Nexo Revista Científica最新文献

{"title":"Gomero manchado producido en Brasil para madera maciza estructural: una caracterización física y mecánica","authors":"M. Nogueira, V.A. De Araujo, J. S. Vasconcelos, C. M. Gutiérrez-Aguilar, A. L. Christoforo, F. Lahr","doi":"10.5377/nrc.v37i01.18321","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18321","url":null,"abstract":"Numerosas especies maderables requieren una caracterización detallada para comprender su potencial estructural. La madera maciza de gomero manchado se encuentra entre tales especies en las que también se requiere conocer sus propiedades para la construcción. En el presente estudio se buscó examinar 16 propiedades físico-mecánicas de la madera del gomero manchado (Corymbia maculata) para promover su uso en la producción de construcciones bio-basadas más sostenibles. Utilizando la norma técnica brasileña NBR7190, se evaluaron dos niveles de humedad estable para averiguar el comportamiento de la madera, el primero en el punto de saturación al 30 % y el segundo en punto seco estandarizado al 12 %. 13 árboles del gomero manchado con diferentes edades fueron extraídos de diferentes bosques plantados en Brasil para obtener muestras de sus troncos. Así, se analizaron 1959 determinaciones para evaluar los resultados mediante la prueba de t con un nivel de significancia del 5 %. A partir de nuestros análisis representativos, estadísticos y comparativos, se confirmó que el gomero manchado es adecuado para usos estructurales, siendo una madera potencial en las regiones tropicales y subtropicales de América Latina.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"2 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661586","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 web application for post-processing seismic hazard assessment results","authors":"Leonardo Alvarez, Conrad Lindholm","doi":"10.5377/nrc.v37i01.18320","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18320","url":null,"abstract":"A web application for post-processing of PSHA results in order to obtain a variety of maps and graphics for user-defined needs is discussed. It was developed for using the results from the R-CRISIS software main calculations, but its principles are universal and may be adapted for any other PSHA software. The process is performed in two steps: the first is to prepare files to be used as input for the web application, and the second step consists of processing these files for new results and plots (trough the execution of programs and scripts). The work is organized in a server-client scheme, where the server side has all the required software together with the results and input files from the PSHA calculation. The software is accessed through a Web-Portal on the server side. We present examples of requests and results.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"15 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141662439","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":"Qualitative analysis about best practices and project management tools in intralogistics","authors":"J. A. Báez Jiménez, J. C. Hernández-González, M. A. Román-del-Valle","doi":"10.5377/nrc.v37i01.18330","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18330","url":null,"abstract":"Project management in automotive manufacturing is crucial due to the dynamism in updating operating models and high investment in the supply chain and logistics. This article presents a systematic literature review of 134 articles (2011-2023) from four relevant databases (IEEE, ScienceDirect, Scopus, Taylor & Francis) with the purpose of exploring the best practices in project management applied in intralogistics activities. Analyzing aspects such as country, management methods and techniques, solution levels in internal logistics projects, business line, among other items. The findings will identify opportunities that contribute to academic indicators and the generation of proposals in the automotive industry in Mexico, focused on the fulfillment of projects and management according to their context.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"51 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141660076","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":"Nexo Editorial Letter","authors":"Néstor Saúl López Irías","doi":"10.5377/nrc.v37i01.18314","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18314","url":null,"abstract":"","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"14 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661289","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":"Seguimiento de los cambios en el uso del suelo y la cobertura del suelo utilizando tecnicas de teledeteccion y SIG en la Isla de Phu Quoc, Provincia de Kien Giang, Vietnam","authors":"Bui B. Thien, Andrey N. Kuznetsov, Vu T. Phuong","doi":"10.5377/nrc.v37i01.18331","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18331","url":null,"abstract":"The changes in land use and land cover (LULC) are among the primary drivers of global environmental changes in many developing countries. In this study, LULC changes were assessed on Phu Quoc Island, located in Kien Giang province, Vietnam, from 2001 to 2022. The study utilized remote sensing and Geographic Information System (GIS) technology using Landsat images for the years 2001, 2009, and 2022. Image classification for each year was conducted through supervised classification using a maximum likelihood classifier, with the main LULC classes being forests, bare land, agricultural areas, water bodies, and built-up areas. The accuracy of the classification was evaluated using the kappa coefficient, achieving values consistently above 0.8 for all three images. Over the 20-year period (2001-2022), the area of forest, agriculture, and water bodies decreased by 14.90 km2, 30.96 km2, and 0.64 km2, respectively. Meanwhile, the areas of bare land and built-up areas increased by 22.22 km2 and 24.28 km2, respectively. Additionally, this study employed the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Built-up Index (NDBI) to quickly assess LULC changes, obtaining results consistent with the supervised classification. The findings underscore the importance of closely monitoring LULC changes to facilitate effective natural resource management and maintain a sustainable environment.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"9 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141660319","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":"Analysis of dry matter and bromatological compounds of fruit and vegetable products from western Honduras","authors":"Juan Alexander Torres Mejía, Fredy Torres Mejía","doi":"10.5377/nrc.v37i01.18323","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18323","url":null,"abstract":"Este trabajo se centra en la evaluación del rendimiento de 23 productos hortofrutícolas de la región del Occidente de Honduras, se determinó materia seca y contenido de humedad en las materias primas, en una muestra de 100 (g) de fruta fresca, de igual manera se determinó mediante análisis bromatológico, en una muestra de materia seca del 100 (g), se estableció el porcentaje de participación de proteína, hidratos de carbono, extracto etéreo o lipídico, fibra y ceniza de cada producto estudiado, se evaluó preparando dos repeticiones de cada muestra y/o tratamiento, a 105 grados celsius y tiempo entre seis (6 hr) a (12 hr), diseñando el potencial predictivo relativa de un modelo exponencial, está denotada, los R² igual o mayor si su nivel de significación es 0.05, el correspondiente nivel de confianza mayor igual a 0.95, obteniendo el siguiente resultado. \u0000  \u0000La cebolla nombre científico (Allium cepa) variedad amarilla o Vidalia, R² = 0.9848, potencial de predicción de un modelo exponencial está denotada R² entre más cercana a 1 es mejor es el modelo de ecuación exponencial, papa sin cáscara (Solanum tuberosum), potencial de predicción  R² = 0.9865, mango verde tierno (Mangifera indica), R² = 0.9734, Fresa (Fragaria × ananassa), R² = 0.9785, papa con cáscara (Solanum tuberosum), R² = 0.9616, Tomate (Solanum lycopersicum), variedad Cherokee, R² = 0.964, Zanahoria con cáscara (Daucus carota), R² = 0.9621, Chile (Capsicum annuum), variedad Jalapeño, R² = 0.9674, Piña con cáscara (Ananas comosus), variedad azucaron, R² = 0.9548, Melón con cáscara (Cucumis melo), variedad cantaloupe, R² = 0.9548; Intervalo de confianza  a 95%, se debe mejorar los protocolos, para lograr eficiencia en la predicción ejemplo manzana verde importada (Granny Smith), la potencia predictiva relativa de un modelo exponencial está denotada por R² = 0.9409, chayote (Sechium edule), R² = 0.9167, chile morrón de color verde (Capsicum annuum), predicción estadística de R² = 0.9058, Aguacate (Persea Americana) variedad Hass, R² = 0.9135, Sandía con cáscara (Citrullus lanatus), R² = 0.9406. \u0000En las siguientes muestras del ensayo es necesario mucha más investigación, ya que el potencial predictivo relativo de un modelo exponencial, está por debajo de 90%, lo más recomendable es hacer más repeticiones en nuevas investigaciones para optimizar el modelo de predicción de la curva exponencial, Rambután pulpa (Nephelium lappaceum), potencial de predicción de R² = 0.6879, piña pulpa (Ananas comosus), variedad azucaron, R² = 0.8332, Rambután con cáscara (Nephelium lappaceum), R² = 0.8002, esto probablemente debido a que los tiempos de peso de muestras no fueron eficientes, temperatura del horno no homogénea, muestras más cercanas a la resistencia del horno experimentan mayor pérdida de humedad, por lo cual se debe establecer los protocolos adecuados para lograr un experimento con mayor nivel de confianza, para las muestras por debajo de 95%. \u0000Con la estimación de las variables térmicas como se","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"12 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141659920","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":"Characterization of natives starches and their effect on physical properties of water-based drilling fluids","authors":"Rubén Vega-Mejía","doi":"10.5377/nrc.v37i01.18333","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18333","url":null,"abstract":"La investigación tuvo como propósito comparar las propiedades funcionales de cinco almidones (ocumo, yuca, mapuey, ñame congo y caña agría) desarrollados en la universidad y conocer su efecto al ser usados como controladores de filtrado sobre las propiedades físicas de un fluido base agua. Durante el estudio de las propiedades funcionales se detectó en los almidones buen contenido de amilosa, necesaria para el buen desempeño de los fluidos de perforación, pH ácido característico de los almidones naturales y buen rendimiento para la adsorción de agua. Los fluidos formulados presentaron buena reología y filtrado menor a diez para los almidones de ocumo, yuca y caña agría. Caso opuesto los almidones de mapuey y ñame congo cuyo valor fueron superiores a diez. El diseño factorial evidenció diferencias estadísticas significativas entre los almidones (bloques) con respecto al comercial, más no entre este y almidón de caña agria. Igualmente, hubo diferencias estadísticas entre las propiedades físicas de los almidones con el comercial, excepto el almidón de caña agría que solo difirió en el filtrado respecto al comercial. A pesar de los resultados, no se descartan los otros fluidos, porque su uso depende de las condiciones operativas de perforación.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141660034","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":"Evaluation of the photocatalytic activity of the FN1® coating on ignimbrite (sillar) in Arequipa - Peru","authors":"L.L. Ramos Villa, J.C. Santiago Contreras, R.B. Guzman Ale","doi":"10.5377/nrc.v37i01.18322","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18322","url":null,"abstract":"Se ha evaluado la actividad fotocatalítica de una suspensión de dióxido de titanio comercial (FN1), depositado sobre una piedra de ignimbrita porosa, muy utilizada como material de construcción en Arequipa-Perú, con el fin de generar superficies con propiedades autolimpiantes en edificios urbanos. Se aplicó la suspensión sobre una cara del sustrato de ignimbrita por dos métodos: pulverizado y brocha. Para evaluar que su aplicación no altere el aspecto físico de la superficie del sustrato de ignimbrita, se determinó las coordenadas del color por el método CieLab, después de la aplicación del FN1 dando una variación total máxima de 2.49; mostrando una buena compatibilidad visual del revestimiento con la superficie de la ignimbrita. La actividad fotocatalítica se evaluó mediante el uso de pruebas de fotoblanqueo con los colorantes 2,6-dicloroindofenol (DCIP) y azul de metileno (AM), bajo irradiación de luz solar simulada. La mayor eficiencia fotocatalítica se obtuvo con el sustrato de ignimbrita recubierta con 3 capas por pulverización de FN1, que mostró una fotodegradación de AM y DCIP de 75,07% y 100% a los 120 min y 5 min de irradiación, respectivamente.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"25 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661703","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":"Carta Editorial Nexo","authors":"Néstor Saúl López Irías","doi":"10.5377/nrc.v37i01.18316","DOIUrl":"https://doi.org/10.5377/nrc.v37i01.18316","url":null,"abstract":"","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"11 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141660141","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":"Validation of chirps gauge – satellite based rainfall dataset over Nicaragua, 2011 - 2021","authors":"Jassy D. Rivera Solís, Edwin. A. Ojeda Olivares, Francisco E. Chamorro Blandón","doi":"10.5377/nexo.v36i05.17284","DOIUrl":"https://doi.org/10.5377/nexo.v36i05.17284","url":null,"abstract":"Rainfall is a key input for many weather and climate numerical models. Therefore the strong need to have a dense enough monitoring network for this parameter. Satellite-based rainfall products have emerged in recent decades as an alternative to the more expensive gauge stations. However, a proper validation of such satellite-based products against gauge data must be performed before using their data. This study presents a validation of CHIRPS dataset against gauge data for 17 stations across Nicaragua. The performance of the product was validated at different temporal scales (daily, pentadal, monthly and annual) by different error metrics. A total of six quantitative error metrics was assessed: Bias Percentage (PBIAS), Mean Error (ME), Mean Absolute Error (MAE), Root Mean Square Error (RMSE), Pearson’s r and Nash Stucliffe Efficiency (NSE). A total three categorical indices were assessed at daily time scale: Probability of Detection (POD), False Alarm Ratio (FAR) and Critical Success Index (CSI). The results showed that CHIRPS dataset have better performance at monthly and annual time scales, while it is not capable of adequately represent the daily variability.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139200561","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}