des femmes and the querelle de «La belle dame sans mercy». We will see how women characters are praised in these works and how the writer defends his patron’s ability to occupy positions of power.Este estudio se enmarca en el proyecto de investigación «Literatura y reginalidad en la España de los siglos XVI y XVII: las mujeres de la casa de Austria» (Proyecto PAIDI, PROYEXCEL_00847, Junta de Andalucía, IP: Cristina Moya García)
Hydrochar supported Mg–Fe layered double hydroxide hybrid for efficient and reusable removal of tetracyclines from water
No full textA hybrid photocatalyst, Mg–Fe-LDH@HC (layered double hydroxide supported on corn-stalk hydrochar), was synthesized via coprecipitation and evaluated for the removal and photodegradation of tetracyclines in water. X-ray diffraction (XRD) confirmed the formation of a hydrotalcite-like phase with partial amorphous carbon contribution, while SEM–EDS mapping evidenced a uniform dispersion of Mg–Fe-LDH over the hydrochar surface. The hybrid exhibited an apparent optical bandgap of 1.81 eV, favoring visible-light absorption. Under ultraviolet irradiation and optimized operational conditions (H2O2 = 5.4 μM, pH = 6.0, 25 °C), Mg–Fe-LDH@HC achieved 99.09 % total tetracycline degradation after 120 min. Kinetic fitting followed a pseudo-second-order model (R2 > 0.94), indicating a chemisorption-dominated mechanism coupled with reactive oxygen species (ROS) generation. Radical scavenging and EDTA inhibition tests demonstrated that photogenerated electrons and •OH radicals were the main oxidative agents, with additional contributions from a heterogeneous Fenton pathway with no evidence of a homogeneous Fenton mechanism. The catalyst retained 91.3 % of its initial efficiency after five reuse cycles, with partial recovery after mild regeneration. Acute toxicity assays using Artemia salina, Daphnia magna, and Raphidocelis subcapitata revealed a 65–80 % reduction in post-treatment toxicity compared to the untreated effluent. These results demonstrate that Mg–Fe-LDH@HC is an efficient, recyclable, and eco-compatible photocatalyst for the degradation of antibiotic contaminants in water systems.The authors acknowledge the financial support provided by the Universidad Técnica de Manabí through the research project “Synthesis of new hybrid nanomaterials for the removal of emerging contaminants present in water” (PYT3670-CONV2024-FCMFQ0022). Additionally, the authors gratefully acknowledge the support of the Amazon State University (Universidad Estatal Amazónica) through the project UEA-SGD-DINV-PI-0015. The authors are also grateful for the support of the Research Technical Services of the Universidad de Alicante in the characterization of the materials studied
Day and night comparison
No full textComparación del día y la noche con el modelo Sol-Tierra (equinoccios y solsticios)