Current Journal of Applied Science and Technology最新文献

{"title":"Mechanical Properties and Engineering Applications of Flexural and Tensile Properties in Materials Science","authors":"Atere, M. Ebunoluwa, Ahmed Taiwo, H. O. Uzoeto, E. C. Ezeh, Peter C. Okorie, Cosmas Samuel, Adeleke Toheeb, Mackson Unogu Osondu","doi":"10.9734/cjast/2024/v43i84420","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i84420","url":null,"abstract":"Aim: This research project aims to comprehensively characterize the flexural and tensile properties of banana fibre and analyze their implications for engineering applications. The objective is to elucidate the relationship between material microstructure, processing parameters, and mechanical behavior, thereby providing valuable insights for materials selection, design optimization, and advanced materials development. \u0000Methods: Experimental testing was conducted to characterize the flexural and tensile properties of banana fibre using standardized procedures for flexural testing (e.g., ASTM D790) and tensile testing (e.g., ASTM D638). Specimens were prepared according to established protocols, and testing was performed using state-of-the-art equipment and protocols. The collected data were analyzed statistically to determine key mechanical parameters, including maximum stress, strain, modulus of elasticity, and energy absorption capacity. \u0000Results: The experimental results revealed comprehensive insights into the flexural and tensile properties of banana fibre. Analysis of the data identified trends, correlations, and key factors influencing mechanical behavior. Flexural properties, including flexural strength, modulus of elasticity, and toughness, were characterized under various loading conditions and geometries. Tensile properties, such as tensile strength, strain, and modulus of elasticity, were assessed to evaluate the material's ability to withstand stretching or elongation without failure. \u0000Conclusion: The findings of this research project provide valuable insights for engineering applications and materials development. The comprehensive characterization of flexural and tensile properties offers guidance for material selection, structural design, and performance optimization in various industries. Furthermore, the analysis of the relationship between material microstructure, processing parameters, and mechanical behavior contributes to advancements in materials science and engineering. Overall, this research project enhances our understanding of the mechanical behavior of materials and provides a basis for future research and innovation in the field.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"11 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141920663","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 Study on Evolution of Optical Fiber Communication from PDH to SDM Technology","authors":"P. Choudhury, Tanmay De","doi":"10.9734/cjast/2024/v43i74413","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i74413","url":null,"abstract":"In today’s world, long distance communication is a vital part of communication technology. In the field of communication, continuous research is going on for transmission of a greater number of bytes. In this article we discuss the different stages of long-distance communication via optical fiber and we go through the history of optical fiber communication and discuss the different stages of development in the optical fiber communication. This article briefly discusses the following stages of optical fiber communication: i) Plesiochronous Digital Hierarchy (PDH) ii) Synchronous Digital Hierarchy (SDH) iii) Wavelength Division Multiplexing (WDM) iv) Elastic Optical Networks (EONs) v) Space Division Multiplexing (SDM).","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"104 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141812126","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":"Study of the Performance of an Indirect Forced Convection Solar Dryer Incorporating a Thermal Energy Storage Device on a Granite Bed for Drying Tomatoes","authors":"Salifou Tera, Souleymane Sinon, Sié Kam, Haro Kayaba, Ourmar Sanogo, Benoit Stutz","doi":"10.9734/cjast/2024/v43i74411","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i74411","url":null,"abstract":"Indirect solar dryers combining a solar collector and an enclosure enable the drying process to be run smoothly, with good quality dried products. However, when the process lasts longer than one day, some of the products may be damaged when the drying process is interrupted. The integration of a thermal storage system into indirect solar dryer systems can make up for the unavailability of solar energy and enable the drying process to continue over longer periods without the need for additional energy. With this in mind, the present study investigates the performance of a forced convection indirect solar dryer coupled with a thermal energy accumulator for drying tomatoes. The experiments were carried out with a drying air flow rate of 0.01 kg/s during the drying period. The air flow rate during storage tank charging was 0.013 kg/s. Solar drying performance with and without storage was compared. The results show that to reduce the water content in the dry tomato base from 16.78 kgwater/kgms to 0.125 kgwater/kgms, the indirect solar dryer requires 15 hours of cumulative sunshine spread over two drying days, while the indirect solar dryer coupled with the heat accumulator enables the water content in the dry base to be reduced from 19.81 kgwater/kgms to 0.117 kgwater/kgms over 17 continuous hours, i.e. approximately one sunny day and one night. The overall average efficiency of the indirect solar dryer with heat storage is around 23.31%, compared with 17.47% for the indirect solar dryer.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"81 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664387","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":"Improving Learning in Robotics Teleoperation: Contribution of Eye-tracking in Digital Ethnography","authors":"Philippe Fauquet-Alekhine, Julien Bleuze","doi":"10.9734/cjast/2024/v43i74412","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i74412","url":null,"abstract":"Aims: Digital ethnography has shown its added-value for the analysis of work activity in order to improve the methods of developing the associated necessary competencies. In particular, tracing process methods based on first-person recording of the activity by first-person view camera combined with competencies-oriented and goal-oriented interviews have demonstrated their effectiveness in medicine, nuclear industry and education. However, the teleoperation of robots out of sight requires the use of a specific first-person view camera: an eye-tracking device. This is due to the fact that during the teleoperation, the pilot's head movements are almost non-existent while the eyes move enormously. Yet, the literature is completely void of this type of activity analysis using eye-tracking for teleoperation in robotics. The objective of the present article is to fill this gap by presenting a pilot study characterizing the potential contribution of first-person view tracing process combined with competencies-oriented and goal-oriented interviews for robotics teleoperation out of sight. \u0000Study Design: The pilot study has involved two robot pilots individually performing a teleoperation task out of sight. The pilots have been chosen for their difference of experience in teleoperation. Whilst performing the activity, they have been equipped with an eye-tracking device, enabling the recording of the activity at the first-person perspective. An interview based on the Square of PErceived Action model (SPEAC model) has followed in order to access what makes their competencies. \u0000Place and Duration of Study: The experiments were undertaken in the simulation training center of the Groupe INTRA-Intervention Robotique sur Accidents, in France, during 2023. \u0000Methodology: Two pilots had to individually teleoperate a robot from a control console using the videos transmitted on several screens placed in front of them from the cameras on board the robot. The activity consisted of moving the robot through a maze carrying a container in which a ring had to be put after being picked up from the ground, and then bring the whole out of the maze. The activity lasted about 10 to 20 minutes. Each pilot was equipped with an eye-tracking device that made it possible to record their activity for deferred access in order to identify the knowledge and know-how implemented. The interview was conducted using the SPEAC model. At the end of the interview, a matrix of competencies was built for each of the pilots. Software processing made it possible to access quantified data, in particular the vision fixation time for each of the pilots in order to take information from the screens and the control console. \u0000Results: The comparison of the matrices of competencies made it possible to measure the gap in competence between an experienced pilot and a novice pilot, as well as to identify knowledge and know-how not yet taught in pilot training. The measurement of fixation times has also made i","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"81 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664388","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":"Study of Regular Variations in Vertical Total Electron Content (VTEC) from 2013 to 2021 at Station BF01 in Ouagadougou","authors":"Pouraogo Ouédraogo, Karim Guibula, Abidina Diabaté, Rolland Fleury, Frédéric Ouattara","doi":"10.9734/cjast/2024/v43i74410","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i74410","url":null,"abstract":"This paper presents the regular variations of the Vertical Total Electron Content (VTEC) at station BF01 (Lat. = 12.3714 N and Long. = -1.5197 W) in Ouagadougou (Burkina Faso) located in the trough of the equatorial ionisation anomaly near the northern ridge of the West African zone. The period studied runs from 2013 to 2021. The VTEC is extracted from the raw Global Navigation Satellite System - Continuously Operating Reference Station (GNSS-CORS) data recorded at station BF01 during the study period. The analysis of diurnal variations showed three types of profiles with a dominant profile being the Dome type. Generally speaking, the daily VTEC profiles show a minimum at dawn between 4:00 UT and 6:00 UT followed by a rapid increase from sunrise to a maximum around 15:00 UT, then a gradual decrease in the late afternoon and during the night to reach the minimum just before sunrise. On some days, a second nocturnal maximum is observed between 19:00 UT and 20:00 UT. Seasonal and annual variations revealed that for each year, the highest VTEC values are observed during the equinox, although with higher values at the March equinox. It was also found that the lowest VTEC values are recorded at the summer solstice in each year. The regular variations in the VTEC at station BF01 during the study period therefore highlight three anomalies: the semi-annual anomaly, the equinoctial asymmetry and the winter anomaly. Furthermore, the VTEC at station BF01 in Ouagadougou evolves in phase with the sunspot cycle.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141678178","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":"Microwave-assisted Synthesis of Cobalt Oxide Nanoparticles with Carica papaya Leaf Extract and their Catalytic Activities","authors":"V. Sridhar, Y. Prashanthi, Tentu Nageswara Rao, T. M. Naidu","doi":"10.9734/cjast/2024/v43i74409","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i74409","url":null,"abstract":"The Physico-chemical and optical characteristics of cobalt oxide nanoparticles (CoONPs) have attracted interest in their creation over the past few years. In the current study, microwave irradiation was used to induce the production of CoONPs from papaya leaf extract. Papaya leaf extract was prepared by pulverizing and drying the plant's leaves. The extract was then heated to create an aqueous extract, which was purified and saved for analysis. Cobalt nitrate was added to the extract, and a dark brown color was obtained. CoO NPs were used as a catalyst in the reduction of MB and CR, with a mixture of MB solution and NaBH4 in DD water. The catalytic reduction of 4-NP was also tested using CoO NPs. The experimental procedures for characterizing Carica papaya leaf extract CoO NPs include UV-Vis spectra, TEM, and FTIR for analyzing nanomaterial morphology, size, and chemical composition. X-ray Diffraction (XRD) spectroscopy provides information about the crystalline structure, which is crucial for understanding nanomaterial behavior and potential applications in fields like medicine, electronics, and materials science. These methods are critical for understanding nanomaterial behavior and potential applications in various fields.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"73 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141688667","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":"Innovative Method of Devulcanizing Waste Rubber from the Automotive Industry","authors":"H. A. Deepa, Chandini N V, Himanshu Mishra, Priyanka Sahu, R. Neelesh","doi":"10.9734/cjast/2024/v43i74401","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i74401","url":null,"abstract":"Chemical devulcanization of waste rubber from the automotive industry was carried using benzoyl peroxide as devulcanizing agent and, o-xylene and toluene, as solvents. The effect of time on the process of devulcanizing was investigated. The extent of sulphur removal from the reclaimed rubber was studied by using EDAX technique. Thus, this devulcanized rubber can be blended with virgin rubber and on revulcanizing the mixture, it becomes possible to reuse waste rubber and give it a new life.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"1 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141354057","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":"Risk Factors Associated with COVID-19 and Gastrointestinal Manifestations in Older Adult Patients","authors":"Anguiano-Velazquez Tabata Gabriela, Granados-Kraulles Jorge Arturo, Santiago-Sanchez Benita, Salcedo-Vargas Mauricio, Delgadillo-Urban Yerendira Margot, Herrerias-Colin Luis Angel, Huato-Andrade Cristhian, Chilpa-Garibay Angel Victor, Garcia-Gonzalez Angelica, Hernandez-Salinas Miguel, Lopez-Ramirez Eduardo, Gutierrez-Salcido Ana Luisa, Téllez-Guzman Irene Judith, Perez-Juarez Luis Daniel, Salmeron-Hilario Exequiel, Ruiz-Martinez Airym, Lopez-Hernandez Daniel","doi":"10.9734/cjast/2024/v43i64399","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i64399","url":null,"abstract":"Aims: To establish the association of gastrointestinal symptoms and possible risk factors with COVID-19 in older adults.\u0000Study Design: An observational, cross-sectional, descriptive, retrospective study was designed using secondary sources, with a quantitative approach and non-probability convenience sampling.\u0000Place and Duration of Study: The study included a population of 312 records of individuals aged 18 and over with COVID-19. The population was divided into two groups: one consisting of individuals aged 18 to 59 and the other of individuals aged 60 and over.\u0000Methodology: Possible risk factors and gastrointestinal manifestations associated with COVID-19 in older adults were analysed using univariate and multivariate logistic regression models.\u0000Results: In older adults, the main gastrointestinal manifestation was diarrhea (OR=2.086, 95% CI 1.007-4.322, p=0.048). The risk of COVID-19 increased in older adults with type 2 diabetes (OR=2.053, 95% CI 1.149-3.671, p=0.015), hypertension (OR=2.34, 95% CI 1.191-4.596, p=0.014), and respiratory diseases (OR=8.049, 95% CI 1.913-33.868, p=0.004).\u0000Conclusion: In older adults, diarrhea is a symptom associated with COVID-19, and the primary risk factors were diabetes, hypertension, and respiratory diseases.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"104 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141362244","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":"Seeds of Change: Cultivating Prosperity in Rural China through E-Commerce","authors":"Cuiping Han, Xin Yu, Junyao Zhu","doi":"10.9734/cjast/2024/v43i64398","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i64398","url":null,"abstract":"With the implementation and development of the rural revitalization strategy, most rural areas in China have achieved significant progress. This paper takes Shi Zhu Mountain Village in Wufeng County, Yichang City, Hubei Province in China, as an example to explore how e-commerce can help rural agricultural development and the positive impact of e-commerce assisting agriculture. By analyzing the practice of e-commerce assisting agriculture in Shi Zhu Mountain Village, this paper aims to provide references for other rural areas to promote rural revitalization.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":" 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141372467","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":"Pollution-mediated Consequences of Anthropogenic Activities on the Coastal Town of Moanda, Central Kongo, Democratic Republic of Congo: Mitigation and Remediation Alternatives","authors":"Marcel K. Mubenga, Olivier N. Ndaywel, Gurvitch O. Nsiala, Grâce A. Mungangila, D. Musibono, Emmanuel M. Biey","doi":"10.9734/cjast/2024/v43i64395","DOIUrl":"https://doi.org/10.9734/cjast/2024/v43i64395","url":null,"abstract":"Aims: This study aims to evaluate anthropogenic activities and other sources due to natural factors likely to cause pollution on the coast of the city of Moanda in the Democratic Republic of Congo in order to analyze their negative impacts on the physical environment of this coastal zone with a view to proposing adequate mitigation and remediation measures.\u0000Study Design: This research consists of four parts, an introduction with literature review, a description of the materials and methods used, finally the results obtained and their discussion.\u0000Place and Duration of study: Research on the analysis of the anthropogenic activities was undertaken in the coastal zone of Muanda. This site is in the province of the Kongo-Exchange in Democratic Republic of Congo. This study covers the period going from the year 2016 to 2017.\u0000Methodology: The method of the direct observation (description, analyzes and synthesis) was used and supplemented by the technique of investigation per questionnaire. The methodological approaches deployed to collect the data on the ground and at the laboratory arise as follows: prospection of the site, information retrieval, sampling, investigation, data-gathering, identification of the nature of the anthropogenic activities in the coastal zone of Muanda,\u0000Results: These results show that the coast of Muanda is threatened by numerous anthropogenic activities and other sources of pollution including oil extraction industries (42%), waste drained by the sea current (22%), gas from Muanda flares. (15%), waste from cities bordering the Congo River (11%), illegal fishing by foreign trawlers (7%) and deballasting (3%) likely to lead or which already leads to its pollution as long as the mitigation or remediation measures would not be taken.\u0000Conclusion: The principal results obtained attest that many anthropogenic activities are carried out in the coastal zone of Muanda with the environmental risks. As a long time as measurements of attenuation or remediation would not be taken into account, the coast of Muanda will be always threatened by many likely anthropogenic activities of to lead or which already lead his pollution.","PeriodicalId":505676,"journal":{"name":"Current Journal of Applied Science and Technology","volume":"55 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141103015","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}