This issue of the RECENT journal was edited with the support of:
Sectoral Needs Analysis to Develop Training Programs for Hybrid and Electric Vehicles
RECENT J. (2023), 70:084-094
Car manufacturers worldwide are switching to hybrid and electric vehicle production models, which are cleaner and more sustainable alternatives. This rapid change situation has also significantly increased the need to maintain and repair these vehicles. Professionals in the motor vehicle maintenance and service industry must be up-to-date on the technological developments that occur with these increases and the critical safety measures on these vehicles. Within the scope of this study, a comprehensive training needs analysis was conducted to determine the vocational education and training needs of those working in the field of hybrid and electric vehicle technologies, and the findings were evaluated. In the study, 30 questions on a 5-point Likert scale were applied to the participants, which was structured under the headings of perception, knowledge, skills, and expectations about hybrid and electric vehicle education. 54 sector representatives, 650 students, and 652 vocational high school teachers and administrators participated in the surveys. Interestingly, in the needs analysis results, all three groups provided a similar response in all questions; that is, they stated the exact needs. Therefore, the training programs to be developed based on these results will meet all three priority stakeholder groups' hybrid and electric vehicle training needs.
electric vehicles, hybrid vehicles, vocational training, needs analysis
Mechanical Crank Presses with a Modified Law of Motion of the Slide. A Patent Study
RECENT J. (2023), 70:095-112
The vast majority of mechanical presses are using a crank mechanism for converting the main shaft’s uniform rotation into a guided linear reciprocating motion. In many applications, the law of motion ensured by this mechanism is less than adequate, mainly because of the significant variation of slide velocity during the load stroke and the relatively small weighting of the duration of this part of the stroke in relation to the total time of a double stroke. Over time, researchers have conceived more complex conversion mechanisms for mechanical presses, like bar mechanisms that combine crank and four-bat mechanisms in various configurations in order to determine laws of motion of the slide as close as possible to an imposed or assumed optimum. Based on examples from patents and utility models, the paper presents conversion bar mechanisms, double composed and triple composed, designed for mechanical presses in order to ensure the most favourable law of motion of the slide for various applications.
mechanical press, law of motion, transformation mechanism
Composite Materials Market Research and Export Potential Analysis: A Regio-Global Case Study
RECENT J. (2023), 70:113-121
In today's global markets, there is a growing demand for high-value composite products. Over the past decade, many countries have shifted their production processes towards these products in order to boost their competitiveness in the global economy. This study aims to examine the current state of the composite industry in Turkey, with a particular focus on Bursa, a major hub for the automotive industry. The analysis includes an assessment of global trade volumes, import-export data, and Turkey's position within this sector. In addition, the study explores current technology and market trends related to composite products. According to the data, Turkey's exports of composite materials increased by 19.48% in 2021 compared to the previous year, reaching 2.7 billion. By calculating the Grubel-Lloyd Index, the study finds that intra-industry trade in Turkey's composite materials product groups is mostly two-way, with a few exceptions. The average index value for composite materials was measured to be 0.6890.
composite materials, market analysis, high-value-added, Grubel-Lloyd index, Bursa
The Influence of the Over-Aging in 7075 Aluminium Alloy Plates on the Corrosion Behaviour
RECENT J. (2023), 70:122-127
A study for establishing the influence of the duration of the artificial aging heat treatment stage on the intergranular corrosion for 7075 aluminium alloy, T651 temper was carried out. Therefore, several tests were conducted by increasing the duration of the holding time in the Artificial Aging Heat Treatment from 10 hours to 20 hours, at every two hours. The experiments were done on 7075 aluminium alloy plate with a thickness of 30 mm. A dependence of the intergranular corrosion on the holding time of the artificial aging treatment was established, thus more than 37 minimum holding hours are needed for the 7075 aluminium alloy plates to have corrosion problems, which is very difficult to achieve in practice.
over-aging, 7075 aluminium alloy, corrosion