Nexo Revista Cientifica最新文献

{"title":"Sistemas constructivos, gestión integral de riesgo de desastres y adaptación al cambio climático – comunidad indígena Tiktik Kaanu","authors":"Juan Asdrúbal Flores-Pacheco, Sócrates Esteban Castro Jo, Julio César Araúz Urbina, Denis Alejandro Cash Hodgson, Leonzo Knight Julian","doi":"10.5377/nexo.v36i04.16749","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16749","url":null,"abstract":"La Costa Caribe de Nicaragua es una región pluricultural y plurilingüe donde conviven diversas culturas: pueblos indígenas misquito, Sumu-Mayangna y Rama, comunidades afrodescendientes kriol y garífuna y comunidades mestizas. Esto hace del Caribe una de las zonas más ricas en diversidad e identidad cultural. La aceleración de la variabilidad del cambio climático es una problemática global que afecta a todos diferenciadamente; sus efectos son evidentes en Nicaragua, principalmente en la Costa Caribe, y comenzarán a repercutir en muchos aspectos de la vida. Los pueblos originarios y comunidades étnicas de la región afrontan vulnerabilidades y riesgos particulares frente a las amenazas provocadas por el cambio climático. Las causas y consecuencias son entendidas de diversas maneras, dependiendo de la visión de naturaleza que tienen las diversas culturas, que van desde percepciones en los cambios del entorno para predecir fluctuaciones del tiempo y clima, hasta descripciones y documentación con base oral de las variaciones en los patrones climáticos. El estudio etnográfico en la comunidad Tiktik Kaanu, Municipio Bluefields, Región Autónoma de la Costa Caribe Sur, de la República de Nicaragua, tiene por objetivo describir la etnia, cultura y sistemas constructivos en condiciones de riesgo de desastres en la comunidad de Tiktik Kaanu, ubicada a 42 kilómetros al sur de Bluefields sobre la ribera del río Kukra, como parte de los apartados de investigación y extensión del subproyecto referido.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041272","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":"Sustainable Management Strategies for the Black Sea Coast Ecosystems","authors":"Tatiana Volkova, Natalia Pikalova, Nikon Klimov, Ilya Rudenko, Vladislav Goretskiy","doi":"10.5377/nexo.v36i04.16801","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16801","url":null,"abstract":"The paper addresses the geobotanical features of key areas along the Black Sea coast, focusing on the region from Novorossiysk to Kabardinka and from the Betta farm to Inal Bay (Russia). The study assesses the condition of plant populations, evaluates community disturbances caused by various factors, and examines vegetation patterns in relation to elevation. Of significant concern is the impact of both natural conditions and human activities on these coastal ecosystems. The paper underscores the need for effective management strategies to mitigate the detrimental consequences of human intervention and to safeguard the region's biodiversity. The study underscores the importance of sustainable practices and eco-friendly tourism as part of responsible management approaches to maintain the appeal and ecological integrity of the Black Sea coast. In conclusion, the paper's insights into the geobotanical aspects of the Black Sea coast offer valuable guidance for management strategies that can harmonize human activities with the protection and restoration of these vital coastal ecosystems.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041149","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":"Impact of employee efforts and expertise on customer surprise, delight and customer percent of budget spent: moderating role of shopping frequency","authors":"Heyam Abdulrahman Al Mousa","doi":"10.5377/nexo.v36i04.16791","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16791","url":null,"abstract":"Aim of present study is to pursuit with the abundant of resources provided by the firms to make customer satisfied and corresponding consequences which are in the favor of customers. Nevertheless, present study results indicated that customer satisfaction not necessarily in the outcome that are persuaded. In addition, study focused more on customer delight which explored innovative consequences and antecedents that are in the interest of the service firms. Study then proposed the conceptual framework and considered the links of employee expertise, employee effort to customer surprise which in turn leads to customer delight and percent of budget spent, shopping frequency is considered as moderating between customer surprise and customer delight. Data collection process were conducted in a grocery store. Study hypotheses and relationships were tested using SPSS (V.22). Findings of study shows all the considered variables are positively linked with each other.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041154","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":"Multi-vector development of tourism enterprises","authors":"Konstantin Levchenko, Zhanna Grigoryeva, Natalia Gubanova, Andrei Borisov, Victoria Lopatinskaya","doi":"10.5377/nexo.v36i04.16804","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16804","url":null,"abstract":"The article is devoted to the formation of approaches to the multi-vector development of tourism enterprises. The multi-vector development of tourism enterprises is one of the most complex systems that consider all key areas and types of activities, divisions, and spheres of functioning. The purpose of the work is to substantiate approaches to assessing the effectiveness of functioning and the main directions of strategic development of tourism enterprises at various levels. The authors identify organizational transformation models, risks of multi-vector development, features of the strategy, and communication of interaction with consumers of tourism services using qualitative methods of data analysis. The scenario approach to the development of enterprises within the framework of multi-vector development is a priority and can be implemented based on the introduction of innovative products by a tourism enterprise and provides for the renewal of technical and technological support, training, or recruitment of new personnel, the formation of a marketing policy for bringing tourism services to the market, informing consumers, creating or reorganizing service services. The authors establish that the proposed approaches to ensuring the multi-vector development of tourism enterprises allow for forming the basis for planning, organizing, controlling, regulating, and implementing high-quality multi-vector development of a company's activities.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041263","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":"Modeling of the system of regional indicators of the development of a circular economy","authors":"Elena Iakovleva, Elvira Volkova, Tatiana Katermina","doi":"10.5377/nexo.v36i04.16796","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16796","url":null,"abstract":"The purpose of the article is to present a methodological approach to modeling the system of regional indicators in the context of the development of the closed-cycle economy. The employed research methods rely on the provisions of economic and statistical analysis, management theory, situational and adaptive approaches in management, system analysis, simulation modeling, the theory of finance and financial markets, and the theory of taxation. The authors emphasize the importance of accounting for such factors as finance, taxation, entrepreneurial infrastructure, and education for the successful implementation of closed-loop economy strategies at the regional level. The results of modeling the system of regional indicators clarify the estimated forecast of the consequences of the adopted managerial decisions in the financial and industrial policy for the introduction of technologies.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041270","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":"Thermo-hydraulic rating of a shell and tube heat exchanger for acetone cooling using bell-delaware method","authors":"Amaury Pérez Sánchez, Alicia Maria Gómez Julián, Nadia Corpas Rodriguez, Elizabeth Ranero González, Eddy Javier Pérez Sánchez","doi":"10.5377/nexo.v36i04.16768","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16768","url":null,"abstract":"Shell and tube heat exchangers are becoming the most popular devices for the transfer of heat in industrial process applications. In the present work, the thermo-hydraulic rating of a shell and tube heat exchanger proposed to cool an acetone stream was carried out using the Bell-Delaware methodology. An overall heat transfer coefficient value of 426.70 W/m2.K, a calculated heat transfer area of 121.46 m2, and a percent excess area of 20.83% were obtained. Both the pressure drop of acetone and water had values of 1,622.36 Pa and 3,020.46 Pa, respectively. The proposed shell and tube heat exchanger can be used satisfactorily for the required application, since the percent excess area does not exceed the 25%, and the pressure drops of both fluid streams are below the limit values established by the process.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041150","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":"Uso del caos en cronogramas de llaves para un algorítmo de cifrado simétrico sin pérdida de información","authors":"Marlon David González-Ramírez, Eduardo Vega-Alvarado, Arturo Morales-Rangel","doi":"10.5377/nexo.v36i04.16750","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16750","url":null,"abstract":"Esta investigación presenta la construcción de un algoritmo de cifrado simétrico para imágenes de pixeles, a color y escala de grises sin pérdida de información y sin compresión, principalmente en formato BMP. Este algoritmo consiste en 15 rondas con intercambio de cajas (S-box), permutaciones, operaciones X-OR y llaves del tamaño de la imagen. Se utilizó la operación de mapa logístico para la generación de S-boxes y para construir un cronograma de llaves del tamaño de la imagen se utilizaron las ecuaciones de E. Lorenz, números trascendentales y la curva elíptica. Para medir la fortaleza del resultado cifrado, se utilizó la entropía de la información y la prueba de bondad obteniendo resultados favorables y muy cercanos a algoritmos similares.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041153","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 seismic performance and design of AAC building systems (autoclaved aerated concrete) with different reinforcement methods","authors":"Mohammad Beiranvandi","doi":"10.5377/nexo.v36i04.16774","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16774","url":null,"abstract":"Autoclaved lightweight concrete was produced for the first time in Sweden and after several decades, it has been widely used in most of the industrialized countries of the world, especially in the construction industry. Lightness, effect in reducing forces caused by earthquakes, ease of implementation, low thermal coefficient, fire resistance and sound insulation are among the undeniable advantages of this product. The use of this concrete is very effective in optimizing fuel and energy consumption, and its high compressive strength is considered an important feature, to the extent that it has been recognized as a desirable and suitable product in the construction industry. Obviously, with the growth of demand increasingly, using traditional methods and materials for housing production in Iran is not very effective. Compilation of criteria for the design and implementation of a gravity-bearing and lateral structural system made of AAC autoclaved aerated concrete products (including reinforced blocks and panels) The structure is made based on valid international regulations and considering Iran's seismic standards as follows. Roof and floor design using reinforced AAC roof panels and the combination of AAC roof blocks and regular concrete in place reinforced with steel reinforcements after examining the principles and foundations and modeling based on logical engineering principles and assumptions to compare the results and the outputs of the software have paid. Based on the available results, we can see the effect of the number of floors, plan and height of the floor on the behavior of the structure. According to the values in the table, the probability of the structure passing through the threshold of minor, moderate, and advanced damage is examined in different states. 1- The probability of passing a 1-story structure compared to a 2-story structure from the threshold of partial, moderate, and advanced damage has decreased by 59.7%, 94.5%, 99.3, and 99.8%, respectively. 2- The probability of passing a 2-story structure compared to a 3-story structure It reduces the threshold of partial, moderate, and advanced damage by 55.7%, 93.2%, 99.0%, and 99.7%, respectively.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135040980","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":"Factors influencing training requirements in hospitals: an integrative literature perspectives","authors":"Saad AlFlayyeh, Abdullah Abdul Rahman Al-Homeed","doi":"10.5377/nexo.v36i04.16794","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16794","url":null,"abstract":"Training is not a new phenomenon and trend, but it requires continuous efforts and developments due to the dynamic change in our society. Gaps will remain if training and development programs not developed timely. Present study is the combination of Gulf and other world studies about the training and development programs to highlight the importance of training and development programs, and why it is so necessary. Contemporary study then suggests the conceptual study framework and assumed the hypotheses. In the conceptual framework, it is basically shown that there is influence of training and development programs. Some influence internally, whereas some impacts are externally. And finally it has impact on the overall organization performance.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041145","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":"Concreto celular con espuma preformada y agregados ligeros","authors":"Hugo U. Martínez Canales, Eddisson F. Hernández, Analy Meneses Meneses","doi":"10.5377/nexo.v36i04.16753","DOIUrl":"https://doi.org/10.5377/nexo.v36i04.16753","url":null,"abstract":"El propósito de este trabajo es desarrollar mezclas de concreto celular empleando espuma preformada y agregados ligeros, para la elaboración de bloques de concreto de acuerdo con lo indicado en la Norma Técnica Obligatoria Nicaragüense. Se elaboraron seis mezclas de concreto, conteniendo cal, piedra pómez y fibra de polietileno, además de espuma fabricada a partir de una disolución presurizada de Texapon N70 con agua. Se elaboraron especímenes cúbicos y cilíndricos, los cuales fueron curados en húmedo y ensayados para conocer su resistencia a la compresión a los 28 días. Los resultados indican que la naturaleza de los agregados, así como el contenido de espuma en las mezclas influyó en sus densidades. Se observó que el porcentaje de material cementante usado es directamente proporcional a su resistencia final. Los resultados obtenidos de la resistencia a la compresión son comparables con los requerimientos mínimos indicados en la norma para bloques estructurales, además de servir como aislante térmico y acústico gracias a su alto porcentaje de vacío.","PeriodicalId":40344,"journal":{"name":"Nexo Revista Cientifica","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041143","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}