Salviati como modelo: su influencia en Luis de Vargas

La formación italiana de Luis de Vargas con Perino del Vaga es uno de los aspectos a los que recientemente se ha arrojado luz gracias a las investigaciones de prestigiosos historiadores como Nicole Dacos. Este artículo pretende seguir incidiendo en esa línea, aportando nuevas evidencias del influjo de la pintura y dibujo de Francesco Salviati en el sevillano, además de intentar aproximar sus años de aprendizaje en Florencia y en Roma entre 1544 y 1550. Al mismo tiempo se estudian los referentes formales de una de las obras maestras de Vargas: La Alegoría de la Inmaculada Concepción de la catedral de Sevilla que concluyó en 1561 tras su estancia italiana.The Italian training of Luis de Vargas under Perino del Vaga teaching has recently be en studied by renowned art historian researchers such as Nicole Dacos. The present article pretends to continue to trace the previously line, contributing new evidences of Francesco Salviati drawing and painting influence on the Sevillian artist. Also an attempt to approach his years of apprentice in Florence and Rome between 1544 and 1550 are offered. At the same time formal sources of Vargas masterpieces are studied: The Allegory of the Immaculate Conception from the Cathedral of Seville, completed in 1561 after his Italian visit

Degenerate parametric oscillation in quantum membrane optomechanics

The promise of innovative applications has triggered the development of many modern technologies capable of exploiting quantum effects. But in addition to future applications, such quantum technologies have already provided us with the possibility of accessing quantum-mechanical scenarios that seemed unreachable just a few decades ago. With this spirit, in this work we show that modern optomechanical setups are mature enough to implement one of the most elusive models in the field of open system dynamics: degenerate parametric oscillation. The possibility of implementing it in nonlinear optical resonators was the main motivation for introducing such model in the eighties, which rapidly became a paradigm for the study of dissipative phase transitions whose corresponding spontaneously broken symmetry is discrete. However, it was found that the intrinsic multimode nature of optical cavities makes it impossible to experimentally study the model all the way through its phase transition. In contrast, here we show that this long-awaited model can be implemented in the motion of a mechanical object dispersively coupled to the light contained in a cavity, when the latter is properly driven with multi-chromatic laser light. We focus on membranes as the mechanical element, showing that the main signatures of the degenerate parametric oscillation model can be studied in state-of-the-art setups, thus opening the possibility of studying spontaneous symmetry breaking and enhanced metrology in one of the cleanest dissipative phase transitions.Comment: We welcome comments, suggestions, and (constructive) criticis

Otras fuentes grabadas utilizadas por Francisco de Zurbarán

[EN] We present new engraved sources applied by Francisco de Zurbarán to coiupose some of his most important works. Together with engravings by Durero, Philippe Gaile, Tempesta and Sadeler, is speciaüy significant the employenent of XVI cenatury Florentine woodcuts, the utilization of architectural motifs from Philippe Galle engravings applied in the «Apoteosis de Santo Tomás de Aquino, as well as the using of German playing cards from the beginnings of the XVI century.Peer reviewe

Oxidative degradation of a novel AMP/AEP blend designed for CO2 capture based on partial oxy-combustion technology

Versión aceptada. Embargo 24 mesesSolvent degradation and volatile compound emissions are two of the major concerns about the deployment of carbon capture technologies based on chemical absorption. In this context, partial oxy-combustion might reduce the solvent degradation due to the use of a higher CO2 concentrated flue gas. This work evaluates the oxidative degradation of a novel AMP/AEP blend, namely POS #1, under partial oxy-combustion conditions. The effects of temperature and flue gas composition were evaluated in terms of solvent loss, degradation rates, NH3 emissions and degradation products. The experiments were set at temperatures up to 70 °C and two levels of O2 concentration – 3%v/v and 6%v/v. The CO2 concentration of the flue gas ranged between 15%v/v and 60%v/v CO2. The novel solvent POS#1 showed high resistance to degrade and resulted in lower degradation rates than MEA in all the operating conditions evaluated in this work. The maximum degradation of AEP and AMP was 24% and 19%, respectively. MEA degraded almost double under the same conditions. Temperature and O2 concentration enhanced the oxidative degradation of POS #1. However, the use of higher CO2 concentration in the flue gas led to lower degradation rates of AEP and AMP and hence oxidative degradation was partially inhibited under partial oxy-combustion conditions. The presence of higher CO2 content in the flue gas decreased the NH3 production and a 70% reduction of its emissions was achieved as the CO2 concentration shifted from 15%v/v to 60%v/v. Other major degradation compounds such as formate and 2,4-lutidine were also decreased. New degradation products were not identified so that the suggested degradation pathways proposed in the literature were not influenced by the presence of higher CO2 concentrations.Ministerio de Economia y Competitividad CTM-2014-58573-RUnión Europea, European Development Research Fund (EDRF

Preparación de soportes biomateriales de naturaleza proteica mediante electrohilatura

La electrohilatura se ha postulado como un método sencillo, versátil y escalable a nivel industrial que permite obtener nanofibras por aplicación de un campo eléctrico de alto voltaje entre la punta de una aguja, donde se deposita una gota de solución de un polímero, y un colector metálico. Uno de los campos de aplicación más prometedores de esta tecnología es el enfocado al desarrollo de soportes biomateriales para el sector biomédico. Sin embargo, el control de los parámetros del proceso es clave para la obtención de productos eficaces. En este sentido, este trabajo presenta un estudio sistemático del efecto de los principales parámetros de la electrohilatura que pueden afectar al diámetro de las fibras obtenidas, enfocado específicamente al desarrollo de soportes biomateriales de naturaleza proteica (gelatina y colágeno), por tratarse de substratos de similar naturaleza a los componentes fibrosos encontrados en las matrices extracelulares de los tejidos biológicos. Los resultados obtenidos indican que factores como el tipo de polímero, la concentración, el disolvente y la conductividad del colector tienen una influencia significativa en el diámetro final de las nanofibras. Sin embargo, no se observó influencia en el diámetro cuando se varió el voltaje, caudal y distancia al colector del sistema

Accelerated MEA degradation study in hybrid CO2 capture systems

CO2 capture systems are typically divided into pre- post- and oxyfuel- combustion systems. However, the interest on hybrid systems, which integrate elements of more than one of the above systems, is attracting major attention in recent times due to the potential higher energy efficiency. In this work, degradation studies have been conducted to identify operational issues related to amines degradation. Oxidative MEA degradation in presence of flue gas resembling oxygen enriched combustion has been investigated. MEA loss was 27% when flue gas with 15% CO2 was used at 70°C, while only 20% loss was found in the presence of 50% CO2, indicating that hybrid CO2 capture systems may be used to decrease amine degradation of traditional postcombustion technologies. N-(2-hydroxyethyl)piperazin-3-one, N-(2-hydroxyethyl)-2-(2-hydroxyethylamino) acetamide, 2- oxadolidone, N-(2-hydroxyethyl)imidazole and N-N’-bis(2-hydroxyethyl)oxamine have been identified as MEA degradation products

Teaching Experiences in Chemical Engineering: Design, Manufacturing and Start-up of a Lab-scale Distillation Unit using Problem-based Learning

Se ha propuesto y puesto en práctica una nueva metodología de aprendizaje basado en problemas en una asignatura de carácter experimental en la carrera de ingeniería química en la Escuela Técnica Superior de Ingeniería de la Universidad de Sevilla (España). La metodología se basa en el trabajo con grupos reducidos y aprendizaje basado en problemas, proponiendo nuevos desafíos y oportunidades para el desarrollo de competencias de alumnos de ingeniería. Los alumnos han desarrollado tareas de diseño de procesos, selección de alternativas, toma de decisiones, diseño de ingeniería básica y gestión de compras, que han culminado con el montaje y puesta en marcha de una unidad de destilación a escala laboratorio. La metodología ha permitido trabajar todas las competencias adscritas a la asignatura con un alto grado de participación y motivación del alumnado. Por lo tanto, se considera una herramienta atractiva y útil para su incorporación en asignaturas de experimentación en ingeniería química.A new problem solving methodology is proposed for a course which is essentially experimental for student of chemical engineer at the Higher Technical Engineering School of the University of Seville in Spain is proposed. The methodology is based on small group work and problem-based learning, proposing new challenges and opportunities to develop skills and competencies in engineering student. The students developed tasks regarding process design, selection of optimal alternative, decision making, basic engineering design and purchase management, which concluded with the assembly and starting-up of a laboratory scales distillation unit. The methodology allowed working all subject competences with high participation and motivation from the students. Therefore, it is considered to be a useful and attractive tool to be incorporated to experimental chemical engineering courses.Departamento de Ingeniería Química y AmbientalInstituto de Ciencias de la Educación de la Universidad de Sevill