发布求助
文献互助 智能选刊 最新文献

Dyna-Colombia最新文献

筛选
英文 中文
Occupational hazards and economic indicators in the scheduling of a make-to-order system 按订单生产系统调度中的职业危害与经济指标
Dyna-Colombia Pub Date : 2023-08-11 DOI: 10.15446/dyna.v90n227.107105
Germán Coca-Ortegón
{"title":"Occupational hazards and economic indicators in the scheduling of a make-to-order system","authors":"Germán Coca-Ortegón","doi":"10.15446/dyna.v90n227.107105","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.107105","url":null,"abstract":"Este artículo examina algunos peligros ocupacionales específicos y ciertos indicadores económicos de sostenibilidad en un sistema de manufactura por pedido. Al respecto, se estructuran dos métodos multiobjetivo. El primero es un algoritmo genético rediseñado; el segundo está basado en sumas normalizadas. La comparación establece que el primero supera al segundo en 528%, en lo concerniente al indicador “C-Metric”.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135492023","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}
引用次数: 0
Mercury and human health: probabilistic risk characterization in one of the oldest gold mining areas in Ecuador 汞与人类健康:厄瓜多尔最古老的金矿之一的概率风险特征
Dyna-Colombia Pub Date : 2023-08-11 DOI: 10.15446/dyna.v90n227.107797
Daniela Paz-Barzola, Kenny Escobar-Segovia, Bryan Salgado-Almeida, Cindy Goyburo-Chavez, José Moreno-Chavez
{"title":"Mercury and human health: probabilistic risk characterization in one of the oldest gold mining areas in Ecuador","authors":"Daniela Paz-Barzola, Kenny Escobar-Segovia, Bryan Salgado-Almeida, Cindy Goyburo-Chavez, José Moreno-Chavez","doi":"10.15446/dyna.v90n227.107797","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.107797","url":null,"abstract":"Artisanal and small-scale gold mining is an important contributor to global human emissions of Hg. This study assesses the probabilistic human health risk for two receptors groups (residents and workers) of Portovelo mining area through exposure to Mercury (Hg) in the air at two sites: (a) the central urban area; and (b) El Pache sector. A preliminary risk assessment was performed using Hg concentrations from previous studies. The human health risk in the workplace scenario showed unacceptable levels of non-carcinogenic risk in rainy and dry seasons. Hazard Quotient (HQ) showed that 75% of the workers receptors were exposed to harmful effects on the nervous, digestive, respiratory, and immune systems. Regarding the residential scenario, no human health risk is presented. The study provides information on the levels of risk to the health of the inhabitants living in mining communities to improve public management strategies to minimize risks.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135492024","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}
引用次数: 0
Efficiency analysis of the SVPWM control using the simulink electrical library and implemented in the Lucas Nulle practice modules 利用simulink电气库对SVPWM控制进行效率分析，并在Lucas Nulle实践模块中实现
Dyna-Colombia Pub Date : 2023-08-01 DOI: 10.15446/dyna.v90n227.107141
Franklin Israel Sánchez-Gamboa
{"title":"Efficiency analysis of the SVPWM control using the simulink electrical library and implemented in the Lucas Nulle practice modules","authors":"Franklin Israel Sánchez-Gamboa","doi":"10.15446/dyna.v90n227.107141","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.107141","url":null,"abstract":"The purpose of this research is to analyze the efficiency of an induction motor controller, using space vector pulse width modulation (SVPWM) in open loop. With a constant torque of 1.5 Newton per meter. It is carried out by applying the mathematical model, the formulas for commutation times and space vectors in Simulink taking into account the maximum and minimum values of operation by applying the SVPWM method to generate the trigger signal in the Insulated Gate Bipolar Transistor bridge. (IGBT's), implementing the model in the Lucas Nulle practice module, taking the power data and calculating the efficiency to compare with the mathematical model and validate, resulting that the controller efficiency varies according to the switching speed of the semiconductor block, with the operation of a motor of 0.37kW and 1KW at a speed of 200rpm the efficiency of the controller reaches a value of 72.67% in the physical model that consists of 6 IGBT's of 1 kVA and 69% in the simulated model presenting an error of 5% and a switching speed of the IGBT's of 248.641ms.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005109","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}
引用次数: 0
Production of PHA under improved culture conditions and using a new feeding model 改良培养条件和新饲养模式下PHA的生产
Dyna-Colombia Pub Date : 2023-08-01 DOI: 10.15446/dyna.v90n227.107962
Wilman Alcaraz-Zapata
{"title":"Production of PHA under improved culture conditions and using a new feeding model","authors":"Wilman Alcaraz-Zapata","doi":"10.15446/dyna.v90n227.107962","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.107962","url":null,"abstract":"Polyhydroxyalkanoates (PHAs) have become important due to their mechanical properties, which resemble those of plastics derived from petrochemicals. Despite the advantages they possess, its use is limited by production costs. In terms of the culture systems used for process improvement, fed batch systems are the most studied, since they allow higher productivity to be obtained. In this study, PHAs production was reviewed with a new feeding model against the reported exponential model and under improved culture conditions. In the results, the predictive feeding strategy allowed to improve the production of PHAs (24.1 ± 1.14 g/L) by controlling the concentration of residual substrate, with respect to the exponential model (18.1 ± 1.33 g/L), achieving a biomass concentration of 40.9 ± 1.12 g/L and a polymer productivity of 1.01 gPHA/L.h, improving the process by 25%.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005104","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}
引用次数: 0
Solving plane stress problems using EsfPlano2D educational software 使用EsfPlano2D教育软件解决平面应力问题
Dyna-Colombia Pub Date : 2023-08-01 DOI: 10.15446/dyna.v90n227.108484
Myriam Rocío Pallares-Muñoz, Wilson Rodríguez-Calderón
{"title":"Solving plane stress problems using EsfPlano2D educational software","authors":"Myriam Rocío Pallares-Muñoz, Wilson Rodríguez-Calderón","doi":"10.15446/dyna.v90n227.108484","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.108484","url":null,"abstract":"An educational computational application for analyzing plane stress problems oriented to engineering students called EsfPlano2D is presented to motivate students to study the subject and strengthen didactic strategies in the classroom. The application assists the step-by-step calculation of plane stress problems, which is a fundamental topic in teaching the subject of Mechanics of Materials in engineering careers. The application is a computer program developed in Fortran, linked to the free Computer Algebra System MAXIMA to plot Mohr’s circle of stresses. The developed tool is user-friendly and completely solves the plane stress problem, the associated deformations, and the strain energy by drawing Mohr’s circle of plane stresses. A validation case is presented with a typical example of the mechanics of materials. The results show the feasibility of using custom-designed tools to strengthen classroom learning and autonomous work.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005117","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}
引用次数: 0
Multi-objective optimization of multi-energy systems planning in remote zones: the Bahía Málaga Colombian case 偏远地区多能源系统规划的多目标优化:Bahía Málaga哥伦比亚案例
Dyna-Colombia Pub Date : 2023-08-01 DOI: 10.15446/dyna.v90n227.107793
Jhon Reina, Ramiro Oritz, Dany Mauricio Lopez-Santiago
{"title":"Multi-objective optimization of multi-energy systems planning in remote zones: the Bahía Málaga Colombian case","authors":"Jhon Reina, Ramiro Oritz, Dany Mauricio Lopez-Santiago","doi":"10.15446/dyna.v90n227.107793","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.107793","url":null,"abstract":"Non-Interconnected Zones (NIZ) are a challenge for countries in terms of providing energy service coverage that is both economically and environmentally sustainable. Although some microgrid planning strategies allow for scaled-down energy solutions for these areas, a solely electrical approach does not facilitate the integration of a range of energy vectors. Considering the above, this study presents a multi-objective approach to optimally scale multi-energy systems (MES) in NIZ in Colombia to minimize both costs and pollutant emissions. The methodology is based on the MOPSO algorithm, which provides a set of optimized solutions that can be selected according to multiple criteria. The capabilities of the methodology are tested through a comparative study of microgrid planning in the Bahía Málaga area on Colombia’s Pacific coast. The results present solutions with lower costs and lower environmental impact, benefits that can be applied in other NIZ worldwide.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"16 Suppl 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005108","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}
引用次数: 0
Multi-criteria decision analysis to support the acquisition of PCR equipment for the detection of COVID-19 in Colombia 开展多标准决策分析，支持购买哥伦比亚检测COVID-19的聚合酶链反应设备
Dyna-Colombia Pub Date : 2023-08-01 DOI: 10.15446/dyna.v90n227.107276
Julián Barragán-López, Yeferson Caicedo-Mejía, Mauricio Gómez, Nataly Solano-Cristiano, Laura Bocanegra-Villegas, Sandra Usaquén-Perilla
{"title":"Multi-criteria decision analysis to support the acquisition of PCR equipment for the detection of COVID-19 in Colombia","authors":"Julián Barragán-López, Yeferson Caicedo-Mejía, Mauricio Gómez, Nataly Solano-Cristiano, Laura Bocanegra-Villegas, Sandra Usaquén-Perilla","doi":"10.15446/dyna.v90n227.107276","DOIUrl":"https://doi.org/10.15446/dyna.v90n227.107276","url":null,"abstract":"Este estudio propone un análisis multicriterio para priorizar las alternativas de equipos utilizados en el procesamiento de pruebas de RT-PCR para la detección del virus SARS-CoV-2 a través del hisopado nasofaríngeo. Se empleó el Proceso de Análisis Jerárquico (AHP) basado en la Evaluación de Tecnologías en Salud (ETES) para llevar a cabo este análisis. Para su desarrollo, primero se realizó una revisión bibliográfica para identificar los cinco criterios y doce subcriterios incluidos que facilitan la toma de decisiones en la compra de equipos para el procesamiento de pruebas RT-PCR; posteriormente se caracterizó el proceso de uso de la tecnología en una institución prestadora de salud. Los resultados obtenidos revelaron que la efectividad clínica y la seguridad fueron los criterios más relevantes en la selección de la tecnología propuesta. Para comprobar la utilidad de la herramienta multicriterio, se evaluaron dos equipos específicos.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005105","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}
引用次数: 0
ANALYTICAL DEFLECTIONS AND STRESS ANALYSIS IN SLENDER BAR FRAMED STRUCTURES SUBJECTED TO ANTISYMMETRIC LATERAL LOADS 反对称横向荷载作用下细杆框架结构的挠度和应力分析
Dyna-Colombia Pub Date : 2023-07-10 DOI: 10.6036/10869
Ignacio HERRERA NAVARRO, Daniel Rodríguez Jorge
{"title":"ANALYTICAL DEFLECTIONS AND STRESS ANALYSIS IN SLENDER BAR FRAMED STRUCTURES SUBJECTED TO ANTISYMMETRIC LATERAL LOADS","authors":"Ignacio HERRERA NAVARRO, Daniel Rodríguez Jorge","doi":"10.6036/10869","DOIUrl":"https://doi.org/10.6036/10869","url":null,"abstract":"Mechanical analysis of the lateral deflections in slender structures is an interesting task to model the mechanical response to transverse forces like seismic or wind forces. Special interest is focused on buildings, communication towers, or tower cranes, as well as any other kind of framed structures. A pure analytical solution for the lateral deflections and vertical displacements, stresses and bending moments of a framed structure under power-law lateral loads is presented in a non-dimensional form. The internal forces of the structure are stated by the force method which drives to a set of linear equations, which are analytically solved, thus reaching an exact, continuous, and differentiable solution. A parametric analysis is performed on a simplified case to show the influence of the dimensionless parameters on the solution. An explicit solution for deflections and bending moments is included for one and two structural levels. The solution is validated via numerical software, using STR and ABAQUS, upon a population of ten, building-like structures.\u0000Keywords: structure, deflections, force method, tower, building, lateral load, non-dimensional, antisymmetric","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48885429","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}
引用次数: 0
AUTOMATIC RECOGNITION OF AUTOMOBILES USING MACHINE LEARNING 使用机器学习的汽车自动识别
Dyna-Colombia Pub Date : 2023-07-07 DOI: 10.6036/10673
R. Guzmán Cabrera, Deborah Martínez, M. TORRES CISNEROS, D. MAY ARRIOJA, Mary Carmen PEÑA GOMAR
{"title":"AUTOMATIC RECOGNITION OF AUTOMOBILES USING MACHINE LEARNING","authors":"R. Guzmán Cabrera, Deborah Martínez, M. TORRES CISNEROS, D. MAY ARRIOJA, Mary Carmen PEÑA GOMAR","doi":"10.6036/10673","DOIUrl":"https://doi.org/10.6036/10673","url":null,"abstract":"In this work, we perform the automatic classification of 1,000 images of five different models of automobiles. To obtain the highest precision, we have used two different classification scenarios, three algorithms, and five metrics. Also, we assume that the results can be improved by extracting the image characteristics using descriptors and using them as input. Then, we used two descriptors: a histogram of oriented gradient and a convolutional neural network ResNet-50. Our results show that the descriptors improve the classification results and obtain the highest value for the accuracy metric of 88.01 % using the ResNet-50 as a descriptor, the Training and Test Set as a scenario, and Vector Support Machine as the classification algorithm.\u0000\u0000Keywords: Convolutional Neural Networks, Gradient Oriented Histogram, Machine Learning, Fine Grain Classification, Car Images.","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43867249","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}
引用次数: 0
HIERARCHICAL ENERGY MANAGEMENT STRATEGY BASED ON THE MAXIMUM EFFICIENCY RANGE FOR A MULTI-STACK FUEL CELL HYBRID POWER SYSTEM 基于最大效率范围的多堆燃料电池混合动力系统分层能量管理策略
Dyna-Colombia Pub Date : 2023-07-01 DOI: 10.6036/10857
Yingmin Wang, Ying Han, Wei-rong Chen, A. Guo
{"title":"HIERARCHICAL ENERGY MANAGEMENT STRATEGY BASED ON THE MAXIMUM EFFICIENCY RANGE FOR A MULTI-STACK FUEL CELL HYBRID POWER SYSTEM","authors":"Yingmin Wang, Ying Han, Wei-rong Chen, A. Guo","doi":"10.6036/10857","DOIUrl":"https://doi.org/10.6036/10857","url":null,"abstract":"A multi-stack fuel cell hybrid power system (MFCHS) consists of multiple sources with various characteristics. The power distribution between different sources influences the performance of the system, which involves many factors. To distribute the power effectively and enhance the efficiency and fuel economy of a single-stack fuel cell system, this study proposed a hierarchical energy management strategy (EMS) for MFCHS. An MFCHS configuration that included three fuel cell systems and a battery was presented. An MFCHS model that incorporated the effect of altitude was constructed, and an efficiency analysis of the multi-stack fuel cell system (MFCS) was performed. The hierarchical EMS of MFCHS was composed of a bottom control layer and a top management layer. The bottom control layer utilized a coordinated optimal distribution strategy based on the maximum efficiency range of MFCS to realize optimal power allocation between the different fuel cells in MFCS. The top management layer used EMS under multiple operating conditions to realize the effective distribution of the demand power between MFCS and the battery. Results demonstrate that the proposed strategy improves the average efficiency of MFCS by up to 5.2% and 8.9% compared with those of the equal distribution and daisy chain strategies, respectively. The proposed strategy also displays good performance in terms of the hydrogen consumption of MFCS, which saved 1% and 3% hydrogen compared with the equal distribution and daisy chain strategies, respectively. The proposed strategy results in promising improvements in the overall performance of the system. This study provides a good reference for developing EMS for MFCHS.\u0000\u0000Keywords: Fuel cell, Multi-stack fuel cell hybrid power system, Energy management strategy, Coordinated optimal distribution, Maximum efficiency range","PeriodicalId":50565,"journal":{"name":"Dyna-Colombia","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43501057","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}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信