Interest and Applicability of Meta-Heuristic Algorithms in the Electrical Parameter Identification of Multiphase Machines

Multiphase machines are complex multi-variable electro-mechanical systems that are receiving special attention from industry due to their better fault tolerance and power-per-phase splitting characteristics compared with conventional three-phase machines. Their utility and interest are restricted to the definition of high-performance controllers, which strongly depends on the knowledge of the electrical parameters used in the multiphase machine model. This work presents the proof-of-concept of a new method based on particle swarm optimization and standstill time-domain tests. This proposed method is tested to estimate the electrical parameters of a five-phase induction machine. A reduction of the estimation error higher than 2.5% is obtained compared with gradient-based approaches.Plan Estatal 2013-2016 Retos - Proyectos I+D+i DPI2013-44278-RPlan Estatal 2013-2016 Retos - Proyectos I+D+i DPI2016-76144-

Experiencia práctica de tipo interdisciplinar para manejo de dispositivos de potencia, instrumentación electrónica, sistemas microprocesadores e identificación paramétrica de sistemas dinámicos

El cambio en el entorno y en las dimensiones internas de las instituciones de educación superior provoca la necesidad de revisar el modelo educativo. Actualmente asistimos a la transformación de la Universidad provocada en gran medida por la revolución del conocimiento y las nuevas tecnologías de la información, que generan cambios tanto en el entorno como en los recursos internos disponibles en las universidades. El reto imperativo durante la próxima década es el cambio que debe producirse tanto en los productos que la Universidad ofrece (titulaciones, programas de postgrado, investigación, difusión, etc.) como en la forma en la que ofrece estos produ ctos, resultando necesario revisar los procesos docentes y haciéndose imperativa la introducción de la formación multidisciplinar. En este trabajo se presenta una experiencia práctica de tipo multidisciplinar, que aúna conceptos relacionados c on el manejo de herramientas de simulación basadas en Matlab y Simulink para el estudio de sistemas electrónicos digitales, analógicos y de potencia, así como el procesamiento de la señal y la identificación paramétrica de sistemas dinámicos. Se describirá el sistema con el que se trabajará (una máquina de inducción de 5 fases gobernada por un convertidor de potencia de 2 nivel es), para posteriormente definir su modelado empleando Matlab y Simulink y plantear los objetivos del trabajo de si mulación a realizar por los alumnos

Can a nurse-led community-based model of hypertension care improve hypertension control in Ghana? Results from the ComHIP cohort study.

OBJECTIVES: To evaluate the effectiveness of the Community-based Hypertension Improvement Project (ComHIP) in increasing hypertension control. SETTING: Lower Manya Krobo, Eastern Region, Ghana. PARTICIPANTS: All adult hypertensive community members, except pregnant women, were eligible for inclusion in the study. We enrolled 1339 participants, 69% of whom were female. A total of 552 had a 6-month visit, and 338 had a 12-month visit. INTERVENTIONS: We report on a package of interventions where community-based cardiovascular disease (CVD) nurses were trained by FHI 360. CVD nurses confirmed diagnoses of known hypertensives and newly screened individuals. Participants were treated according to the clinical guidelines established through the project's Technical Steering Committee. Patients received three types of reminder and adherence messages. We used CommCare, a cloud-based system, as a case management and referral tool. PRIMARY OUTCOME: Hypertension control defined as blood pressure (BP) under 140/90 mm Hg. SECONDARY OUTCOMES: changes in BP and knowledge of risk factors for hypertension. RESULTS: After 1 year of intervention, 72% (95% CI: 67% to 77%) of participants had their hypertension under control. Systolic BP was reduced by 12.2 mm Hg (95% CI: 14.4 to 10.1) and diastolic BP by 7.5 mm Hg (95% CI: 9.9 to 6.1). Due to low retention, we were unable to look at knowledge of risk factors. Factors associated with remaining in the programme for 12 months included education, older age, hypertension under control at enrolment and enrolment date. The majority of patients who remained in the programme were on treatment, with two-thirds taking at least two medications. CONCLUSIONS: Patients retained in ComHIP had increased BP control. However, high loss to follow-up limits potential public health impact of these types of programmes. To minimise the impact of externalities, programmes should include standard procedures and backup systems to maximise the possibility that patients stay in the programme

An integrated community-based hypertension improvement program improves hypertension awareness in Ghana

Background: We evaluated the impact of an integrated community-based hypertension intervention on hypertension awareness (defined as prior diagnosis of hypertension among persons with elevated blood pressure), prevalence of hypertension, and behavioural risk factors for hypertension. Methods: The community-based hypertension improvement program implements an integrated package of interventions in one health district in Ghana. The project is evaluated using a quasi-experimental design consisting of population-based cross-sectional surveys (the focus of this paper) in an intervention and a comparison districts, plus a cohort study in the intervention district-only. The cohort study determined hypertension control. Results: At baseline, we interviewed 2,400 respondents (1,200 each from the Lower Manya Krobo (intervention district) and Akuapim South (comparison district) and interviewed 2,533 adults aged 30 years or older from same districts at endline – 1,306 from the Lower Manya Krobo and 1,227 from Akuapim South districts. Hypertension awareness significantly increased in the intervention district from 47.7%; 95% confidence interval (CI) (42.0–53.7) at baseline to 59.2%; 95% CI (53.8–64.6) at endline, while in the comparison district, there was a small, non-significant decrease from 44.7%; 95% CI (38.8–50.8) to 36.6%; 95% CI (31.3–42.2). There is strong evidence of difference between these two districts OR (P = 0.005). There were no significant differences in changes of hypertension prevalence or treatment from baseline to endline between the two districts The proportion of people that know more than 2 risk factors increased in the control groups (odds ratio [OR], 1.770; 95% CI, 1.242–2.5142) while this does not change significantly in the intervention group (OR, 0.865; 95% CI, 0.61–1.210). Conclusion: This integrated community-based program improved hypertension awareness, and some behavioural risk factors, but not hypertension prevalence at the community level

Effects of copy number variations on brain structure and risk for psychiatric illness: Large-scale studies from the ENIGMA working groups on CNVs

The Enhancing NeuroImaging Genetics through Meta-Analysis copy number variant (ENIGMA-CNV) and 22q11.2 Deletion Syndrome Working Groups (22q-ENIGMA WGs) were created to gain insight into the involvement of genetic factors in human brain development and related cognitive, psychiatric and behavioral manifestations. To that end, the ENIGMA-CNV WG has collated CNV and magnetic resonance imaging (MRI) data from ~49,000 individuals across 38 global research sites, yielding one of the largest studies to date on the effects of CNVs on brain structures in the general population. The 22q-ENIGMA WG includes 12 international research centers that assessed over 533 individuals with a confirmed 22q11.2 deletion syndrome, 40 with 22q11.2 duplications, and 333 typically developing controls, creating the largest-ever 22q11.2 CNV neuroimaging data set. In this review, we outline the ENIGMA infrastructure and procedures for multi-site analysis of CNVs and MRI data. So far, ENIGMA has identified effects of the 22q11.2, 16p11.2 distal, 15q11.2, and 1q21.1 distal CNVs on subcortical and cortical brain structures. Each CNV is associated with differences in cognitive, neurodevelopmental and neuropsychiatric traits, with characteristic patterns of brain structural abnormalities. Evidence of gene-dosage effects on distinct brain regions also emerged, providing further insight into genotype–phenotype relationships. Taken together, these results offer a more comprehensive picture of molecular mechanisms involved in typical and atypical brain development. This “genotype-first” approach also contributes to our understanding of the etiopathogenesis of brain disorders. Finally, we outline future directions to better understand effects of CNVs on brain structure and behavior

The difference in metallicity distribution functions of halo stars and globular clusters as a function of galaxy type: A tracer of globular cluster formation and evolution

Observations of globular clusters (GCs) and field stars in the halos of the giant elliptical galaxy Cen A and the spiral galaxy M31 show a large range of cluster-to-star number ratios ('specific frequencies'). The cluster-to-star ratio decreases with increasing metallicity by a factor of 100-1000, at all galactocentric radii and with a slope that does not seem to depend on radius. In dwarf galaxies, the GCs are also more metal-poor than the field stars on average. These observations indicate a strong dependence of either the cluster formation efficiency or the cluster destruction rate on metallicity and environment. We aim to explain these trends by considering various effects that may influence the observed cluster-to-star ratio as a function of metallicity, environment and cosmological history. We show that both the cluster formation efficiency and the maximum cluster mass increase with metallicity, so they cannot explain the observed trend. Destruction of GCs by tidal stripping and dynamical friction destroy clusters over too small a range of galactocentric radii. We show that cluster destruction by tidal shocks from giant molecular clouds in the high-density formation environments of GCs becomes increasingly efficient towards high galaxy masses and, hence, towards high metallicities. The predicted cluster-to-star ratio decreases by a factor 100-1000 towards high metallicities and should only weakly depend on galactocentric radius due to orbital mixing during hierarchical galaxy merging, consistent with the observations. The observed, strong dependence of the cluster-to-star ratio on metallicity and the independence of its slope on galactocentric radius can be explained by cluster destruction and hierarchical galaxy growth. As a result, we find that the metallicity-dependence of the cluster-to-star ratio does not reflect a GC formation efficiency, but a survival fraction. (Abridged

Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic

This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic

XVI International Congress of Control Electronics and Telecommunications: "Techno-scientific considerations for a post-pandemic world intensive in knowledge, innovation and sustainable local development"

Este título, sugestivo por los impactos durante la situación de la Covid 19 en el mundo, y que en Colombia lastimosamente han sido muy críticos, permiten asumir la obligada superación de tensiones sociales, políticas, y económicas; pero sobre todo científicas y tecnológicas. Inicialmente, esto supone la existencia de una capacidad de la sociedad colombiana por recuperar su estado inicial después de que haya cesado la perturbación a la que fue sometida por la catastrófica pandemia, y superar ese anterior estado de cosas ya que se encontraban -y aún se encuentran- muchos problemas locales mal resueltos, medianamente resueltos, y muchos sin resolver: es decir, habrá que rediseñar y fortalecer una probada resiliencia social existente - producto del prolongado conflicto social colombiano superado parcialmente por un proceso de paz exitoso - desde la tecnociencia local; como lo indicaba Markus Brunnermeier - economista alemán y catedrático de economía de la Universidad de Princeton- en su libro The Resilient Society…La cuestión no es preveerlo todo sino poder reaccionar…aprender a recuperarse rápido.This title, suggestive of the impacts during the Covid 19 situation in the world, and which have unfortunately been very critical in Colombia, allows us to assume the obligatory overcoming of social, political, and economic tensions; but above all scientific and technological. Initially, this supposes the existence of a capacity of Colombian society to recover its initial state after the disturbance to which it was subjected by the catastrophic pandemic has ceased, and to overcome that previous state of affairs since it was found -and still is find - many local problems poorly resolved, moderately resolved, and many unresolved: that is, an existing social resilience test will have to be redesigned and strengthened - product of the prolonged Colombian social conflict partially overcome by a successful peace process - from local technoscience; As Markus Brunnermeier - German economist and professor of economics at Princeton University - indicates in his book The Resilient Society...The question is not to foresee everything but to be able to react...learn to recover quickly.Bogot

Estudio de la alimentación de ganaderías bravas de la marisma del Guadalquivir, campiña de Jerez y campo de Gibraltar

44 páginas.-- 2 figuras.-- 23 tablas.-- 27 referencias.-- El equipo PASTOS-SEVILLA expresa su más sincero agradecimiento al Prof. Dr. V.J.C. MALATO-BELIZ de la Estaçao Nacional de Melhoramento de Plantas, Elvas (Portugal), por su desinteresada y valiosa colaboración al determinar todo el material vegetal recolectado en las zonas estudiadasEl equipo PASTOS-SEVILLA ha estudiado la nutrición de vacadas de raza de lidia ubicadas en áreas de Andalucía Occidental de tradicional importancia ganadera como son: Marisma del Guadalquivir.--Campiña de Jerez .-- Estribaciones del Campo de Gibraltar. Como en las vacadas se ha examinado la alimentación de todas las clases de ganado, animales jóvenes y adultos, hembras y machos, etc., ha sido necesario estudiar no sólo el pasto, principal fuente de alimento para hembras y animales jóvenes, sino también todos aquellos suplementos y concentrados que recibe el ganado cuando la hierba escasea y que en muchas ocasiones -caso de los toros destinados a la lidia- constituyen prácticamente su único alimento. Por otra parte, se ha estudiado el suelo de las zonas más representativas de cada región en particular, debido a la importancia que tienen las propiedades del substrato en el desarrollo y composición de los pastos.Peer reviewe

Resultados de la implantación del Plan de Actuación Conjunta en el Infarto Agudo de Miocardio

Objetivos. Analizar la efectividad, fiabilidad y seguridad de la trombólisis prehospitalaria en el infarto agudo de miocardio en el Distrito Sanitario "Costa del Sol" de Málaga. Diseño. Estudio de intervención en el que se compara un periodo (fase I) en el cual aún no se realizaba trombólisis prehospitalaria, con otro posterior (fase II) en el que sí se hacía. La efectividad del proceso se midió por el porcentaje de trombólisis realizadas dentro de las dos primeras horas de evolución del infarto agudo de miocardio, la fiabilidad por el número de pacientes tratados fuera del hospital con trombólisis no indicadas, y la seguridad por el número de complicaciones relacionadas con la misma ocurridas en los tratamientos extrahospitalarios. Se realizó un ajuste mediante regresión logística en el que se tuvieron en cuenta las posibles variables de confusión relacionadas con el porcentaje de tratamientos realizados dentro de las dos primeras horas. Resultados. El porcentaje de tratamientos realizados dentro de las dos primeras horas de infarto agudo de miocardio en la fase II (49%) es significativamente mayor (p< 0,001) que en la fase I (8%). El modelo de regresión logística múltiple demostró que los pacientes que recibieron el tratamiento trombolítico extrahospitalario en la fase II tuvieron 130 veces más posibilidades de recibir dicho tratamiento dentro de las dos primeras horas del infarto agudo de miocardio que los pacientes tratados con trombolíticos en la fase I en el hospital. No se realizó ningún tratamiento prehospitalario no indicado, y no se objetivó ninguna complicación relacionada con la trombólisis prehospitalaria. Conclusiones. La trombólisis prehospitalaria en nuestro Distrito Sanitario demuestra ser una intervención efectiva, fiable y segura