Política Monetaria y Cambios de Régimen en los tipos de Interés del Mercado Interbancario

We analyse the dynamic behaviour of the 1-month interest rate of the Spanish money market between 1987 and 2001. The rate is modelled as a squared-root diffusion process that allows the rate to change depending on the state of the economy. The switch between regimes is governed by a first-order Markov process with state-dependent transition probabilities. We find two clearly differentiated regimens that can be related with changes in the monetary policy. We find periods of extremely high and volatile interest rates, which seem to be associated with episodes characterized by strong pressures in the exchange markets. This kind of behaviour is the less probable one. The second regime presents a bigger persistence, and it is characterized by less volatile and low interest rates that behave clearly as a random walk..En este trabajo analizamos el comportamiento dinámico del tipo de interés a un mes del mercado interbancario español entre 1987 y 2001. Se utiliza un proceso de difusión tipo raíz cuadrada que permite que el tipo cambie dependiendo del estado en el que se encuentre la economía. El cambio entre regímenes es dirigido por un proceso de Markov de primer orden con probabilidades de transición estado dependientes Encontramos dos regímenes claramente diferenciados que podemos relacionar con cambios en la política monetaria. Encontramos periodos en los que el tipo de interés es extremadamente alto y volátil, los cuales parecen estar asociados con episodios caracterizados por fuertes presiones en los mercados cambiarios. Este tipo de comportamiento es el menos probable. El segundo régimen presenta una mayor persistencia y está caracterizado por tipos de interés bajos poco volátiles que se comportan claramente como un paseo aleatorio.Impuesto inflacionario óptimo, Coeficiente legal de caja

A fault detection system for a geothermal heat exchanger sensor based on intelligent techniques

[Abstract ]:This paper proposes a methodology for dealing with an issue of crucial practical importance in real engineering systems such as fault detection and recovery of a sensor. The main goal is to define a strategy to identify a malfunctioning sensor and to establish the correct measurement value in those cases. As study case, we use the data collected from a geothermal heat exchanger installed as part of the heat pump installation in a bioclimatic house. The sensor behaviour is modeled by using six different machine learning techniques: Random decision forests, gradient boosting, extremely randomized trees, adaptive boosting, k-nearest neighbors, and shallow neural networks. The achieved results suggest that this methodology is a very satisfactory solution for this kind of systems.Junta de Castilla y León; LE078G18. UXXI2018/000149. U-220.Ministerio de Economía, Industria y Competitividad; DPI2016-79960-C3-2-

The role of power device technology in the electric vehicle powertrain

In the automotive industry, the design and implementation of power converters and especially inverters, are at a turning point. Silicon (Si) IGBTs are at present the most widely used power semiconductors in most commercial vehicles. However, this trend is beginning to change with the appearance of wide-bandgap (WBG) devices, particularly silicon carbide (SiC) and gallium nitride (GaN). It is therefore advisable to review their main features and advantages, to update the degree of their market penetration, and to identify the most commonly used alternatives in automotive inverters. In this paper, the aim is therefore to summarize the most relevant characteristics of power inverters, reviewing and providing a global overview of the most outstanding aspects (packages, semiconductor internal structure, stack-ups, thermal considerations, etc.) of Si, SiC, and GaN power semiconductor technologies, and the degree of their use in electric vehicle powertrains. In addition, the paper also points out the trends that semiconductor technology and next-generation inverters will be likely to follow, especially when future prospects point to the use of “800 V" battery systems and increased switching frequencies. The internal structure and the characteristics of the power modules are disaggregated, highlighting their thermal and electrical characteristics. In addition, aspects relating to reliability are considered, at both the discrete device and power module level, as well as more general issues that involve the entire propulsion system, such as common-mode voltage.This work has been supported in part by the Government of the Basque Country through the fund for research groups of the Basque University System IT1440-22 and the Ministerio de Ciencia e Innovación of Spain as part of project PID2020-115126RB-I00 and FEDER funds. Finally, the collaboration of Yole Développement (Yole) is appreciated for providing updated data on its resources

Proposal of Hybrid Discontinuous PWM Technique for Five-Phase Inverters under Open-Phase Fault Operation

One of the most common issues in inverters are open-circuit faults (OPF). In this scenario, a proper fault-tolerant technique must be used to improve the motor performance. Although basic fault-tolerant modulation techniques are normally preferred, this paper proposes a discontinuous pulse-width modulation algorithm (HD-PWM) to operate five-phase inverters under a single OPF. In particular, loss equalization between the remaining switches after a fault occurs is the main objective of the HD-PWM algorithm, thus preventing future faults from occurring. The efficiency and harmonic distortion of the proposed technique are compared to the well-known sinusoidal PWM by simulation and experimentation under OPF conditions. The results obtained show a great performance of the proposed modulation technique, obtaining a relevant efficiency improvement.This work has been supported in part by the Government of the Basque Country within the fund for research groups of the Basque University system IT1440-22 and the MCIN/AEI/10.13039/501100011033 within the project PID2020-115126RB-I00

Impact of different levels of handling on Solea senegalensis culture: effects on growth and molecular markers of stress

[EN] Aquaculture routine practices may cause stress induction on the fish and compromise their welfare affecting the production. This experiment aimed to evaluate the potential links between handling during culture with stress responses and growth on Senegalese sole (Solea senegalensis). We worked with two fish cohorts in terms of initial body weight and culture stage: Trial 1 included specimens in the fattening stage (226 ± 4.96 g) and Trial 2 animals in the pre-fattening stage (27.20 ± 0.44 g). The tested culture protocol, which lasted 6 and 4 months for Trial 1 and 2, respectively, mainly reduced handling-derived stressors in the experimental tanks via lowering routine samplings to a minimum. This decrease of the handling-derived stress was reflected in both trials with lower concentration of circulating cortisol in blood plasma from the experimental fish when compared to controls. Moreover, the proposed protocol promoted higher growth in the fish cultured in the less disturbing protocol in Trial 2. Higher specific growth rates and mean body weight and length were reported. In order to further explore the potential beneficial effects of our protocol, we studied the musculoskeletal from Trial 2 gene expression of key genes regulating glucocorticoid signaling pathway and apoptosis: glucocorticoid receptors 1 and 2 (gr1, gr2), heat shock protein 90 AA (hsp90aa), and caspase 6 (casp6). In line with the cortisol reduced level in this trial, gr1, hsp90aa, and casp6 genes showed lower expression in the samples coming from the experimental group. The findings of this study provide valuable information to the aquaculture industry for the management of Solea senegalensis stress and welfare.SIPublicación en abierto financiada por el Consorcio de Bibliotecas Universitarias de Castilla y León (BUCLE), con cargo al Programa Operativo 2014ES16RFOP009 FEDER 2014-2020 DE CASTILLA Y LEÓN, Actuación:20007-CL - Apoyo Consorcio BUCL

A 3D Reduced Common Mode Voltage PWM Algorithm for a Five-Phase Six-Leg Inverter

Neutral point voltage control converters (NPVCC) are being considered for AC drive applications, where their additional degree of freedom can be used for different purposes, such as fault tolerance or common mode voltage (CMV) reduction. For every PWM-driven converter, the CMV is an issue that must be considered since it can lead to shaft voltages between rotor and stator windings, generating bearing currents that accelerate bearing degradation, and can also produce a high level of electromagnetic interference (EMI). In light of these considerations, in this paper a three-dimensional reduced common mode voltage PWM (3D RCMV-PWM) technique is proposed which effectively reduces CMV in five-phase six-leg NPVCCs. The mathematical description of both the converter and the modulation technique, in space-vector and carrier-based approaches, is included. Furthermore, the simulation and experimental analysis validate the CMV reduction capability in addition to the good behaviour in terms of the efficiency and harmonic distortion of the proposed RCMV-PWM algorithm.This work has been supported in part by the Government of Basque Country within the fund for research groups of the Basque University system IT1440-22 and MCIN/AEI/10.13039/ 501100011033 within the project PID2020-115126RB-I00

New models involving quantum chemical parameters for assessing the chromatographic retention process

.Knowledge about the theoretical relationship between the analyte properties and the critical chromatographic parameters is mandatory for a better interpretation of the separation mechanism and a more leisurely development of quantitative studies. In a preliminary stage of this work, we introduce the Gumbel distribution, the extreme value distribution type-I widely used in other fields, as a novel tool for modelling the chromatographic peak shape. Further, we develop mathematical models to evaluate the effect of the experimental variables and various quantum parameters on the chromatographic indices, such as the retention time, capacity factor, asymmetry factor, tailing factor and number of theoretical plates. Finally, we propose a mechanistic behaviour for the chromatographic separation process based on the structure-retention relationship of fifteen selected drugs involving several molecular quantum parametersS

La creatividad en la construcción de campos de sentido

En medio del rediseño del mundo y de todos sus sistemas se está presenciando el mayor movimiento de masas de personas, bienes, fábricas, finanzas frenéticas e ideas en la historia. Los grandes flujos hacen que la nueva norma sea nómada. Sin embargo, persiste un anhelo de pertenencia, distinción e identidad que se resiste al fenómeno “cualquier momento y en cualquier lugar” habilitado por la digitalización, que está cambiando la forma en que interactuamos con el espacio, el lugar y el tiempo. Las viejas certezas se están desmoronando y los sistemas se están rompiendo a una velocidad creciente. La preocupación está latente cuando inventamos un tipo diferente de ciudad. Pero es en este escenario, donde es la ciudad cívica, la comunidad creativa, la que trata de encontrar un camino a través de las principales fallas, dilemas y potenciales de nuestro tiempo: vidas compartidas, desigualdad, angustia ambiental y vitalidad urbana. Este es el lugar donde en palabras de Gabriel (2013, 2015) emerge un campo de sentido, reinventamos el anclaje, un espacio común urbano, la conexión, pero también la posibilidad y la inspiración. La creatividad es una fuente de desarrollo integral del territorio. Reconocer y promover la comunidad creativa y su valor identitario es asegurar la calidad de vida y el desarrollo ambiental sustentable; cultural, social y económico. Esta investigación se dirige a examinar el enfoque de ciudades creativas, y la perspectiva emergente de las comunidades creativas. Se discute la coexistencia de ambas tendencias y sus implicancias para el mejoramiento de la calidad de vida y en la construcción de la sustentabilidad ambiental urbana

Evaluation of the accuracy of GHI and DNI forecasts by IFS and Harmonie models over Spain

Póster elaborado para la conferencia "SolarPaces 2016" celebrada los días 11-14 de octubre de 2016 en Abu Dhabi.This Project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 654984

Coocurrencia de trastornos de personalidad en pacientes con trastornos de ansiedad

The co-occurrence between personality disorders and anxiety disorders may have important implications. Multiple diagnoses can give us an idea of the severity of the disorder, functioning impairment and prognosis. The aim of this study was two-fold, to analyze the co-occurrence between personality disorders and anxiety disorders, and to identify personality disorder profiles in different anxiety disorders. A total of 31 patients with anxiety disorders participated in the study. They were divided into four groups: specific phobia, social phobia, generalized anxiety and panic with or without the presence of agoraphobia. The assessment instruments used were The Millon Clinical Multiaxial Inventory II and the Anxiety Disorders Interview according to the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders. The specific phobia group presented lower scores on the different scales and lower frequency of personality disorders. On the contrary, the generalized anxiety group had a higher rate of multiple diagnoses of personality disorders. Higher scores were observed in the schizoid, dependent, self-defeating, avoidant and compulsive scales. Each anxiety disorder presented a profile of personality disorders. Co-occurrence between disorders may help to understand the success or failure of a treatment, so the systematic evaluation of pathological personality in the clinical setting is recommended.    La coocurrencia entre los trastornos de personalidad y los trastornos de ansiedad puede tener implicaciones importantes. Los diagnósticos múltiples nos pueden dar idea de la gravedad de la alteración, el deterioro del funcionamiento y el pronóstico. El objetivo de este estudio fue doble, analizar la coocurrencia entre trastornos de personalidad y trastornos de ansiedad, e identificar perfiles de trastornos de personalidad en los diferentes trastornos de ansiedad. En este estudio participaron 31 pacientes con trastornos de ansiedad, distribuidos en cuatro grupos: fobia específica, fobia social, ansiedad generalizada y pánico, con y sin presencia de agorafobia. Los instrumentos de evaluación utilizados fueron El Inventario Clínico Multiaxial de Millon II y la Entrevista para los Trastornos de Ansiedad según el Manual diagnóstico y estadístico de los trastornos mentales IV. El grupo de fobia específica presenta puntuaciones más bajas en las distintas escalas y menor frecuencia de trastornos de personalidad. Por el contrario, el grupo de ansiedad generalizada presenta mayor tasa de diagnósticos múltiples de trastornos de personalidad. Las puntuaciones más altas se observan en las escalas esquizoide, dependiente, autodestructiva, evitativa y compulsiva. Cada trastorno de ansiedad presenta un perfil de trastornos de personalidad. Tener en cuenta la coocurrencia entre trastornos puede ayudar a comprender el éxito o no de un tratamiento, por lo que la evaluación sistemática de la personalidad patológica en el ámbito clínico es recomendable.&nbsp