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All Journal INTEK: Jurnal Penelitian Journal of Applied Science, Engineering, Technology, and Education International Journal of Renewable Energy Development
Muhammad Iman Santoso
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Other

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Plucker Machine Design on Halal Mobile Poultry Slaughterhouse (MPSH) Prototype Satria, Dhimas; Dwinanto, Dwinanto; Pinem, Mekro Permana; Santoso, Muhammad Iman; Nazwa, Intan
INTEK: Jurnal Penelitian Vol 10 No 2 (2023): October 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i2.4468

Abstract

Mobile Poultry Slaughterhouse Halal (MPSH) is a mobile facility designed to carry out the process of slaughtering chickens in accordance with halal principles in the Islamic religion. Making a prototype of this tool aims to test the functionality of a system or product. The machine development designed in this research uses a drive (transmission) as a combination of pulley and v-belt. The reason for using a drive system as a pulley and v-belt is that it feels easier and more efficient in the work process. This research aims to analyze the calculation of pulley and v-belt sizes suitable for the plucker machine that was developed. This research uses an experimental design method, namely carrying out measurements, observations, and calculations of the technical specifications of the machine, then analyzing the data to obtain an idea of the machine's performance, which ultimately can provide an idea of the suitability of the machine. The research results obtained: (1) pulley sizes 100 mm and 175 mm in diameter, made from ST37 steel. (2) Required v-belt length = 1,253.95 mm. (3) V-belt axis distance = 426.25 mm. (4) The circumferential speed of the driving pulley vP = 10.99 m/s. (5) The circumferential force that arises Frate = 111.37 N. (6) The number of belts used is 1 belt.
A Comparative Study of Bioinformatics Skills of Pre-service Biology Teachers with and without a Bioinformatics Course Sari, Indah Juwita; El Islami, R. Ahmad Zaky; Maida, Citra; Yustika, Diana; Santoso, Muhammad Iman
Journal of Applied Science, Engineering, Technology, and Education Vol. 8 No. 1 (2026)
Publisher : PT Mattawang Mediatama Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35877/454RI.asci4399

Abstract

The rapid growth of bioinformatics has significantly influenced both the biological sciences and education, underscoring the importance of equipping future biology educators with relevant analytical and computational skills. This study aimed to compare the bioinformatics skills and biological knowledge of biology education students with and without experience in bioinformatics courses. A comparative descriptive design was employed, involving 49 students: 26 with no prior experience in bioinformatics and 23 with experience in bioinformatics. Data were collected using an instrument consisting of three opinion-based items and three cognitive test items. Qualitative data were analyzed thematically and visualized through diagrams, while cognitive performance was analyzed using descriptive statistics. The outcomes show that students who took the bioinformatics course demonstrated a broader use of tools, more reflective thinking about their own learning, and encountered more difficult problems, along with greater gain in scores on biology knowledge (70.29%) compared to students who did not take the course (63.63%). These findings support the need to include bioinformatics in the biology education program to better prepare pre-service biology teachers with the science and technology advancements in the future
Upcycling EAF graphite electrode waste into graphene-oxide–doped PEDOT:PSS for inverted perovskite solar cells Denny, Yus Rama; Fadli, Mohamad; Santoso, Muhammad Iman; Ramdani, Sulaeman Deni; Jafar, Rafa; Meilani, Meilani
International Journal of Renewable Energy Development Vol 15, No 3 (2026): May 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.62013

Abstract

Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is widely used as a hole-transport layer (HTL) in inverted perovskite solar cells (PSCs), but its acidity and moisture affinity can limit device performance. This study aimed to evaluate a circular-materials route by upcycling electric-arc-furnace (EAF) graphite-electrode waste into graphene oxide (GO) and applying GO-doped PEDOT:PSS as an HTL modifier, while identifying a practical low-temperature processing window for inverted PSCs under ambient conditions. Graphene oxide was synthesized from EAF graphite waste and dispersed in water (1 mg mL⁻¹), then blended with PEDOT:PSS at different loadings. Inverted PSCs with an ITO/GO-doped PEDOT:PSS/CH₃NH₃PbI₃₋ₓClₓ/PCBM/Ag architecture were fabricated in ambient laboratory air (25–27 °C; RH ≈ 40%) without a glovebox. The effects of GO loading and perovskite annealing temperature (70–130 °C) were evaluated using J–V measurements under AM1.5G illumination, supported by SEM and XRD analyses. Moderate GO addition was associated with improved film coverage and fewer pinholes, while XRD indicated better phase formation near 100 °C. In contrast, excessive annealing (≈130 °C) increased PbI₂ signatures and coincided with severe performance degradation. The optimum condition (600 µL GO per 1 mL PEDOT:PSS and 100 °C annealing) produced a champion power conversion efficiency of 0.80%, with VOC = 0.795 V, JSC = 3.48 mA cm⁻², and FF = 28.9%. Although the efficiency remained modest, the results demonstrated the feasibility of waste-derived GO as a functional PEDOT:PSS interfacial modifier and established a low-temperature processing window governing film integrity and degradation signatures in inverted PSCs, providing a basis for further optimization.
Co-Authors Dhimas Satria Dwinanto Dwinanto Fadli, Mohamad Indah Juwita Sari Jafar, Rafa Maida, Citra Meilani Meilani, Meilani Mekro Permana Pinem, Mekro Permana Nazwa, Intan R. Ahmad Zaky El Islami Sulaeman Deni Ramdani Yus Rama Denny, Yus Rama Yustika, Diana