MODEL UPDATING AND STRUCTURAL HEALTH MONITORING OF HORIZONTAL AXIS WIND TURBINES VIA ADVANCED SPINNING FINITE ELEMENTS AND STOCHASTIC SUBSPACE IDENTIFICATION METHODS

Wind energy has been one of the most growing sectors of the nation’s renewable energy portfolio for the past decade, and the same tendency is being projected for the upcoming years given the aggressive governmental policies for the reduction of fossil fuel dependency. Great technological expectation and outstanding commercial penetration has shown the so called Horizontal Axis Wind Turbines (HAWT) technologies. Given its great acceptance, size evolution of wind turbines over time has increased exponentially. However, safety and economical concerns have emerged as a result of the newly design tendencies for massive scale wind turbine structures presenting high slenderness ratios and complex shapes, typically located in remote areas (e.g. offshore wind farms). In this regard, safety operation requires not only having first-hand information regarding actual structural dynamic conditions under aerodynamic action, but also a deep understanding of the environmental factors in which these multibody rotating structures operate. Given the cyclo-stochastic patterns of the wind loading exerting pressure on a HAWT, a probabilistic framework is appropriate to characterize the risk of failure in terms of resistance and serviceability conditions, at any given time. Furthermore, sources of uncertainty such as material imperfections, buffeting and flutter, aeroelastic damping, gyroscopic effects, turbulence, among others, have pleaded for the use of a more sophisticated mathematical framework that could properly handle all these sources of indetermination. The attainable modeling complexity that arises as a result of these characterizations demands a data-driven experimental validation methodology to calibrate and corroborate the model. For this aim, System Identification (SI) techniques offer a spectrum of well-established numerical methods appropriated for stationary, deterministic, and data-driven numerical schemes, capable of predicting actual dynamic states (eigenrealizations) of traditional time-invariant dynamic systems. As a consequence, it is proposed a modified data-driven SI metric based on the so called Subspace Realization Theory, now adapted for stochastic non-stationary and timevarying systems, as is the case of HAWT’s complex aerodynamics. Simultaneously, this investigation explores the characterization of the turbine loading and response envelopes for critical failure modes of the structural components the wind turbine is made of. In the long run, both aerodynamic framework (theoretical model) and system identification (experimental model) will be merged in a numerical engine formulated as a search algorithm for model updating, also known as Adaptive Simulated Annealing (ASA) process. This iterative engine is based on a set of function minimizations computed by a metric called Modal Assurance Criterion (MAC). In summary, the Thesis is composed of four major parts: (1) development of an analytical aerodynamic framework that predicts interacted wind-structure stochastic loads on wind turbine components; (2) development of a novel tapered-swept-corved Spinning Finite Element (SFE) that includes dampedgyroscopic effects and axial-flexural-torsional coupling; (3) a novel data-driven structural health monitoring (SHM) algorithm via stochastic subspace identification methods; and (4) a numerical search (optimization) engine based on ASA and MAC capable of updating the SFE aerodynamic model

Tipos de celos en una comunidad universitaria

La presente investigación identifica el tipo de celos existentes en las relaciones de pareja de los estudiantes del Centro Universitario UAEM Zumpango de la Universidad Autónoma del Estado de México, mediante la aplicación del instrumento CRS2 a 200 estudiantes. Los hallazgos muestran que el 35% de la población presenta celos sospechosos, es decir la conducta que manifiestan está basada en situaciones irracionales y pueden ser parte de una enfermedad mental a futuro; por lo que el 65% de la población se ubica en los celos reactivos, derivados de un hecho real. Estos datos son importantes, ya que contribuyen a pronosticar problemáticas como violencia en el noviazgo y “paranoia” celotípica

Tipos de celos en una comunidad universitaria

la presente investigación identifica el tipo de celos existentes en las relaciones de pareja de los estudiantes del Centro Universitario UAEM Zumpango , mediante instrumentos CRS2 a 200 estudiantes

ENG 1001G-010: English Composition & Language

International audienc

Sistema urbano-regional Valle Cuautitlán-Texcoco

El sistema urbano-regional Regional del Valle Cuautitlán-Texcoco se vincula a la dinámica urbana de la Zona Metropolitana de la Ciudad de México, y también con la megalópolis del centro del país. Es un sistema porque comprende varios municipios de la misma región e involucra actividades económicas, sociales, infraestructuras que conectan a la población que habita en la región. Este sistema se integra por otras regiones del oriente del Estado de México en vínculo importante con la Ciudad de México, en la parte nororiente y norte de la capital mexicana; también se presenta con características de expansión de la metrópoli con configuración urbana y contradicciones en lo rural y lo urbano y el desarrollo económico que caracteriza al sistema urbano-regional con problemáticas asociadas a la gestión y a la planificación de lo urbano-ambiental como un binomio inseparable en el patrón de ocupación de territorio en el Valle Cuautitlán-Texcoco

Afectación del sistema cardiovascular en la infección por SARS-CoV-2

Introduction: COVID-19 is an emerging disease with global incidence, which exhibits a greater number of complications in patients with comorbidities, mainly in those with a history of cardiovascular disease.Objective: to describe the implications of COVID-19 in the cardiovascular system.Method: A review of the literature was conducted in the MEDLINE, SciELO, JAMA and Elsevier databases, recovering 35 articles, which were taken as the basis for the present review. The combination of terms using search formulas was used to retrieve articles.Development: COVID-19 can be variable in correspondence with the presentation form and accompanying symptoms, as well as the recipient's immune response. SARS-CoV-2 binds to cells through the viral spike structural protein that binds to the angiotensin-converting enzyme 2 receptor from viral receptors; therefore, hypertensive patients or those with other cardiovascular conditions have a higher risk of developing severe forms of COVID-19. Among the cardiovascular diseases associated with infection by a coronavirus, myocarditis, arrhythmias, acute myocardial infarction and heart failure stand out.Conclusions: the main cardiovascular implications in patients with COVID-19 are arrhythmia, thromboembolic disease, myocarditis, heart failure of acute onset and myocardial infarction, which condition a more serious picture of the disease. The inflammatory response, hemodynamic changes secondary to the viral process, as well as hypoxemia, constitute mechanisms of negative impact on cardiovascular health, leading to the development of acute cardiac injury.Introducción: la COVID-19 es una enfermedad emergente con incidencia global, que exhibe mayor número de complicaciones en pacientes con comorbilidades, principalmente en aquellos con antecedentes de enfermedades cardiovasculares.Objetivo: describir las implicaciones de la COVID-19 en el sistema cardiovascular.Método: Se realizó una revisión de la literatura en las bases de datos MEDLINE, SciELO, JAMA y Elsevier, recuperándose 35 artículos, los cuales se tomaron de base para la presente revisión. Se empleó la combinación de términos mediante fórmulas de búsqueda para recuperar los artículos.Desarrollo: la COVID-19 puede ser variable en correspondencia con la forma de presentación y síntomas acompañantes, así como la respuesta inmunitaria del receptor. El SARS-CoV-2  se une a las células a través de la proteína estructural viral de espiga que se une al receptor de la enzima convertidora de angiotensina 2 a partir de receptores virales; por ello, los pacientes hipertensos o  con  otras  afecciones cardiovasculares tienen un mayor riesgo de desarrollar formas severas de COVID-19.  Dentro de las afectaciones cardiovasculares asociados a la infección por un coronavirus destacan la miocarditis, arritmias, infarto agudo de miocardio e insuficiencia cardíaca.Conclusiones: Las principales implicaciones cardiovasculares en los pacientes con COVID-19 son arritmia, enfermedad tromboembólica, miocarditis, insuficiencia cardiaca de inicio agudo e infarto de miocardio, las cuales condicionan un cuadro más grave de la enfermedad. La respuesta inflamatoria, los cambios hemodinámicos secundarios al proceso viral, así como la hipoxemia, constituyen mecanismos de repercusión negativa sobre la salud cardiovascular, llevando al desarrollo de lesión cardiaca aguda.

Temperature and particle concentration influence on the complex viscous behavior of a hydrophilic fumed silica suspension

Shear-thinning behavior (decrease of the apparent steady viscosity with shear) due to breaking of weak particle flocs and posterior alignment of individual particles in layers parallel to the flow direction is usually observed before the appearance of the shear-thickening behavior (increase of the apparent steady viscosity with shear). The shear-thickening behavior is mainly due to the dominant role played by hydrodynamic over Brownian and colloidal forces at relatively high shear. As a rule, the onset of shear-thickening behavior and the maximum viscosity value appear at lower shear rates when solid concentration increases, and temperature decreases. However, the influence of solid concentration and temperature on shear stress characteristic values have received less attention despite being the shear stress the true cause of microstructure changes that can provoke the appearance of the shear-thickening behaviour. A recently published empirical equation for the shear stress dependence of the steady viscosity of shear thickening fluids [T. Shende, V.J. Niasar, M. Babaei, J. Mol. Liq. 325 (2021) 115220] has been used for fitting experimental data (MARSIII, Thermo-Haake, Germany) of a hydrophilic fumed silica suspension (A200 (Evonik, Germany) in PPG400 (Sigma-Aldrich, Germany)). The influence of temperature (10,\ 30,\ 50,\ 70\degc) and solid concentration (10,\ 15,\ 20,\ 25%\ wt) on the shear-thickening behavior has been monitored recording their influence on the model parameters.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech