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All Journal Educatif: Journal of Education Research Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Rekayasa Elektro Sriwijaya Educatif: Journal of Education Research
Sri Agustina
Universitas Sriwijaya
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Social Sciences Other

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Upaya Meningkatkan Hasil Belajar Peserta Didik Di Kelas IV Tentang Macam-Macam Gaya Menggunakan Model Problem Based Learning SDN 02 Pemulutan Sri Agustina; Nuraiani Usman; Ummu Aiman
Educatif Journal of Education Research Vol 5 No 1 (2023): January
Publisher : Kreasi Teknologi Informasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36654/educatif.v5i1.146

Abstract

Penelitian ini bertujuan untuk mengetahui penerapan model pembelajaran Problem Based Learning dalam meningkatkan hasil belajar peserta didik tentang macam-macam gaya di kelas IV SDN 02 Pemulutan Kecamatan Pemulutan Kabupaten Ogan Ilir tahun 2020/2021. Subjek penelitian adalah peserta didik kelas IV dengan jumlah peserta didik 22. Metode pengumpulan data dengan menggunakan observasi. Jenis penelitian ini adalah penelitian tindakan kelas, dengan teknik analisis data kualitatif dan kuantitatif. Teknik pengumpulan data pada penelitian ini adalah tes, observasi, dan dokumentasi. Hasil penelitian ini menunjukkan bahwa persentase klasikal keberhasilan belajar peserta didik pada siklus I sebesar 31,25 % dengan rata-rata 54,06. Sedangkan untuk presentasi keaktifan peserta didik yaitu 64,08%. Setelah dilakukan perbaikan pada siklus II, keberhasilan peserta didik meningkat menjadi 81,81% dengan rata-rata 74,32. Sedangkan keaktifan peserta didik meningkat menjadi 76,15%. Lalu perbaikan dilanjutkan dengan siklus III, keberhasilan peserta didik pada siklus III meningkat menjadi 86,36% dengan rata-rata 81,04. Sedangkan keaktifan peserta didik meningkat menjadi 81,06%. Kesimpulan dalam penelitian ini adalah penerapan model pembelajaran Problem Based Learning dapat meningkatkan hasil belajar dan keaktifan peserta didik tentang macam-macam gaya di kelas IV SDN 02 Pemulutan.
Perancangan Prototipe Pembangkit Listrik Tenaga Gelombang Sungai Menggunakan Gerak Translasi Magnet Permanen Sri Agustina; Antonius Hamdadi; Dwirina Yuniarti; Daniel Trivaldo Simatupang; Akbar Dwi Fortuna; Herlina Wahab
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 4 Nomor 2 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.3349

Abstract

Fossil energy sources are becoming increasingly expensive and will be unable to meet future energy demands. To address the scarcity of fossil fuels, many researchers are turning their attention to renewable energy sources. These sources of energy include wind, solar, geothermal, ocean waves, and others. The area around South Sumatra is rich in rivers, so this study utilizes the waves of the Musi River as the driving force for the River Wave Power Plant (PLTGS). The mechanism of this PLTGS is a permanent magnet generator designed to utilize the waves of the Musi River as the driving input of the generator. The river waves will move the float above, which has been arranged vertically with several permanent magnets, which will cut the magnetic field from the stator coil. The generator is designed to move translationally according to wave motion. The movement of the magnet also occurs from the impulse of the water wave, which causes the magnet to approach the stator coil and produce an induced electromotive force on the generator. Six generators are used, with each generator containing four Neodymium magnets and 1500 coils. The respective induced voltages are stored temporarily in the capacitors of the generator. The entire generator is connected in series. From the calculation results, the calculation results of the induced emf multiplied by the coil and the number of turns is 18.17 volts. Meanwhile, from the direct measurement results, the average voltage that can be generated is 10.9 volts. There is a voltage difference of 7.24 volts between theoretical calculations and direct measurements. This difference is caused by losses in the tool, such as friction, air gaps, and cable length. A permanent magnet generator that moves with the waves of the river can be used to make electricity, according to the results of this study
Analisa Performansi Pembangkit Listrik Skala Kecil Berdasarkan Coefficient of Performance (CoP) Sri Agustina; Rachli Agung Mufaridz; Djulil Amri; Herlina Wahab
Jurnal Rekayasa Elektro Sriwijaya Vol. 4 No. 1 (2022): Jurnal Rekayasa Elektro Sriwijaya
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jres.v4i1.80

Abstract

Kebutuhan listrik yang semakin tinggi dan andal mengakibatkan berbagai cara dilakukan untuk pemenuhannya. Salah satu cara tercepat untuk pemenuhan kebutuhan listrik adalah dengan menggunakan generator set. Pada penelitian dirancang satu sistem kelistrikan yang melibatkan motor DC sebagai arus masukan dari generator untuk menghasilkan daya listrik yang lebih besar. Tahapan penelitian yang dilakukan adalah disain, pengujian dan pengukuran untuk mendapatkan tegangan dan arus motor dan generator. Metode yang digunakan untuk performa dari sistem pembangkit adalah menggunakan pengukuran indeks Coefficient of Perfomance (CoP) dan temperatur yang dihasilkan oleh sistem. Pembebanan dilakukan dengan menambahkan beban sebesar 200 watt berupa lampu yang dinaikkan setiap kelipatan 3 menit hingga berakhir di menit ke 15 dengan total beban sebesar 1000 watt. Hasil penelitian didapatkan indeks CoP dengan beban tertera pada nameplate adalah sebesar 8,22 sedangkan indeks Cop tertinggi pada pembebanan 1000 watt sebesar 2,09. Hal ini disebabkan karena kapasitas pembebanan lebih kecil dibandingkan dengan kapasitas tertera pada name plate generator. Sedangkan temperatur akan semakin tinggi jika pembebanan terus ditambah.
Upaya Meningkatkan Hasil Belajar Peserta Didik Di Kelas IV Tentang Macam-Macam Gaya Menggunakan Model Problem Based Learning SDN 02 Pemulutan Sri Agustina; Nuraiani Usman; Ummu Aiman
Educatif Journal of Education Research Vol 5 No 1 (2023): January
Publisher : Kreasi Teknologi Informasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.87 KB) | DOI: 10.36654/educatif.v5i1.146

Abstract

Penelitian ini bertujuan untuk mengetahui penerapan model pembelajaran Problem Based Learning dalam meningkatkan hasil belajar peserta didik tentang macam-macam gaya di kelas IV SDN 02 Pemulutan Kecamatan Pemulutan Kabupaten Ogan Ilir tahun 2020/2021. Subjek penelitian adalah peserta didik kelas IV dengan jumlah peserta didik 22. Metode pengumpulan data dengan menggunakan observasi. Jenis penelitian ini adalah penelitian tindakan kelas, dengan teknik analisis data kualitatif dan kuantitatif. Teknik pengumpulan data pada penelitian ini adalah tes, observasi, dan dokumentasi. Hasil penelitian ini menunjukkan bahwa persentase klasikal keberhasilan belajar peserta didik pada siklus I sebesar 31,25 % dengan rata-rata 54,06. Sedangkan untuk presentasi keaktifan peserta didik yaitu 64,08%. Setelah dilakukan perbaikan pada siklus II, keberhasilan peserta didik meningkat menjadi 81,81% dengan rata-rata 74,32. Sedangkan keaktifan peserta didik meningkat menjadi 76,15%. Lalu perbaikan dilanjutkan dengan siklus III, keberhasilan peserta didik pada siklus III meningkat menjadi 86,36% dengan rata-rata 81,04. Sedangkan keaktifan peserta didik meningkat menjadi 81,06%. Kesimpulan dalam penelitian ini adalah penerapan model pembelajaran Problem Based Learning dapat meningkatkan hasil belajar dan keaktifan peserta didik tentang macam-macam gaya di kelas IV SDN 02 Pemulutan.
Efek Sudut Kemiringan Alur Rotor Motor Arus Searah terhadap Torsi dan Daya Luaran Herlina Wahab; Sri Agustina; Sariman; Diaz Dwi Rahma
Jurnal Rekayasa Elektro Sriwijaya Vol. 4 No. 2 (2023): Jurnal Rekayasa Elektro Sriwijaya
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jres.v4i2.88

Abstract

Penggunaan motor listrik yang semakin luas di berbagai bidang mengakibat tuntutan terhadap karakteristik motor listrik yang semakin baik dan efisien. Pada penelitian ini motor yang digunakan sebagai objek adalah motor arus searah (MAS), jenis ini diketahui lebih banyak memiliki keunggulan dibandingkan jenis lainnya. Efisiensi MAS ini diharapkan sebesar mungkin dengan indikatornya besaran daya, torsi, arus yang dihasilkan. Penelitian ini bertujuan untuk menganalisis efek dari perubahan atau penambahan kemiringan alur rotor terhadap nilai torsi dan daya yang dihasilkan. Metode yang digunakan adalah restrukturisasi model MAS dengan penambahan kemiringan alur rotor kearah kanan sejauh 25 derajat dan 45 derajat dari model referensi yang tegak lurus 90 derajat. Pengukuran dilakukan pada tegangan 2, 4, 6, 8, 10 dan 12 Volt. Selain itu penelitian ini juga menambahan PWM pada rangkaian pengukuran dan pengujiannya. Hasil yang didapatkan pengukuran kecepatan motor (RPM), semakin tinggi tegangan motor akan mengakibatkan RPM yang makin besar pula. Semakin besar sudut kemiringan alur rotor, maka kenaikan RPM juga makin besar. RPM terbesar didapatkan pada pengukuran tegangan 12 V sudut kemiringan 45 derajat dengan kecepatan motor sebesar 2925 RPM, begitu juga dengan nilai torsinya sebesar 0,019 Nm. Secara prinsip nilai torsi akan berbanding terbalik dengan kecepatan putar. Namun, dalam penelitian ini, ini terjadi sebaliknya. Ini disebabkan oleh penggunaan PWM yang berfungsi sebagai pengubah lebar pulsa tanpa mengurangi nilai torsi. Hal inilah yang menghasilkan peningkatan torsi seiring dengan kecepatan putar MAS.
Performance Analysis of Time Capacity and Coulomb Methods for SoC Estimation in VRLA Batteries Herlina; M. Rafli Leo; Sri Agustina; Wirawan Adi Pradana
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 2 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i2.8774

Abstract

The climate crisis and limited energy availability in remote areas encourage the use of VRLA battery-based off-grid solar energy systems, where accurate state-of-charge (SoC) evaluation is essential for system efficiency. At middle SoC ranges, the VRLA voltage curve's flatness makes voltage-based methods less effective. This research investigates the efficacy of two practical methods, Time Capacity and Coulomb Counting, in estimating the SoC of 12V 10Ah VRLA batteries at varying discharge rates (C20 to C1) using a system that incorporates Arduino Uno and ACS712 sensors. The experimental findings show that Time Capacity is the best strategy, with an inaccuracy of 0-12%. Due to sensor error and temperature sensitivity, Coulomb Counting's error is 30-38.4%. Heatmap imaging proved Time Capacity's stability across all C-rates, making it suitable for remote monitoring. These findings lay the groundwork for reliable and cost-effective renewable energy systems and encourage further research on hybrid algorithms and environmental optimisation.
Thermal Safety and Efficiency of a 24 Volt DC Motor Used as a Prime Mover for a Single-Phase Generator Sri Agustina; M. Aldi Ramadhan; Herlina; Wirawan Adipradana
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9537

Abstract

Brushed DC motors are often used as low-cost prime movers in small generator sets. However, users rarely evaluate thermal safety together with efficiency when the set operates under repeated electrical loads. This study investigates a 24 V, 750 W brushed DC motor mechanically coupled to a 220 V, 50 Hz single-phase synchronous generator and a lamp-based resistive load bank. Three generator load levels were tested (1000 W, 1400 W, and 2600 W). Each test ran for 10 minutes to represent a short-time duty that is practical for repeated laboratory trials and long enough to reveal a clear temperature trend while maintaining safe operation. The DC terminal voltage (V), input current (A), and motor surface temperature (°C) were recorded every 2 minutes. Input power, temperature rise, estimated loss power, output power, and apparent efficiency were then computed at the 10-minute mark. The results show a monotonic temperature rise with load: after 10 minutes, the motor surface temperature reached about 36.0°C (1000 W), 39.3°C (1400 W), and 41.5°C (2600 W), corresponding to a 9–15 K rise above ambient. The apparent efficiency remained high at 94.3–96.3%. These findings support a simple and replicable approach to discussing the thermal safety and efficiency of small motor–generator sets in laboratory practice.
Perancangan Prototipe Pembangkit Listrik Tenaga Gelombang Sungai Menggunakan Gerak Translasi Magnet Permanen Sri Agustina; Antonius Hamdadi; Dwirina Yuniarti; Daniel Trivaldo Simatupang; Akbar Dwi Fortuna; Herlina Wahab
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 4 Nomor 2 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.3349

Abstract

Fossil energy sources are becoming increasingly expensive and will be unable to meet future energy demands. To address the scarcity of fossil fuels, many researchers are turning their attention to renewable energy sources. These sources of energy include wind, solar, geothermal, ocean waves, and others. The area around South Sumatra is rich in rivers, so this study utilizes the waves of the Musi River as the driving force for the River Wave Power Plant (PLTGS). The mechanism of this PLTGS is a permanent magnet generator designed to utilize the waves of the Musi River as the driving input of the generator. The river waves will move the float above, which has been arranged vertically with several permanent magnets, which will cut the magnetic field from the stator coil. The generator is designed to move translationally according to wave motion. The movement of the magnet also occurs from the impulse of the water wave, which causes the magnet to approach the stator coil and produce an induced electromotive force on the generator. Six generators are used, with each generator containing four Neodymium magnets and 1500 coils. The respective induced voltages are stored temporarily in the capacitors of the generator. The entire generator is connected in series. From the calculation results, the calculation results of the induced emf multiplied by the coil and the number of turns is 18.17 volts. Meanwhile, from the direct measurement results, the average voltage that can be generated is 10.9 volts. There is a voltage difference of 7.24 volts between theoretical calculations and direct measurements. This difference is caused by losses in the tool, such as friction, air gaps, and cable length. A permanent magnet generator that moves with the waves of the river can be used to make electricity, according to the results of this study
Preliminary Study on Wind Turbines for Power on Floating Net Cages Herlina; Sri Agustina; Sariman; M. Akbar Pratama; M. Ichsan Azhary
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 6 Nomor 2 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v6i2.6869

Abstract

Focus of this primary study is to investigate how efficient horizontal-axis wind turbines (HAWT) and vertical-axis wind turbines (VAWT) are in preserving floating net cages. The expansion of the aquaculture sector, which is increasingly dependent on advanced technologies like monitoring and data processing systems in open waters, need a reliable energy source. The investigation was carried out by manipulating wind speed, battery charging duration, and electrical load for both types of wind turbines in simulated field circumstances. Based on the test results, HAWT outperforms VAWT in generating a greater battery voltage and achieving a more consistent charging period at the same wind speed. The smallest voltage rise in HAWT is 2.2 m/s with a 5-minute 0% charging time and the maximum is 1.2 m/s with a 15-minute 38.1% charging time. While the VAWT demonstrates better stability under specific load conditions, the HAWT can generate substantial power throughout a wide range of wind speeds. This renders HAWT more appropriate for utilization in dynamic maritime applications, such as floating net cages.
Co-Authors Akbar Dwi Fortuna Antonius Hamdadi Daniel Trivaldo Simatupang Diaz Dwi Rahma Djulil Amri Dwirina Yuniarti Herlina Herlina Wahab Herlina Wahab M. Akbar Pratama M. Aldi Ramadhan M. Ichsan Azhary M. Rafli Leo Nuraiani Usman Rachli Agung Mufaridz Sariman Ummu Aiman Wirawan Adi Pradana Wirawan Adipradana