Ingenieria y Universidad最新文献

{"title":"Evaluación de una mezcla asfáltica utilizando agregados reciclados de concreto. Caso de estudio. Clima de alta temperatura","authors":"Hermes Ariel Vacca-Gamez, José Elvert Rubio-Tafur, Hernán Camilo Moreno-Chaparro, H. A. Rondón-Quintana","doi":"10.11144/javeriana.iued27.ahau","DOIUrl":"https://doi.org/10.11144/javeriana.iued27.ahau","url":null,"abstract":"En proyectos de infraestructura vial se explotan y utilizan grandes cantidades de agregados de origen natural (NA) para la conformación de capas asfálticas en estructuras de pavimento. Para disminuir el impacto ambiental negativo que genera esta práctica, estos materiales podrían ser sustituidos por agregados de concreto reciclado (RCA). En el presente estudio se midió y evaluó el cambio que experimenta la rigidez bajo carga cíclica (módulo resiliente – RM) y la resistencia a la deformación permanente de una mezcla de concreto asfáltico (HMA) cuando se sustituye la fracción gruesa (gravas y arenas) de un NA por RCA en proporciones de 20%, 40% y 80 % con respecto a la masa. El RM y la deformación permanente fueron medidos debido a que Colombia es un país donde predomina el clima de alta temperatura, en el cual uno de los principales mecanismos de daño de HMAs es el ahuellamiento.  En el presente estudio se reporta un aumento del RM y la resistencia a la deformación permanente de la HMA analizada para cualquier porcentaje de sustitución. Es decir, el uso de RCA como sustituto de NAs podría ser una alternativa sostenible, al mismo tiempo que podría ayudar a incrementar la resistencia al ahuellamiento de HMAs.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139215200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IoT System for Monitoring of Workers at Height","authors":"Damián Camilo Martínez-Martínez, María Catalina Riaño-Jaramillo, Diego Mendez-Chaves, Alejadra González-Correal, Margarita Narducci-Marín","doi":"10.11144/javeriana.iued27.ismw","DOIUrl":"https://doi.org/10.11144/javeriana.iued27.ismw","url":null,"abstract":"Work at height is considered a high-risk task due to the exposure of personnel to non-daily or natural factors for the human being, such as changes in temperature, position and limited displacement, which might affect the person’s metabolism. In Colombia, over the years, this activity has represented a significant number of accidents and deaths. In order to be able to detect a possible eventuality or issue with the worker at height, this project proposed and developed an IoT prototype system to monitor biological variables, such as, heart rate and blood oxygen level, and variables of protection for the worker, such as the securing of the carabiner on the line of life and the height at which the worker is positioned. In the materials and methods section, the system architecture and its connections are explained. To measure heart rate and blood oxygen level, the plethysmography technique is selected, a high-resolution barometer is selected to measure the worker's height, and a pressure sensor is selected to measure carabiner securing. This section also explains the development of electronic instrumentation and the connection of the different modules to guarantee the acquisition of information and its sending to the cloud. The results of the characterization of the prototype indicated errors of 3.56% for the heart rate, 1.1% for the blood oxygen level and 10% for the carabiner securing measurement. As a conclusion the IoT system was designed, implemented and verified for the proposed variables. The system allows real-time measurements and connectivity between physical variables and the cloud.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"42 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139264377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control charts to establish and monitor proficiency in the detection of pulmonary B-lines with Point of Care Ultrasound","authors":"Sandra Patricia Usaquén-Perilla, Deliana Ropero-Rojas, Jaime Mosquera-Restrepo, Jonathan D. Kirsch, Zachary P. Kaltenborn, J. I. García-Melo, Lyda Elena Osorio-Amaya","doi":"10.11144/javeriana.iued27.ccem","DOIUrl":"https://doi.org/10.11144/javeriana.iued27.ccem","url":null,"abstract":"Objective: Point of care ultrasound (POCUS) is a widely used clinical tool. This operator-dependent technique requires methods to establish individual benchmarks and to monitor the learning process. We present the use of the learning curve standard cumulative summation (LC-CUSUM) and CUSUM control charts to establish and monitor, respectively, the proficiency of a physician to detect pulmonary B-lines with POCUS. Materials and Methods: A training course for general practitioners was conducted to detect plasma leakage using POCUS. The trainees and an expert radiologist identified the number of pulmonary B-lines in the POCUS images of 53 hospitalized patients. The interpretation of one trainee was compared to that of the expert radiologist using LC-CUSUM and CUSUM considering image quality and anatomical site. Results and Discussion: We found that image quality was better in the apices than the bases of the lungs. The trainee learning curve differed by anatomical site and the results of LC-CUSUM and CUSUM differed when only high-quality (first scenario) or all images (second scenario) were included in the analysis. Conclusion: The LC-CUSUM and CUSUM control charts were useful to evaluate the learning curve in this case and to identify image quality as an important factor in the evaluation process. They warrant further study as graphical tools for real-time monitoring of POCUS training.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86955522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green Synthesis of Silver-Doped Titanium Dioxide Nanostructures for Acetaminophen Degradation Under Solar Radiation","authors":"María Coronell, Gina Toscano-Lucas, R. Solano, A. Herrera","doi":"10.11144/javeriana.iued26.gsst","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.gsst","url":null,"abstract":"Objective: In this paper, the photocatalytic degradation of acetaminophen was evaluated using silver-doped titanium dioxide nanoparticles in a cylindrical-parabolic composed photoreactor. Materials and methods: Titanium dioxide was synthesized via green synthesis using Cymbopogon citratus leaf extract and doped by silver photodeposition. Results and discussion: Morphological information shows that large agglomerates of approximately 49 nm can be attributed to the strong interaction between nanoparticles and their polycrystalline nature. The photodeposition of metallic silver reduces the surface effects, allowing a decrease in the electrostatic interaction and diameter size of the titanium dioxide, as well as the optical properties due to surface poising during the reduction of silver ions to metallic silver. The photocatalytic activity was performed to degrade acetaminophen as the drug model under visible-light radiation. The results are promising, with superior photodegradation of acetaminophen of approximately 37% and 11% for unmodified titanium dioxide and silver-doped titanium dioxide (0.75 at%) nanostructures compared to the commercial photocatalyst, respectively. Conclusions: Accordingly, the potential photocatalytic application of silver-doped titanium dioxide nanostructures is highlighted and represents a promising alternative for the photodegradation of organic compounds from wastewater eluents.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74552563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Using Software for the Acquisition of Problem-solving Skills in Mechanical Engineering Students","authors":"Nicolás Góngora, D. Malagón, Marco Antonio Velasco","doi":"10.11144/javeriana.iued26.ausa","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.ausa","url":null,"abstract":"Objective: To investigate the effect of using mathematical software as a tool to develop problem-solving competence in mechanical engineering students. Methods: A group of 59 students were evaluated using a test consisting of four technological problems related to Bloom´s taxonomy levels of understanding and application. Interpretation and explanation questions were used for the understanding level, and execution and implementation questions were used for the application level. First, the students tried to solve the problems by manual calculations; then, after brief instruction, they tried to solve them by coding using mathematical software. Results: Successful problem solutions increased from 72 to 93%, 15 to 62% and 13 to 26% of the students’ totals in interpreting, explaining, and implementing situations, respectively, but there was a 55 to 44% regression in regard to execution. Better results in understanding questions with respect to applying questions could be due to the increase in difficulty at the taxonomy level. Conclusion: The current study demonstrates the convenience of using computational tools to facilitate the application of mathematical techniques in problem solving and to improve the learning of engineering students.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79367362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Geographical Method for Assessing Social Distancing as a Preliminary Tool for Implementation Planning. A Case Study: Chapinero, Bogota","authors":"Juan Sebastián Sánchez Gómez, Laura Alejandra Gutiérrez Aguilar","doi":"10.11144/javeriana.iued26.gmas","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.gmas","url":null,"abstract":"Given the pandemic situation generated by Covid-19, it’s necessary to rethink the lifestyle of society and its quality of life around public and urban spaces, researching in 2019 mobility Bogotá survey’s; on average, they record trips is 14,069 of foot trips, between 10 and 20 minutes according to the travel patterns in the distinctive transport analysis areas at the zonal planning unit Chapinero Centro in the city of Bogotá. In spite of having great social and economic dynamics, this UPZ has very small platforms that make it difficult to comply with social distancing, necessary to mitigate the Coronavirus pandemic. For this reason, this article carried out a geographical analysis of this area, using the data provided by the vulnerability map of the Coronavirus website in Colombia of the Departamento Nacional de Planeación, the Instituto de Evaluación Tecnológica en Salud and the Departamento Administrativo Nacional de Estadística. This geographical analysis allowed calculating the variables of the population indicator per block, the maximum population per platform and the criterion of compliance with social distance. These variables allowed designing the vulnerability and social distancing maps. It was evident that 37% of the platforms do not comply the 2-meter distance between people, so it was\u0000Due to the COVID-19 pandemic, rethinking lifestyle and quality of life through the appropriate use of public space is necessary. This study aims to verify the measures of social distancing in Chapinero Centro, which, according to the mobility survey 2019 of Bogota, has an average of 4,633 trips on foot between 10 and 20 minutes according to the travel patterns in the areas of transportation analysis studied. Despite having great social and economic dynamics, this area has small sidewalks that hinder compliance with social distancing, which is necessary to mitigate the coronavirus pandemic. Therefore, geographic analysis of this area was performed using data provided by the vulnerability map of the Coronavirus web in Colombia by the National Planning Department, the Institute for Health Technology Assessment, and the National Administrative Department of Statistics. This geographic analysis made it possible to calculate the variables of population indicator per block, maximum population per sidewalk, and the criterion of compliance with social distancing. When developing the vulnerability and social distancing maps, it became evident that 37% of the sidewalks do not comply with the 2 meters of social distancing between people, so we propose extending them to 3.5 meters and reducing this same value in the vehicular space to design an effective social distancing map. We concluded that the widening of the sidewalks allows flexible use of the streets oriented to a healthy distance, which could be complemented with an accessibility study and a study of vehicular traffic to measure the impact of this intervention.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84280760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"¿Qué pasó con el rendimiento académico en Ingeniería Química?: un estudio en tiempos de COVID-19","authors":"Santiago Monsalve-Silva, S. P. Vera-Monroy","doi":"10.11144/javeriana.iued26.whaa","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.whaa","url":null,"abstract":"El COVID-19 obligó a que las Instituciones de Educación Superior tuvieran que cambiar el ambiente de aprendizaje de presencial a asistido por ordenador, para poder continuar y asegurar la calidad educativa. Objetivo: Este estudio se evaluó el efecto del cambio de ambiente sobre el rendimiento académico de estudiantes de Ingeniería Química. Participaron estudiantes de Química General I e Ingeniería de Fenómenos de Transporte, reconocidos como aprendices y conocedores, respectivamente. Materiales y métodos: Se diseñaron y validaron dos instrumentos tipo likert para evaluar la percepción en términos de variables académicas y sociales, en dos momentos, iniciando el aislamiento y al finalizar el semestre, además se compararon las notas de los estudiantes que participaron en el estudio, llamados aprendices y conocedores, de primero y sexto semestre, respectivamente, con las notas de estudiantes que vieron las asignaturas en otros periodos. Resultados y discusión: Aprendices disminuyeron su rendimiento al experimentar un nuevo contexto de aprendizaje que afectó fuertemente el componente social, mientras que conocedores mejoraron su rendimiento por tener una adaptación escolar, producto de su experiencia y madurez mental. La comunicación y el bienestar formativo fueron reconocidas como las variables que identifican la presencialidad, favoreciendo la apropiación del conocimiento y el desarrollo de competencias. La modalidad remota, condiciona la metodología afectando el aprendizaje, y finalmente, la evaluación no cambia al modificar el entorno, ya que, por ser una declaración institucional, no depende del espacio de aprendizaje. Conclusiones: El ambiente de aprendizaje incide en el rendimiento de los estudiantes, negativamente a los aprendices y positivamente a los conocedores, quienes por tener experiencia universitaria manifiestan capacidad de adaptación. De otro lado, la presencialidad favorece el bienestar mejorando la comunicación asertiva y el desarrollo de competencias transversales.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88862702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Systematic Layout Planning and TOPSIS Application for the Design of a Power Generation Turbine Parts Repair Workshop","authors":"Sebastián Cáceres-Gelvez, M. Arango-Serna, Laura Gutiérrez-Sepúlveda, Natalia Jaramillo-Agudelo, Juliana Mejía-Pérez, Paulina Marín-Quintero","doi":"10.11144/javeriana.iued26.slpt","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.slpt","url":null,"abstract":"Objective: This paper presents a joint application of systematic layout planning (SLP) and TOPSIS methods for the facility layout design of a power generation turbine parts repair workshop. The SLP method is an easy-to-apply tool that can consider both qualitative and quantitative criteria. Materials and Methods: In this case study, the SLP method is adapted for a future plant project that is not currently in place. First, instead of a materials flow analysis, the definition of the process flow, as well as the department requirements, is carried out. Then, the closeness relationships between the process flow activities and the layout alternatives are determined. Finally, the TOPSIS method is applied to evaluate and select the best layout alternative according to the compliance with closeness relationships, the location of dangerous departments, the flow of operations, and the location of departments around a current electrical substation. Results and Discussion: The resulting facility design complies with the defined criteria, and its architectural and layout designs are presented using 3D software. Conclusion: The joint application of SLP and TOPSIS methods allowed us to obtain a proper facility layout design for the case of a power generation turbine parts repair workshop.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79361372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue behavior of ultrahigh-performance fiber-reinforced concrete as an alternative for flexible pavement rehabilitation","authors":"G. Torres, Juan Romano, H. Vacca, Y. Alvarado, F. Reyes","doi":"10.11144/javeriana.iued26.fbuh","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.fbuh","url":null,"abstract":"The fatigue behavior of ultrahigh-performance fiber-reinforced concrete for use as an overlay in the typical rehabilitation of a flexible pavement structure was analyzed in this study. Compression and four-point bending tests were carried out to characterize the concrete mechanical properties. Fatigue tests were performed using the four-point method, and test beams were evaluated without precracking. The specimens were subjected to constant-amplitude sinusoidal loading with a loading frequency of 10 Hz. The magnitude of each stress level was calculated as a percentage of the initial crack stress. The following results were obtained for the concrete: a compressive strength of 127.1 MPa, bending yield strength of 6.23 MPa, maximum bending stress of 9.89 MPa, Young's modulus of 38.1 GPa, and dynamic modulus of 28.6 GPa. The stress and strain at one million cycles were 6.0 MPa and 166 μm/m, respectively. The fatigue test results indicated superior properties of the ultrahigh-performance concrete to those of similar materials.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88060413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preliminary Design of the Landing Gear for a CESTOL Aircraft FAR 23","authors":"Diego Andrés Durán-Giraldo, Carlos Santiago González-Sierra, Fabio Alejandro Merchán-Rincón","doi":"10.11144/javeriana.iued26.pdlg","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.pdlg","url":null,"abstract":"Objective: Design the landing gear for a CESTOL type aircraft according to FAR 23 using: (i) the conceptual designs of the nose and main gear and (ii) evaluate the structural strength of the design by means of finite element analysis at a stage of landing. Materials and methods: The initial requirements for the theoretical development of a preliminary landing gear design are used as a case study. The aircraft’s structure is taken as a base for the different design stages. This analysis is according to a static and level landing condition selected on each gear with a side and supplementary load. Additionally, calculations of geometric parameters and mechanical resistance with preselecting materials for the component analysis to determine and compare theoretical results with finite elements to evaluate the reliability of the design approach. Results and discussion: It is determined to move the main landing gear backward near the cargo area. That allows for better aircraft performance, placing the GC in front of the main gear and avoiding an overturn. However, this load percentage changes in proportion to the longitudinal stability criterion, where it generates an increase in the contribution to the mechanical stress in the structure of the gear. Conclusions: Results obtained about stability, controllability, and structural analysis are acceptable for the regulations of FAA Part 23 with standards associated with airworthiness, being corroborated with theoretical analysis and combined loads.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88718025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}