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Vol. 24 (2023), No. 1 (69)

 

This issue of the RECENT journal was edited with the support of:

 


Contents


A Study to Determine Infrastructure Needs for Hybrid and Electric Vehicle Training in Vocational Education

  • Mehmet KARAHAN, Ridvan ARSLAN, Abdil KUŞ, Mehmet ŞEN, Cafer KAPLAN

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

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Synthesis of Copper Nanoparticles by Using Solenostemma argel Extract and Its Application as an Antimicrobial Agent

  • Mai Shamseldin Omer Amin, Hasabo Abdelbagi Mohamed Ahmed, Mehmet KARAHAN, Ali ARI, Eiman Seifeldin Hassan Elsiddg

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

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Security Challenges from the Integration of AI with Blockchain

  • Shih-Shuan WANG, Zsolt TOTH, Eugen-Silviu VRĂJITORU, Ionela-Roxana PUIU, Mircea BOȘCOIANU

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

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A Sustainable Approach to Plastics; Bioplastics

  • Şeyma Nur ERKUL, Mehmet KARAHAN, Ali ARI

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

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Statistical Appreciation of Pellets Quality for Measured Characteristics

  • Veronica DRAGUSANU (JAPALELA), Aurel LUNGULEASA, Cosmin SPIRCHEZ

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

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