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All Journal Journal of Vocational and Career Education Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Rangga Dino Alfian
Universitas Negeri Semarang, Indonesia
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Development and Implementation of AR-Card Learning Media to Improve Learning Outcomes in Motor Starter Topics Rangga Dino Alfian; Muhammad Khumaedi; Yeri Sutopo
Journal of Vocational and Career Education Vol. 9 No. 1 (2024): July 2024
Publisher : Journal of Vocational and Career Education

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Abstract

This research is motivated by challenges in the learning process of motor starter topics, including low student engagement, a lack of teaching aids, suboptimal learning media, and previously low student performance, with 70% of individuals failing to meet the minimum passing grade. This study aims to develop Android-based AR-Card learning media for motor starter topics, assess the feasibility of the media, and compare its effectiveness with other teaching methods in improving learning outcomes and motivation. The research employs the ADDIE development model and was conducted at SMK Bina Nusantara Semarang with 42 eleventh-grade individuals majoring in Motorcycle Engineering. The sample consisted of two classes, each receiving different teaching treatments. The results show that the AR-Card learning media developed is deemed feasible based on expert evaluations. The implementation of AR-Card learning media proved to be more effective than conventional methods. The study concludes that AR-Card learning media significantly enhances both learning outcomes and motivation. The novelty of this research lies in the 3D visualization of motor starter components integrated into the learning media.
Addition of Germicidal UV-C Radiation Equipment in the Sterilization Process to Extend the Shelf Life of Cow's Milk Ria Wulansarie; Rusiyanto Rusiyanto; Rangga Dino Alfian; Kiki Diyah Ayu Utami; Ladunia Rahmah; Miftakhul Izza Arinanda; Wara Dyah Pita Rengga
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol. 22 No. 1 (2024)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v22i1.6239

Abstract

Cow's milk provides essential human nutrients, including calcium, protein, and minerals. However, it is highly susceptible to bacterial contamination, which leads to rapid spoilage. Pasteurization is the most common method to process cow's milk, effectively reducing microbial levels. However, some heat-resistant bacteria can survive the pasteurization process, limiting its effectiveness in ensuring long-term milk safety. This study investigates the use of chemical engineering technology by combining pasteurization and UV-C radiation methods, either sequentially or simultaneously, to improve the effectiveness of milk sterilization. The use of combined techniques aims to leverage the strengths of both processes, achieving superior microbial reduction and extending milk shelf life. Different operating temperatures and radiation durations were tested to identify optimal processing conditions. The findings revealed that this combined approach achieved a significant bacterial reduction of 99.95%, decreasing the microbial count from an initial 1.9 × 10⁶ cfu/mL to 7.0 × 10² cfu/mL. Moreover, the shelf life of the milk was extended to five months, demonstrating the effectiveness of the hybrid method. The study also monitored the milk's acidity (pH) throughout the process, which remained within optimal conditions of 6.5 to 6.8. This indicates that the combined treatment does not compromise milk quality. Integrating pasteurization with germicidal UV-C radiation offers a promising alternative for milk sterilization, improving microbial control and significantly increasing the shelf life of cow's milk. The results suggest that this dual-method approach could be a valuable advancement in dairy processing, enhancing both safety and efficiency in the production and preservation of milk.
Co-Authors Kiki Diyah Ayu Utami Ladunia Rahmah Miftakhul Izza Arinanda Muhammad Khumaedi Ria Wulansarie Rusiyanto Rusiyanto, Rusiyanto Wara Dyah Pita Rengga Yeri Sutopo