Global Journal of Engineering and Technology Advances最新文献

{"title":"Role of digitalization to increase resource productivity (Balkan cluster case study)","authors":"Aneta Elenkova Marichova, Dafina Georgieva Doneva","doi":"10.30574/gjeta.2023.16.2.0172","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0172","url":null,"abstract":"Purpose: In today's dynamic conditions an important determinant of economic growth and well-being in each country is increasing resource productivity, which is a prerequisite for the transition to sustainable production and consumption. The aim of the study is: 1) Analysis of resource productivity in selected nine countries in the Balkan region, 2) Assessment of the role of digitalization (and four key characteristics) as a factor for increasing the productivity of resources in the Balkan cluster. Method: The survey uses a method based on statistical analysis of Eurostat data and data collected in an open and standardized way, using a correlation coefficient. Results: The results of the empirical study should demonstrate the link between the digitization process in the Balkan cluster and increasing resource productivity. The survey was conducted among 25 working clusters in Bulgaria and all of them have active cooperation with partners from the Balkan countries. Conclusions: The study and conclusions demonstrate the significant opportunities for increasing resource productivity in the Balkan region by digitizing processes, resulting in optimizing consumption and separation of economic activity from material consumption. This process requires a new development strategy, strategic and flexible cooperation between the private and public sectors, between different companies, educational and research institutes, between companies from different countries in a region, which can be most effectively implemented in the cluster union.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123514545","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":"Synthesis of biodiesel from waste recycled oil employing animal bone ash","authors":"F. C. Ozioko, D. E. Rockson-Itiveh, Mabel Keke, Tunde Folorunsho","doi":"10.30574/gjeta.2023.16.2.0117","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0117","url":null,"abstract":"In this work, physiochemical properties of the waste used oil (WUO) were carried out for its aptness for biodiesel production. Calcined Animal Bone was used as a bio-base catalyst for the biodiesel production. The produced biodiesel was characterized and the optimum biodiesel produced was determined via statistical analysis using regression analysis. This was with a view to adding value to the waste used oil (WUO) and finding environmentally friendly alternative to fossil fuel. Waste used oil (WUO) was preheated and purified to clean oil via filtration, and the physiochemical and other parameters (cetane number, API, aniline point among others) the cleaned oil were determined using standard methods. The Calcined animal bone was characterized using FTIR, SEM, XRF, BET adsorption, and qualitative analysis. Biodiesel production was done via base catalyst trans- esterification while statistical analysis was done using Microsoft Excel 8.0. In order to ascertain the quality of the biodiesel, the physicochemical properties were determined and the qualities were compared with ASTM D6751 and EN 14214. Results showed that the refined WUO properties were in line with property of oil require for biodiesel production. The physicochemical characteristics of the WUO showed physical state of the oil to be liquid/dark brownish at 28oc, viscosity 6.58 cP at 28 0C, acid value, 0.96 (mg KOH/g oil), FFA (% oleic acid), 0.48, iodine value, 152.00 (g I2/100 g oil), peroxide value, 5.1 milli-equivalent of peroxide/kg of oil among others. The derived catalyst showed high basic strength with Calcium oxide (87.63 wt.%) 0s the dominant element in the catalyst. Optimum biodiesel yield was obtained at run 5 with 98.52 (%wt./wt.) at reaction time of 30 min, catalyst amount of 2.0 (%wt.), reaction temperature of 100 0C, and ethanol-oil molar ratio of 4:1. The produced biodiesel properties conformed to the recommended standard ASTM D6751 and EN 14214. The study concluded that WUO could serve as feedstock for biodiesel production that is environmentally friendly and the derived catalyst could be used as a bio-base in catalytic industries.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127867775","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":"High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel","authors":"Fabiano Ferreira Silva, Hermano Nascimento Junior, Roberto Rossy Chaves, Marcello Rosa Dumont","doi":"10.30574/gjeta.2023.16.2.0173","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0173","url":null,"abstract":"In this study, a methodology was successfully developed and validated to evaluate the behavior of spot welded joints of DP780, TRIP780 and DC04 steels in high cycle fatigue. Test specimens were made with three spot welds and Wohler curves were developed using the uniaxial tensile/traction load adopting the Owen R90C90 method. The spot welds showed an increase in fatigue life and a reduction in the maximum load, similar to steels. The influence of mechanical strength and material thickness tested and the types of fractures that occurred were compared. In low cycle regions, spot welds showed greater dispersion at maximum loading, between the different materials, and in higher cycle regions, this dispersion was reduced. The results obtained by adopting this method using three spot welds showed greater repeatability and less variation between the specimens of the same material. This developed method can be used with increased reliability to develop automotive bodies and spot welded components.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132480635","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":"The role of digital games for sensitive social groups to foster empathy","authors":"Chara Papoutsi","doi":"10.30574/gjeta.2023.16.2.0133","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0133","url":null,"abstract":"Almost everyone uses information and communication technology in some capacity every day across a wide range of industries. All individuals, including those with varied disabilities and health issues, should have access to ICTs. The studies summarized in this article are part of a growing body of research that shows how playing games can foster empathy in the fields of special education and healthcare.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"33 13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130580097","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":"S-coindex of some graph operations and its properties and conjugated polymers","authors":"Nagarajan Sethumadhavan, Kayalvizhi Gokulathilagan","doi":"10.30574/gjeta.2023.16.2.0151","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0151","url":null,"abstract":"The theory of chemical graphs is a field of mathematical chemistry that applies graph theory to the mathematical modeling of chemical phenomena. Topological index is a numerical descriptor of a molecule; it is found that there is strong correlation between the properties of chemical compounds and their molecular structure based on a specific topological feature of the corresponding molecular graph. The S-index of a graph is defined as the sum of five of the degree of vertices of a graph. In this paper, we introduce a new invariant of a graph which is identified as S-coindex. We study some basic mathematical properties and different types of graph operations like as Join, Cartesian Product, Composition, Tensor Product, Strong Product, Disjunction, Symmetric Difference, Corona Product of graphs.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134021807","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 new steganography technique based on genetic algorithm","authors":"Shahbaa Mohammed Abdulmaged, Nadia Mohammed Abdulmaged","doi":"10.30574/gjeta.2023.16.2.0146","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0146","url":null,"abstract":"As technology grows, it affect our daily lives becomes more penetrating. Our private information may be violated when communications media are used, to achieve information security this paper was based on a new technique of steganography using cryptography, color model and genetic algorithm. First, the secret text was encrypted with the advanced encryption standard (AES) algorithm. Second, the hiding was applied in two stages. First, the cover-image was converted in to the hue saturation intensity (HSI) color model and select one of the models, then divide it into a group of blocks and hiding the text in them by using least significant bit (LSB) method on specified bytes randomly, then using the genetic algorithm that calculates peak signal-to-noise-ratio (PSNR) for all blocks after the hiding process and thus obtain the best value for PSNR for the optimal block. Second, includes the final hiding of all blocks based on the results of the first stage of the best random distribution of bytes according to the results of the genetic algorithm. The PSNR and mean square error (MSE) measures were adopted to prove the accuracy and efficiency of the results.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133266577","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":"The influence of the incoming air velocity with the fan on the inlet side of an air-water generator on the freshwater mass","authors":"M. Mirmanto, M. Wirawan, Gagas Irhami","doi":"10.30574/gjeta.2023.16.2.0160","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0160","url":null,"abstract":"The air-water generator is a promising device to provide freshwater in the future. However, the machine still produces less freshwater; hence, a study of the effect of air velocity with a fan installed at the entrance of a simple air-water generator on the freshwater mass was conducted under environmental conditions. The air velocities varied were 4 m/s, 5 m/s, and 6 m/s. The air-water generator was made from a refrigeration machine system using R134a refrigerant as the working fluid. The compressor specification was 1 PK rotary type. The results show that the highest average freshwater mass obtained is 1241 g for 7 hours, the highest COP was 4.72, and the highest total heat transfer rate is 208.21 J/s.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"30 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132089016","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":"The dynamic duo of bioremediation: A case study on the efficacy of Penicellium spp and Bacillus spp","authors":"Ojumah Augustine Ikechukwu, Augustine Ikechukwu Ojumah, Benedict Agatovure Ohwojero, E. Atikpo","doi":"10.30574/gjeta.2023.16.2.0148","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0148","url":null,"abstract":"Anaerobic digestion (AD) is a biological process in which microorganisms break down organic matter with biogas. It is a series of chemical reactions during which organic material is decomposed through the metabolic pathways of naturally occurring microorganisms in an oxygen-depleted environment. Recently, anaerobic digestion (AD) has been recognized as one of the best options for treating food waste/cattle rumen mixtures since it results in two valuable final products, biogas and digestate that may be utilized for electricity production and as soil fertilizer, respectively. However, putting the digestate directly into the soil may bring environmental concerns because they contain certain pathogens and heavy metals which could be detrimental to plant and human health when consumed as food. The experimental study carried out in this project has shown that heavy metals contained in food waste/cattle rumen mixtures can be removed using indigenous microbes (Bacillus spp and Penicellium spp). From the results of the experiment carried out, it was deduced that bioremediation is effective in removing heavy metals from AD sludge. This finding is of special importance because this means that digestate can be freely used as manure without worrying about plants absorbing dangerous heavy metals which are more than their allowable limit from the soil. The use of indigenous microbes is cheap since they are readily available in the digestate.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127035434","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 on the tribological performance of bio-lubricant conditions- Review","authors":"A. Shalwan, Talal Alajmi, Naser Alajmi","doi":"10.30574/gjeta.2023.16.2.0125","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0125","url":null,"abstract":"The products based on fossil oils are increasing with the concerns of the environmental sectors and academics as well. In this era, there are challenges to finding alternative resources replacing fossil oil for different engineering applications. One of the fossil oil products is lubricant. Fossil lubricants have many industrial applications and involve millions of dollars each year in the development of lubricants due to their huge needs. Accordingly and to satisfy the industrial needs with the environmental considerations, alternative environmentally-friendly-Lubricants are nowadays the main aim identity by the tribologists. The main objective of this work is to investigate the usage of vegetarian oils as lubricant. For that , many bio-lubricants based on vegetable oil were studied and investigated the influence of these oils on wear and frictional characteristics of adhesive wear. Also, the results are very encouraging to candy the bio-lubricant as an alternative to synthetic oils any many industrial applications.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126775501","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":"The effects of laterite type on compressive and flexural strengths of concrete utilizing laterite-sand fine aggregate","authors":"Emmanuel Ogunleye","doi":"10.30574/gjeta.2023.16.2.0119","DOIUrl":"https://doi.org/10.30574/gjeta.2023.16.2.0119","url":null,"abstract":"This literature review examines the effects of laterite type on the compressive and flexural strengths of concrete when utilizing laterite-sand fine aggregate. The review provides a comprehensive overview of the research conducted in this area, highlighting the importance of understanding the properties of laterite and their influence on concrete performance. The main findings indicate that the type of laterite used as a fine aggregate significantly affects concrete strength. Factors such as gradation, mineralogy, moisture content, and reactivity of laterite impact the bonding with cement, workability, and overall durability of the concrete. The review emphasizes the need for standardized testing methods, optimization of mix proportions, long-term durability assessment, and considerations of sustainability factors in future research. The insights gained from the reviewed studies provide a foundation for subsequent experimental research and mathematical modeling, enabling the development of optimized mix designs and predictive models for utilizing laterite-sand fine aggregate in concrete construction.","PeriodicalId":402125,"journal":{"name":"Global Journal of Engineering and Technology Advances","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132331269","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}