23 research outputs found
Hacia la unificación de las herramientas de simulación de aplicaciones solares para procesos industriales
CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia SolarRESUMEN: La disponibilidad de herramientas que permitan realizar estudios de viabilidad en proyectos de energía solar térmica para procesos industriales (SHIP), de manera rápida, precisa y con bajo coste, es crítica para la aceptación de esta tecnología por el sector industrial. Las herramientas surgidas en respuesta a esta demanda son muy heterogéneas, lo que dificulta la comparación de proyectos. Esta disparidad limita el desarrollo comercial de la tecnología al generar incertidumbre en empresas promotoras y entidades financieras. En este artículo se presenta una metodología para unificar los esfuerzos que se están llevando a cabo para el desarrollo de estas herramientas de simulación. La metodología propuesta combina la utilización de código abierto y privado. De esta forma se garantiza un desarrollo conjunto y continuado por universidades y centros público/privados, además de permitir a empresas privadas su utilización, manteniendo privada cualquier información sensible.ABSTRACT: The availability of tools capable of performing pre-feasibility studies of Solar Heat for Industrial Processes (SHIP) projects in a fast, precise, and low cost way has become necessary for the acceptance of this technology by the industrial sector. The tools that have emerged so far are very heterogeneous, making it difficult to benchmark projects. The significant disparity in the toold limits the commercial development of the technology by generating uncertainty in project promoters and financial entities. This work presents a methodology to unify the efforts that are being carried out for the development of these simulation tools. The proposed methodology combines the use of open and proprietary source. In this way, open source development is maintained by universities and public / private centers, while private companies still keep any sensitive information private.info:eu-repo/semantics/publishedVersio
DSL logística Arribazón 2019
Se ha procurado generar un vínculo con la comunidad nahua de la playa Ixtapilla, Michoacán, en el campamento tortuguero desde hace aproximadamente 4 años. Con el objetivo de superar la edición del año pasado, se planificó el festival arribazón del año en curso, con la finalidad de generar una mayor derrama económica en comparación con la del año pasado para poder cumplir los objetivos planteados en el campamento tortuguero punta Ixtal. En este semestre se replicaron todos los objetivos, los cuales resultaron exitosos y se replantearon nuevas estrategias para resolver aquello detalles que fallaron en la primera edición.ITESO, A.C
Diseño de una práctica de química como proyecto de ciencias, procesos de extracción de proteínas
El desarrollo del Aprendizaje de ciencia, en los estudiantes de la Licenciatura de Educación Secundaria con la especialidad en Química, se lleva a cabo empleando como una buena técnica la de aprendizaje basado en proyectos, el proyecto presentado como una propuesta es la extracción de compuestos orgánicos, para esto se diseñó una práctica de extracción de proteínas por dos métodos, uno convencional que es la precipitación isoeléctrica y otro casi desconocido como método de extracción de proteínas, que es el de miscelización. La experimentación práctica que se diseñó para tratar de establecer como obligada para el final de curso de ciencias de educación secundaria, ya que integra varios componentes que permiten aprender tanto química como procesos fisicoquímicos de extracción, además de que la medición de pH hace que se comprenda mejor al hacer curvas base de los procesos de extracción, esto es debido a que se emplean dos métodos que permiten establecer diferencias de extracción de proteína de fuentes como las leguminosas y de pastas residuales de oleaginosas. Se encontró relevante que ambos procesos de extracción son factibles para obtener proteína en alta concentración, y con ambos procesos parece ser factible obtener no solo concentrados, sino aislados proteicos.The development of learning science, students of the Bachelor of Secondary Education with a specialization in Chemistry, is performed using a good technique of project-based learning, the project presented as a proposal is the removal of organic compounds to practice this protein extraction by two methods was designed, which is a conventional isoelectric precipitation and other almost unknown as protein extraction method, which is to miscelización. Practical experimentation which was designed to try to establish as a must for the end of year high school science education, because it integrates several components that allow you to learn both chemical and physicochemical extraction processes, in addition to the measurement of pH makes you understand better to make curves based extraction processes, this is due to two methods for extraction differentiate sources of protein such as legumes and oil waste pastes are used. It was found that both processes relevant extraction are feasible for protein in high concentration, and both processes appear to be feasible to obtain not only concentrated, but protein isolates
Clavigero. Comunidad de saberes, núm 17: Cotidianidad algorítmica
La finalidad de este número de Clavigero es ofrecer un conjunto de ideas que ayuden a la comprensión y al diálogo crítico acerca de estos temas, mediante el abordaje de conceptos, experiencias, espacios de organización y marcos de comprensión que eleven el nivel de la discusión relativa a la digitalización y aceleración de la realidad contemporánea
Parametric Methodology to Optimize the Sizing of Solar Collector Fields in Series-Parallel Arrays
The analysis of solar thermal systems through numerical simulation is of great importance, since it allows predicting the performance of many configurations in any location and under different climatic conditions. Most of the simulation tools are commercial and require different degrees of training; therefore, it is important to develop simple and reliable methodologies to obtain similar results. This study presents a parametric methodology to size stationary solar collector fields, with operating temperatures up to 150 °C. The costs of the collector loop piping and the pumping power of different series−parallel arrays is considered. The proposed tool was validated with experimental data and through simulations using commercial software. The tool allows establishing series−parallel arrays and calculates the volume of the storage tank according to the thermal load. The calculation is based on the system energy balance, where the mass flow and the heat losses in the interconnections of the collectors are taken into account. The number of collectors and the optimal series−parallel array were determined. The results show deviations lower than 7% in the relative error of the temperature profiles and in the solar fraction, with respect to the results obtained by dynamic simulations
Pre-Feasibility Assessment Tool for Solar Industrial Process Heating
The industrial sector demands 25% of global energy as heat, where one-third is used at temperatures below 150 °C. Nevertheless, the installed solar heating capacity in the industry is only 0.02%, even though the integration of solar heating systems into production processes could significantly reduce fossil fuel consumption at a competitive cost. Among other reasons, this low penetration is due to the final users’ lack of knowledge of solar heating technologies. As a result, a free pre-feasibility assessment tool was developed for non-specialised users to evaluate the possibility of integrating solar heat into their processes using basic information. This tool uses transient simulation to estimate a feasible solar heating system through the parametric optimisation of the solar collection area, thermal storage volume, heat exchange capacity, and solar integration schemes at the supply level and costs. A commercial facility in Mexico was analysed using the developed tool as a case study. However, even when this is not a design tool, the calculated solar collector area, storage tank volume, and investment were only 2.1%, 9.0%, and 2.3% higher than reported by the solar designer. Pre-feasibility assessment tools are essential to overcome the certainty gap between end users and solar designers, thus enhancing the possibility of implementing solar heating systems in various commercial and industrial processes
Efecto del ejercicio máximo y submáximo sobre excreción de albúmina en adultos mayores
Introduction: Microalbuminuria could be induced by strenuous exercise in young and adults. The effects of maximum and submaximal
exercise on microalbuminuria in elderly (e»65 years) are not well known. Purpose: To evaluate the effect of different intensities of acute exercise on
microalbuminuria. Methods: 20 healthy subjects, 13 men and 7 women (69 ± 4 years). They performed 3 exercise tests a week apart: MAXCAP-B,
SUBMAX-B 80% and 60%. Urine samples were collected before, immediately after, one hour and 24 hours after exercise to determine microalbuminuria
(20-200 mg/l). Results: microalbuminuria was observed immediately after in MAXCAP-B-B (19,0 mg/l, ± 10,7) and 1 hour post-exercise (18,6 ± 9,4
mg/l) (p 0.05). Conclusion: The High intensity of exercise favor the
appearance of microalbuminuria in apparently healthy older adults, this response is moderate and transient. There was no persistent microalbuminuria
at 24 hours following the practice of maximum and submaximal exercise. The maximum and submaximal exercise in apparently healthy older adults.
This study supports that in performing submaximal exercise maximum (80% and 60%) on renal function in healthy elderly has no adverse impact.
Studies should be conducted to measure renal responses to acute exercise in patients with chronic degenerative diseases.Introducción: En jóvenes y adultos la microalbuminuria podría ser inducida por ejercicio físico extenuante. Los efectos del ejercicio máximo
y submáximo sobre microalbuminuria en adultos mayores (e»65 años) no son bien conocidos. Objetivo: Evaluar el efecto de diferentes intensidades de
ejercicio agudo sobre la microalbuminuria. Métodos: 20 sujetos sanos, 13 hombres y 7 mujeres (69 ± 4 años). Realizaron 3 pruebas de ejercicio físico con
una semana de diferencia: MAXCAP-B, SUBMAX-B 80% y SUBMAX-B 60%. Se recolectaron muestras de orina antes, inmediatamente después, una
hora y 24 horas después del ejercicio para determinar la microalbuminuria (20 - 200 mg/l). Resultados: Solo se observó una microalbuminuria
significativamente más elevada inmediatamente después en MAXCAP-B (19,0 mg/l, ± 10,7) y 1 hora postejercicio (18,6 ± 9,4 mg/l) (p <0,05). A las
24 horas después de las pruebas de ejercicio físico no existió microalbuminuria (p > 0,05). Conclusión La intensidad elevada del ejercicio favorece la
aparición de microalbuminuria en los adultos mayores aparentemente sanos, esta respuesta es moderada y transitoria, y debe considerarse en los
programas de ejercicio. No existió microalbuminuria persistente a las 24 horas posterior a la práctica de ejercicio físico máximo y submáximo, lo cual
indica que en adultos mayores aparentemente sanos el efecto solo es agudo y transitorio. Este estudio soporta que el ejercicio submáximo y máximo
(80% y 60%) no tiene impacto desfavorable sobre la función renal en adultos mayores aparentemente sanos. Se deben realizar estudios para medir las
respuestas renales al ejercicio agudo en pacientes con enfermedades crónicas degenerativas
Activity patterns in a feline assemblage in south-west Mexico, and their relationship with prey species
t-BHQ Protects Against Oxidative Damage and Maintains the Antioxidant Response in Malnourished Rats
Objective: Tert-butylhydroquinone (t-BHQ) protective effect against oxidative damage in thymus from malnourished pops-rats was evaluated. Methods: Malnutrition in pops-rats was induced during the lactation period and first-, second-, and third-degree malnourished rats were studied (MN1, MN2, and MN3). To determine t-BHQ protective effect, lipid peroxidation (LPx) was assessed, as well as the carbonyl content. The reduced glutathione and glutathione disulfide content were determined and antioxidant enzyme activities were measured. Results: Oxidative protein damage, LPx, and Nuclear Factor-κB (NF-κB) content, increased in the MN2 and MN3 compared to well-nourished rats, associated with lower protein content and antioxidant activity of superoxide dismutase (SOD), glutathione peroxidase (GPx), and catalase. Tert-butylhydroquinone treatment induced a protective effect against lipids and proteins oxidative damage, as well as decrease in NF-κB in MN rats and restored the antioxidant mechanisms, mostly GPx and SOD. No differences were found between male and female animals. Conclusions: Results show that higher body weight deficit leads to increased oxidative damage and probably inflammation, attributable to alterations in antioxidant mechanisms. These effects were reversed by the t-BHQ-treatment, which restores the antioxidant response. Our findings suggest that t-BHQ could be an interesting pharmacological intervention, but it needs to be studied further