A fractional-order model for calendar aging with dynamic storage conditions

Funding for open access charge: Universidad de Granada / CBUA.Due to the increasing importance of lithium-ion batteries in electric vehicle and renewable energy applications, battery aging is a subject of intense research. Although many laboratory experiments are performed under well-controlled static conditions, batteries are stored and operated under varying conditions of temperature and state of charge in their real-life performance, so that a suitable model for predicting the effects of calendar aging in lithium-ion batteries with dynamic conditions is highly desirable. In this paper, we review previous models to calculate capacity loss due to calendar aging under variable temperature and state-of-charge conditions according to experimentally observed power-law behavior, and propose a novel model based on fractional calculus. To validate the new model, we compare its predictions with experimental results showing that it can reproduce the non-monotonic behavior that is observed when the state of charge or the temperature change significantly. This is an interesting application of fractional calculus since this characteristic is not obtained with non-fractional models.Universidad de Granada / CBU

A physics-based fractional-order equivalent circuit model for time and frequency-domain applications in lithium-ion batteries

This work was partially supported by the Regional Government of Andalusia under project P18-RT-3303 from Plan Andaluz de Investigación, Desarrollo e Innovación (PAIDI 2020), by the Spanish Ministry of Science and Innovation and by FEDER funds via Project MCI-20-PID2019-110955RB-I00, by the Principality of Asturias via project AYUD/2021/50994, and by the FPU-UGR-Banco Santander Program for Predoctoral Scholarships. Funding for open access charge: Universidad de Granada / CBUAEquivalent circuit models (ECMs) remain the most popular choice for online applications in lithium-ion batteries because of their simpler parameterization and lower computational requirements in comparison to electrochemical models. Nevertheless, standard ECMs lack physical insight and fail to accurately reproduce cell behavior under a wide range of operating conditions. For this reason, the development of physics-informed ECMs becomes essential so as to provide a better description of the physical processes while maintaining a reduced computational complexity. In this article, we propose a novel physics-based ECM derived directly from an electrochemical model, so that there is a clear correlation between circuit states and internal battery states, as well as circuit and physical parameters. The proposed model yields an RMS error below 1.46 mV for cell voltage, 0.28% for the surface concentration in the active material particles, 0.6% for the electrode-averaged electrolyte concentration and 0.32 mV for the charge-transfer overpotentials. Another key feature of this model is the relationship between circuit parameters and those identified in frequency-domain tests, which allows us to characterize and validate the model experimentally. We understand that the presented model constitutes an alternative to standard ECMs as well as electrochemical models as it combines advantageous characteristics from both of them.Regional Government of Andalusia P18-RT-3303Spanish Ministry of Science and InnovationFEDER: MCI-20-PID2019-110955RB-I00Principality of Asturias AYUD/2021/50994PU-UGR-Banco SantanderUniversidad de Granada / CBU

A compact model of the ZARC for circuit simulators in the frequency and time domains

Equivalent-circuit models containing fractional-order elements are often employed to make use of fractionalorder calculus in the frequency and time domains in a variety of applications. Many of these circuits contain constant-phase elements that appear in parallel with a resistor in a configuration called ZARC. But to avoid fractional order derivatives and include it in circuit simulators, the ZARC itself can also be replaced by equivalent circuit models that only contain integer order elements, such as resistors and capacitors. In this article, a novel compact model is presented to substitute the ZARC by a multiple-RC network. This model is valid for a continuous value of the order exponent and is applicable over a very wide range of frequencies, making it useful in both the frequency and time domains. Since it uses only basic functions and operators, it has been easily implemented as a subcircuit in circuit simulators. The validity of the model has been verified and it has been compared with some previously proposed passive circuit models. The model has also been discussed in relation to the initialization problem, which is an often overlooked challenge in fractional-order circuits.Universidad de Granada/CBU

Supuestos prácticos de Economía Financiera

El trabajo no ha sido publicadoEl documento es el resultado de la labor desarrollada por los ocho profesores que componen el equipo durante sus años de docencia en las Universidades de Burgos, Salamanca y Valladolid. El objetivo es elaborar un manual de supuestos prácticos para la asignatura Dirección Financiera que tiene el carácter de troncal en la licenciatura de Administración y Dirección de Empresas. El trabajo pretende ilustrar al alumno desde un punto de vista práctico sobre la toma de decisiones en la empresa. Para ello se estructura en cuatro capítulos que recogen los problemas de inversión en certeza, inversión en incertidumbre, modelo de cartera de proyectos, y estructura de capital de acuerdo con el descriptor que el Ministerio de Educación y Ciencia aprobó para la asignatura.Junta de Castilla y León. Dirección General de Universidades e InvestigaciónCastilla y LeónES

Synthesis, in vitro evaluation and molecular docking of a new class of indolylpropyl benzamidopiperazines as dual AChE and SERT ligands for Alzheimer’s disease

During the last decade, the one drug-one target strategy has resulted to be inefficient in facing diseases with complex ethiology like Alzheimer's disease and many others. In this context, the multitarget paradigm has emerged as a promising strategy. Based on this consideration, we aim to develop novel molecules as promiscuous ligands acting in two or more targets at the same time. For such purpose, a new series of indolylpropyl-piperazinyl oxoethyl-benzamido piperazines were synthesized and evaluated as multitarget-directed drugs for the serotonin transporter (SERT) and acetylcholinesterase (AChE). The ability to decrease beta-amyloid levels as well as cell toxicity of all compounds were also measured. In vitro results showed that at least four compounds displayed promising activity against SERT and AChE. Compounds 18 and 19 (IC50 = 3.4 and 3.6 mu M respectively) exhibited AChE inhibition profile in the same order of magnitude as donepezil (DPZ, IC50 = 2.17 mu M), also displaying nanomolar affinity in SERT. Moreover, compounds 17 and 24 displayed high SERT affinities (IC50 = 9.2 and 1.9 nM respectively) similar to the antidepressant citalopram, and significant micromolar AChE activity at the same time. All the bioactive compounds showed a low toxicity profile in the range of concentrations studied. Molecular docking allowed us to rationalize the binding mode of the synthesized compounds in both targets. In addition, we also show that compounds 11 and 25 exhibit significant beta-amyloid lowering activity in a cell-based assay, 11 (50% inhibition, 10 mu M) and 25 (35% inhibition, 10 mu M).Comisión Nacional de Investigación Cientifica y Tecnológica (CONICYT) CONICYT FONDECYT 1170269 1170662 3170264 FONDEQUIP EQM 160042 Conicyt-PFCHA/Doctorado Nacional 2018-21180427 Fisher Foundation for Alzheimer's Researc

Uso de herramientas digitales educativas online para promover un aprendizaje activo de la Fisiología Animal (DIGIFISIO)

Depto. de Genética, Fisiología y MicrobiologíaFac. de Ciencias BiológicasFALSEsubmitte

Financial decisions and growth opportunities: a Spanish firm's panel data analysis

This paper analyses the influence of financial leverage decisions, dividend payout policies and the ownership structure on the firm market value when companies either face, or do not face, profitable growth opportunities. A sample of 101 large non-financial publicly-traded Spanish companies is used. The results confirm the relevance of debt and dividends in terms of firm value creation by showing a negative relationship between firm value and both leverage and dividend payments in the presence of growth opportunities. On the contrary, this relationship turns out to be positive when firms have no profitable investment projects. The results also demonstrate the relevance of ownership structure in the allocation of firm resources.

Álbum de música y educación : composiciones actuales para el aula

XX Aniversario de la Revista Música y Educación, 1988-2008Se presenta un álbum con cuarenta y siete piezas breves y composiciones musicales de otros tantos autores, creadas para el trabajo en el aula. Incluye plantillas con distintos niveles de dificultad y objetivos pedagógicos, ordenadas por grados en tres secciones: vocal, instrumental y vocal-instrumental.MadridBiblioteca de Educación del Ministerio de Educación, Cultura y Deporte; Calle San Agustín 5 -3 Planta; 28014 Madrid; Tel. +34917748000; [email protected]