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Permanent URI for this collectionhttps://hdl.handle.net/11285/345284
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- Comparing Competency Assessment in Electronics Engineering Education with and without Industry Training Partner by Challenge-Based Learning Oriented to Sustainable Development Goals(MDPI, 2021-09-27) Gonzalez Peña, Omar Israel; Ávila Ortega, Alfonso; Dieck Assad, Graciano; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyThis study assessed the “creation of technological solutions for electronic devices” competencies evaluation when faculty–industry liaison is available. This experience at Tecnológico de Monterrey (TEC) was developed with challenge-based learning provided by the automotive electronics industry addressing subjects oriented toward some objectives of the Sustainable Development Goals (SDGs). The Electronics Engineering faculty and project engineers from automotive electronics and instrumentation companies promote design competencies in college students. This study analyzed the competency performance and outcome results of students who took applied electronics courses for the undergraduate level under the “i-Semester with industrial partner” for one semester and compared results with students that took the course under the traditional program. The competence evaluation was classified into three preliminary domain levels: 1 or low-level, 2 or medium-level, and 3 or high-level. Students were exposed to the conceptual, procedural, and attitudinal contents applied to solve the challenge assigned by the industrial partner. Students with an industrial partner showed a higher engagement, and they were more motivated in learning the subject, compared to students having classes in the traditional way. This study showed that in developing the competency “create technological solutions for electronic devices”, 55 students with an industrial partner obtained higher domain levels than 61 students with the traditional course.
- Evaluation of emergency first response’s competency in undergraduate college students: Enhancing sustainable medical education in the community for work occupational safety(MDPI, 2021-07-23) Gonzalez Peña, Omar Israel; Dieck Assad, Graciano; Rodríguez Delgado, José Manuel; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyWorldwide, people’s quality of health has been decreasing due to bad eating habits that have generated an increase in diseases such as diabetes, hypertension, overweight, as well as an increase in hours of the daily workday and stress. This situation can generate sudden illness and work accidents where the need to have knowledge in emergency first response (EFR) is necessary for all. Unfortunately, workshops and courses to certify EFR individuals are usually taught only to healthcare professionals. Therefore, to address this need a EFR project has been developed at the Tecnológico de Monterrey (TEC) which consists of a multidisciplinary challenge to train, certify, and evaluate students’ competency as “emergency first responders” in medical emergencies and healthcare awareness. This EFR project has been performed for one week, every year since 2015, and constitutes a joint venture among academic departments, faculty, and industrial/government institutions, which work together in multidisciplinary projects, providing a source of innovative proposals. The EFR project at TEC has provided instruction and certification for 966 students between 2015 to 2019 and this study has analyzed results considering a sample size of 197 participants. The combination of exam evaluation, medical emergency skills verification, and project proposal results indicate that most students reach skill levels between 2 and 3 in EFR competency after successfully completing the program, regardless of their year of study or the undergraduate program they are enrolled on. This evaluation emphasizes the compromise of the institution and its students in preparation for new living under sanitary conditions for pandemic conditions such as COVID-19.
- Mass Transfer Study on Improved Chemistry for Electrodeposition of Copper Indium Gallium Selenide (CIGS) Compound for Photovoltaics Applications(MDPI, 2021-03-06) Gonzalez Peña, Omar Israel; Saeed, Mahfouz; GONZALEZ PENA, OMAR ISRAEL; 162547; Case Western Reserve University; Instituto Tecnológico y de Estudios Superiores de MonterreyCopper indium gallium selenium (CIGS) films are attractive for photovoltaic applications due to their high optical absorption coefficient. The generation of CIGS films by electrodeposition is particularly appealing due to the relatively low capital cost and high throughput. Numerous publications address the electrodeposition of CIGS; however, very few recognize the critical significance of transport in affecting the composition and properties of the compound. This study introduces a new electrolyte composition, which is far more dilute than systems that had been previously described, which yields much improved CIGS films. The electrodeposition experiments were carried out on a rotating disk electrode, which provides quantitative control of the transport rates. Experiments with the conventional electrolyte, ten times more concentrated than the new electrolyte proposed here, yielded powdery and non-adherent deposit. By contrast, the new, low concentration electrolyte produced in the preferred potential interval of −0.64 ≤ E ≤ −0.76 V vs. NHE, a smooth and adherent uniform deposit with the desired composition across a broad range of rotation speeds. The effects of mass transport on the deposit are discussed. Sample polarization curves at different electrode rotation rates, obtained in deposition experiments from the high and the low concentration electrolytes, are critically compared. Characterization of the overall efficiency, quantum efficiency, open circuit voltage, short circuit current, dark current, band gap, and the fill factor are reported.
- Pharmaceuticals Market, Consumption Trends and Disease Incidence Are Not Driving the Pharmaceutical Research on Water and Wastewater(MDPI, 2021-03-04) Gonzalez Peña, Omar Israel; López Zavala, Miguel Ángel; Cabral Ruelas, Héctor; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyPharmaceuticals enhance our quality of life; consequently, their consumption is growing as a result of the need to treat ageing-related and chronic diseases and changes in the clinical practice. The market revenues also show an historic growth worldwide motivated by the increase on the drug demand. However, this positivism on the market is fogged because the discharge of pharmaceuticals and their metabolites into the environment, including water, also increases due to their inappropriate management, treatment and disposal; now, worldwide, this fact is recognized as an environmental concern and human health risk. Intriguingly, researchers have studied the most effective methods for pharmaceutical removal in wastewater; however, the types of pharmaceuticals investigated in most of these studies do not reflect the most produced and consumed pharmaceuticals on the market. Hence, an attempt was done to analyze the pharmaceutical market, drugs consumption trends and the pharmaceutical research interests worldwide. Notwithstanding, the intensive research work done in different pharmaceutical research fronts such as disposal and fate, environmental impacts and concerns, human health risks, removal, degradation and development of treatment technologies, found that such research is not totally aligned with the market trends and consumption patterns. There are other drivers and interests that promote the pharmaceutical research. Thus, this review is an important contribution to those that are interested not only on the pharmaceutical market and drugs consumption, but also on the links, the drivers and interests that motivate and determine the research work on certain groups of pharmaceuticals on water and wastewater.
- Effects of a Thermal Inversion Experiment on STEM Students Learning and Application of Damped Harmonic Motion(MDPI, 2021-01-18) Gonzalez Peña, Omar Israel; Morán Soto, Gustavo; Rodríguez Masegosa, Rodolfo; Rodríguez Lara, Blas Manuel; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyThere are diverse teaching methodologies to promote both collaborative and individual work in undergraduate physics courses. However, few educational studies seek to understand how students learn and apply new knowledge through open-ended activities that require mathematical modeling and experimentation focused on environmental problems. Here, we propose a novel home experiment to simulate the dynamics of a flue gas under temperature inversion and model it as damped harmonic motion. After designing and conducting the experiment, twenty six first year students enrolled in STEM majors answered six qualitative questions to inform us about their epistemological beliefs regarding their learning process. Their answers imply that this type of open-ended experiments may facilitate students’ understanding of physical phenomena and point to the significance of physics instructors as promoters of epistemological development. In general, students described this activity as a positive experience that helped them connect an environmental phenomenon with a fundamental physics concept.
- Is It a Good Idea for Chemistry and Sustainability Classes to Include Industry Visits as Learning Outside the Classroom? An Initial Perspective(MDPI, 2021-01-14) Gonzalez Peña, Omar Israel; Peña Ortiz, María Olivia; Morán Soto, Gustavo; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyLearning outside the classroom (LOtC) activities are part of pedagogical methodologies that are currently applied in the development of student skills. The objective of this study is to determine the perceptions of faculty and undergraduate students concerning industrial visits and define the advantages and disadvantages of these activities. A survey was designed with 17 questions, from a sample of 296 students and 32 professors from various chemistry and sustainability courses. The statistical samples correspond to a population of 2275 students and 246 professors. Descriptive statistics were used to analyze and compare participant perceptions on industrial visits, as LOtC activities. Results indicated a positive perception for making industrial visits, generating more interest in the class material and helping students acquire knowledge. Despite this positive perception, it was found that professors are unlikely to organize industrial visits frequently due to the work required to plan, perform, and evaluate these activities. This issue suggests that approximately 40% of the students may lose the advantages that LOtC activities could offer. Professors must be motivated and supported by administrators to include industrial visits in their courses as a teaching strategy to provide a beneficial experience to the majority of students enrolled in chemistry and sustainability undergraduate programs.
- Use of Cyclic Voltammetry to Describe the Electrochemical Behavior of a Dual-Chamber Microbial Fuel Cell(MDPI, 2019-09-14) López Zavala, Miguel Ángel; Cabral Ruelas, Héctor; Delgado Mena, Cristina; Guizani, Mokhtar; Gonzalez Peña, Omar Israel; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyCyclic voltammetry (CV) was used in this work to describe the electrochemical behavior of a dual-chamber microbial fuel cell (MFC). The system performance was evaluated under vacuum and non-pressurized conditions, different reaction times, two sweep potentials, 25 and 50 mVs−1 and under different analyte solutions, such as distilled water and domestic wastewater. CV experiments were conducted by using a potentiostat with three different configurations to collect the measurements. A dual-chamber MFC system was equipped with a DupontTM Nafion® 117 proton exchange membrane (PEM), graphite electrodes (8.0 cm × 2.5 cm × 0.2 cm) and an external electric circuit with a 100-Ω resistor. An electrolyte (0.1 M HCl, pH ≈ 1.8) was used in the cathode chamber. It was found that the proton exchange membrane plays a major role on the electrochemical behavior of the MFC when CV measurements allow observing the conductivity performance in the MFC in the absence of a reference electrode; under this potentiostat setting, less current density values are obtained on the scanned window potentials. Therefore, potentiostat setting is essential to obtain information in complex electrochemical processes present in biological systems, such as it is the case in the MFCs. Results of the study showed that wastewater constituents and the biomass suspended or attached (biofilm) over the electrode limited the electron charge transfer through the interface electrode-biofilm-liquor. This limitation can be overcome by: (i) Enhancing the conductivity of the liquor, which is a reduction of the ohmic drop, (ii) reducing the activation losses by a better catalysis, and (iii) by limiting the diffusional gradients in the bulk liquor, for instance, by forced convection. The use of the electrolyte (0.1 M HCl, pH ≈ 1.8) and its diffusion from the cathode to the anode chamber reduces the resistance to the flow of ions through the PEM and the flow of electrons through the anodic and cathodic electrolytes. Also reduces the activation losses during the electron transfer from the substrate to the electrode surface due to the electrode catalysis improvement. On the other hand, vacuum also demonstrated that it enhances the electrochemical performance of the dual-chamber MFC due to the fact that higher current densities in the system are favored.
- Electrochemical Instrumentation of an Embedded Potentiostat System (EPS) for a Programmable-System-On-a-Chip(MDPI, 2018-12-18) Gonzalez Peña, Omar Israel; Muñoz Martínez, Adrián Iván; Colomer Farrarons, Jordi; Rodríguez Delgado, José Manuel; Ávila Ortega, Alfonso; Dieck Assad, Graciano; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyUnder the main features required on portable devices in electrochemical instrumentation is to have a small size, low power consumption, economically affordable and precision in the measurements. This paper describes the development of a programmable Embedded Potentiostat System (EPS) capable of performing electrochemical sensing over system-on-a-chip platforms. Furthermore, the study explains a circuit design and develops some validation of the entire system. The hardware validation is performed by electrochemical experiments such as Double Step Chronoamperometry (DSC), Linear Sweep Voltammetry (LSV) and Cyclic Voltammetry (CV); moreover, a comparison of the experimental signals between a commercial potentiostat and the EPS was done by analysis of errors on the response signal. Results illustrate that the EPS is capable of handling currents in the range of absolute values of 86.44 to 3000 nA and having control voltages in the range of ±2 V. The device can support from 50 to 2000 samples per second. The EPS capabilities were compared with other compact potentiostats. The programmable EPS is an original approach which hugely reduces the hardware complexity and leads the way to create new applications for Point-of-Care or industrial developments with a reusable full electronics module.
- Improvement of Wastewater Treatment Performance and Power Generation in Microbial Fuel Cells by Enhancing Hydrolysis and Acidogenesis, and by Reducing Internal Losses(MDPI, 2018-09-02) López Zavala, Miguel Ángel; Torres Delenne, Pamela Renée; Gonzalez Peña, Omar Israel; GONZALEZ PENA, OMAR ISRAEL; 162547; Instituto Tecnológico y de Estudios Superiores de MonterreyIn this study, biodegradation performance and power generation in MFCs were improved. Domestic wastewater was biodegraded in a dual-chamber MFC system equipped with a DupontTM Nafion® 117 proton exchange membrane, graphite electrodes (8.0 cm × 2.5 cm × 0.2 cm) in both chambers and an external electric circuit with a 100 Ω resistor. Experiments were conducted using an anaerobic inoculum that was prepared onsite by acclimating mixed liquor from municipal wastewater. Aqueous hydrochloric acid (0.1 M HCl, pH 1.82) was used as the electrolyte in the cathode chamber. Free-oxygen conditions were promoted in both chambers by means of a vacuum (77.3 kPa). Low pH (< 5) and mixing conditions were maintained in the anode chamber and all the tests were carried out at 25 ± 1 °C. These conditions enhanced the hydrolysis and acidogenesis, inhibited the methanogenesis and reduced the internal losses. All of them together contributed to improve the treatment performance and power generation of the MFCs. Results of batch tests show COD reductions of up to 95%, voltages peaks of 0.954 V, maximum power densities on the order of 2.1 W·m−2 and 36.9 W·m−3, and energy generation peaks of 99.4 J·mg−1 COD removed. These values are greater than those reported in the MFCs’ literature for municipal wastewater (26 mW·m−2–146 mW·m−2), industrial wastewater (419 mW·m−2) and culture medium solutions (1.17 W·m−2), and similar to those of glucose (3.6 W·m−2). Thus, these results can contribute to further enhancing the energy generated in MFCs and moving forward to make the MFCs more ready for practical applications of bioenergy production.