TECCIENCIA最新文献

{"title":"Domestic Hot Water Consumption Profiles Applied to a Flat Tubular Collector for Solar Water Heating in Bogotá","authors":"Juan Andres Avila Carraznza, Carlos Mario Rocha, Juan Sebastian Solis Chavez","doi":"10.18180/tecciencia.2020.31.3","DOIUrl":"https://doi.org/10.18180/tecciencia.2020.31.3","url":null,"abstract":"The use of Flat Solar Collectors for the generation of Domestic Hot Water (DHW), facilitates access to this resource in an efficient, economical and sustainable way. The Sustainable Development Goals proposed by the UN, referring specifically to sustainable water management and access to renewable energy, are the main motivation for this work, since the former is an essential vital resource and its access reduces the inequality index, in developing countries such as Colombia, while the use of solar thermal energy reduces the environmental impact of the water heating process, thus reducing the consumption of electrical energy in the residential sector. Therefore, this work proposes to estimate DHW profiles through a spreadsheet that models the DHW flow thermodynamically for a whole year, making it possible to evaluate the energy performance of a Solar Collector available in the Colombian market and that is used in four types of dwellings located in the city of Bogotá. The simulation results present the DHW consumption profiles in kg/h per year, with DHW temperatures of up to 21°C, for a total transmitted irradiance of the order of 1100 W/m^2, which produces thermal energy close to 1kW. This comparative analysis allows us to review the technical and economic feasibility of solar collectors installed in single-family homes and with a DHW consumption profile close to the Colombian socio-economic reality","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42506291","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":"Aspectos Jurídicos en Tiempos del COVID 19","authors":"Marco Antonio Ruiz Nieves","doi":"10.18180/aspectosjuridicosentiemposdelcovid19","DOIUrl":"https://doi.org/10.18180/aspectosjuridicosentiemposdelcovid19","url":null,"abstract":"","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41979866","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":"Modelos Gráficos Probabilísticos Aplicados al Análisis Espacial en R: Hurtos de Celulares en Bogotá","authors":"Danna Cruz Reyes","doi":"10.18180/tecciencia.2019.29.2","DOIUrl":"https://doi.org/10.18180/tecciencia.2019.29.2","url":null,"abstract":"Resumen. Los avances tecnológicos recientes permiten la recopilación, el procesamiento y el almacenamiento de información a gran escala. Esto ha determinado el comienzo del big data , donde el aumento de la información ha dado lugar a conjuntos de datos grandes y complejos que pueden ser po-tencialmente explotados para encontrar soluciones a problemas relevantes","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47611715","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":"Status of astronomy Outreach in Chile","authors":"F. Char","doi":"10.18180/tecciencia.2019.29.4","DOIUrl":"https://doi.org/10.18180/tecciencia.2019.29.4","url":null,"abstract":"Currently, astronomy outreach in Chile is in good health. There is atleast a dozen research groups belonging to universities, and most ofthem also include a specific area for Education and Public Outreach(EPO), using resources to communicate astronomy to the public. Amateur astronomy, astrotourism and astronomy clubs at schools are alsoimportant actors in astronomy outreach, as well as recent initiativesfrom the government recognizing the dark skies as our natural heritage, and promoting science as a useful tool for knowledge and development. This presentation summarizes some of these initiatives,focusing on creating new educative materials establishing alliances,and finally discussing how these efforts could consolidate the leadership of Chile in astronomy education, and how we could create newopportunities in South America on this topic.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45392296","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":"Scheduling of Flow Shop Production Systems with Particle Swarm Optimization","authors":"L. Leguizamon, L.A Leguizamon, C. Leguizamón","doi":"10.18180/tecciencia.2021.31.1","DOIUrl":"https://doi.org/10.18180/tecciencia.2021.31.1","url":null,"abstract":"","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67507917","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":"Air quality trend and proposal of a web application for the atmospheric monitoring network in Tabasco, México.","authors":"Elizabeth Magaña Villegas, M. López","doi":"10.18180/tecciencia.28.02","DOIUrl":"https://doi.org/10.18180/tecciencia.28.02","url":null,"abstract":"How to cite: Magaña E. et al., Air quality trend and proposal of a web application for the atmospheric monitoring network in Tabasco, México., TECCIENCIA, Vol. 15, No. 28, 15-28, 2020 DOI:http://dx.doi.org/10.18180/tecciencia.28.2 ABSTRACT Air pollution is an increasingly concerning problem given it constitutes a risk for people’s health and the environment. In Mexico, there are some regions where society does not know the conditions of air quality, and in some others this information is not used or analyzed. Hence is important the study of air quality evolution to generate strategies that allow to mitigate adverse effects on population. In this research we analyze the trend of Criteria Air Pollutants (PM10 and O3 and CO), considering the distribution of good, regular and bad days for air quality, as well as the trend of hourly, daily, monthly and annual concentrations in the city of Villahermosa, Tabasco between 2011-2017, with information provided by the State government, in order to design an effective communication mechanism. We obtained air quality indicators based on the official Mexican regulation and the temporal behavior of the pollutants. Additionally, we trained artificial neural network models for the prediction of air pollutant concentration. Finally, we propose the design of a web portal for the communication of air quality. According to the weekly behavior, is shown that we are exposed daily to potential health hazards by any of the air pollutants, also that the second trimester of each year shows the worst conditions and that the pollutants that have a greater contribution to air pollution in the city are CO, PM10 andO3. Likewise, the tendencies of PM10 andO3 indicate a slow decrease of -0.5 ug/m3-year, -0.0004 ppm-year respectively, which requires a redefinition of government strategies that may potentiate their decrease. In this sense, the web portal is proposed under two main approaches: First, with the purpose of communication, aimed to the society so it can take preventive measures on their exposure to high contamination levels. The second approach is aimed to the academic community and government authorities, with graphic information on the criteria air pollutants’ tendencies, providing analytical elements for structuring environmental policies.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47746423","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":"Novel Design of polycrystalline CdTe/Si Tandem Solar Cells Using SiO2/TiO2 Distributed Bragg Reflector","authors":"Amirreza Rouhbakhshmeghrazi, M. Madadi","doi":"10.18180/tecciencia.28.6","DOIUrl":"https://doi.org/10.18180/tecciencia.28.6","url":null,"abstract":"In this paper, a polycrystalline cadmium telluride/silicon ( CdTe / Si ) solar cell based on SiO 2 / TiO 2 distributed Bragg reflector (DBR) is proposed and investigated using calibrated simulations with experimental data of previous fabrication device. At first, by inserting the SiO 2 / TiO 2 DBR, the conversion efficiency is increased by about 25 % compared with the conventional CdTe / Si solar cell with similar dimen-sions. In addition, the carrier lifetime of absorber layer can provide an improved conversion efficiency of 15% compared with the CdTe / Si conventional solar cell. The obtained open circuit voltage, short circuit current density, fill factor and con-versionefficiencyofproposedsolarcellstructurewereabout 1 . 2 V, 39 . 5 mA / cm 2 , 0 . 95 and 28 . 5% under global AM 1 . 5 conditions, respectively. The results strongly con-firm that the polycrystalline CdTe / Si solar cell based on SiO 2 / TiO 2 DBR seems to be the most optimal choice for converting the solar energy in high efficiency photovoltaics systems. confirman que la celda solar policristalina CdTe / Si basada en SiO 2 / TiO 2 DBR es una opción más óptima para convertir la energía solar en sistemas fotovoltaicos de alta eficiencia. (DBR).","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45429758","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":"ANÁLISIS AERODINÁMICO DE LA AERONAVE USB AERO MEDIANTE DINÁMICA DE FLUIDOS COMPUTACIONAL","authors":"Juan Sebastián Sánchez Ocampo, Jordy Francisco Tamayo Andrade, Sergio Andres Lopez Aragon, R. Cerpa","doi":"10.18180/tecciencia.28.5","DOIUrl":"https://doi.org/10.18180/tecciencia.28.5","url":null,"abstract":"The present research study presents the results of the aerodynamic analysis of a USB AERO aircraft using computational fluid dynamics (CFD) in operational conditions of cruise flight at an angle of attack of  3.5 degrees. The ANSYS FLUENT computational tool was used, with which the lift, drag and longitudinal momentum coefficients were determined. Additionally, the aircraft was analyzed at different angles of attack in order to determine aerodynamic characteristics such as the highest lift coefficient and the loss angle, in addition to establishing the maximum aerodynamic efficiency.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42086861","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":"Semantic Model Representation In Colombian Computer Law","authors":"Juan Fernando Rojas, Julio Barón Velandia, Paulo Alonso Gaona García","doi":"10.18180/tecciencia.28.4","DOIUrl":"https://doi.org/10.18180/tecciencia.28.4","url":null,"abstract":"Ontological representations in different domains of reality enable the creation of conceptual relationships that can be coded to reuse and share knowledge. The present article proposes a semantic model representation in Colombian computer law through the methodological process of Methontology. This proposal is the first approximation of a legal semantic model in Colombia that allows structuring searches founded on inferences to obtain information with a high degree of relevance for lawful expert users. The queries of the proposed model are made by semantic content, contrasting to the current legal information search engines which execute queries by textual coincidence.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41819735","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":"Design of a Digital Tool for Communication and Analysis of Air Quality in Tabasco, Mexico.","authors":"Elizabeth Magaña Villegas, M. López, Sergio Ramos Herrera, Jesús Manuel Carrera Velueta, O. Peralta","doi":"10.18180/tecciencia.28.3","DOIUrl":"https://doi.org/10.18180/tecciencia.28.3","url":null,"abstract":"Air pollution is an increasingly concerning problem given it constitutes a risk for people’s health and the environment. In Mexico, there are some regions where society does not know the conditions of air quality, and in some others this information is not used or analyzed. Hence is important the study of air quality evolution to generate strategies that allow to mitigate adverse effects on population. In this research we analyze the trend of Criteria Air Pollutants (PM 10 , O 3 and CO), considering the distribution of good, regular and bad days for air quality, as well as the trend of hourly, daily, monthly and annual concentrations in the city of Villahermosa, Tabasco between 2011-2017, with information provided by the State government, in order to design an effective communication mechanism. We obtained air quality indicators based on the official Mexican regulation and the temporal behavior of the pollutants. Additionally, we trained artificial neural network models for the prediction of air pollutant concentration. Finally, we propose the design of a web portal for the communication of air quality. According to the weekly behavior, is shown that we are exposed daily to potential health hazards by any of the air pollutants, also that the second trimester of each year shows the worst  conditions and that the pollutants that have a greater contribution to air pollution in the city are CO, PM 10 and O 3 . Likewise, the tendencies of PM 10 and O 3 indicate a slow decrease of -0.5 ug/m3-year, -0.0004 ppm-year respectively, which requires a redefinition of government strategies that may potentiate their decrease. In this sense, the web portal is proposed under two main approaches: First, with the purpose of communication, aimed to the society so it can take preventive measures on their exposure to high contamination levels. The second approach is aimed to the academic community and government authorities, with graphic information on the criteria air pollutants’ tendencies, providing analytical elements for structuring environmental policies.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43229198","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}