El objetivo del estudio era desarrollar un sistema de prueba basado en la amplificación isotérmica mediada por bucle con detección por hibridación-fluorescencia para detectar el ADN del virus de la peste porcina africana en presencia de una muestra de control interno. Como parte del estudio, se determinaron las condiciones óptimas de amplificación, se seleccionó un método de extracción de ácidos nucleicos y se analizó la amplificación de muestras positivas y negativas. Se llevó a cabo un análisis estadístico para determinar la reproducibilidad del estudio del sistema de prueba desarrollado. Se estudiaron las características genéticas del virus de la peste porcina africana y se identificó el fragmento del genoma más prometedor para la identificación específica de este patógeno, el gen de la proteína p72 de la cápside mayor. Se seleccionaron oligonucleótidos para la amplificación isotérmica de la diana. Los resultados del estudio son valiosos desde el punto de vista de futuros avances en virología, epidemiología y diagnóstico, y también pueden ser utilizados por organizaciones e instituciones implicadas en el control y la prevención de enfermedades animales, en particular la peste porcina africana.
{"title":"Análisis estadístico de la determinación de la reproducibilidad del estudio del sistema de prueba desarrollado para la detección del ADN del virus de la peste porcina africana","authors":"Larisa Gnezdilova, Sergey Pozyabin, Marina Selina, Seidfatima Borunova","doi":"10.5377/nexo.v36i04.16817","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16817","url":null,"abstract":"El objetivo del estudio era desarrollar un sistema de prueba basado en la amplificación isotérmica mediada por bucle con detección por hibridación-fluorescencia para detectar el ADN del virus de la peste porcina africana en presencia de una muestra de control interno. Como parte del estudio, se determinaron las condiciones óptimas de amplificación, se seleccionó un método de extracción de ácidos nucleicos y se analizó la amplificación de muestras positivas y negativas. Se llevó a cabo un análisis estadístico para determinar la reproducibilidad del estudio del sistema de prueba desarrollado. Se estudiaron las características genéticas del virus de la peste porcina africana y se identificó el fragmento del genoma más prometedor para la identificación específica de este patógeno, el gen de la proteína p72 de la cápside mayor. Se seleccionaron oligonucleótidos para la amplificación isotérmica de la diana. Los resultados del estudio son valiosos desde el punto de vista de futuros avances en virología, epidemiología y diagnóstico, y también pueden ser utilizados por organizaciones e instituciones implicadas en el control y la prevención de enfermedades animales, en particular la peste porcina africana.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135968091","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16792
Saad AlFlayyeh, Abdullah Albulayhid
Present study core aim was to investigate the impact of health care administration ultimately on patient behavior. Study was conducted in Riyadh Saudi Arabia. Study was conducted in Riyadh private health clinics. Total 4 (Four) constructs were considered and four hypotheses were developed. Based on the study framework, the research questions were developed and answered through the study findings. Total of 320 surveys questionnaire were distributed among the visitors or the attendants with the patients. However, valid responses were counted as 281. Data set then prepared while using SPSS version 23. All the necessary tests were conducted, such as Cronbach alpha, standard deviation, mean value calculation, hypotheses testing etc. Links between the hypotheses shows the positive association with the assumed relationship.
本研究的核心目的是调查医疗管理对患者行为的最终影响。研究是在沙特阿拉伯的利雅得进行的。研究是在利雅得的私人诊所进行的。总共考虑了4个构念，并提出了4个假设。在研究框架的基础上，制定研究问题，并通过研究结果回答研究问题。共发放调查问卷320份给来访人员或陪护人员。然而，有效回复数为281。然后使用SPSS version 23准备数据集。进行了所有必要的检验，如Cronbach alpha、标准差、均值计算、假设检验等。假设之间的联系显示了与假设关系的正相关。
{"title":"An integrative framework of health care administration and its impact on patient behavior: an empirical investigation of private clinics in Riyadh, Saudi Arabia","authors":"Saad AlFlayyeh, Abdullah Albulayhid","doi":"10.5377/nexo.v36i04.16792","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16792","url":null,"abstract":"Present study core aim was to investigate the impact of health care administration ultimately on patient behavior. Study was conducted in Riyadh Saudi Arabia. Study was conducted in Riyadh private health clinics. Total 4 (Four) constructs were considered and four hypotheses were developed. Based on the study framework, the research questions were developed and answered through the study findings. Total of 320 surveys questionnaire were distributed among the visitors or the attendants with the patients. However, valid responses were counted as 281. Data set then prepared while using SPSS version 23. All the necessary tests were conducted, such as Cronbach alpha, standard deviation, mean value calculation, hypotheses testing etc. Links between the hypotheses shows the positive association with the assumed relationship.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135040985","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16799
Anatoly Ragimkhanov, Irina Zhukovskaya
The purpose of the article is to develop theoretical provisions and methodological support for assessing the competitiveness of tourist services as the basis of a tourist destination. And the methods of factor analysis, the method of multi-criteria assessment, the correlation-regression method, the methods of indicative planning and economic and mathematical modeling were used. Some problems have been solved using comparison and linear optimization methods. The article explores theoretical and methodological approaches to the evaluation of tourist services in a constantly changing competitive environment and the actualization of new technologies. The methods of assessing and transforming the quality and increasing the competitiveness of tourist services within the regional recreation and tourism market were studied using the example of the Republic of Tatarstan, which predetermined the relevance of the stated topic, the purpose of the study and the tasks set. The practical value is confirmed by the possibility of using the results obtained in the development strategy of tourist organizations by regional government bodies, as well as in the activities of federal and regional tour operators.
{"title":"Assessment of the competitiveness of tourism services in the region: modern realities","authors":"Anatoly Ragimkhanov, Irina Zhukovskaya","doi":"10.5377/nexo.v36i04.16799","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16799","url":null,"abstract":"The purpose of the article is to develop theoretical provisions and methodological support for assessing the competitiveness of tourist services as the basis of a tourist destination. And the methods of factor analysis, the method of multi-criteria assessment, the correlation-regression method, the methods of indicative planning and economic and mathematical modeling were used. Some problems have been solved using comparison and linear optimization methods. The article explores theoretical and methodological approaches to the evaluation of tourist services in a constantly changing competitive environment and the actualization of new technologies. The methods of assessing and transforming the quality and increasing the competitiveness of tourist services within the regional recreation and tourism market were studied using the example of the Republic of Tatarstan, which predetermined the relevance of the stated topic, the purpose of the study and the tasks set. The practical value is confirmed by the possibility of using the results obtained in the development strategy of tourist organizations by regional government bodies, as well as in the activities of federal and regional tour operators.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041156","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16795
Saad AlFlayyeh, Saad Abdulrhman Almushawah
Aim of the present study is to make satisfied the visitors (patients) through the offered services. There are private and public sector health care Centre’s in the Kingdom of Saudi Arabia, particularly in the diplomatic city of Riyadh. However, present study targeted public sector health care centers due to easy access. Later the study conceptualized a theoretical study framework and suggested the hypotheses based on the previous studies and recommendations. Thus, the study investigated the considered hypotheses for the mentioned variables. Total four (4) constructs were considered and four hypotheses were developed. Among 350 participants of the survey, valid responses were counted as 262. The collected data were analyzed through SPSS version 22. Descriptive part also included in the distributed questionnaire in order to obtained the respondents demographics. After analysis of the data, results showed all the hypotheses are having a significant relationship with each other. Findings of this study also important for the practitioners in health care sectors.
本研究的目的是使来访者(病人)对所提供的服务感到满意。沙特阿拉伯王国有私营和公共部门的保健中心，特别是在外交城市利雅得。然而，本研究的目标是公共部门的医疗保健中心，因为它们很容易进入。随后，在前人研究成果的基础上，提出了理论研究框架和假设。因此，本研究调查了上述变量的假设。总共考虑了四(4)种结构，并提出了四个假设。在350名调查参与者中，有效回复数为262份。收集的数据通过SPSS version 22进行分析。描述性部分也包括在分发的问卷中，以获得受访者的人口统计数据。通过对数据的分析，结果表明，所有的假设都具有显著的相互关系。本研究的结果对卫生保健部门的从业人员也很重要。
{"title":"An integrative framework of health administration and patient satisfaction at health-care centre’s: perspectives of Riyadh, Saudi Arabia","authors":"Saad AlFlayyeh, Saad Abdulrhman Almushawah","doi":"10.5377/nexo.v36i04.16795","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16795","url":null,"abstract":"Aim of the present study is to make satisfied the visitors (patients) through the offered services. There are private and public sector health care Centre’s in the Kingdom of Saudi Arabia, particularly in the diplomatic city of Riyadh. However, present study targeted public sector health care centers due to easy access. Later the study conceptualized a theoretical study framework and suggested the hypotheses based on the previous studies and recommendations. Thus, the study investigated the considered hypotheses for the mentioned variables. Total four (4) constructs were considered and four hypotheses were developed. Among 350 participants of the survey, valid responses were counted as 262. The collected data were analyzed through SPSS version 22. Descriptive part also included in the distributed questionnaire in order to obtained the respondents demographics. After analysis of the data, results showed all the hypotheses are having a significant relationship with each other. Findings of this study also important for the practitioners in health care sectors.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041273","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}
The purpose of this study is to investigate the effect of resilience for the selection as well as ranking suppliers with Fuzzy DEMATEL (Case study: Tabriz Compressor Manufacturing Company). The industrial engineers and production planners of Company were included in this study. For information gathering the questionnaire designed by the researchers was used. The Fuzzy DEMATEL method has been used to investigate the factors affecting resilience in the selection of suppliers. Also, Fuzzy VIKOR and COPRAS-G method has been used to compare and to represent ranking suppliers. Since COPRAS-G approach is used to analyze the different alternatives, and to estimate the alternatives based on their significance, degree of utility and the decision makers’ support to make more accurate decisions. In this regard, thirteen criteria have been selected by industrial experts. Based on the results obtained from Fuzzy DEMATEL, cost, quality, delivery time, and risk factor are ranked respectively. Additionally, after comparing Fuzzy Vikor and COPPRAS-G, the results obtained from COPRAS-G showed the best ranked amounts throughout different alternatives. Finally, the results obtained from COPRAS-G showed the traditional criteria in resilience supplier selection ranked the first and supplier selection from the stakeholders' perspectives placed in second order. Furthermore, utility values and ranking candidate alternatives showed that the green supplier (A5) ranked the first, selection of suppliers (A3) was the next, following the traditional criteria (A1), supplier criteria(A4), supplier selection from the stakeholders' perspectives (A2), as the remaining ranks, respectively.
{"title":"The effect of resilience for selection of suppliers with hybrid fuzzy mcdm","authors":"Mohammad Reza Komari Alaei, Reza Rostamzadeh, Mahdi Abdsharafat, Kadir Albayrak, Saied Abdollahi","doi":"10.5377/nexo.v36i04.16789","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16789","url":null,"abstract":"The purpose of this study is to investigate the effect of resilience for the selection as well as ranking suppliers with Fuzzy DEMATEL (Case study: Tabriz Compressor Manufacturing Company). The industrial engineers and production planners of Company were included in this study. For information gathering the questionnaire designed by the researchers was used. The Fuzzy DEMATEL method has been used to investigate the factors affecting resilience in the selection of suppliers. Also, Fuzzy VIKOR and COPRAS-G method has been used to compare and to represent ranking suppliers. Since COPRAS-G approach is used to analyze the different alternatives, and to estimate the alternatives based on their significance, degree of utility and the decision makers’ support to make more accurate decisions. In this regard, thirteen criteria have been selected by industrial experts. Based on the results obtained from Fuzzy DEMATEL, cost, quality, delivery time, and risk factor are ranked respectively. Additionally, after comparing Fuzzy Vikor and COPPRAS-G, the results obtained from COPRAS-G showed the best ranked amounts throughout different alternatives. Finally, the results obtained from COPRAS-G showed the traditional criteria in resilience supplier selection ranked the first and supplier selection from the stakeholders' perspectives placed in second order. Furthermore, utility values and ranking candidate alternatives showed that the green supplier (A5) ranked the first, selection of suppliers (A3) was the next, following the traditional criteria (A1), supplier criteria(A4), supplier selection from the stakeholders' perspectives (A2), as the remaining ranks, respectively.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041157","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16788
Vo Van Dung, Tran Nhat Minh
Sea and island economic development associated with environmental protection is an issue of concern for research. In this article, we will focus on answering three questions: Why should marine and island economic development be associated with environmental protection?; What are the benefits of protecting the marine and island environment for economic development? Is it possible to protect the marine and island environment without economic development or develop an economy without protecting the environment? To answer those three questions, we clarify the reality of economic development associated with environmental protection in Nha Trang city, Khanh Hoa province, the result of the economic development of sea and islands for environmental protection and the effect of environmental protection to the development of sea and island economy.
{"title":"Sea and island economy development with environmental protection in Nha trang city, Khanh hoa province","authors":"Vo Van Dung, Tran Nhat Minh","doi":"10.5377/nexo.v36i04.16788","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16788","url":null,"abstract":"Sea and island economic development associated with environmental protection is an issue of concern for research. In this article, we will focus on answering three questions: Why should marine and island economic development be associated with environmental protection?; What are the benefits of protecting the marine and island environment for economic development? Is it possible to protect the marine and island environment without economic development or develop an economy without protecting the environment? To answer those three questions, we clarify the reality of economic development associated with environmental protection in Nha Trang city, Khanh Hoa province, the result of the economic development of sea and islands for environmental protection and the effect of environmental protection to the development of sea and island economy.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041269","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16755
Fredy Torres Mejía, Juan Alexander Torres Mejía, Ronal Edgardo Maradiaga Pérez
Honduras es un país donde su economía es altamente dependiente de algunos rubros importante tales como el café (Coffea arábica L.). Según el Banco Central de Honduras, este producto contribuye con el 4.8% al PIB nacional y al 34.8% del PIB agrícola, ocupando el tercer lugar como rubro generador de divisas en el país solo después de la maquila y las remesas. Alrededor de 112 mil familias dependen de este cultivo, el 85% está en manos de pequeños productores (Menores de 100 quintales), el 15 restante está en manos de medianos y grandes productores. En la última década el café se ha visto afectado por la enfermedad de la roya Hemileia vastatrix, que causa graves daños a las plantaciones de café, principalmente por el mal manejo agronómico del cultivo y del efecto del cambio climático, generando un impacto socioeconómico muy inestable en todo el país y especialmente en las zonas cafetaleras como lo es la región del Paraíso, que a pesar de las medidas que se han adoptado el 60% de las fincas cafetaleras que existen en el departamento han resultado afectadas entre las dos temporadas 2011-2012/2012-2013 causando una problemática socioeconómica a los productores y a toda la cadena de valor del café, y la reducción de divisas para el país de US$ 645.1 millones por venta de café en la cosecha 2011-2012; de igual modo la cosecha ha sido afectada significativamente en la cosecha 2017-2018, causando un decline significativo en las exportaciones del grano oro, donde bajo la producción en 1.3 millones de sacos. Por lo que el gobierno y todos los actores del rubro deben desarrollar estrategias eficientes técnicas y científicas para contrarrestar la roya, y poder construir conocimiento para poder ser transferido a los productores de café que finalmente son los más afectados.
{"title":"Análisis retrospectivo del impacto socioeconómico generado por la roya del café (Hemileia vastatrix ) en el departamento del Paraíso Honduras","authors":"Fredy Torres Mejía, Juan Alexander Torres Mejía, Ronal Edgardo Maradiaga Pérez","doi":"10.5377/nexo.v36i04.16755","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16755","url":null,"abstract":"Honduras es un país donde su economía es altamente dependiente de algunos rubros importante tales como el café (Coffea arábica L.). Según el Banco Central de Honduras, este producto contribuye con el 4.8% al PIB nacional y al 34.8% del PIB agrícola, ocupando el tercer lugar como rubro generador de divisas en el país solo después de la maquila y las remesas. Alrededor de 112 mil familias dependen de este cultivo, el 85% está en manos de pequeños productores (Menores de 100 quintales), el 15 restante está en manos de medianos y grandes productores. En la última década el café se ha visto afectado por la enfermedad de la roya Hemileia vastatrix, que causa graves daños a las plantaciones de café, principalmente por el mal manejo agronómico del cultivo y del efecto del cambio climático, generando un impacto socioeconómico muy inestable en todo el país y especialmente en las zonas cafetaleras como lo es la región del Paraíso, que a pesar de las medidas que se han adoptado el 60% de las fincas cafetaleras que existen en el departamento han resultado afectadas entre las dos temporadas 2011-2012/2012-2013 causando una problemática socioeconómica a los productores y a toda la cadena de valor del café, y la reducción de divisas para el país de US$ 645.1 millones por venta de café en la cosecha 2011-2012; de igual modo la cosecha ha sido afectada significativamente en la cosecha 2017-2018, causando un decline significativo en las exportaciones del grano oro, donde bajo la producción en 1.3 millones de sacos. Por lo que el gobierno y todos los actores del rubro deben desarrollar estrategias eficientes técnicas y científicas para contrarrestar la roya, y poder construir conocimiento para poder ser transferido a los productores de café que finalmente son los más afectados.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135040982","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}
The purpose of this research was to predict customer orientation in the Iranian gas industry using the theory of planned behavior (TBH). The population of this quantitative survey con-sisted of gas industry employees, and a sample size of 384 was calculated using Cochran’s formula for infinite population. Data was collected using a questionnaire. The content validity of the instrument was verified by a panel of experts, and its construct validity and reliability were confirmed through confirmatory factor analysis and Cronbach’s alpha. Data was ana-lyzed using confirmatory factor analysis and structural equations modeling. The results showed that discipline, knowledge, moral norms, subjective norms, and perceived behavioral control have a significant positive effect on customer orientation. Moreover, planned behavior was significantly associated with customer orientation in the gas industry. Therefore, TBH can be used for predicting customer orientation in the gas industry.
{"title":"Predicting Customer Orientation Using the Theory of Planned Behavior: A Case of the Iranian Gas Industry","authors":"Zhila Mahrooz Hasanbarog, Eshaq Rasouli, Behnam Azadi","doi":"10.5377/nexo.v36i04.16785","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16785","url":null,"abstract":"The purpose of this research was to predict customer orientation in the Iranian gas industry using the theory of planned behavior (TBH). The population of this quantitative survey con-sisted of gas industry employees, and a sample size of 384 was calculated using Cochran’s formula for infinite population. Data was collected using a questionnaire. The content validity of the instrument was verified by a panel of experts, and its construct validity and reliability were confirmed through confirmatory factor analysis and Cronbach’s alpha. Data was ana-lyzed using confirmatory factor analysis and structural equations modeling. The results showed that discipline, knowledge, moral norms, subjective norms, and perceived behavioral control have a significant positive effect on customer orientation. Moreover, planned behavior was significantly associated with customer orientation in the gas industry. Therefore, TBH can be used for predicting customer orientation in the gas industry.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041144","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16752
Jesús Abraham Rojas Úrzulo, José-Joel González-Barbosa, Xochitl Yamile Sandoval Castro, Maximiano Francisco Ruiz Torres, Erick-Alejandro González-Barbosa
The inverse kinematic model uses robot design parameters: ideal link lengths and mounting angles. In practice, these values hardly coincide with the design values due to manufacturing and assembly processes or continuous use of the robot. In order to reduce this geometric error, it is necessary to calibrate the robot to update the geometric model and reduce the resulting error of the robot end-effector. In this work, we propose a methodology based on a vision system to calibrate the robot's geometric parameters and minimize the error between the robot’s end-effector theoretical and real trajectory. This way, variations are introduced to the geometric parameters that generate errors between the robot's desired position and the position developed. The results show up a reduction of the average position error of 54.6%.
{"title":"A low-cost monocular vision system for robot calibration","authors":"Jesús Abraham Rojas Úrzulo, José-Joel González-Barbosa, Xochitl Yamile Sandoval Castro, Maximiano Francisco Ruiz Torres, Erick-Alejandro González-Barbosa","doi":"10.5377/nexo.v36i04.16752","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16752","url":null,"abstract":"The inverse kinematic model uses robot design parameters: ideal link lengths and mounting angles. In practice, these values hardly coincide with the design values due to manufacturing and assembly processes or continuous use of the robot. In order to reduce this geometric error, it is necessary to calibrate the robot to update the geometric model and reduce the resulting error of the robot end-effector. In this work, we propose a methodology based on a vision system to calibrate the robot's geometric parameters and minimize the error between the robot’s end-effector theoretical and real trajectory. This way, variations are introduced to the geometric parameters that generate errors between the robot's desired position and the position developed. The results show up a reduction of the average position error of 54.6%.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041151","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 : 2023-09-30DOI: 10.5377/nexo.v36i04.16770
Amaury Pérez Sánchez, Maria Isabel La Rosa Veliz, Zamira María Sarduy Rodríguez, Elizabeth Ranero González, Eddy Javier Pérez Sánchez
Horizontal shell and tube condensers are widely used in several industrial applications due to its versatility and heat transfer efficacy. In the present work, the thermo-hydraulic design of a horizontal shell and tube heat exchanger intended to condense 25,000 kg/h of a pure ethanol stream was carried out. Several key design parameters were calculated such as the number of tubes, heat transfer area, overall heat transfer coefficient, shell internal diameter, baffle spacing, as well as the pressure drop for both streams. The heat exchanger type is of pull-through floating head, and will present a number of tubes of 731, a heat transfer area of 223.68 m2, an overall heat transfer coefficient of 499.36 W/m2.ºC, a shell internal diameter of 1.684 m and a baffle spacing of 0.674 m. Around 157 kg/s of chilled water will be required for this heat transfer service. The values of both the shell side (10,069.25 Pa) and tube side (42,192.63 Pa) pressure drop are below the maximum values set by the process.
{"title":"Thermo-hydraulic design of a horizontal shell and tube heat exchanger for ethanol condensation","authors":"Amaury Pérez Sánchez, Maria Isabel La Rosa Veliz, Zamira María Sarduy Rodríguez, Elizabeth Ranero González, Eddy Javier Pérez Sánchez","doi":"10.5377/nexo.v36i04.16770","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16770","url":null,"abstract":"Horizontal shell and tube condensers are widely used in several industrial applications due to its versatility and heat transfer efficacy. In the present work, the thermo-hydraulic design of a horizontal shell and tube heat exchanger intended to condense 25,000 kg/h of a pure ethanol stream was carried out. Several key design parameters were calculated such as the number of tubes, heat transfer area, overall heat transfer coefficient, shell internal diameter, baffle spacing, as well as the pressure drop for both streams. The heat exchanger type is of pull-through floating head, and will present a number of tubes of 731, a heat transfer area of 223.68 m2, an overall heat transfer coefficient of 499.36 W/m2.ºC, a shell internal diameter of 1.684 m and a baffle spacing of 0.674 m. Around 157 kg/s of chilled water will be required for this heat transfer service. The values of both the shell side (10,069.25 Pa) and tube side (42,192.63 Pa) pressure drop are below the maximum values set by the process.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041268","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：