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International Journal of Research in Vocational Studies (IJRVOCAS)
Published by Yayasan Ghalih Pelopor Pendidikan
ISSN : 27770168     EISSN : 27770141     DOI : https://doi.org/10.53893/ijrvocas.v1i1
Core Subject : Economy, Science, Education, Social, Engineering,
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other
The International Journal of Research in Vocational Studies (IJRVOCAS) is a double-blind peer-reviewed journal. This journal provides full open access to its content on the principle that making research freely and independently available to the science community and the public supports a greater global exchange of knowledge and the further development of expertise in the field of vocational education and training (VET). IJRVOCAS is since the beginning independent from any non-scientific third-party funding. The establishment of the journal was supported between 2015 and 2016 with grants from the Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation). All members of IJRVOCAS work on an honorary basis. The journal is hosted by Ghalih Publishing and the publishing house of the Ghalih Academic. Scope IJRVOCAS covers all topics of VET-related research from pre-vocational education (PVE), initial vocational education and training (IVET) and career and technical education (CTE) to workforce education (WE), human resource development (HRD), professional education and training (PET) and continuing vocational education and training (CVET).
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 5 No. 3 (2025): IJRVOCAS - December" : 5 Documents clear
Design and Construction of A 3-Phase Motor Rotation Direction Control Module Based on PLC And VSD Toruan, Henry Hasian Lumban; Simanjuntak, Benrad Edwin; Suprianto; Peranginangin, Siwan Edi A.
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 3 (2025): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i3.210

Abstract

This design consists of a practical module for controlling both forward and reverse rotational direction, utilizing a combination of a Variable Speed Drive (VSD) and a Programmable Logic Controller (PLC). The VSD regulates the frequency and voltage supplied to the motor, while the PLC serves as the logic control center, receiving input from the control buttons and sending instructions to the VSD. Testing was conducted on an unloaded motor to ensure optimal system operation. Rotational direction change testing was performed on an unloaded motor with speed variations of 10 Hz, 20 Hz, and 30 Hz and ACC/DEC values of 3.0, 5.0, and 7.0 seconds. The higher the motor speed frequency, the greater the time difference between the ACC and DEC values set on the inverter for 3, 5, and 7 seconds and the actual time for each setting. The higher the ACC value, the longer the stabilization time required for the motor to achieve stability at each frequency range.
Overview of the Utilization of Palm Empty Fruit Bunch (PEFB) as Raw Material for Bioplastic Production Pakpahan, Cindy; Utarina, Leila; Cahyani, Aulia; Moulita, R.A. Nurul; Wulandari, Daya
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 3 (2025): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i3.389

Abstract

This research examines the utilization of Palm Empty Fruit Bunch (PEFB), a byproduct of the palm oil sector, as a sustainable feedstock for bioplastic manufacturing. Bioplastics, derived from natural substances like cellulose, starch, and vegetable oils, offer a sustainable substitute for traditional petroleum-based plastics, which substantially contribute to environmental degradation. This research examines the processes of cellulose extraction, delignification, and the diverse pre-treatment techniques employed to transform PEFB into bioplastics. The findings indicate that PEFB is abundant in cellulose, rendering it a viable material for bioplastic manufacturing. Moreover, the inclusion of plasticizers such glycerol and chitosan enhance mechanical qualities, including tensile strength and flexibility, while preserving biodegradability. The study also emphasizes the influence of various processing conditions and additives on the ultimate attributes of the bioplastic, such as water resistance and mechanical performance. The results indicate that bioplastics sourced from PEFB may aid in diminishing plastic waste and fostering sustainable materials in sectors like packaging. The analysis continues by underscoring the necessity for more research to enhance production techniques and evaluate the scalability of PEFB-based bioplastics in practical applications.
ESP in Business Communication: Implications for Vocational Education in Indonesia Wijayati, Titik; Safitri, Yulita Dwi
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 3 (2025): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i3.449

Abstract

This paper examines the role and implementation of English for Specific Purposes (ESP) in business communication within the context of Indonesian vocational education. As Indonesia integrates into the global economy and the ASEAN Economic Community, there is a growing demand for vocational graduates who possess industry-specific language competence alongside technical skills. The study synthesizes literature and current practices to highlight the shift from General English to Business English, which aims to equip students with practical skills for workplace interactions such as correspondence, presentations, and negotiations. However, the review identifies significant challenges hindering effective implementation, including insufficient teacher training in ESP methodologies, a lack of authentic and localized teaching materials, and varying levels of motivation and proficiency. Furthermore, misalignments between national curriculum standards and specific industry need often to constrain innovation in the classroom. The paper concludes by outlining key implications for improvement, recommending the adoption of rigorous needs analysis, specialized professional development for teachers, and stronger collaboration between vocational institutions and industry partners to develop relevant curricula and resources. These strategies are essential for ensuring that vocational education in Indonesia produces graduates who are competitive in the modern workforce.
Community Empowerment to Improve Sustainable Agricultural Productivity through Smart Farming Based on Floating Solar Power Plants in Kesongo Village, Semarang Regency Herlambang, Yusuf Dewantoro; Mujahidin, Irfan; Marliyati; Ningtias, Dieta Wahyu Asry; Ningrum, Siti Mardiyanti; Widhaninggar, Diana Fika; Bayu, Tatar; Prasetya, Valendry Naufal
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 3 (2025): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i3.451

Abstract

The global energy crisis and increasing demand for agricultural irrigation have driven the need for more efficient and environmentally friendly renewable energy sources. This study aims to design and implement an Internet of Things (IoT)-based Solar Water Pumping System (SWPS) to support smart irrigation in rural areas. The system was designed in Kesongo Village, Tuntang District, Semarang Regency, utilizing a 20 kWp floating solar power plant (PLTS) as the main energy source to operate a 2.2 kW water pump. IoT technology integration was carried out through an ESP32 microcontroller, pressure sensors, and relay modules that enable real-time monitoring and control of the pump via mobile devices. System testing was conducted with valve openings varying from 25% to 100% to evaluate the hydraulic performance and efficiency of the pump. Test results showed the highest efficiency of 46.95% at a head of 13.28 m with the valve fully open, while the lowest efficiency of 28.10% was obtained at a head of 14.88 m with a valve opening of 25%. The system proved capable of irrigating an area of 131,157.36 m² with a stable water supply. This study confirms that IoT-based PATS has great potential in optimizing water distribution, reducing fossil fuel use, and supporting sustainable agricultural resource management. Thus, this study provides an innovative alternative solution to increase agricultural productivity.
Design and Development of a Mini Steam Power Plant 12V DC With an Impulse Turbine Nurhaida; Susanti, Indah; Wardhani, Dyah Utari Yusa
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 3 (2025): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i3.472

Abstract

A Steam Power Plant is a system that converts thermal energy into electrical energy through the process of water evaporation and the utilization of a steam turbine. In this report, a mini 12V DC steam power plant is designed using an impulse turbine as the main driver of the generator. The system consists of an LPG-fired boiler that produces pressurized steam to rotate the turbine, enabling the generator rotor to generate electricity. Test results show a maximum output voltage of 12.5 V DC at a rotational speed of 991.5 RPM, with steam input power of 244 watts. Although the theoretical relationship between RPM and generated EMF is linear, the measured output voltage exhibits a non-linear trend due to the integrated voltage regulator. In the load test, the system maintained stable operation, although efficiency naturally decreased under full-load conditions due to the higher current draw. Pressure testing indicates a gradual increase up to 2 bar within 21 minutes, demonstrating stable boiler performance. The system successfully powered several 12V loads, including LED lights, a fan, a buzzer, and a USB charger. This mini steam power plant prototype validates the working principles of a small-scale steam power system and serves as an effective educational tool.

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