http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/18921 Trabajo escrito para titulación: Artículo Académico de 2024 Sat, 11 Apr 2026 22:32:55 GMT 2026-04-11T22:32:55Z http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19487 Accurate design, simulation and implementation of AC/DC inductors for power electronic converters Martínez Salgado, Elean Jim; Mejia Ruiz, Gabriel Eduardo; Ramos Guerrero, José Manuel; Arrieta Paternina, Mario Roberto; de la Cruz Soto, Javier; Chamorro Vera, Harold René Este artículo propone una metodología holística y mejorada para el diseño de inductores en circuitos electrónicos de potencia que operan a altas frecuencias. Esta metodología incluye un diseño analítico, un modelado de elementos finitos del comportamiento electromagnético con el software JMAG, un análisis de simulación en un entorno de Simulink y una verificación experimental de la efectividad del diseño del inductor en un prototipo de convertidor elevador de potencia en escala de laboratorio. El enfoque holístico nos permitió alcanzar todas las especificaciones objetivo, como la potencia máxima (300 W), el voltaje mínimo (60 V), la inductancia (1.77 mH) y la ondulación de corriente máxima (1 A). Garantiza la minimización de las pérdidas en el núcleo y el cobre (21.47 W), y errores marginales por debajo del 4% entre los valores analíticos, simulados y experimentales. En este trabajo se desarrolló una metodología holística para el óptimo diseño de inductores para aplicaciones en convertidores electrónicos de potencia. Sun, 25 Aug 2024 00:00:00 GMT http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19487 2024-08-25T00:00:00Z http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19403 Optimization and validation of the preconcentration technique with SBSE coupled HPLC-UV/DAD for the identification of atrazine and two of its metabolites: 2-Hydroxyatrazine (2-HA) and Desethylatrazine (DEA) in aqueous samples García Villanueva, Luis Antonio; Fernández Villagómez, Georgina; Andraca Ayala, Gema Luz; Yáñez Campuzano, José Mauricio; Zamora Martínez, Olivia; Martínez Castro, Juan Ramón Agriculture is the science of cultivating the land to obtain raw materials. The main reasons that have led to agricultural production have been to solve the problem of world hunger through the extensive use of agricultural practices (Carmona 2004). Mexico uses 76% of its renewable water for agriculture, which mainly produces sugarcane, corn and sorghum. During its cultivation, atrazine has been found to be used as a pesticide for weed control. Studies worldwide consider atrazine as an endocrine disruptor, even low doses of pesticides can alter the biochemical profile, resulting in oxidative stress within the population’s brains causing hormonal imbalance and is classified as a carcinogenic substance, it also represents various risks to the aquatic environment and its propagation in it, so it has been banned in some countries (CICOPLAFEST 2005, IARC 2014, Sharma et al 2023). There are studies where residual pesticides are detected in soil, water, food, biological fluids and tissue samples. In food, different pesticides have been found in cereal grains, cactus, shrimp, vegetable oils, tomato, grapes, among others (Ahmed et al. 2009, Aldana et al. 2008, Alsayeda et al. 2008). Hence the interest in studying the persistence of pesticides in the environment. Atrazine is one of the most widely used pesticides in the world and Mexico is the second country where it is used in the greatest quantity, and where there is no law prohibiting or regulating its use. It should be noted that some Mexican standards provide maximum permissible limits in a preventive manner, mainly those referring to drinking water, wastewater discharges and food (Bello 2016, FAO 2016, González-Márquez & Hansen 2009). In the practice of chemical analysis there are countless reasons to perform tests, measurements and examinations in laboratories worldwide, for example, to control the quality of drinking and irrigation water, food, medical analysis, high value-added products among many others, which require high reliability since important decisions depend on the results that these measurements produce (Eurolab 2016). That is why it is considered necessary that the methods of analysis, as well as the analytical results are subjected to some acceptance criterion that allows them to document their quality and verify that the experimental procedures meet the quality criteria requested by the customer and are suitable for the specific use for which they were developed. This procedure is known as method validation and is applied by countless laboratories around the world (CDER 1994). The purpose of this work is to address an environmental problem in Mexico, which uses significant amounts of water for agricultural activities, where atrazine is frequently used as a pesticide for weed control. Currently there is no law prohibiting its use, despite the fact that it is considered an endocrine disruptor in some mammals and harmful to health. Due to the difficulty in the direct quantification of several herbicides, which present a low concentration in water, the present work aims to develop the optimization and validation of the preconcentration with magnetic stir bars (SBSE) in aqueous samples for the quantification of atrazine and two of its metabolites: 2-hydroxyatrazine (2-HA) and desethylatrazine (DEA), coupled to High Performance Liquid Chromatography (HPLC-UV/DAD). For the optimization of the preconcentration technique, the nature and quantity of the solvents used in each step, contact time for retention and quantitative extraction of the analyte, as well as the effect of the concentration of the analyte on its retention on the bar were considered. Finally, it was determined that the presence of the metabolites 2-HA and DEA does not affect the sorption of atrazine on the sorption bar used. The analytical methodology can be considered as an efficient method of atrazine preconcentration for subsequent quantification via HPLC-UV/DAD in the range of 0.03 to 0.25 mg/L and in the absence of matrix interferences; its limits of detection and quantification are respectively 0.0014 mg/L and 0.0016 mg/L. http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19403 http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19331 Evaluation of the efficiency of coffee mucilage as an organic coagulant for the removal of turbidity, considering the optimal pH and optimal dosage Bello Segura, Gibrán; Banda Santamaría, Santiago; García Villanueva, Luis Antonio The urgent need to satisfy the demand of water for human use and consumption with a sustainable approach makes it necessary to look for new alternatives for the removal of turbidity in this environmental matrix. Therefore, the present work aims to evaluate the efficiency of coffee mucilage as an organic coagulant,for turbidity removal. Considering the pH and optimal dose. Jar tests were conducted, and the concentration of coffee mucilage was determined using samples collected from different extraction methods. The optimal pH for turbidity removal was found to be 11 and 12 with the optimal dose of 10 and 20 ml of coffee mucilage as coagulant. It is proved that coffee mucilage organic coagulant is an effective and viable option for turbidity removal in synthetic water, achieving removal efficiencies of 91.38% at pH 12 and 90.99% at pH 11. This study explores using coffee mucilage as an organic coagulant for turbidity removal in water. Optimal turbidity removal was achieved at pH levels 11 and 12, with doses of 10 and 20 ml, reaching efficiencies of over 90%. The findings suggest that coffee mucilage is an effective and sustainable option for water treatment. Wed, 27 Sep 2023 00:00:00 GMT http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19331 2023-09-27T00:00:00Z http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19163 Choice of Remediation Technology for a Contaminated Soil by 1,2-Dichloroethane (DCA) González Herrera, Carlos Raúl In the case study, landfills were identified where 1,2-dichloroethane was stored, generating contaminated soil in this location, even affecting subway water bodies. The purpose of this work is to identify the best technology for site remediation, which is "Soil Vapor Extraction", being the most ideal and efficient in terms of time and cost, and generating a high impact remediation outcome. The aim of this work is to identify the technologies for the remediation of contaminated soils, taking into account the affected site, the characteristics of the residue, costs and time, in order to determine the most effective and ideal technology. Wed, 27 Dec 2023 00:00:00 GMT http://www.ptolomeo.unam.mx:8080/xmlui/handle/RepoFi/19163 2023-12-27T00:00:00Z