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This issue of the RECENT journal was edited with the support of: ContentsA Study to Determine Infrastructure Needs for Hybrid and Electric Vehicle Training in Vocational Education
RECENT J. (2023), 69:004-008 https://doi.org/10.31926/RECENT.2023.69.004 Abstract In parallel with the widespread use of hybrid and electric vehicle production in the world and reaching a significant market share, the training needs of all relevant stakeholders, especially maintenance and service operations, are increasing rapidly, in addition to the routine vocational training of these vehicles. However, it is impossible to say that the vocational education infrastructure that can meet this increasing need is sufficient due to both costs and new technology. In this study, the infrastructure needs analysis findings were made to determine the Vocational Education and Training needs of employees in the hybrid field. Electric vehicle technologies were evaluated and aimed to provide infrastructure for training programs in line with these needs, thereby strengthening the existing education infrastructure. Keywords electric vehicles, hybrid vehicles, vocational training, infrastructure needs analysis Synthesis of Copper Nanoparticles by Using Solenostemma argel Extract and Its Application as an Antimicrobial Agent
RECENT J. (2023), 69:009-019 https://doi.org/10.31926/RECENT.2023.69.009 Abstract In this study, metallic nanoparticles of copper were synthesized by the green method using an aqueous solution of Solenostemma argel extract. The extract was mixed well with cupric nitrate trihydrate. The plant extract acts as both a reducing and stabilizing agent. The prepared nanoparticles are found to be stable in the aqueous solution of the plant extract over seven months at room temperature (25 °C). The prepared copper nanoparticles were characterized by scanning electron microscopy (SEM) and UV-vis spectrum analysis. The scanning electron micrograph showed spherical nanoparticles in 30-50 nm size. These nanoparticles exhibited surface Plasmon absorption resonance (SPR) in the visible region. Also, they exhibited interesting anti-bacterial activity against Gram-positive and Gram-negative bacteria. Keywords synthesis of copper, solenostemon argel, nanoparticles Security Challenges from the Integration of AI with Blockchain
RECENT J. (2023), 69:020-028 https://doi.org/10.31926/RECENT.2023.69.020 Abstract The way things are done in the computer world has changed because of the Internet of Things (IoT). Therefore, it's so important to integrate cloud computing with IoT devices because of how much data such devices create and how much storage and processing power they need. The fact that users share a variety of cloud computing services among their devices in different ways makes security issues more crucial even so. In a world when unprotected data might endanger our welfare, privacy is even more important. Therefore, the IoT and cloud computing must constantly assure the users' worries about security and privacy. This study examined security concerns and potential IoT application tactics for cloud computing. According to the results, there are still significant security dangers and issues that need to be resolved. To reach that purpose, it is necessary to build the architecture and modify the present program. This article covers the many security issues that the IoT and cloud computing are experiencing, particularly the worries about user privacy and cybersecurity risks. Keywords Internet of Things, Blockchain, Security, Cloud Computing, Privacy A Sustainable Approach to Plastics; Bioplastics
RECENT J. (2023), 69:029-050 https://doi.org/10.31926/RECENT.2023.69.029 Abstract This article aims to analyze bioplastics at the global level and provide information about alternative bioplastics instead of traditional plastics. By examining the literature studies, the relationship of bioplastics with plastics, their environmental effects, advantages, and disadvantages are compared. Plastic wastes cause toxic effects on soils due to chemical degradation and turn into microplastics that easily enter the environment through primary and secondary sources. Accordingly, biobased and biodegradable bioplastics emerge as potential solutions. There are norms and standards with different parameters to measure biodegradability. The leading standardization organizations are ISO (International Organization for Standardization), CEN (European Committee for Standardization), and ASTM (American Society for Testing and Materials). The literature indicates high degradation rates (>90%) for bioplastics in compost, soil, and seawater environments. The studies suggest that bioplastics are more advantageous than conventional plastics because of greenhouse gas emissions. On the contrary, they strongly impact the environment by acidification of soil and eutrophication. This article discusses plastic and bioplastic properties, the environmental impacts of plastics, biodegradability and compostability standards, and life cycle analysis. Keywords bioplastic, plastic, sustainability, LCA Statistical Appreciation of Pellets Quality for Measured Characteristics
RECENT J. (2023), 69:051-059 https://doi.org/10.31926/RECENT.2023.69.051 Abstract The purpose of the work is to highlight two statistical methods for assessing the quality of the pellet batches, respectively the s method and the R method. The practical applicability of the two methods referred to the unit density of the pellets and the ash content, were determined on the basis of some standardized methodologies. The unit density of the pellets was used both to exemplify the s method and the R method, so a total of 3 individual case studies were analysed. The work can be a support for pellet producers from all over the world to show how the quality of pellets can be determined from the point of view of an individual characteristic. Also, in the context of some ambiguous definitions of quality, the paper applies statistical methods to find the most appropriate definition of pellet quality. Keywords statistical quality, pellet, briquette, s method, R method Production of Hydrogen by Water Splitting Using Synthesized Porous Pt-Pd Nanodendrites for Energy Applications
RECENT J. (2023), 69:060-072 https://doi.org/10.31926/RECENT.2023.69.060 Abstract The continual increase in world population and lifestyle standards has led to a seminal growth in global energy consumption amounting to about 90% of global energy as fossil fuels supply the transportation and industrial sectors. This led to high emission of greenhouse gases including carbon dioxide, resulting in a substantial depletion of carbon-based resources that could be otherwise used to produce valuable chemicals. In 2013, worldwide energy consumption was 17 TW and is expected to at least double by 2050. This research studied the rational design of porous binary Pt-based nanodendrites as an efficient catalytic system for electrochemical driven water splitting for energy production. Porous Pt-Pd nanodendrites were typically synthesized by the reduction of the metal precursors by L-ascorbic acid (AA) in the presence of PVP as a structure-directing agent under ultrasonication. The Platinum-Palladium (Pt-Pd) was used as a catalyst in water splitting technique for hydrogen production and compared with commercial Pt/C catalyst. Several tests were done on the samples including Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), IT, ET to measure the energy rate and the characterization at the last step. Keywords catalyst, fuel cell, porous, platinum, nanodendrites, sonication Manufacturing of IE4 Super Premium Squirrel-Cage Induction Motors at S.C. Electroprecizia Electrical Motors S.R.L. Săcele
RECENT J. (2023), 69:073-077 https://doi.org/10.31926/RECENT.2023.69.073 Abstract Reducing electricity consumption is one of the actual requirements nowadays, being triggered by both rising energy prices and climate change effects. As electrical motors are significant energy consumers, their efficiency should be increased for lower consumption. In this regard, efficiency classes such IE4 were developed. The current paper presents the actions performed by S.C. Electroprecizia Electrical Motors S.R.L. Săcele to increase the efficiency of the induction motors that they manufacture to comply with the stricter requirements in terms of efficiency. Information is provided about the technical solutions that were used and the results for two pole pairs motors with rated powers of 1.5 and 3 kW. Keywords squirrel-cage induction motors, losses decrease, super premium efficiency
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