Implementation of Model Reference Adaptive Control in a Dehydration System

[EN] In this article, the use of Model Reference Adaptive Control (MRAC) is proposed as a technique to regulate a system with input delay. As a case study, a thermal system represented by a cabin dehydrator is considered. The analysis of the selected system is carried out to determine the equations that describe its behavior, and a reference signal is designed, which is essential for the proper operation of the control algorithm. The identification of the parameters of the thermal system and the tuning of the adaptation gain are performed. The theory of Lyapunov is used to evaluate the stability of the system and design the control. The performance of the proposed control is compared with other methods using the performance index (L2 norm).[ES] En este artículo se propone el uso del Control Adaptable por Modelo de Referencia (MRAC) como técnica para regular un sistema con retardo en la entrada, como caso de estudio se considera un sistema térmico representado por un deshidratador de cabina. Se realiza el análisis del sistema seleccionado para determinar las ecuaciones que describen su comportamiento, y se diseña una señal de referencia, esencial para el correcto funcionamiento del algoritmo de control. Se realiza la identificación de los parámetros del sistema térmico y la sintonización de la ganancia de adaptación. Para evaluar la estabilidad del sistema y diseñar el control se utiliza la teoría de Lyapunov. El desempeño del control propuesto se compara con otros métodos empleando el índice de desempeño (norma L2).Sánchez-Sánchez, P.; Cebada Reyes, JG.; Montiel Martínez, A.; Reyes Cortés, JF. (2023). Implementación del control adaptable por modelo de referencia en un sistema de deshidratación. Revista Iberoamericana de Automática e Informática industrial. 21(1):39-51. https://doi.org/10.4995/riai.2023.19172395121

Mis casos clínicos de especialidades odontológicas

Libro que muestra la atención de casos clínicos particulares referente a las diferentes especialidades odontológicasLibro que muestra la atención de casos clínicos particulares referente a las diferentes especialidades odontológicasUniversidad Autónoma de Campeche Universidad Autónoma del Estado de Hidalgo Universidad Autónoma del Estado de Méxic

Mercados, volatilidad y gestión de futuros en México: el empleo del método ARCH y GARCH

"Las inversiones en contratos de futuros muestran un crecimiento rápido en el periodo, lo que evidencia que los individuos buscan rendimientos más altos y seguros, frente a la creciente volatilidad que ofrecen las tasas de interés y el tipo de cambio. S

Mercados, volatilidad y gestión de futuros en México: el empleo del método ARCH y GARCH

Investments in futures contracts show a fast growth in the period, which shows that individuals look for higher and safer returns, in the face of the growing volatility offered by interest rates and the exchange rate. ARCH and GARCH methods were used as instruments to identify the volatility degree in underlying assets of these contracts. Because of the results, volatility was reflected in the fact that it was persistent in the period, not so high, and even then that did not determine that the operations and amounts of investments in futures were higher or rising.Las inversiones en contratos de futuros muestran un crecimiento rápido en el periodo, lo que evidencia que los individuos buscan rendimientos más altos y seguros, frente a la creciente volatilidad que ofrecen las tasas de interés y el tipo de cambio. Se empleó el método ARCH y GARCH, como instrumentos de identificación del grado de volatilidad en activos subyacentes de estos contratos. Por los resultados, la volatilidad quedó reflejada de que sí fue persistente en el periodo, no tan alta, y aun así eso no determinó que las operaciones y los montos de inversiones en futuros fuesen mayores o crecientes

Molecular Markers in Ambient Air Associated with Biomass Burning in Morelos, México

Atmospheric particles with an aerodynamic diameter less than or equal to 2.5 micrometers (PM2.5) were collected at two sites located in the urban area of the city of Cuernavaca (Morelos) during a season when a large number of forest fires occurred. Three dicarboxylic acids (malonic, glutaric and succinic) and levoglucosan were analyzed by liquid chromatography coupled with mass spectrometry (ESI-Q-TOF) and soluble potassium (K+) was analyzed by ion chromatography. The concentration of PM2.5 increased on the days when the highest number of forest fires occurred. A strong correlation was observed between levoglucosan and K+, confirming the hypothesis that both are tracers of biomass burning (r = 0.57, p < 0.05). Levoglucosan (average 367.6 ng m−3, Site 2) was the most abundant compound, followed by succinic acid (average 101.7 ng m−3, Site 2), glutaric acid (average 63.2 ng m−3, Site 2), and malonic acid (average 46.9 ng m−3, Site 2), respectively. The ratio of C3/C4 concentrations ranged from 0.5 to 1.2, with an average of 0.8, which suggests great photochemical activity in the Cuernavaca atmosphere. The ratio of K+/levoglucosan concentrations (0.44) indicates that open fires are the main source of these tracers. The positive correlations between PM2.5 and levoglucosan and succinic and malonic acids suggest that such compounds are contributing to secondary organic aerosol particle formation

Both Chloroquine and Lopinavir/Ritonavir Are Ineffective for COVID-19 Treatment and Combined Worsen the Pathology: A Single-Center Experience with Severely Ill Patients

The off-label use of antiviral and antimalarial drugs has been considered by many researchers as a fast and relatively safe alternative to provide therapeutic options to treat COVID-19, but the assessment of such drug-specific effectiveness in this regard is far from complete. Especially, the current body of knowledge about COVID-19 therapeutics needs more data regarding drug effectiveness and safety in the severely ill patients with comorbidities. In the present article, we retrospectively analyze data from 61 patients that received treatment with chloroquine, lopinavir/ritonavir, both drugs administered together, or a standard treatment with no antiviral drugs, and the study was carried in severely ill patients. We found that either drug is ineffective at treating COVID-19, as they are not able to reduce hospitalization length, mortality, C-reactive protein (CRP), lactate dehydrogenase (LDH), d-Dimer, or ferritin, or to enhance gasometric parameters, lymphocytes, total leukocytes, and neutrophil levels, whereas both drugs administered together decrease circulating lymphocytes, increase LDH and ferritin levels, and more importantly, enhance mortality. In this way, our results show that both drugs are ineffective and even potentially harmful alternatives against SARS-CoV-2

Electivo de Externado 4 - ME204 - 202102

Curso de la especialidad, de la carrera de medicina, de carácter práctico del ciclo 12, en el que los estudiantes realizan discusiones clínicas o de administración o de investigación según la elección del estudiante, para desarrollar actividades en el área clínica o de gestión o de investigación. El curso del electivo de externado 4, busca desarrollar la competencia específica de profesionalismo aprendizaje autónomo y desarrollo profesional (nivel 3). El electivo de externado 4, le permitirá al estudiante generar aprendizajes que contribuyan a su desarrollo de los principales problemas médicos o quirúrgicos, investigación y gestión que le servirá en su vida profesional

Mexico ants: incidence and abundance along the Nearctic–Neotropical interface

International audienceto explore different aspects of the population and community research of ants at different spatial scales, and to aid in the establishment of conservation policies and actions. There are no copyright restrictions. Please cite this data paper when using its data for publications or teaching events