La gestión integral de activos y pasivos en el negocio asegurador de vida: aproximación al caso español.

Este trabajo tiene por finalidad aproximarse a la gestión integral de activos y pasivos dentro del sector asegurador de vida español y al efecto que ejerce sobre el diseño de la cartera de inversión. Los estudios realizados a nivel internacional constatan el gran interés que ha tomado la gestión de activos y pasivos como herramienta estratégica. Al carecer de estudios que permitan conocer la situación de la gestión de activos y pasivos hemos tratado de realizar una aproximación a partir de las relaciones que se constatan en diversos trabajos entre el tipo de productos que comercializan las compañías, la regulación de la actividad y la composición de la cartera de inversionesThe purpose of this research is to approach the complete assets and liabilities management within Spanish Insurance Sector and its effect in portfolio design. The existing international researchs confirm the hug interest of assests and liabilities management as an estrategic instrument. The lack of estudies that allow us to know the situaction of assests and liabilities management makes us use the relations verifyed in several works, such as product types, activity regulation and portfolio composition

Damping low-frequency oscillations in power systems using grid-forming converters

The increasing incorporation of renewable energy in power systems is causing growing concern about system stability. Renewable energy sources are connected to the grid through power electronic converters, reducing system inertia as they displace synchronous generators. New grid-forming converters can emulate the behavior of synchronous generators in terms of inertia provision and other grid services, like power-frequency and voltage-reactive regulation. Nevertheless, as a consequence of synchronous generator emulation, grid-forming converters also present angle oscillations following a grid disturbance. This paper proposes two novel power stabilizers for damping low-frequency oscillations (LFOs) in the power system. The first power stabilizer provides power oscillation damping through active power (POD-P), and it is implemented in a grid-forming converter, using the active power synchronization loop to damp system oscillations by acting on the converter angle. The second one provides power oscillation damping through reactive power (POD-Q), and it is implemented in a STATCOM, using the voltage control loop to damp system oscillations. Both proposals are first assessed in a small-signal stability study and then in a comprehensive simulation. Moreover, two cases are considered: damping the oscillations of a single machine connected to an infinite bus through a tie-line, and damping the inter-area oscillations in a two-area system. Simulation results, as well as the stability study, demonstrate the ability of both stabilizers to damp power system oscillations, being the POD-P more effective than the POD-Q, but at the cost of requiring some kind of energy provision at the DC bus.This work was supported by the Spanish Research Agency under Project PID2019-106028RB-I00/ AEI/10.13039/501100011033

Estudio teórico de la coordinación del NO₂ a metales en fase gas y en la zeolita CuZSM-5

Consultable des del TDXPenden

OK, boomer : new users, different platforms, new challenges

The popularization of new interaction spaces brings new narratives and social phenomena that merit attention from the scientific community. Based on the existing literature on the new challenges facing the communication discipline with these emerging narratives, this editorial summarizes the empirical and theoretical contributions of the thematic issue entitled "New Narratives for New Consumers: Influencers and the Millennial and Centennial Generations." The authors emphasize that the studies selected for this thematic issue explore the innovative features and opportunities of the emerging scenarios and offer a cautionary account of their structural problems and the urgency of a new media literacy

Implementación de un Sistema de Medición de la Conductividad del Agua con Transmisión de Datos en Tiempo Real

This document shows the implementation of a water conductivity measurement system with the special attribute of data transmission in real time through Wi-Fi and Bluetooth devices. For the development of the proposed work, an evolutionary methodology was used, which is developed phase by phase, with the possibility of returning to a previous phase to make the pertinent adjustments. Within the development, the KEYESTUDIO sonda measurement sensor TDS V1 sensor module with XH2.54-3 was used, which connects to the ESP8266 data acquisition card together with the DS18B20 temperature sensor, being the IoT platform and a LabVIEW® interface monitoring panels for transmitted data of electrical conductivity and temperature of the chosen environment. It is important to mention that the implemented system provides effective monitoring of water conductivity from a remote location, yielding reliable values, without user intervention in the chosen environment.El presente documento muestra la implementación de un sistema de medición de la conductividad del agua con el atributo especial de transmisión de datos en tiempo real por medio de dispositivos wifi y bluetooth. Para el desarrollo del trabajo propuesto se hizo uso de una metodología de tipo evolutivo, la cual se va desarrollando fase por fase, con la posibilidad de regresar a una fase anterior para realizar los ajustes pertinentes. Dentro del desarrollo se hizo   uso del sensor KEYESTUDIO sonda de medición TDS V1 módulo de sensor con XH2.54-3, el cual se conecta a la tarjeta de adquisición de datos ESP8266 junto con el sensor de temperatura DS18B20, siendo la plataforma IoT y una interfaz de LabVIEW® los paneles de monitoreo para los datos transmitidos de conductividad eléctrica y temperatura del entorno escogido. Es importante mencionar que el sistema implementado brinda monitoreo efectivo desde un lugar remoto sobre conductividad del agua, arrojando valores fiables, sin intervención del usuario en el entorno escogido

Homocysteine treatment alters redox capacity of both endothelial and tumor cells

Homocysteine is a non-proteinogenic amino acid playing key roles in two interconnected metabolic pathways, namely, the activated methyl cycle and the linear trans-sulfuration pathway that allows the conversion of methionine to cysteine. A dysregulation of intracellular homocysteine metabolism could yield an increased export of this amino acid, leading to hyperhomocysteinemia, which has been associated with an increased risk of cardiovascular diseases. In spite of decades of experimental effort, there is no definitive consensus on what could be the molecular mechanisms whereby hyperhomocysteinemia could contribute to cardiovascular disease. The redox active nature of homocysteine has favored the idea of an induction of oxidative stress as the underlying mechanism of homocysteine toxicity. In contrast, homocysteine can also behave as an anti-oxidant. The present work is aimed to further analyze the capacity of homocysteine to modulate the redox capacity of both endothelial and tumor cells. [Our experimental work is supported by grants BIO2014-56092-R (MINECO and FEDER) and P12-CTS-1507 (Andalusian Government and FEDER) and funds from group BIO-267 (Andalusian Government). The "CIBER de Enfermedades Raras" is an initiative from the ISCIII (Spain)].Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Supramolecular protection from the enzymatic tyrosine phosphorylation in a polypeptide

Here we report two new artificial pseudopeptidic cages that bind the EYE peptide epitope in pure water at physiological pH (as studied by fluorescence and NMR spectroscopies). The supramolecular complexation of the Tyr residues efficiently precludes their subsequent PTK-catalysed phosphorylation. Our results show a supramolecular modulation of the PTK activity by competitive substrate caging.This work was supported by MINECO/FEDER (CTQ2012-38543-C03, CTQ2015-68429-R and CTQ2015-70117-R projects) and Generalitat de Catalunya (AGAUR, 2014 SGR 231)

Black-start capability of PV power plants through a grid-forming control based on reactive power synchronization

Power system restoration is a critical process for any power system. As synchronous generators are being replaced by power electronic converters used in renewable energy generation, the contribution of renewable energy power plants to power system restoration (PSR) after a black-out is becoming more relevant, the so-called black start capability. Existing solutions for providing black start capability to photovoltaic (PV) power plants rely on the use of energy storage systems (ESS) in a hybrid PV plant. In contrast, this paper proposes a solution for the contribution of PV power plants to the PSR that allows a completely autonomous black start process. Reactive power synchronization is used for controlling the PV inverters as virtual synchronous generators (VSG), providing grid-forming control and ensuring synchronism. During the black start process, the PV power is regulated to match the demand using a decentralized solution to share the load between multiple PV inverters. The solution has been validated to handle the most critical situations during the black start process such as the variation on the power source, i.e. irradiance, or on the supplied load and the connection to the main grid.This paper was supported by the Spanish Research Agency under project reference PID2019-106028RB-I00/AEI/10.13039/501100011 033

Metal coordination determines the catalytic activity of IrO2 nanoparticles for the oxygen evolution reaction

Acord transformatiu CRUE-CSICH2 production through water electrolysis is a promising strategy for storing sunlight energy. For the oxygen evolution reaction, iridium oxide containing materials are state-of-the-art due to their stability in acidic conditions. Moreover, precious metal content can be reduced by using small nanoparticles that show high catalytic activities. We performed DFT calculations on a 1.2 nm large IrO2 Wulff-like stoichiometric nanoparticle model (IrO2) with the aim of determining the factors controlling the catalytic activity of IrO2 nanoparticles. Results show that at reaction conditions tetra- and tricoordinated iridium centers are not fully oxidized, the major species being IrO(OH) and IrO(OH)2, respectively. Although the computed overpotential show that all centers present relatively similar reactivities, low coordinated iridium centers tend to be more active than the pentacoordinates sites of the well-defined facets. These low coordination sites are likely more abundant on amorphous nanoparticles, which could be one of the factors explaining the higher catalytic activity observed for non-crystalline materials

Aplicación de energía solar, para desarrollar capacidades referentes a la sustentabilidad en los alumnos

La educación en México así como en la UANL, esta tratando de concientizar a los estudiantes sobre la importancia del entorno social y ecológico desde los ámbitos profesional y humano. Por tal motivo, establece un programa por competencias, donde cada una de las unidades de aprendizaje contribuye a desarrollar competencias que permiten a los estudiantes favorecer la capacidad de reflexionar, buscar y seleccionar información para solucionar problemas, tanto de ingeniería como del medio ambiente, utilizando métodos y técnicas de análisis encaminados a proyectos de investigación básica utilizando recursos renovables como energía sustentable por ejemplo la energía solar, eólica, biomasa, flujos de agua, mareas, geotérmica etc. En este trabajo se presentan los resultados de un grupo de estudiantes, al desarrollar capacidades de esempeño de la Unidad de Aprendizaje de Física III, que conjuntan la integración de los conocimientos adquiridos en el curso, mediante un mini proyecto para utilizar energía solar en un modelo a escala de el salón de clase, para posteriormente extrapolarlo a una situación real como proyecto final, haciendo un uso efectivo de medios y recursos para el ahorro de energía y de la no contaminación del medio ambiente