发布求助
文献互助 智能选刊 最新文献

Nexo Revista Científica最新文献

筛选
英文 中文
Experimental study and mathematical modelling of convective thin-layer drying of noni (Morinda citrifolia L.) 诺丽(Morinda citrifolia L.)薄层对流干燥的实验研究与数学建模
Nexo Revista Científica Pub Date : 2023-02-22 DOI: 10.5377/nexo.v36i01.15791
Francisco Canelo, Kevin Gutiérrez, Apolinar Picado, R. Gamero
{"title":"Experimental study and mathematical modelling of convective thin-layer drying of noni (Morinda citrifolia L.)","authors":"Francisco Canelo, Kevin Gutiérrez, Apolinar Picado, R. Gamero","doi":"10.5377/nexo.v36i01.15791","DOIUrl":"https://doi.org/10.5377/nexo.v36i01.15791","url":null,"abstract":"In this study, the drying kinetics of noni (Morinda citrifolia L.) was investigated in a laboratory tunnel dryer at air temperatures of 50, 60, and 70 °C and velocities of 1.0, 1.5, and 2.0 m/s. Noni showed only a falling drying rate period. Further, a non-linear regression procedure was used to determine the characteristic drying curve. The experimental drying data of noni were employed to fit thin-layer models. Under the evaluated experimental conditions, the Page model provided the best representation of thin-layer drying characteristics of noni. The effective moisture diffusivity ranged from 1.77 × 10-7 to 3.33 × 10-7 m2/s. The activation energy was found to be 3.34 kJ/mol.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124371628","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
Simulation of a continuous fluidised bed dryer for paddy 稻谷连续流化床干燥机的模拟
Nexo Revista Científica Pub Date : 2023-02-22 DOI: 10.5377/nexo.v36i01.15795
Apolinar Picado, R. Gamero
{"title":"Simulation of a continuous fluidised bed dryer for paddy","authors":"Apolinar Picado, R. Gamero","doi":"10.5377/nexo.v36i01.15795","DOIUrl":"https://doi.org/10.5377/nexo.v36i01.15795","url":null,"abstract":"A model for simulating the drying of paddy (Oryza sativa L.) in a continuous fluidised bed dryer was employed. Equipment and material models were applied to describe the process. The equipment model was based on the differential equations obtained by applying mass and energy balances to each element of the dryer. In the case of the material model, mass and heat transfer rates in a single isolated particle were considered. Simulation results were verified by comparison with experimental data from the literature. There was a very good agreement between experimental data and simulation. The effects of gas temperature and velocity, particle diameter, dry solid flow, and solid temperature on the drying process were studied. It was found that the changes in gas velocity, dry solids flow, and solid temperature had essentially no effect on the drying process.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121637064","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
Electrodeposición de níquel y cobalto en placas de acero inoxidable AISI 304 usando la técnica de recubrimiento selectivo y etalina como solvente 采用选择性涂层技术和乙炔为溶剂在AISI 304不锈钢板上电沉积镍和钴
Nexo Revista Científica Pub Date : 2023-02-22 DOI: 10.5377/nexo.v36i01.15796
Nicole Baltodano-Obregon, Gregorio Vargas-Gutiérrez
{"title":"Electrodeposición de níquel y cobalto en placas de acero inoxidable AISI 304 usando la técnica de recubrimiento selectivo y etalina como solvente","authors":"Nicole Baltodano-Obregon, Gregorio Vargas-Gutiérrez","doi":"10.5377/nexo.v36i01.15796","DOIUrl":"https://doi.org/10.5377/nexo.v36i01.15796","url":null,"abstract":"El comportamiento electroquímico del cloruro de cobalto y níquel hexahidratado en etalina fue investigado mediante voltametría cíclica a 30 °C. Los resultados muestran que la reacción de reducción de ambos elementos es cuasi reversible y ocurre en un único paso de transferencia de dos electrones. La electrodeposición mediante la técnica de recubrimiento selectivo de ambos elementos en acero inoxidable AISI 304 fue realizada a -8.7 mA/cm2, 40 °C y 40 min. El recubrimiento fue caracterizado utilizando la técnica de microscopía electrónica de barrido (SEM), microscopía electrónica de transmisión (TEM) y espectroscopia de fotoelectrones emitidos por rayos X (XPS). Las imágenes de SEM y TEM muestran la presencia de un recubrimiento con espesor aproximado de 200 nm. El análisis mediante XPS confirma la presencia de níquel y cobalto en la composición superficial de la placa.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129100394","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
Experimental study of the kinetics and shrinkage of ginger in convective drying (Zingiber officinale Roscoe) 生姜对流干燥动力学及收缩的实验研究
Nexo Revista Científica Pub Date : 2023-02-22 DOI: 10.5377/nexo.v36i01.15797
Julio Rivas, Apolinar Picado, Joaquín Martínez, R. Espinosa
{"title":"Experimental study of the kinetics and shrinkage of ginger in convective drying (Zingiber officinale Roscoe)","authors":"Julio Rivas, Apolinar Picado, Joaquín Martínez, R. Espinosa","doi":"10.5377/nexo.v36i01.15797","DOIUrl":"https://doi.org/10.5377/nexo.v36i01.15797","url":null,"abstract":"In this work, the drying kinetics of ginger (Zingiber officinale Roscoe) was studied considering the shrinkage effect. The experimental data were obtained using three different temperatures (40, 60, and 80 °C). For the determination of shrinkage, two cutting orientations were employed. The volumetric and thickness shrinkage was evaluated by direct measurement. The shrinkage showed two periods during drying and had a considerable effect on the drying rate. An equation that relates the changes in the drying area as a function of the moisture content was determined. During drying, ginger showed only a falling rate period and exhibited a characteristic drying curve.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123994074","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
Culture media used in the proliferation of edible mushrooms of the PLEUROTUS genus 侧耳菇属食用菌增殖培养基的研究
Nexo Revista Científica Pub Date : 2022-12-31 DOI: 10.5377/nexo.v35i04.15525
Yolexis Roberta Cardona Soberao, Jorge Díaz Sánchez, Lianet Cardoso Paneque, Amaury Pérez Sánchez
{"title":"Culture media used in the proliferation of edible mushrooms of the PLEUROTUS genus","authors":"Yolexis Roberta Cardona Soberao, Jorge Díaz Sánchez, Lianet Cardoso Paneque, Amaury Pérez Sánchez","doi":"10.5377/nexo.v35i04.15525","DOIUrl":"https://doi.org/10.5377/nexo.v35i04.15525","url":null,"abstract":"The present work is carried out with the objective of defining the culture media referred by the literature for the proliferation of the Pleurotus genus of edible mushrooms and assessing their application in the conditions of Cuba. The diversity of this genus includes at least 30 species, among them, P. djamor, P. florida, P. pulmonaryius, P. sajor-cajou, P. citrinopileatus and P. ostreatus, for which it is necessary to investigate the properties of the media used in the cultivation of the genus. Their classifications are exposed, according to the nature of their ingredients, the growth promotion of various microorganisms and their purpose, as well as their use. The constituents and conditioning of culture media for edible mushrooms, the most frequent preparation methods used in the preservation of Pleurotus strains, and possible defects in them, caused by incorrect handling, contaminants, pests and diseases, are disclosed, as well as the consumption and marketing of mushrooms.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125082161","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
A review of short message service protocol 短消息服务协议综述
Nexo Revista Científica Pub Date : 2022-12-31 DOI: 10.5377/nexo.v35i04.15543
Sayed Javad Mousavi, Kamal Chaharsooghi, Gholam Ali Montazer
{"title":"A review of short message service protocol","authors":"Sayed Javad Mousavi, Kamal Chaharsooghi, Gholam Ali Montazer","doi":"10.5377/nexo.v35i04.15543","DOIUrl":"https://doi.org/10.5377/nexo.v35i04.15543","url":null,"abstract":"There are many ways to send and receive an electronic message, but SMS is more popular and nowadays used for one time password (OTP) as a part of authentication in many web applications, internet of things (IoT) access, password reset, mobile banking (M-banking), etc. Therefore, we must know how the protocol works and about its security. This protocol is designed to manage federatively (i.e., the mobile network is managing partially by many independent operators and it doesn’t need to have a central operator for the whole network. Also, many independent centrally managed networks can connect together to make a bigger network). We reviewed SMS protocol and its network structure, message structure, network entities, entities’ connection, and some security-related issues. Finally, this protocol is evaluated if it can provide Identification, Authentication, Integrity, Nonrepudiation, Confidentiality, and Availability.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114856618","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
Chemical composition and antimicrobial activity of essential oils from leaves and rhizomes of Curcuma zedoaria obtained via supercritical fluid extraction 超临界流体萃取莪术叶和根茎精油的化学成分及抑菌活性
Nexo Revista Científica Pub Date : 2022-12-31 DOI: 10.5377/nexo.v35i04.15553
D. B. Thin, B. B. Thinh, D. H. Hanh
{"title":"Chemical composition and antimicrobial activity of essential oils from leaves and rhizomes of Curcuma zedoaria obtained via supercritical fluid extraction","authors":"D. B. Thin, B. B. Thinh, D. H. Hanh","doi":"10.5377/nexo.v35i04.15553","DOIUrl":"https://doi.org/10.5377/nexo.v35i04.15553","url":null,"abstract":"Supercritical fluid extraction is a rapid, selective, and environmentally friendly method of particular interest in the extraction of essential oils from plants and herbs. Curcuma zedoaria is a member of the Zingiberaceae family widely cultivated in India, China, and Southeast Asia, including Vietnam. This study examined the chemical composition and antimicrobial activity of essential oils from the leaves and rhizomes of C. zedoaria from Vietnam obtained via supercritical fluid extraction. The main compounds of leaf essential oil were iso-borneol (31.2%), β-elemene (14.7%), β-caryophyllene (11.4%), 1,8-cineole (9.7%), and caryophyllene oxide (5.9%). In rhizome essential oil, 1,8-cineole (41.7%), β-elemene (13.6%), curzerenone (12.3%), camphor (10.2%), and germacrene B (5.2%) comprised the main compounds. The essential oils from C. zedoaria leaves and rhizomes displayed antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, and Candida albicans, with minimum inhibitory concentration values ranging from 100–400 µg/mL. Thus, our results support the need for further investigation of C. zedoaria essential oils as a potential source of antimicrobial agents.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122109043","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: 2
Effectiveness of gas inflow stimulation works at the final stage of field development 油田开发最后阶段注气增产工作的有效性
Nexo Revista Científica Pub Date : 2022-12-31 DOI: 10.5377/nexo.v35i04.15538
Valery A. Chejmatova, Yuriy V. Vaganov
{"title":"Effectiveness of gas inflow stimulation works at the final stage of field development","authors":"Valery A. Chejmatova, Yuriy V. Vaganov","doi":"10.5377/nexo.v35i04.15538","DOIUrl":"https://doi.org/10.5377/nexo.v35i04.15538","url":null,"abstract":"The focus of the study is the investigation of terminological foundations and the development of practical recommendations for assessing the effectiveness of hydrocarbon inflow stimulation at the final stage of field development. The authors refer to scientific works on the issues of company performance. The paper provides substantiation and improvement of methodological grounds with respect to assessing the effectiveness of gas inflow stimulation works. A classification and analysis of prominent Russian and foreign methods are provided and their issues are identified. As a result, the work refines the methodology for assessing the effectiveness of work at the drilling enterprise. The authors' comprehensive approach to assessing the effectiveness of inflow stimulation works, which allows for obtaining interrelated performance assessments, is proposed.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124540778","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
Air Transport Impact on the Development of the Tourism Industry 航空运输对旅游业发展的影响
Nexo Revista Científica Pub Date : 2022-12-31 DOI: 10.5377/nexo.v35i04.15542
Yuri Putrik, Olga Nelzina, A. Borisov, Dmitry Tsapuk, E. Tretyak
{"title":"Air Transport Impact on the Development of the Tourism Industry","authors":"Yuri Putrik, Olga Nelzina, A. Borisov, Dmitry Tsapuk, E. Tretyak","doi":"10.5377/nexo.v35i04.15542","DOIUrl":"https://doi.org/10.5377/nexo.v35i04.15542","url":null,"abstract":"The article is devoted to the assessment of the impact of air transport on the development of the tourism industry. It has been established that air carriers around the world provide a significant share of international tourist trips and are dependent on fluctuations in tourist demand. It has been determined that the understanding of the need to study the degree of interdependence between the tourism and aviation business transforms traditional approaches to the study of tourism and aviation transport. The analyzed functional links between travel companies and airlines allowed asserting the formation of a specialized system, the logistics principles of which will enable people to maximize their mobility potential in the modern globalized world. It has been proved that the development of air transport becomes a decisive factor in the development of tourism, its driving force. For effective joint activities of airlines with tourist enterprises, it is necessary to develop such ways of their interaction that will allow them to function in a coordinated manner within the framework of a single chain of providing tourist services.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128576579","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
Development of Innovative Projects in the Field of 5G Technology: Methodology and Assessment 5G技术领域创新项目的发展:方法与评估
Nexo Revista Científica Pub Date : 2022-12-31 DOI: 10.5377/nexo.v35i04.15547
T. Nikolenko, L. Semina
{"title":"Development of Innovative Projects in the Field of 5G Technology: Methodology and Assessment","authors":"T. Nikolenko, L. Semina","doi":"10.5377/nexo.v35i04.15547","DOIUrl":"https://doi.org/10.5377/nexo.v35i04.15547","url":null,"abstract":"The development and implementation of the latest technologies allow achieving competitive advantages in the global market and open up a wide range of prospects in various fields of activity. High risks and significant initial investments have predetermined the need to develop the most accurate methods for assessing the effectiveness of innovations. Traditional methods of investment assessment allow analyzing the economic component of these projects but do not consider specific risks that have a predominant impact on the successful result of financing. The study shows the need for an individual approach to assessing the effectiveness of each innovative project implementation, which should take into account its social significance in conjunction with maximizing economic benefits. Calculations that allow obtaining a single criterion for choosing the most optimal variant of the project implementation are presented. Recommendations on the organization of effective deployment of the 5G network in the Russian Federation are given in the study's conclusion.","PeriodicalId":335817,"journal":{"name":"Nexo Revista Científica","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129396222","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：481959085
Book学术官方微信