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All Journal JURNAL NASIONAL TEKNIK ELEKTRO International Journal of Community Service Journal of Engineering and Technological Sciences
Johari, Norhasnidawani
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Optimizing STEM Learning in SDN Bringinan with Interactive PhET Technology Arifin, Rizal; Sudarno, Sudarno; Winardi, Yoyok; Desriyanti, Desriyanti; Adi Mustiko, Vijay; Johari, Norhasnidawani; Selamat, Ali
International Journal Of Community Service Vol. 4 No. 4 (2024): November 2024 (Indonesia - Thailand - Malaysia)
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijcs.v4i4.298

Abstract

This program aimed to enhance STEM education at SDN Bringinan, Jambon, Ponorogo, by integrating PhET Interactive Simulations. The program focused on two main topics: energy transfer and energy transformations. Students from grades 4, 5, and 6 were divided into groups and guided by facilitators to explore these concepts using PhET. The program began with problem identification through discussions with the school's Principal and teachers, followed by careful planning and execution over two sessions in August 2024. The first session introduced students to heat transfer, while the second focused on energy transformations. Post-session evaluations showed that students successfully understood and applied these concepts, identifying energy sources, converters, and users, and explaining the process of energy transformations. The success of the program suggests the effectiveness of interactive technology like PhET in improving students' comprehension of complex scientific concepts, highlighting a valuable approach for future educational initiatives.
Investigation of Reaction Dynamics of Methane Reforming on Nickel Clusters Using Molecular Dynamics Simulations Arifin, Rizal; Muzakki, Fikrun Najib; Winardi, Yoyok; Widaningrum, Ida; Zulkarnain, Zulkarnain; Abdurrouf, Abdurrouf; Johari, Norhasnidawani; Lee, Vannajan Sanghiran; Darminto, Darminto
Journal of Engineering and Technological Sciences Vol. 57 No. 1 (2025): Vol. 57 No. 1 (2025): February
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.1.5

Abstract

This study employed molecular dynamics simulations utilizing the ReaxFF force field to elucidate the mechanisms underlying methane decomposition and hydrogen generation on nickel clusters (Ni37, Ni55, and Ni80). The transformation of methane into valuable products, including carbon species and hydrogen molecules, is of considerable significance owing to the abundance of methane and its potential role as an atmospheric pollutant. The findings suggest that Ni37 clusters had the highest initial reactivity, although they deactivated swiftly; conversely, Ni55 and Ni80 exhibited more consistent reaction rates. The highest efficiency of hydrogen production per unit surface area was displayed by Ni55 clusters within 100,000 fs, demonstrating a balance between reactivity and stability. Methane dissociation on the Ni55 clusters occurred in multiple stages. Two distinct mechanisms for hydrogen formation were identified: simultaneous dissociation from methane and migration and the combination of hydrogen atoms on the cluster surface. Ni55 showed a substantially lower activation energy for methane dissociation at 0.5 eV than bulk nickel, suggesting a higher degree of reactivity. Conversely, the activation energy for hydrogen formation was 1.1 eV. These results highlight the potential of the Ni55 clusters as effective catalysts for hydrogen production and methane conversion
Arduino-Based Baby Bath System with Accurate Water Level and Temperature Control Prasetyo, Arya Aji; Kurniawan, Edy; Johari, Norhasnidawani; Arifin, Rizal
JURNAL NASIONAL TEKNIK ELEKTRO Vol 14, No 1: March 2025
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jnte.v14n1.1228.2025

Abstract

Infant bathing can be challenging for parents due to safety and temperature control concerns. This study aimed to develop and evaluate a fully automated baby bathtub system featuring water level and temperature control using an Arduino Mega 2560 microcontroller. This system was designed to ensure a safe and comfortable bathing environment for infants while providing convenience for parents. The methodology involved designing and assembling key components, including a 4x4 keypad, relays, water level, and temperature sensors. The system underwent comprehensive testing to evaluate its functionality and accuracy. The results showed that the system maintained a consistent water level of 9 liters and controlled water temperature within a narrow range. For example, when the actual water temperature was 37.8°C, the sensor reading was 37.5°C, demonstrating a minor deviation of 0.3°C. Overall, temperature deviations ranged from 0.5°C to 1.0°C from the setpoint. The total operation time for preparing the bathtub, including heating and filling, ranged from 15 to 20 minutes. All components functioned correctly during testing, confirming the system's reliability and accuracy. In summary, the automated baby bathtub system successfully meets its design objectives, offering a safe, efficient, and user-friendly solution for infant bathing while assuring parents of its safety and ease of use.
Co-Authors abdurrouf Abdurrouf Adi Mustiko, Vijay Ali Selamat Arifin, Rizal Darminto . Desriyanti, Desriyanti Edy Kurniawan, Edy Ida Widaningrum, Ida Lee, Vannajan Sanghiran Muzakki, Fikrun Najib Prasetyo, Arya Aji Sudarno Sudarno Winardi, Yoyok Zulkarnain, Zulkarnain