Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00-77
Yazmin Lisbeth Mack Vergara, V. John
Concrete production is the highest among building materials and will increase since we need it for housing and infrastructure. This material demands significant volumes of water for activities in its life cycle other than for concrete mixing. On the other hand, water resources are scarce; the annual local availability is limited, and the demand is growing. A case study is presented where water figures for concrete production activities from literature, were used to calculate the concrete water footprint from cradle to gate by applying a simplified life cycle approach. Then, using the results from the case study, a global concrete water footprint is estimated using annual concrete production figures. The global concrete water footprint was estimated in ~18 billion m3 (6.32-30.43 billion m3). Consequently, study of concrete water footprint is fundamental to establish actions to improve water efficiency.
{"title":"Global Concrete Water Footprint","authors":"Yazmin Lisbeth Mack Vergara, V. John","doi":"10.1109/IESTEC46403.2019.00-77","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00-77","url":null,"abstract":"Concrete production is the highest among building materials and will increase since we need it for housing and infrastructure. This material demands significant volumes of water for activities in its life cycle other than for concrete mixing. On the other hand, water resources are scarce; the annual local availability is limited, and the demand is growing. A case study is presented where water figures for concrete production activities from literature, were used to calculate the concrete water footprint from cradle to gate by applying a simplified life cycle approach. Then, using the results from the case study, a global concrete water footprint is estimated using annual concrete production figures. The global concrete water footprint was estimated in ~18 billion m3 (6.32-30.43 billion m3). Consequently, study of concrete water footprint is fundamental to establish actions to improve water efficiency.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132589334","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00078
Favela Herrera Marie Karen Issamar, R. Roberto
The objective of this article is to identify trends in publications about new and emerging labor risks (NER) in the context of the evolution of the industry to analyze what is known so far of the subject, what has been investigated and which aspects remain unknown. Thematically is analyzed existing information on the evolution of occupational risks depending on the advancement of technology in manufacturing, considering keywords and the combination thereof, in Spanish and English during the period 2000-2019 in different sources of consultation such as magazines, articles, degree papers and conference proceedings. With this review it has been possible to identify a relationship between technological progress and a tendency to develop new and emerging labor risks in the industrial field; as a result, researchers from countries such as Spain, Germany, England, Canada and India have collaborated in their identification and have proposed different methods of measurement, which contribute to be frames of reference for future research. The effects that digitalization is having in the industry, are manifested through the so-called Industry 4.0, with technologies such as the Internet of Things, information in the cloud, Big Data, simulation, etc., and are revolutionizing the functioning of the industry, which in turn and given the organizational nature tends to change workplaces as well as the processes and practices of conventional work, creating traditional occupational hazards and other designated by the Occupational Safety and Health Administration (for its acronym in English OHSA) as new and emerging labor risks (NER).
{"title":"New and Emerging Occupational Risks (NER) in Industry 4.0: Literature Review","authors":"Favela Herrera Marie Karen Issamar, R. Roberto","doi":"10.1109/IESTEC46403.2019.00078","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00078","url":null,"abstract":"The objective of this article is to identify trends in publications about new and emerging labor risks (NER) in the context of the evolution of the industry to analyze what is known so far of the subject, what has been investigated and which aspects remain unknown. Thematically is analyzed existing information on the evolution of occupational risks depending on the advancement of technology in manufacturing, considering keywords and the combination thereof, in Spanish and English during the period 2000-2019 in different sources of consultation such as magazines, articles, degree papers and conference proceedings. With this review it has been possible to identify a relationship between technological progress and a tendency to develop new and emerging labor risks in the industrial field; as a result, researchers from countries such as Spain, Germany, England, Canada and India have collaborated in their identification and have proposed different methods of measurement, which contribute to be frames of reference for future research. The effects that digitalization is having in the industry, are manifested through the so-called Industry 4.0, with technologies such as the Internet of Things, information in the cloud, Big Data, simulation, etc., and are revolutionizing the functioning of the industry, which in turn and given the organizational nature tends to change workplaces as well as the processes and practices of conventional work, creating traditional occupational hazards and other designated by the Occupational Safety and Health Administration (for its acronym in English OHSA) as new and emerging labor risks (NER).","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131756113","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00014
L. Latorre-Vásquez, D. Mejía-España, Diana Melisa Chaves-Morillo, Leydy Viviana Córdoba-Solarte, D. Trejo-Escobar, Luis Valencia-Flórez
The potato as a basic food of the population, has a great diversity of varieties and genotypes, that in their great majority are little cultivated, as is the case of native potatoes. To potentiate the crop and contribute to the conservation of biodiversity, the morphological and nutritional characterization of tubers of 24 genotypes of potato was carried out. The Gower similarity coefficient was used for the analysis of mixed data (qualitative and quantitative variables). The hierarchical classification analysis made it possible to group the genotypes into four groups with similar characteristics. Group 1 was characterized by short dormancy times and percentages of dry matter less than 20 g/100g, rare forms of tubers, deep eyes and magnesium contents distinguished group 2, group 3 evidenced presence of secondary colorations in tuber flesh and calcium and zinc contents; finally, group 4 identified two genotypes with opposite characteristics. The knowledge of the morphology of the tuber and its nutritional properties contribute to promote the crop, its use and preservation.
{"title":"Morphological and Nutritional Characterization of Tubers of 24 Genotypes of Native Potato","authors":"L. Latorre-Vásquez, D. Mejía-España, Diana Melisa Chaves-Morillo, Leydy Viviana Córdoba-Solarte, D. Trejo-Escobar, Luis Valencia-Flórez","doi":"10.1109/IESTEC46403.2019.00014","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00014","url":null,"abstract":"The potato as a basic food of the population, has a great diversity of varieties and genotypes, that in their great majority are little cultivated, as is the case of native potatoes. To potentiate the crop and contribute to the conservation of biodiversity, the morphological and nutritional characterization of tubers of 24 genotypes of potato was carried out. The Gower similarity coefficient was used for the analysis of mixed data (qualitative and quantitative variables). The hierarchical classification analysis made it possible to group the genotypes into four groups with similar characteristics. Group 1 was characterized by short dormancy times and percentages of dry matter less than 20 g/100g, rare forms of tubers, deep eyes and magnesium contents distinguished group 2, group 3 evidenced presence of secondary colorations in tuber flesh and calcium and zinc contents; finally, group 4 identified two genotypes with opposite characteristics. The knowledge of the morphology of the tuber and its nutritional properties contribute to promote the crop, its use and preservation.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132331623","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00127
Danny Murillo, M. Fernández
In this work, we present the results related to the analysis of 99 academic journals in Panama. The analysis is focused mainly of 37 scientific journals that are in digital format and online platforms. This analysis is quantitative and descriptive, which is of different bibliometric indicators that use extracted data from Googles Scholar such as, citations, number of publications and index in order to create a comparative table of local journals. The work also presents some information about the integration in databases of the magazines, basic elements such as ISSN, use of online platforms identifying the limited scope and visibility of the Panamanian magazines. A comparative analysis of local journals is made with university of Costa Rican magazines, showing how distant our university is in productivity and impact of the publications in constrat our Costa Rican colleague. The results are intended to be a diagnosis of the journals of our universities, as well as to identify the failures to work on improving the visibility, quality, scope, and impact of our journals at national and international level.
{"title":"Analysis of Bibliometric Indicators of Panama Magazines to Know Their Scope and Projection of Citations and Impact in the National Context","authors":"Danny Murillo, M. Fernández","doi":"10.1109/IESTEC46403.2019.00127","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00127","url":null,"abstract":"In this work, we present the results related to the analysis of 99 academic journals in Panama. The analysis is focused mainly of 37 scientific journals that are in digital format and online platforms. This analysis is quantitative and descriptive, which is of different bibliometric indicators that use extracted data from Googles Scholar such as, citations, number of publications and index in order to create a comparative table of local journals. The work also presents some information about the integration in databases of the magazines, basic elements such as ISSN, use of online platforms identifying the limited scope and visibility of the Panamanian magazines. A comparative analysis of local journals is made with university of Costa Rican magazines, showing how distant our university is in productivity and impact of the publications in constrat our Costa Rican colleague. The results are intended to be a diagnosis of the journals of our universities, as well as to identify the failures to work on improving the visibility, quality, scope, and impact of our journals at national and international level.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133016992","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00-80
Itamar Harris, M. D. L. Á. O. D. Rosario, A. James, D. Bruneau
Phase change materials (PCM) are materials with the ability to store a large amount of energy (latent heat) during their change from solid to a liquid phase. This takes place at a certain melting temperature. Amid the global energy crisis, multiple applications of these materials have been studied at the theoretical, numerical and experimental approach, obtaining promising results in terms of an increase in the efficiency of these systems. However, the application of these materials is being studied since there are no rules or predictions of the feasibility of its application in diverse weather conditions. The tropical climate condition is one of the least studied in this context. In this work, a review of the main findings of recent studies conducted in tropical climate conditions is presented. Additionally, an analysis of the main challenges and opportunities of the application of PCM in the climate of Panama is performed. It was concluded that some applications in passive cooling and solar water heating systems might have the potential for their implementation. However, further studies are required to take into account other applications.
{"title":"Introduction to the Application of Phase Change Materials under Tropical Climate of Panama","authors":"Itamar Harris, M. D. L. Á. O. D. Rosario, A. James, D. Bruneau","doi":"10.1109/IESTEC46403.2019.00-80","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00-80","url":null,"abstract":"Phase change materials (PCM) are materials with the ability to store a large amount of energy (latent heat) during their change from solid to a liquid phase. This takes place at a certain melting temperature. Amid the global energy crisis, multiple applications of these materials have been studied at the theoretical, numerical and experimental approach, obtaining promising results in terms of an increase in the efficiency of these systems. However, the application of these materials is being studied since there are no rules or predictions of the feasibility of its application in diverse weather conditions. The tropical climate condition is one of the least studied in this context. In this work, a review of the main findings of recent studies conducted in tropical climate conditions is presented. Additionally, an analysis of the main challenges and opportunities of the application of PCM in the climate of Panama is performed. It was concluded that some applications in passive cooling and solar water heating systems might have the potential for their implementation. However, further studies are required to take into account other applications.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132032571","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00019
R. Vergara, I. Arrocha, R. Herrera
The gram-negative bacteriumBurkholderia Glumaeis the causal agent of the disease called bacterial panicle blight,which causes grain rot, in our case rotting of rice, which is themain crop in Panama. It was first reported in our country in2005 causing losses greater than 40 %. This study focuses onthe comparison of various nonlinear mathematical models oftenused to describe the growth dynamics of these kinds of bacteriaand seeks to determine the best fit. The state parameters ofthese models will be optimized via the metaheuristic ParticleSwarm algorithm, which is an iterative method that seeks tooptimize a function, in order to select the mathematical modelthat allows modeling the growth of the bacteria and analysis ofits characteristics, such as replication patterns, among others.
{"title":"Selection of a Primary Model to Describe the Growth Curve of Burkholderia glumae","authors":"R. Vergara, I. Arrocha, R. Herrera","doi":"10.1109/IESTEC46403.2019.00019","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00019","url":null,"abstract":"The gram-negative bacteriumBurkholderia Glumaeis the causal agent of the disease called bacterial panicle blight,which causes grain rot, in our case rotting of rice, which is themain crop in Panama. It was first reported in our country in2005 causing losses greater than 40 %. This study focuses onthe comparison of various nonlinear mathematical models oftenused to describe the growth dynamics of these kinds of bacteriaand seeks to determine the best fit. The state parameters ofthese models will be optimized via the metaheuristic ParticleSwarm algorithm, which is an iterative method that seeks tooptimize a function, in order to select the mathematical modelthat allows modeling the growth of the bacteria and analysis ofits characteristics, such as replication patterns, among others.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134283186","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00107
José Rolando Serracín P., Héctor Montes Franceschi, Iveth Moreno, R. Caballero
This article presents the processes performed to obtain a medical image in three dimensions (3D), reconstructed from a stack of 2D medical images, acquired through a computerized axial tomography (CAT). Additionally, it is described the integration of a haptic tool within the developed system for the interaction and manipulation of the 3D virtual solid, generated in the application developed in this work, by a user who operates this tool (Phantom Omni).
{"title":"Computer Application for 3D Reconstruction from Medical Images and Integration of a Haptic Tool","authors":"José Rolando Serracín P., Héctor Montes Franceschi, Iveth Moreno, R. Caballero","doi":"10.1109/IESTEC46403.2019.00107","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00107","url":null,"abstract":"This article presents the processes performed to obtain a medical image in three dimensions (3D), reconstructed from a stack of 2D medical images, acquired through a computerized axial tomography (CAT). Additionally, it is described the integration of a haptic tool within the developed system for the interaction and manipulation of the 3D virtual solid, generated in the application developed in this work, by a user who operates this tool (Phantom Omni).","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123576381","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00-66
Norma L. Miller, J. Sánchez-Galán, B. Fernández
This paper reports the use of an intelligent tutoring system (STI) at the Technological University of Panama by students applying to the university during 2018. All participating students had the opportunity to interact via Internet with a mathematics focused STI, to assess the level of their mathematical knowledge and receive personalized tutoring to improve it. This article describes the usage of the STI by a cohort of aspiring students, as well as the most relevant aspects revealed by their interaction with the learning platform. Results suggest that use of the STI may reduce some of the initial differences found within the cohort, and that this effect is strongly correlated with the time spent in the platform, but not with the level of initial knowledge. The significance of this work is twofold: fist, it introduces the use of an STI as a complementary learning tool for second and third level education in Panama, whilst shedding light on the low math levels of students aspiring to enter the university.
{"title":"Use of an Intelligent Tutoring System for Mathematics by Students Who Aspire to Enter the Technological University of Panama","authors":"Norma L. Miller, J. Sánchez-Galán, B. Fernández","doi":"10.1109/IESTEC46403.2019.00-66","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00-66","url":null,"abstract":"This paper reports the use of an intelligent tutoring system (STI) at the Technological University of Panama by students applying to the university during 2018. All participating students had the opportunity to interact via Internet with a mathematics focused STI, to assess the level of their mathematical knowledge and receive personalized tutoring to improve it. This article describes the usage of the STI by a cohort of aspiring students, as well as the most relevant aspects revealed by their interaction with the learning platform. Results suggest that use of the STI may reduce some of the initial differences found within the cohort, and that this effect is strongly correlated with the time spent in the platform, but not with the level of initial knowledge. The significance of this work is twofold: fist, it introduces the use of an STI as a complementary learning tool for second and third level education in Panama, whilst shedding light on the low math levels of students aspiring to enter the university.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122072176","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00017
R. Caballero, Braian Rivera
Currently, the large volume of imports, the lack of interest of young people to work in the agroindustry, the lack of implementation of new technologies and the excessive participation of intermediaries in the supply chain are some of the main challenges the producers of the agricultural sector in Panama face. All this has repercussions on the absence of a traceability system that guarantees and certifies the origin of the products originating in this sector. This paper presents a design model that adapts new technologies such as blockchain in the agribusinesses in order to optimize the processes in the supply chain, and specifically improve the traceability of the product. First, the current state of the agricultural supply chain in Panama and the state of the art of blockchain technology are analyzed. Consecutively, the variables that influence the competitiveness of the agricultural sector as well as the basic principles of the blockchain technology are defined and an evaluation about which principles could optimize the competitiveness variables of the agricultural supply chain is made. Finally, a conceptual design model is presented that shows how the blockchain technology could improve processes in the Panamanian agricultural supply chain.
{"title":"Blockchain: An Alternative to Enable Traceability in the Agricultural Supply Chain in Panama","authors":"R. Caballero, Braian Rivera","doi":"10.1109/IESTEC46403.2019.00017","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00017","url":null,"abstract":"Currently, the large volume of imports, the lack of interest of young people to work in the agroindustry, the lack of implementation of new technologies and the excessive participation of intermediaries in the supply chain are some of the main challenges the producers of the agricultural sector in Panama face. All this has repercussions on the absence of a traceability system that guarantees and certifies the origin of the products originating in this sector. This paper presents a design model that adapts new technologies such as blockchain in the agribusinesses in order to optimize the processes in the supply chain, and specifically improve the traceability of the product. First, the current state of the agricultural supply chain in Panama and the state of the art of blockchain technology are analyzed. Consecutively, the variables that influence the competitiveness of the agricultural sector as well as the basic principles of the blockchain technology are defined and an evaluation about which principles could optimize the competitiveness variables of the agricultural supply chain is made. Finally, a conceptual design model is presented that shows how the blockchain technology could improve processes in the Panamanian agricultural supply chain.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127226165","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}
Pub Date : 2019-10-01DOI: 10.1109/IESTEC46403.2019.00022
C. González-Rivera, A. Amaro-Villeda, M. Ramírez-Argáez
En este trabajo se aplica el método de análisis de curvas de enfriamiento asistido por computadora llamado Balance de Energía Metal/Molde (MEB) a una aleación hipoeutéctica de Al-7.5% Si para determinar el calor latente de fusión y la ruta de solidificación de esta aleación y comparar sus predicciones con respecto a los valores de calor latente reportados en la literatura. Para tal efecto, se preparó la aleación líquida en un crisol de carburo de silicio dentro de un horno eléctrico, utilizando cargas de aluminio y silicio de pureza comercial. La composición química de la aleación se controló utilizando un espectrómetro de emisión por chispa. Se utilizaron moldes cilíndricos de acero inoxidable para contener a las muestras de aleaciones líquidas. Una vez que se preparó la aleación líquida y el molde, la muestra líquida se transfirió al molde y los termopares se insertaron en la muestra y en el molde para obtener sus curvas de enfriamiento durante el enfriamiento y la solidificación de la muestra. Las curvas de enfriamiento fueron procesadas numéricamente por el método MEB, basado en balances de energía aplicados al sistema compuesto muestra de aleación liquida / molde. Las curvas de enfriamiento obtenidas para la muestra de aleación bajo estudio también se procesaron numéricamente utilizando dos de los métodos de análisis de curvas de enfriamiento newtonianos más utilizados, con el propósito de comparar sus rendimientos en la determinación del calor latente de solidificación y en la evolución de la fracción sólida. Los resultados obtenidos en este trabajo sugieren que el método MEB presenta un mejor desempeño en la determinación del calor latente de fusión y predice evoluciones de fracción sólida similares a las predichas por los métodos newtonianos convencionales.
{"title":"Determination of the Latent Heat of Fusion and the Solidification Path of a Hypoeutectic Al Based Alloy Using the Energy Balance Method","authors":"C. González-Rivera, A. Amaro-Villeda, M. Ramírez-Argáez","doi":"10.1109/IESTEC46403.2019.00022","DOIUrl":"https://doi.org/10.1109/IESTEC46403.2019.00022","url":null,"abstract":"En este trabajo se aplica el método de análisis de curvas de enfriamiento asistido por computadora llamado Balance de Energía Metal/Molde (MEB) a una aleación hipoeutéctica de Al-7.5% Si para determinar el calor latente de fusión y la ruta de solidificación de esta aleación y comparar sus predicciones con respecto a los valores de calor latente reportados en la literatura. Para tal efecto, se preparó la aleación líquida en un crisol de carburo de silicio dentro de un horno eléctrico, utilizando cargas de aluminio y silicio de pureza comercial. La composición química de la aleación se controló utilizando un espectrómetro de emisión por chispa. Se utilizaron moldes cilíndricos de acero inoxidable para contener a las muestras de aleaciones líquidas. Una vez que se preparó la aleación líquida y el molde, la muestra líquida se transfirió al molde y los termopares se insertaron en la muestra y en el molde para obtener sus curvas de enfriamiento durante el enfriamiento y la solidificación de la muestra. Las curvas de enfriamiento fueron procesadas numéricamente por el método MEB, basado en balances de energía aplicados al sistema compuesto muestra de aleación liquida / molde. Las curvas de enfriamiento obtenidas para la muestra de aleación bajo estudio también se procesaron numéricamente utilizando dos de los métodos de análisis de curvas de enfriamiento newtonianos más utilizados, con el propósito de comparar sus rendimientos en la determinación del calor latente de solidificación y en la evolución de la fracción sólida. Los resultados obtenidos en este trabajo sugieren que el método MEB presenta un mejor desempeño en la determinación del calor latente de fusión y predice evoluciones de fracción sólida similares a las predichas por los métodos newtonianos convencionales.","PeriodicalId":388062,"journal":{"name":"2019 7th International Engineering, Sciences and Technology Conference (IESTEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127226590","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}
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