Análisis y diseño de un puente inversor trifásico VSI controlado mediante SVM utilizando un microcontrolador

La electrónica de potencia como una rama de la ingeniera eléctrica toma gran importancia para los sistemas eléctricos; se enfoca a diario en el estudio de dispositivos y/o elementos de mayor eficiencia. Son muchos los factores que demandan y exigen dispositivos eficientes, y estos factores están permeados en parte a las problemáticas de hoy día como: uso racional de recursos, protección del medio ambiente y bajo costo en equipos. Por lo tanto, dispositivos como los convertidores son tema de continuo análisis en todo el mundo. Como bien se sabe, los inversores son ampliamente utilizados en un margen de aplicaciones en los sistemas eléctricos, algunas como compensación, mejoramiento y calidad de la energía. Uno de los aspectos más estudiado del inversor está en su forma de control. Con los avances en la tecnología de los dispositivos semiconductores como los IGBT con conmutaciones más rápidas, se ha abierto una amplia gama de posibilidades a explorar

Formación y competencias enfermeras en urgencias de hospitales públicos de Tenerife.

La enfermería de urgencias, ha sido definida y defendida por múltiples organismos y asociaciones, como una rama en la que es necesario tener unos conocimientos y una formación específica que permitan dar una respuesta rápida y cualificada para prestar una atención sanitaria de calidad. Actualmente, en España, la formación postgrado y las especialidades de enfermería no están reconocidas a la hora de acceder a los puestos de trabajo. Numerosos enfermeros/as generalistas se encuentran trabajando en servicios especiales, como el servicio de urgencias, cumpliendo con las competencias establecidas por organismos autorizados y prestando una atención sanitaria lo más cualificada posible. Tras numerosos estudios, España se considera uno de los países con menor formación en urgencias, por lo que destaca la necesidad de personal formado en esta área, así como la de implantar una especialidad de urgencias y emergencias. La mayoría del personal de enfermería que trabaja en el servicio de urgencias, posee formación adicional, por ejemplo, máster, títulos propios o bien seminarios y talleres especializados, por lo que, el objetivo de este estudio es determinar la opinión de los enfermeros/as que trabajan en el servicio de urgencias de los hospitales públicos de Tenerife, acerca de su formación en competencias para trabajar en dicho servicio. Se realizará un estudio descriptivo de los hospitales seleccionados. Para la recogida de datos se empleará una encuesta utilizando escala Likert, preguntas con opción dicotómica, o de opción múltiple, que cumplimentarán los enfermeros/as del estudio. Los datos serán analizados mediante el programa estadístico SPSS Statistics 25.Emergency nursing has been defined and defended by multiple organizations and associations, as a branch in which it is necessary to have specific knowledge and training that allow a quick and qualified response to provide quality health care. Currently, in Spain, postgraduate training and nursing specialties are not recognized when it comes to accessing jobs. Many generalist nurses are working in special services, such as the emergency department, complying with the powers established by authorized organizations and providing the most qualified health care possible. After numerous studies, Spain is considered one of the countries with the least training in emergencies, which highlights the need for trained personnel in this area, as well as the need to implement a specialty of emergencies. Most of the nursing staff working in the emergency department have additional training, for example, a master's degree, their own degrees or specialized seminars and workshops, so the objective of this study is to determine the opinion of nurses who work in the emergency service of public hospitals in Tenerife, about their training in skills to work in that service. A descriptive study of the selected hospitals will be carried out. For data collection, a survey using a Likert scale, questions with a dichotomous option, or multiple choice, which will be completed by the nurses studied, will be used. The data will be analyzed using SPSS Statistics 25 program

The use of Polar Coordinates in the analysis of motor interaction in football according to the result.

The interactions of a Spanish football team of the Second A (10 official games) are analyzed, evaluating possible behavioral patterns that appear in a regular way in high level football. Observational methodology was used, by Polar Coordinates Analysis, to discover and evaluate the relationships generated between a considered focal behavior and the different conditioned categories, describing behavioral masses among the players. The matches were observed and recorded with an ad hoc observation instrument. The relations of dual character between the players taken as (focal behaviors) right midfielder and forward and the other players (conditioned conducts) were analyzed. The results show differences in the relationship established based on the outcome of the match. Matches that end with a favorable result, the right midfielder takes center stage, as a node of intermediation between the right centre back, left center back, left midfielder, and second striker. In these, the forward is clear receiver in the actions of completion. With the result of the unfavorable match, the connection networks change, generating a network of reciprocal interaction wider and different between the aforementioned player, right midfielder and the rest of the components, with special relation in the players that occupy the right back, left back, right centre back, right winger, left winger, second striker and forward. In these games the striker acquires a role of greater collaboration in the creation in offensive phases, participating as a node in the game network with intermediation functions

El perfil del paciente con esteatosis hepática metabólica remitido desde atención primaria al especialista

INTRODUCCIÓN: La esteatosis hepática metabólica (EHmet) supone actualmente la principal causa de hepatopatía crónica. Evitar su progresión requ iere la coordinación entre Atención Primaria (AP) y especializada siendo preciso conocer el perfil de paciente con EHmet que es derivado desde AP a especializada a través de la interconsulta electrónica (ICe) y el manejo desde especializada. MÉTODOS: Analizam os las ICe realizadas entre enero/2018 y diciembre/2020 desde AP a especializada. Identificadas las relacionadas con EHmet, se registraron variables demográficas, de laboratorio, clínicas y actitud por parte del especialista. Se estimó la fibrosis hepática a partir del índice FIB RESULTADOS:4. Registramos un total de 10969 ICe, identificando 385 (3,5%) por EHmet (53,8% hombres, 54,3±13,5 años). De estas, un 11,2% fue por hipertransaminasemia, 53,2% por hallazgos ecográficos e hipertransaminasemia, y en u n 35,6% sólo por hallazgos ecográficos. El 34,3% tenían diabetes tipo II, 55,1% hipertensión, 68,6% dislipemia, 54,8% obesidad, y 48,6% síndrome metabólico. De los pacientes diabéticos (n=132), el 67,4% tomaba metformina y el 5,3% un análogo humano del pép tido1 similar al glucagón (GLP1). El 55,6% eran abstemios. 38,8% (n=148) presentaban riesgo alto de padecer ≥F2. De estos, el 27% fue dado de alta sin seguimiento (35% sin recomendaciones al alta). CONCLUSIÓN: Existe un bajo porcentaje de derivación de p acientes con EHmet desde AP, teniendo una tercera parte riesgo alto de padecer fibrosis avanzada. Este perfil de paciente supone una oportunidad de detección precoz y tratamiento de EHmet, por lo que urge implementar protocolos y circuitos asistenciales co nsensuados con AP.INTRODUCTION: Metabolic Associated Fatty Liver Disease (MAFLD) is currently the main cause of chronic liver disease. To avoid its progression, it’s required the coordination between Primary Care (PC) and specialized care, in order to know the profile of the patient with MAFLD who is referred from PC to specialized care through electronic interconsultation (eIC) as well as its management. METHODS: We analysed the eIC carried out between January/2018 and December/2020 from PC to specialized care. Once eIC related to MAFLD were identified, we recorded demographic, laboratory, and clinical variables and the attitude of the specialist. Liver fibrosis was estimated from the FIB-4 index. RESULTS: We registered a total of 10969 eIC, identifying 385 (3.5%) due to MAFLD (53.8% men, 54.3±13.5 years). Of these, 11.2% were due to hypertransaminasemia, 53.2% due to ultrasound findings and hypertransaminasemia, and 35.6% due only to ultrasound findings. 34.3% had type II diabetes, 55.1% hypertension, 68.6% dyslipidaemia, 54.8% obesity, and 48.6% metabolic syndrome. Among the diabetic patients (n=132), 67.4% were being treated with metformin and 5.3% with glucagon-like peptide-1 (GLP-1). 55.6% of patients were teetotallers. 38,8% (n=148) had a high risk of suffering ≥F2. Among these, 27% were discharged without follow-up (35% with no recommendations at discharge). CONCLUSION: There is a low referral percentage of patients with MAFLD from PC, a third of them having a high risk of suffering from advanced fibrosis. This patient profile represents an opportunity for early detection and treatment of MAFLD, being necessary to implement protocols and care circuits coordinated with PC

Bridge–structure interaction analysis of a new bidirectional and continuous launching bridge mechanism

This paper presents a numerical study of the structural interaction between a bridge and a new continuous device for launching heavy structures using the force of friction. In this way, it provides a great contribution for the civil engineering field focused on a new method for launching bridges by a continuous and bidirectional mechanism. A non-linear finite element model using contact elements studies the structural interaction between the bridge and the new device. Bridge and device interaction are studied using linear and non-linear contact behavior. The substructuring technique is used for the bridge modeling in order to reduce the overall degrees of freedom. This technique allows the selection of the best arrangement for two mechanism models placed under the webs of the bridge: two parallel arrangements where external device is opposite or behind the internal one, and other arrangement with devices in series. Furthermore, the non-uniform load distribution over the mechanism was studied during the launching process. With this methodology, it is possible to study the structural behavior of the mechanism taking into account the real load distribution applied for the bridge during the launching process.This work was partially financed with FEDER funds by the Spanish Ministry of Science and Innovation through the Research Project BIA2012-31609 and the Gijon City Council through the SV-13-GIJON-1.7 project. We would also like to thank Swanson Analysis Inc. for the use of the ANSYS University research program and Workbench simulation environment. Finally, we would like to acknowledge the help of the Spanish Ministry of Economics and Competitiveness through the Research Project ALCANZA, IPT-380000-2010-012 INNPACTO program

Localización de la agenda 2030 en los municipios y la contratación pública verde como instrumento de implementación.

El presente trabajo pretende acreditar y divulgar el papel crucial de las Entidades Locales, y en concreto de los municipios para alcanzar los Objetivos y Metas de la Agenda 2030, poniendo en valor las materias de interés local directamente relacionadas con las metas a conseguir, facilitar un marco jurídico común que permita impulsar y promover la alineación de la actuación municipal a los objetivos de la Agenda 2030 y proponer la contratación pública como herramienta esencial de implementación.<br /

Analysis of the Influence of the thickness and the hole radius on the calibration coefficients in the hole-drilling method for the determination of non-uniform residual stresses

The Hole-Drilling method is a semi-destructive technique useful for obtaining residual stress distributions by drilling and measuring relieved strains. The standard for this method, i.e., ASTM E837 – 13a, is based on the Integral Method and facilitates obtaining the coefficient matrices required to solve the inverse problem and to calculate the residual stress at depths of up to 1.00 mm. A possible deviation from the coefficients given by this standard is searched when the piece has a small thickness or the hole diameter is not 2.00 mm. FEM simulations are performed with the aim of analysing these effects and proposing new matrices, expressions and correlations for conditions outside the usual thickness and diameter limits. A parametric sweep over a wide range of thicknesses and hole diameters has been implemented in ANSYS to establish a consistent and automated numerical procedure for widening the applicability of the Hole-Drilling method.Junta of Castile and Leon through grant no. BU053U16 (Cofunded by European Regional Development Fund/European Social Fund)

Study of the optimal waveforms for non-destructive spectral analysis of aqueous solutions by means of audible sound and optimization algorithms

Acoustic analysis of materials is a common non-destructive technique, but most efforts are focused on the ultrasonic range. In the audible range, such studies are generally devoted to audio engineering applications. Ultrasonic sound has evident advantages, but also severe limitations, like penetration depth and the use of coupling gels. We propose a biomimetic approach in the audible range to overcome some of these limitations. A total of 364 samples of water and fructose solutions with 28 concentrations between 0 g/L and 9 g/L have been analyzed inside an anechoic chamber using audible sound configurations. The spectral information from the scattered sound is used to identify and discriminate the concentration with the help of an improved grouping genetic algorithm that extracts a set of frequencies as a classifier. The fitness function of the optimization algorithm implements an extreme learning machine. The classifier obtained with this new technique is composed only by nine frequencies in the (3–15) kHz range. The results have been obtained over 20,000 independent random iterations, achieving an average classification accuracy of 98.65% for concentrations with a difference of ±0.01 g/L