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All Journal Electron: Jurnal Ilmiah Teknik Elektro JPT : Jurnal Pendidikan Tematik
Nurmela
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Religion Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Mathematics Other

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The Application of English Conversation Pocket Book in Teaching Students' Speaking Skill ( A Descriptive Qualitative Study at MTS ja-alhaq Bengkulu City in the Academic Year 2021/2022) Nurmela; Rizal, Syamsul; Utami, Valisneria
JPT : Jurnal Pendidikan Tematik Vol 3 No 3 (2022): Desember
Publisher : Yayasan Darussalam Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62159/jpt.v3i3.646

Abstract

Speaking is the most important skill among the four language skill in order to communicate well in this globalized world, especially speaking in English. The data collected by the researcher shows that there are some problems with learning speaking skills. Some of these problems are, students lack confidences in speaking English, students have difficulty in pronouncing English correctly, students are lazy to memorize English vocabulary, and students are less interested in learning English. learn English. With the problems faced by these students, in 2020 the MTs ja-alhaq school launched a pocket book for foreign language conversations which was used as an aid medium in learning students' speaking skills. This conversation pocket book is used during the foreign language development institute program. Foreign language development institutes are programs that study foreign languages. The result from this study is the application of an English conversation pocket book in teaching speaking skills in class VIII MTs Ja-Alhaq the English conversation pocket book has a positive response because it really help the teacher and students in the process of leaning a foreign language, especially English, even though the teacher has obstacles in the learning process.
Filter Hybrid Double-Tuned dan High-Pass untuk Mitigasi Harmonisa pada Sistem HVAC Inverter Malik, Mochamad Irlan; Hamdani, Yuda Muhammad; Nurdiansyah, Rian; Faridah, Linda; Nurmela
ELECTRON Jurnal Ilmiah Teknik Elektro Vol 6 No 2: Jurnal Electron, November 2025
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/electron.v6i2.387

Abstract

Inverter-based Heating, Ventilation, and Air Conditioning (HVAC) systems are increasingly utilized in industrial settings for their superior energy efficiency and controllability. Despite these advantages, nonlinear switching in inverters generates significant harmonic distortion, particularly at lower-order frequencies such as the 3rd and 5th, which can compromise power quality, reduce system lifespan, and lead to non-compliance with regulatory standards. This study proposes a hybrid passive filter solution—combining a Double Tuned Filter (DTF) and a High Pass Filter (HPF)—to mitigate harmonic distortion in an industrial HVAC system. Field data collected using a Power Quality Analyzer (PQA) revealed a 3rd-order Individual Harmonic Distortion of Current (IHDi) of 12.9%, far exceeding the 4.0% threshold specified in IEEE 519:2022. The hybrid filter was analytically designed and validated through MATLAB/Simulink simulation. Post-simulation results demonstrated effective mitigation of Total Harmonic Distortion (THD) to 3.45%, with the 3rd-order IHDi mitigated to 3.42%, achieving full compliance with IEEE 519:2022. Furthermore, the hybrid filter preserved voltage waveform quality and suppressed high-order harmonics without incurring additional energy losses or resonance issues. The combination of DTF and HPF offers wide-spectrum harmonic mitigation and enhanced power system stability. This solution is well-suited for high-load, scalable infrastructures aligned with Industry 4.0 requirements. The study concludes that passive hybrid filters are a reliable and cost-effective strategy for harmonic suppression, and future work should explore real-time adaptive control and hybrid active-passive configurations for enhanced dynamic performance
Co-Authors Faridah, Linda Hamdani, Yuda Muhammad Malik, Mochamad Irlan Nurdiansyah, Rian Syamsul Rizal Utami, Valisneria