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This descriptive study intends to identify the satisfaction perception among the teachers of the Universidad del Valle de México (UVM) concerning the use of the Microsoft Teams platform in the transition from traditional model (face-to-face) to 100% online education [Emergency Remote Teaching (ERT)]. The proposal aims to determine the perspectives of teachers regarding the use of the Microsoft Teams platform during the crisis caused by COVID-19. UVM has 6938 full-time teachers and part-time teachers who collaborated in educational programs during January-June 2020 in the 33 campuses of UVM. And an instrument was developed and applied using finite population sampling, UVM perspective of teachers, which was distributed via Google Forms. The feasibility of the data collection instrument was determined by the Cronbach’s Alpha coefficient, with a result of 0.926. The data collection period was aligned with the first isolation period: 23 March to 20 April. The results in the perception of teacher satisfaction in the different sections of the instrument established an agreement in the answers (very satisfied or satisfied) regarding values that were higher than 60% in terms of satisfaction using the equipment. The analysis of the data collected was performed to verify the proposed hypothesis with the R version 4.0 software. A G-test was performed with the Logverosimilitude coefficient to test whether the categorical variables were independent (qualitative variables that are not defined continuously). The Krammer coefficient of association was then calculated to measure the correlation.
Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Leticia Rodriguez Segura; Miguel Cruz Pérez; José Altamirano Corro; Wilfrido Paredes-Garcia; Hugo Rodríguez-Reséndiz. Analysis of Emergency Remote Education in COVID-19 Crisis Focused on the Perception of the Teachers. Sustainability 2021, 13, 3820 .
AMA StyleMarco Zamora-Antuñano, Juvenal Rodríguez-Reséndiz, Leticia Rodriguez Segura, Miguel Cruz Pérez, José Altamirano Corro, Wilfrido Paredes-Garcia, Hugo Rodríguez-Reséndiz. Analysis of Emergency Remote Education in COVID-19 Crisis Focused on the Perception of the Teachers. Sustainability. 2021; 13 (7):3820.
Chicago/Turabian StyleMarco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Leticia Rodriguez Segura; Miguel Cruz Pérez; José Altamirano Corro; Wilfrido Paredes-Garcia; Hugo Rodríguez-Reséndiz. 2021. "Analysis of Emergency Remote Education in COVID-19 Crisis Focused on the Perception of the Teachers." Sustainability 13, no. 7: 3820.
Delta-Processing (DP) is a suitable heat treatment process aiming at controlling grain growth during hot deformation of the well-known Ni-base superalloy Inconel 718 (IN718). DP is often applied by heating up to 900 °C for 24 h in order to promote δ-phase saturation prior to deformation. In addition to the δ-phase, Mo and Cr-rich carbides in the form of M23C6 may also precipitate during the subsequent hot deformation of this alloy in the range of 950–1000 °C These carbides are induced by deformation and can affect the static and dynamic recrystallization of the matrix. The objective of the current work is to understand the precipitation of M23C6 carbides when the material has been saturated with δ-phase precipitation, as well as their interaction with recrystallization phenomena. For this purpose, a series of double-strain hot compression test (double-hit) were carried out. Several holding times were applied between the first and the second hit in order to derive the softening/hardening fraction progress with time. Microstructural characterization of the samples was performed through Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD) in order to identify the precipitating/dissolving phases under each testing condition.
Pedro Jacinto Páramo-Kañetas; Utkudeniz Ozturk; Jessica Calvo; Martha Patricia Guerrero-Mata; Marco Antonio Zamora-Antuñano; José María Cabrera-Marrero. Analysis of strain-induced precipitates by delta-processing in Inconel 718 superalloy. Materials Characterization 2021, 173, 110926 .
AMA StylePedro Jacinto Páramo-Kañetas, Utkudeniz Ozturk, Jessica Calvo, Martha Patricia Guerrero-Mata, Marco Antonio Zamora-Antuñano, José María Cabrera-Marrero. Analysis of strain-induced precipitates by delta-processing in Inconel 718 superalloy. Materials Characterization. 2021; 173 ():110926.
Chicago/Turabian StylePedro Jacinto Páramo-Kañetas; Utkudeniz Ozturk; Jessica Calvo; Martha Patricia Guerrero-Mata; Marco Antonio Zamora-Antuñano; José María Cabrera-Marrero. 2021. "Analysis of strain-induced precipitates by delta-processing in Inconel 718 superalloy." Materials Characterization 173, no. : 110926.
Nickel-based superalloys are extensively used in the aerospace and power generation industries due to their excellent mechanical properties at elevated temperatures and good corrosion resistance. Typically, these alloys require accomplishing critical standards during their manufacturing process. In this study, an Inconel 718 (IN718) Ni-based superalloy was subjected to a delta-processing treatment (DP718) and subsequently deformed at high temperature. Samples were compressed below and above the δ-solvus temperature at two different strain rates of 0.001 s−1 and 0.01 s−1. A detailed microstructural characterization was carried out by the electron backscattered diffraction technique (EBSD). Kikuchi patterns and the orientation relationship of the δ-phase were identified. For samples deformed above the δ-solvus at 0.01 s−1, an increase in the percentage of low angle grain boundaries (LAGB) within deformed grains and a decrease in high angle grain boundaries (HAGB) were observed. Comprehensive observation of the microstructural evolution of IN718 subjected to DP718 using orientation map images was also performed.
Pedro Jacinto Páramo Kañetas; Jessica Calvo; Pablo Rodriguez-Calvillo; José María Cabrera Marrero; Marco Antonio Zamora Antuñano; Martha Patricia Guerrero-Mata. EBSD Study of Delta-Processed Ni-Based Superalloy. Metals 2020, 10, 1466 .
AMA StylePedro Jacinto Páramo Kañetas, Jessica Calvo, Pablo Rodriguez-Calvillo, José María Cabrera Marrero, Marco Antonio Zamora Antuñano, Martha Patricia Guerrero-Mata. EBSD Study of Delta-Processed Ni-Based Superalloy. Metals. 2020; 10 (11):1466.
Chicago/Turabian StylePedro Jacinto Páramo Kañetas; Jessica Calvo; Pablo Rodriguez-Calvillo; José María Cabrera Marrero; Marco Antonio Zamora Antuñano; Martha Patricia Guerrero-Mata. 2020. "EBSD Study of Delta-Processed Ni-Based Superalloy." Metals 10, no. 11: 1466.
At the onset of the crisis caused by COVID-19, the Mexican education system chose to join the global context and suspend face-to-face classes for all educational levels. For the continuity of educational processes, a transition from a traditional educational model (face-to-face) to emergency remote teaching (ERT) was made through virtual learning platforms and learning management system (LMS) schemes. Universidad del Valle de Mexico (UVM), in a collaboration agreement with Microsoft Co., chose to use Teams to continue its educational process. In this work, we intend to identify the factors that can be taken into account regarding the level of student satisfaction in the teaching–learning process in ERT using Teams, and validate the established educational strategy. Statistical analysis was carried out to analyze the academic environment for these scenario changes while considering knowledge assessment, and competencies achievement. A combined sampling method was applied with convenience and statistical analysis. The main results established significant percentages, where more than 60% of the students surveyed were manifested in the use of the teams and the organization of the class sessions by the teachers, and the activities developed. Using the Cronbach’s Alpha coefficient, the reliability of the data collection instruments was determined. The correlations of each of the survey questions were calculated to determine the relationship between themselves and the total answers, giving results similar to those obtained through data science tools. Taking advantage of the situation, data science tools were applied to compare the results with obtained values from RapidMiner software in the correlation of factors in of 0.440, 0.384, 0.246, 0.048 and 0.384.
Leticia Rodriguez-Segura; Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Wilfrido Paredes-García; Antonio Altamirano-Corro; Miguel Cruz-Pérez. Teaching Challenges in COVID-19 Scenery: Teams Platform-Based Student Satisfaction Approach. Sustainability 2020, 12, 7514 .
AMA StyleLeticia Rodriguez-Segura, Marco Zamora-Antuñano, Juvenal Rodríguez-Reséndiz, Wilfrido Paredes-García, Antonio Altamirano-Corro, Miguel Cruz-Pérez. Teaching Challenges in COVID-19 Scenery: Teams Platform-Based Student Satisfaction Approach. Sustainability. 2020; 12 (18):7514.
Chicago/Turabian StyleLeticia Rodriguez-Segura; Marco Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Wilfrido Paredes-García; Antonio Altamirano-Corro; Miguel Cruz-Pérez. 2020. "Teaching Challenges in COVID-19 Scenery: Teams Platform-Based Student Satisfaction Approach." Sustainability 12, no. 18: 7514.
Currently, the use of sustainable chemistry as an ecological alternative for the generation of products or processes that are free of a polluting substance has assumed a preponderant role. The aim of this work is to propose a bioinspired, facile, low cost, non-toxic, and environmentally friendly alternative to obtaining magnetic nanoparticles with a majority phase of magnetite (Fe3O4). It is important to emphasize that the synthesis was based on the chemical reduction through the Cnicus benedictus extract, whose use as reducing agent has not been reported in the synthesis of iron oxides nanoparticles. In addition, the Cnicus benedictus is an abundant endemic plant in Mexico with several medicinal properties and a large number of natural antioxidants. The obtained nanoparticles exhibited significant magnetic and antibacterial properties and an enhanced photocatalytic activity. The crystallite size of the Fe3O4 nanoparticles (Fe3O4 NP’s) was calculated by the Williamson-Hall method. The photocatalytic properties of the Fe3O4 NP’s were studied by kinetics absorptions models in the Congo red (CR) degradation. Finally, the antibacterial effects of the Fe3O4 NPs were evaluated mediated the Kirby–Bauer method against Escherichia coli and Staphylococcus aureus bacteria. This route offers a green alternative to obtain Fe3O4 NPs with remarkable magnetic, photocatalytic, and antibacterial properties.
Álvaro De Jesús Ruíz - Baltazar; Nestor Méndez-Lozano; Daniel Larrañaga-Ordáz; Simón Yobanny Reyes-López; Marco Antonio Zamora Antuñano; Ramiro Pérez Campos. Magnetic Nanoparticles of Fe3O4 Biosynthesized by Cnicus benedictus Extract: Photocatalytic Study of Organic Dye Degradation and Antibacterial Behavior. Processes 2020, 8, 946 .
AMA StyleÁlvaro De Jesús Ruíz - Baltazar, Nestor Méndez-Lozano, Daniel Larrañaga-Ordáz, Simón Yobanny Reyes-López, Marco Antonio Zamora Antuñano, Ramiro Pérez Campos. Magnetic Nanoparticles of Fe3O4 Biosynthesized by Cnicus benedictus Extract: Photocatalytic Study of Organic Dye Degradation and Antibacterial Behavior. Processes. 2020; 8 (8):946.
Chicago/Turabian StyleÁlvaro De Jesús Ruíz - Baltazar; Nestor Méndez-Lozano; Daniel Larrañaga-Ordáz; Simón Yobanny Reyes-López; Marco Antonio Zamora Antuñano; Ramiro Pérez Campos. 2020. "Magnetic Nanoparticles of Fe3O4 Biosynthesized by Cnicus benedictus Extract: Photocatalytic Study of Organic Dye Degradation and Antibacterial Behavior." Processes 8, no. 8: 946.
Although hydrogen is the most abundant element in the universe, it is not possible to find it in its purest state in nature. In this study, two-stage experimentation was carried out. The first stage was hydrogen production. The second stage was an electrochemical process to hydrogenate soybean oil in a PEM fuel cell. In the fist stage a Zirfon Perl UTP 500 membrane was used in an alkaline hydrolizer of separated gas to produce hydrogen, achieving 9.6 L/min compared with 5.1 L/min, the maximum obtained using a conventional membrane. The hydrogen obtained was used in the second stage to feed the fuel cell hydrogenating the soybean oil. Hydrogenated soybean oil showed a substantial diminished iodine index from 131 to 54.85, which represents a percentage of 58.13. This happens when applying a voltage of 90 mV for 240 min, constant temperature of 50 ∘ C and one atm. This result was obtained by depositing 1 mg of Pt/cm 2 in the cathode of the fuel cell. This system represents a viable alternative for the use of hydrogen in energy generation.
Jorge Eduardo Esquerre Verastegui; Marco Antonio Zamora Antuñano; Juvenal Rodríguez Resendiz; Raul García García; Pedro Jacinto Paramo Kañetas; Daniel Larrañaga Ordaz. Electrochemical Hydrogen Production Using Separated-Gas Cells for Soybean Oil Hydrogenation. Processes 2020, 8, 832 .
AMA StyleJorge Eduardo Esquerre Verastegui, Marco Antonio Zamora Antuñano, Juvenal Rodríguez Resendiz, Raul García García, Pedro Jacinto Paramo Kañetas, Daniel Larrañaga Ordaz. Electrochemical Hydrogen Production Using Separated-Gas Cells for Soybean Oil Hydrogenation. Processes. 2020; 8 (7):832.
Chicago/Turabian StyleJorge Eduardo Esquerre Verastegui; Marco Antonio Zamora Antuñano; Juvenal Rodríguez Resendiz; Raul García García; Pedro Jacinto Paramo Kañetas; Daniel Larrañaga Ordaz. 2020. "Electrochemical Hydrogen Production Using Separated-Gas Cells for Soybean Oil Hydrogenation." Processes 8, no. 7: 832.
Currently, the use of sustainable chemistry as an ecological alternative for the generation of products or processes, free of polluting substance has assumed a preponderant role. The aim of this work is propose a bioinspired, facile, at low cost, non-toxic and environmentally friendly alternative to obtaining magnetic nanoparticles whit a majority phase of magnetite (Fe3O4). Is important to empathize that the synthesis was based on the chemical reduction through the Cnicus Benedictus extract, whose use as reducing agent has not been reported in the synthesis of iron oxides nanoparticles. In addition, the Cnicus Benedictus is abundant endemic plant in Mexico, with several medicinal properties and a large number of natural antioxidants. The obtained nanoparticles exhibited significant magnetic and antibacterial properties and an enhanced photocatalytic activity. The crystallite size of the Fe3O4 nanoparticles (Fe3O4 NP’s) was calculated by Williamson-Hall method. The photocatalytic properties of the Fe3O4 NP´s were studied by kinetics absorptions models in the Congo red (CR) degradation. Finally the antibacterial effect of the Fe3O4 NP´s were evaluated mediated the Kirby-Bauer method against E. coli and S. aureus bacteria. This route offers a green alternative to obtain Fe3O4 NP´s with remarkable magnetic, photocatalytic and antibacterial properties.
Álvaro De Jesús Ruíz-Baltazar; Simón Yobanny Reyes-López; Daniel Larrañaga-Ordáz; Nestor Méndez-Lozano; Marco Antonio Zamora-Antuñano; Ramiro Perez. Magnetic Nanoparticles of Fe3O4 Biosynthesized by Cnicus Benedictus Extract: Photocatalytic Study of Organic Dye Degradation and Antibacterial Behavior. 2020, 1 .
AMA StyleÁlvaro De Jesús Ruíz-Baltazar, Simón Yobanny Reyes-López, Daniel Larrañaga-Ordáz, Nestor Méndez-Lozano, Marco Antonio Zamora-Antuñano, Ramiro Perez. Magnetic Nanoparticles of Fe3O4 Biosynthesized by Cnicus Benedictus Extract: Photocatalytic Study of Organic Dye Degradation and Antibacterial Behavior. . 2020; ():1.
Chicago/Turabian StyleÁlvaro De Jesús Ruíz-Baltazar; Simón Yobanny Reyes-López; Daniel Larrañaga-Ordáz; Nestor Méndez-Lozano; Marco Antonio Zamora-Antuñano; Ramiro Perez. 2020. "Magnetic Nanoparticles of Fe3O4 Biosynthesized by Cnicus Benedictus Extract: Photocatalytic Study of Organic Dye Degradation and Antibacterial Behavior." , no. : 1.
This paper focuses on the numerical modeling of the effect of the height of a combustion chamber on the development of a reference calorimeter whose objective is to measure the calorific value of natural gas. The impacts of temperature, velocity, and mass fraction on the exhaust gases were evaluated by varying the height of the combustion chamber. The eddy dissipation concept (EDC) approach was used to model combustion with two different chemical kinetic mechanisms: one with three steps, called the three-step mechanism defined by default in the software used, and second skeletal model, which consists of 41 steps, through the ChemKin-import file with 16 species. The main result of this study is the selection of a combustion chamber height for the reference calorimeter that produces the best performance in the combustion process, which is 70 mm, as well as the main differences in using a three-step mechanism and a skeletal model to simulate an oxy-fuel combustion reaction.
José Eli Eduardo González-Durán; Marco Antonio Zamora-Antuñano; Leonel Lira-Cortés; Juvenal Rodríguez-Reséndiz; Juan Manuel Olivares-Ramírez; Néstor Efrén Méndez Lozano. Numerical Simulation for the Combustion Chamber of a Reference Calorimeter. Processes 2020, 8, 575 .
AMA StyleJosé Eli Eduardo González-Durán, Marco Antonio Zamora-Antuñano, Leonel Lira-Cortés, Juvenal Rodríguez-Reséndiz, Juan Manuel Olivares-Ramírez, Néstor Efrén Méndez Lozano. Numerical Simulation for the Combustion Chamber of a Reference Calorimeter. Processes. 2020; 8 (5):575.
Chicago/Turabian StyleJosé Eli Eduardo González-Durán; Marco Antonio Zamora-Antuñano; Leonel Lira-Cortés; Juvenal Rodríguez-Reséndiz; Juan Manuel Olivares-Ramírez; Néstor Efrén Méndez Lozano. 2020. "Numerical Simulation for the Combustion Chamber of a Reference Calorimeter." Processes 8, no. 5: 575.
This research obtains a mathematical formulation to determine the heat transfer in a transient state, in a calorimeter cell, considering an adiabatic system. The development of the cell was established and the mathematical model was transiently solved, which approximated the physical phenomenon under the cell operation. A numerical method for complex geometries was used to validate performance. The results obtained in the transient heat transfer in a cylinder under boundary and initial conditions were compared using an analytical solution and numerical analysis employing the finite-element method with commercial software. The study from the temperature distribution can afford, selection between a cylindrical and spherical geometry, design criteria that are generated by changing parameters such as dimension, temperature, and working fluids to develop an adiabatic calorimeter to measure the heat capacity in fluids. We show the mathematical solution with its initial and boundary conditions as well as a comparison with a numerical solution for a cylindrical cell with a maximum error from 0.075% in the temperature value, along with a theoretical and numerical analysis for a temperature difference of 1 °C.
José Eli Eduardo González-Durán; Juvenal Rodríguez-Reséndiz; Juan Manuel Olivares Ramirez; Marco Antonio Zamora-Antuñano; Leonel Lira-Cortes. Finite-Element Simulation for Thermal Modeling of a Cell in an Adiabatic Calorimeter. Energies 2020, 13, 2300 .
AMA StyleJosé Eli Eduardo González-Durán, Juvenal Rodríguez-Reséndiz, Juan Manuel Olivares Ramirez, Marco Antonio Zamora-Antuñano, Leonel Lira-Cortes. Finite-Element Simulation for Thermal Modeling of a Cell in an Adiabatic Calorimeter. Energies. 2020; 13 (9):2300.
Chicago/Turabian StyleJosé Eli Eduardo González-Durán; Juvenal Rodríguez-Reséndiz; Juan Manuel Olivares Ramirez; Marco Antonio Zamora-Antuñano; Leonel Lira-Cortes. 2020. "Finite-Element Simulation for Thermal Modeling of a Cell in an Adiabatic Calorimeter." Energies 13, no. 9: 2300.
The Centro Nacional de Metrología is developing a reference calorimeter to measure the superior calorific value of natural gas in collaboration with the Instituto Tecnológico de Celaya. We present the study of the combustion chamber for two formulations a steady state (already published) against the transient state. The study of the combustion chamber is performed employing computational fluid dynamics (CFD) through FLUENT®. For this work, specific parameters were set to define and simulate the combustion process involving the exchange of energy, momentum and mass transfer. In this work, we present simulations performed in steady and transient state, for which was used the Eddy Dissipation Model (EDM). Is shown the simulation of two geometries for the combustion chamber; one cylindrical body a hemispherical lid and the other elliptical, which was proposed to increase the area to heat transfer to the surrounding medium, water in our case. The criterion for selection is the chamber that achieves the lowest temperature for waste combustion gases at the exit. Achieved by the cylindrical chamber with a hemispherical lid in the first 4 seconds with a difference of 0.4 °C lower than the elliptical chamber.
Eli González-Durán; Marco Zamora-Antuñano; Leonel Lira-Cortes; Nestor Méndez-Lozano. Numerical Simulation of the Combustion Chamber for a New Reference Combustion Calorimeter. Journal of Research and Development 2019, 12 -20.
AMA StyleEli González-Durán, Marco Zamora-Antuñano, Leonel Lira-Cortes, Nestor Méndez-Lozano. Numerical Simulation of the Combustion Chamber for a New Reference Combustion Calorimeter. Journal of Research and Development. 2019; ():12-20.
Chicago/Turabian StyleEli González-Durán; Marco Zamora-Antuñano; Leonel Lira-Cortes; Nestor Méndez-Lozano. 2019. "Numerical Simulation of the Combustion Chamber for a New Reference Combustion Calorimeter." Journal of Research and Development , no. : 12-20.
Analyses were developed using a finite element method of the experimental measurement system for thermal conductivity of solid materials, used by the Centro Nacional de Metrología (CENAM), which operates under a condition of permanent heat flow. The CENAM implemented a thermal conductivity measurement system for solid materials limited in its operating intervals to measurements of maximum 300 ° C for solid conductive materials. However, the development of new materials should be characterised and studied to know their thermophysical properties and ensure their applications to any temperature conditions. These task demand improvements in the measurement system, which are proposed in the present work. Improvements are sought to achieve high-temperature measurements in metallic materials and conductive solids, and this system may also cover not only metallic materials. Simulations were performed to compare the distribution of temperatures developed in the measurement system as well as the radial heat leaks, which affect the measurement parameters for an aluminium bar, and uses copper bars as reference material. The simulations were made for measurements of an aluminium bar at a temperature of 150 ° C, in the plane and 3D, another at 175 ° C and one more known maximum temperature reached by a sample of the aluminium bar with a new heater acquired at 310 ° C.
José Eli Eduardo Gonzalez Duran; Oscar J. González-Rodríguez; Marco Antonio Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Néstor Méndez-Lozano; Domingo José Gómez Meléndez; Raul García García. Finite Element Method and Cut Bar Method-Based Comparison Under 150°, 175° and 310 °C for an Aluminium Bar. Applied Sciences 2019, 10, 296 .
AMA StyleJosé Eli Eduardo Gonzalez Duran, Oscar J. González-Rodríguez, Marco Antonio Zamora-Antuñano, Juvenal Rodríguez-Reséndiz, Néstor Méndez-Lozano, Domingo José Gómez Meléndez, Raul García García. Finite Element Method and Cut Bar Method-Based Comparison Under 150°, 175° and 310 °C for an Aluminium Bar. Applied Sciences. 2019; 10 (1):296.
Chicago/Turabian StyleJosé Eli Eduardo Gonzalez Duran; Oscar J. González-Rodríguez; Marco Antonio Zamora-Antuñano; Juvenal Rodríguez-Reséndiz; Néstor Méndez-Lozano; Domingo José Gómez Meléndez; Raul García García. 2019. "Finite Element Method and Cut Bar Method-Based Comparison Under 150°, 175° and 310 °C for an Aluminium Bar." Applied Sciences 10, no. 1: 296.
In this work, we present the synthesis of thin films of TiO2 doped with cobalt using the MOCVD technique, allowing the growth of coatings with controlled morphology and a faster deposit speed, as compared to other techniques. In addition, the synthesis parameters necessary for the reproducibility of the films were obtained. Anatase thin films doped with cobalt were prepared by the Metal Organic Chemical Vapor Deposition technique working in pulsed injection mode using a mixture of titanium (IV) isopropoxide and acetyl acetonate of cobalt at different concentrations as the precursor. The films were deposited on silicon (100) substrates at temperature of 650 °C. The crystalline structure of the deposited films was characterized by X-ray diffraction (XRD) and Raman spectroscopy. The characteristic XRD peaks and vibrational modes of TiO2 corresponding to the anatase phase were observed in all cases, without any secondary or mixed phase. On the other hand, the scanning electron microscopy (SEM) observations show that the film surfaces are formed by a higher number of porous, which are characteristic of the anatase films and the corresponding Energy Dispersion Spectroscopy (EDS) shows the elemental composition.
Néstor Méndez-Lozano; Miguel Apátiga-Castro; Alejandro Manzano-Ramírez; Eric M. Rivera-Muñoz; Rodrigo Velázquez-Castillo; Carlos Alberto-González; Marco Antonio Zamora Antuñano. Morphological study of TiO₂ thin films doped with cobalt by Metal Organic Chemical Vapor Deposition. Results in Physics 2019, 16, 102891 .
AMA StyleNéstor Méndez-Lozano, Miguel Apátiga-Castro, Alejandro Manzano-Ramírez, Eric M. Rivera-Muñoz, Rodrigo Velázquez-Castillo, Carlos Alberto-González, Marco Antonio Zamora Antuñano. Morphological study of TiO₂ thin films doped with cobalt by Metal Organic Chemical Vapor Deposition. Results in Physics. 2019; 16 ():102891.
Chicago/Turabian StyleNéstor Méndez-Lozano; Miguel Apátiga-Castro; Alejandro Manzano-Ramírez; Eric M. Rivera-Muñoz; Rodrigo Velázquez-Castillo; Carlos Alberto-González; Marco Antonio Zamora Antuñano. 2019. "Morphological study of TiO₂ thin films doped with cobalt by Metal Organic Chemical Vapor Deposition." Results in Physics 16, no. : 102891.
The main focus of this research was to develop an approach using statistical tools and Data envelopment analysis (DEA) to tackling productivity measurements and benchmarking problems in electrical conductor manufacturing environment. In the present work, a tooling efficiency study was carried out with a nozzle used for the manufacture of 23-AWG wires. The efficiency of five types of tooling, four non-Mexican-manufactured types and one Mexican-manufactured type, were compared. Analysis of Variance (ANOVA) and the Tukey test were applied. Six factors were considered that influence of the performance of the tooling during the manufacturing process: productivity, quality, time, machine, operator, and color of the insulating material, but the research work focuses on the efficiency of the tooling die-nozzle. The results demonstrated that two die-nozzle models exhibited the best performance; one of them was the Mexican model, surpassed by a non-Mexican model, the capability process index Cpk = 1.26 manifested a better performance for the 3DND die-nozzle according to the statistical analysis and the tests performed. Subsequently, through a super-efficiency DEA model of inputs-oriented with non-decreasing returns to scale (NDRS). The results obtained in the statistical analysis were corroborated using this technique, its application combined with statistical tools represents an innovation for knowledge in manufacturing processes of electrical conductors. Input data were obtained at a manufacturer of electrical conductors supplier of the automotive sector in the Querétaro City of Mexico.
Marco Antonio Zamora-Antuñano; Jorge Cruz-Salinas; Juvenal Rodríguez-Reséndiz; Carlos Alberto González-Gutiérrez; Néstor Méndez-Lozano; Wilfrido Jacobo Paredes-García; José Antonio Altamirano-Corro; José Alfredo Gaytán-Díaz. Statistical Analysis and Data Envelopment Analysis to Improve the Efficiency of Manufacturing Process of Electrical Conductors. Applied Sciences 2019, 9, 3965 .
AMA StyleMarco Antonio Zamora-Antuñano, Jorge Cruz-Salinas, Juvenal Rodríguez-Reséndiz, Carlos Alberto González-Gutiérrez, Néstor Méndez-Lozano, Wilfrido Jacobo Paredes-García, José Antonio Altamirano-Corro, José Alfredo Gaytán-Díaz. Statistical Analysis and Data Envelopment Analysis to Improve the Efficiency of Manufacturing Process of Electrical Conductors. Applied Sciences. 2019; 9 (19):3965.
Chicago/Turabian StyleMarco Antonio Zamora-Antuñano; Jorge Cruz-Salinas; Juvenal Rodríguez-Reséndiz; Carlos Alberto González-Gutiérrez; Néstor Méndez-Lozano; Wilfrido Jacobo Paredes-García; José Antonio Altamirano-Corro; José Alfredo Gaytán-Díaz. 2019. "Statistical Analysis and Data Envelopment Analysis to Improve the Efficiency of Manufacturing Process of Electrical Conductors." Applied Sciences 9, no. 19: 3965.
In this work, a physical and numerical simulation of cathodic current for different designs of the channel distribution in PEM fuel cells was carried out. The first design consisted serpentine-type channels with abrupt changes in flow direction. On the other hand, Designs 2 and 3 were made of serpentine channels with a more gradual change in flow direction. The fourth design was a crisscross-type channel, which was based on continually redirecting the flow, while Design 5 was made with straight parallel channels. Designs 1–3 had one intake, while Designs 4 and 5 had three. The latter two produced more uniform electrical current distributions than Designs 1–3. It can be concluded that the intakes situated effectively within each design were as important as the shape of the channel configuration. Finally, the parallel channel flow field (Design 5) was the best alternative for current collectors due to its better performance.
Marco Antonio Zamora-Antuñano; Pablo Esaú Orozco Pimentel; Germán Orozco-Gamboa; Raul Garcia Garcia; Juan Manuel Olivares Ramírez; Edrei Reyes Santos; Álvaro De Jesús Ruiz Baltazar. Flow Analysis Based on Cathodic Current Using Different Designs of Channel Distribution In PEM Fuel Cells. Applied Sciences 2019, 9, 3615 .
AMA StyleMarco Antonio Zamora-Antuñano, Pablo Esaú Orozco Pimentel, Germán Orozco-Gamboa, Raul Garcia Garcia, Juan Manuel Olivares Ramírez, Edrei Reyes Santos, Álvaro De Jesús Ruiz Baltazar. Flow Analysis Based on Cathodic Current Using Different Designs of Channel Distribution In PEM Fuel Cells. Applied Sciences. 2019; 9 (17):3615.
Chicago/Turabian StyleMarco Antonio Zamora-Antuñano; Pablo Esaú Orozco Pimentel; Germán Orozco-Gamboa; Raul Garcia Garcia; Juan Manuel Olivares Ramírez; Edrei Reyes Santos; Álvaro De Jesús Ruiz Baltazar. 2019. "Flow Analysis Based on Cathodic Current Using Different Designs of Channel Distribution In PEM Fuel Cells." Applied Sciences 9, no. 17: 3615.
In this research, we investigated the development and design of the Accelerated Life Test (ALT) and its approach to the waste of material. The development of a reliability model is based on the moment at which failure appears. The faults detected in welding joints during this research prevented proper current flow within electronic components and this interruption of current is considered a critical system failure. Minitab v18 was used to process data. Through statistical analysis, it was determined that the sample size was adequate with a 95% level of significance. A Shapiro Wilk analysis was carried out to determine the normality of the data, where a p-value of 0.1349 was obtained, which indicates that the data are normal. A Weibull analysis was applied, and it was observed that the data adjusted to the regression analysis and Weibull’s reliability distribution. The results showed that failure phenomena can occur during electronic assembly due to the values of R being too high and too close to each other. Significant issues included the welding alloy, temperature, and the interaction between the welding alloy and vibration. It is observed that with high temperature, the number of faults in the solder alloy used for tin and lead and for tin, silver, and copper were lower. 17 electronic assemblies with measures of 2 cm × 2 cm were fabricated, where components such as leads and electric resistance were used. The objective of analyzing this is to obtain the characteristics of the soldering alloy. Electronic components of this type are used worldwide in all types of electronic components, including: TVs, cell phones, tablet, computers, resistors, diodes, LEDs, and capacitors. For this work, the components were built based on an LED and a diode.
M.A. Zamora-Antuñano; O. Mendoza-Herbert; M. Culebro-Pérez; A. Rodríguez-Morales; Juvenal Rodríguez-Reséndiz; J.E.E. Gonzalez-Duran; N. Mendez-Lozano; Carlos Alberto González Gutiérrez. Reliable Method to Detect Alloy Soldering Fractures under Accelerated Life Test. Applied Sciences 2019, 9, 3208 .
AMA StyleM.A. Zamora-Antuñano, O. Mendoza-Herbert, M. Culebro-Pérez, A. Rodríguez-Morales, Juvenal Rodríguez-Reséndiz, J.E.E. Gonzalez-Duran, N. Mendez-Lozano, Carlos Alberto González Gutiérrez. Reliable Method to Detect Alloy Soldering Fractures under Accelerated Life Test. Applied Sciences. 2019; 9 (16):3208.
Chicago/Turabian StyleM.A. Zamora-Antuñano; O. Mendoza-Herbert; M. Culebro-Pérez; A. Rodríguez-Morales; Juvenal Rodríguez-Reséndiz; J.E.E. Gonzalez-Duran; N. Mendez-Lozano; Carlos Alberto González Gutiérrez. 2019. "Reliable Method to Detect Alloy Soldering Fractures under Accelerated Life Test." Applied Sciences 9, no. 16: 3208.
S. Martínez-Martínez; S.A. Mayén-Hernández; F. de Moure-Flores; Ma. Concepción Arenas-Arrocena; Enrique Campos-Gonzalez; Marco Antonio Zamora Antuñano; V.M. Arellano-Badillo; J. Santos-Cruz. Sulfiding effects on ZnS thin films obtained by evaporation technique. Vacuum 2016, 130, 154 -158.
AMA StyleS. Martínez-Martínez, S.A. Mayén-Hernández, F. de Moure-Flores, Ma. Concepción Arenas-Arrocena, Enrique Campos-Gonzalez, Marco Antonio Zamora Antuñano, V.M. Arellano-Badillo, J. Santos-Cruz. Sulfiding effects on ZnS thin films obtained by evaporation technique. Vacuum. 2016; 130 ():154-158.
Chicago/Turabian StyleS. Martínez-Martínez; S.A. Mayén-Hernández; F. de Moure-Flores; Ma. Concepción Arenas-Arrocena; Enrique Campos-Gonzalez; Marco Antonio Zamora Antuñano; V.M. Arellano-Badillo; J. Santos-Cruz. 2016. "Sulfiding effects on ZnS thin films obtained by evaporation technique." Vacuum 130, no. : 154-158.
In this study the pressure distribution homogeneity on the catalytic surface is found to provide a simple and reliable fuel flow parameter that can be used to optimize the bipolar plate geometry and the PEM fuel cell performance. Finite element commercial ANSYS software was used to determine the fuel velocity, pressure and mass distribution on eight different bipolar plate geometries. These geometries were also fabricated and characterized experimentally in order to establish a correlation between the power densities with the fuel flow parameters obtained from the simulations. The results show that a highly uniform pressure distribution of the fuel in the bipolar plate is necessary to obtain higher power densities. Inversely, non‐homogeneous pressure distributions lead to lower power densities. Additionally, the measured power density increases when the geometry dependent effective catalytic surface area increases. These results are interesting since they provide an optimization methodology for PEM fuel cells that simplifies and reduces computing requirements, experimentation and manufacturing time.
M. A. Zamora Antuñano; A. Encinas; J. H. García-Gallegos; A. Duarte Moller; A. Marroquín De Jesús; L. G. Arriaga; J. M. Olivares Ramírez. Fuel Pressure Distribution as a Criterion for the Bipolar Plate Geometry Optimization in PEM Fuel Cells, Modeling and Experiment. Fuel Cells 2015, 15, 639 -645.
AMA StyleM. A. Zamora Antuñano, A. Encinas, J. H. García-Gallegos, A. Duarte Moller, A. Marroquín De Jesús, L. G. Arriaga, J. M. Olivares Ramírez. Fuel Pressure Distribution as a Criterion for the Bipolar Plate Geometry Optimization in PEM Fuel Cells, Modeling and Experiment. Fuel Cells. 2015; 15 (4):639-645.
Chicago/Turabian StyleM. A. Zamora Antuñano; A. Encinas; J. H. García-Gallegos; A. Duarte Moller; A. Marroquín De Jesús; L. G. Arriaga; J. M. Olivares Ramírez. 2015. "Fuel Pressure Distribution as a Criterion for the Bipolar Plate Geometry Optimization in PEM Fuel Cells, Modeling and Experiment." Fuel Cells 15, no. 4: 639-645.
J.H. García-Gallegos; J.G. Nieto-Navarro; Elsie Evelyn Araujo Palomo; M.A. Zamora-Antuñano; J.M. Olivares-Ramírez; A. Encinas. Flexible conductive films fabricated by evaporation on partially cured polydimethyl-siloxane. Materials Letters 2014, 115, 100 -102.
AMA StyleJ.H. García-Gallegos, J.G. Nieto-Navarro, Elsie Evelyn Araujo Palomo, M.A. Zamora-Antuñano, J.M. Olivares-Ramírez, A. Encinas. Flexible conductive films fabricated by evaporation on partially cured polydimethyl-siloxane. Materials Letters. 2014; 115 ():100-102.
Chicago/Turabian StyleJ.H. García-Gallegos; J.G. Nieto-Navarro; Elsie Evelyn Araujo Palomo; M.A. Zamora-Antuñano; J.M. Olivares-Ramírez; A. Encinas. 2014. "Flexible conductive films fabricated by evaporation on partially cured polydimethyl-siloxane." Materials Letters 115, no. : 100-102.