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Unveiling the Damped Quantum Harmonic Oscillator Efendi, Yahya; Anumillah, Faza Atika; Nurhuda, Muhammad
Jurnal Kumparan Fisika Vol. 7 No. 3: Desember 2024
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.7.3.114-126

Abstract This article dis cusses the often-overlooked "damped" quantum harmonic oscillator, a vibrating system that loses energy over time. We bridge the classical-quantum divide, starting with the familiar equation of motion for a damped oscillator using Hooke's law. Delving into quantum mechanics, we explore how the Schrödinger equation governs its behavior. We then chart a path to understanding its energy changes and time evolution using mathematical tools like annihilation and creation operators, eigenstates, and eigenvalues. We then step through the understanding of its energy changes and time evolution using mathematical tools like annihilation and creation operators, eigenstates, and eigenvalues. Finally, we introduce the time-dependent Schrödinger equation for a damped quantum harmonic oscillator, which paves the way for stable oscillations Keywords: Damped Quantum Oscillator; Canonical Quantization; Invariant Operator; Time-Dependent Schrödinger Equation Abstrak Artikel ini membahas osilator harmonik kuantum teredam, sebuah sistem getaran yang kehilangan energi seiring waktu, yang sering kali diabaikan dalam kajian fisika. Kami menjembatani kesenjangan antara mekanika klasik dan kuantum, dimulai dengan persamaan gerak osilator teredam berdasarkan hukum Hooke. Dalam ranah mekanika kuantum, kami mengeksplorasi bagaimana persamaan Schrödinger mengatur perilaku sistem ini. Selanjutnya, kami menelusuri perubahan energi dan evolusi waktu osilator ini menggunakan alat matematika seperti operator annihilasi dan kreasi, eigenstate, dan eigenvalue. Terakhir, kami memperkenalkan persamaan Schrödinger bergantung waktu untuk osilator harmonik kuantum teredam, yang membuka wawasan terhadap osilasi stabil dalam sistem ini. Kata kunci: Osilator Kuantum Teredam; Kuantisasi Kanonik; Operator Invarian; Persamaan Schrödinger Bergantung Waktu

Identifikasi Limbah Cair Kelapa Sawit di Desa Tinting Boyok Kabupaten Sekadau Provinsi Kalimantan Barat Berdasarkan Nilai Resistivitas Zulfian, Zulfian; Susanto, Yuris
Jurnal Kumparan Fisika Vol. 8 No. 1: April 2025 : IN PRESS
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.1.1-10

ABSTRAK Limbah cair kelapa sawit telah diterapkan di lahan aplikasi yang berada di Desa Tinting Boyok, Kabupaten Sekadau, Provinsi Kalimantan Barat. Tujuan penelitian ini adalah untuk mengidentifikasi limbah cair kelapa sawit yang merembes ke dalam tanah. Rembesan limbah ini dikhawatirkan menurunkan kualitas air tanah. Metode yang digunakan untuk mencapai tujuan tersebut adalah metode geolistrik resistivitas dengan konfigurasi Wenner-Schlumberger. Penelitian ini menggunakan dua lintasan geolistrik dengan panjang lintasan sebesar 195 m. Identifikasi limbah cair kelapa sawit dilakukan berdasarkan nilai resistivitas yang diperoleh dari proses pemodelan menggunakan metode inversi Gauss-Newton. Dari proses inversi tersebut, penampang resistivitas yang diperoleh dapat menyatakan nilai resistivitas sebenarnya. Nilai resistivitas yang diperoleh dari hasil inversi adalah 4,53 Ωm s.d. 950 Ωm. Dari nilai resistivitas tersebut, lapisan tanah yang terdapat pada daerah penelitian berupa lapisan pasir, pasir lempungan dan lapukan granodiorit. Lapisan pasir diduga sebagai tempat akumulasi limbah cair kelapa sawit di dalam tanah. Limbah cair kelapa sawit diduga memiliki nilai resistivitas 4,53 Ωm s.d. 9,7 Ωm. Limbah cair kelapa sawit memiliki nilai resistivitas yang lebih kecil karena mengandung Chemical Oxigen Demand (COD) dan Biochemical Oxygen Demand (BOD) tinggi serta logam hingga logam berat. Rembesan limbah ini diduga terdeteksi dari kedalaman 2 m s.d. 6,5 m pada lintasan 1 dan 2 m s.d. 24 m. Formasi geologi dan topografi mempengaruhi rembesan limbah pada lintasan 1 dan lintasan 2. Kata kunci— metode geolistrik, limbah cair kelapa sawit, resistivitas ABSTRACT Palm oil mill effluent (POME) has been applied to the application site located in Tinting Boyok Village, Sekadau Regency, West Kalimantan Province. The objective of this research is to identify the seepage of palm oil mill effluent into the soil. This seepage is concerning as it may degrade the quality of groundwater. The method used to achieve this objective is the resistivity geoelectric method with the Wenner-Schlumberger configuration. This study utilized two geoelectric lines, each with a length of 195 meters. The identification of palm oil mill effluent was based on resistivity values obtained from the modeling process using the Gauss-Newton inversion method. From this inversion process, the resistivity cross-section obtained can represent the actual resistivity values. The resistivity values obtained from the inversion results range from 4.53 Ωm to 950 Ωm. Based on these resistivity values, the soil layers in the study area consist of sand, clayey sand, and weathered granodiorite layers. The sand layer is suspected to be the accumulation zone for palm oil mill effluent within the soil. The palm oil mill effluent is estimated to have resistivity values ranging from 4.53 Ωm to 9.7 Ωm. The effluent exhibits lower resistivity values due to its high Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) content, as well as the presence of metals and heavy metals. The seepage of this effluent is suspected to be detected at depths ranging from 2 meters to 6.5 meters on line 1, and from 2 meters to 24 meters on line 2. Geological formations and topography influence the seepage of the effluent on both line 1 and line 2.. Keywords— geoelectrical method, palm oil mill efflunet, resistivity

Pengaruh Penerapan Pembelajaran Science, Technology, Engineering and Mathematics terhadap Hasil Belajar Peserta Didik Kelas XI SMA Negeri 1 Tigo Nagari Hayati, Wilda; Husna, Husna; Anaperta, Megasyani
Jurnal Kumparan Fisika Vol. 8 No. 1: April 2025 : IN PRESS
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.1.11-20

ABSTRAK Penelitian ini dilatarbelakangi oleh proses belajar mengajar fisika peserta didik di SMA Negeri 1 Tigo Nagari belum optimal dan keaktifan peserta didik masih kurang, sehingga nilai peserta didik belum mencapai Kriteria Ketuntasan Minimal (KKM). Oleh karena itu, diperlukan sebuah pembelajaran yang menarik minat belajar peserta didik sehingga bisa terbentuknya suasana belajar yang baik. Adapun salah satu pembelajaran yang diterapkan adalah Pembelajaran Science, Technology, Engineering and Mathematics (STEM). Tujuan penelitian ini adalah untuk melihat pengaruh penerapan pembelajaran Science, Technology, Engineering and Mathematics terhadap berpikir kritis peserta didik kelas XI SMA Negeri 1 Tigo Nagari. Jenis penelitian yang digunakan adalah Quasi Eksperiment Design dengan desain penelitian Posstest only control group design. Pengambilan sampel dilakukan dengan teknik cluster random sampling dimana sampel diambil secara acak berdasarkan kelompok/wilayah tertentu. Hasil belajar diambil dari Instrumen pada penelitian adalah tes akhir berbentuk essay untuk ranah kognitif dan lembar aktivitas peserta didik selama pembelajaran disetiap pertemuan untuk ranah afektif. Hasil penelitian yang diperoleh adalah hasil belajar ranah kognitif kelas eksperimen rata-rata 77,41, sedangkan kelas kontrol 68,62. Hasil penilaian pada ranah afektif kelas eksperimen rata-rata 80 sedangkan kelas kontrol ranah afektifnya 77. Selanjutnya dilakukan uji hipotesis menggunakan uji Mann Whitney didapatkan hipotesis diterima. Sehingga dapat disimpulkan terdapat pengaruh penerapan pembelajaran Science, Technology, Engineering and Mathematics terhadap hasil belajar peserta didik kelas XI SMA Negeri 1 Tigo Nagari. Kata Kunci: Pembelajaran stem; hasil belajar ; uji Mann Whitney ABSTRACT This research was motivated by the physics teaching and learning process of students at SMA Negeri 1 Tigo Nagari which was not yet optimal and students' activeness was still lacking, so that students' grades had not yet reached the Minimum Completeness Criteria (KKM). Therefore, learning is needed that attracts students' interest in learning so that a good learning atmosphere can be formed. One of the lessons implemented is Science, Technology, Engineering and Mathematics (STEM) learning. The aim of this research is to see the effect of implementing Science, Technology, Engineering and Mathematics learning on the critical thinking of class XI students at SMA Negeri 1 Tigo Nagari. The type of research used is Quasi Experimental Design with a Posttest only control group design research design. Sampling was carried out using a cluster random sampling technique where samples were taken randomly based on certain groups/regions. The learning outcomes taken from the research instrument are a final test in the form of an essay for the cognitive domain and student activity sheets during learning at each meeting for the affective domain. The research results obtained were that the experimental class' cognitive domain learning results averaged 77.41, while the control class's average was 68.62. The assessment results in the affective domain of the experimental class averaged 80 while the affective domain of the control class was 77. Next, a hypothesis test was carried out using the Mann Whitney test, it was found that the hypothesis H_1 was accepted. So it can be concluded that there is an influence of the application of Science, Technology, Engineering and Mathematics learning on the learning outcomes of class XI students at SMA Negeri 1 Tigo Nagari. Keywords: Stem learning; learning outcomes ; Mann Whitney test

PENGEMBANGAN INSTRUMEN TES BERPIKIR KRITIS PADA MATERI BUMI DAN TATASURYA Putra, Niki Dian Permana; Harahap, Aulia Ilal Hamdi
Jurnal Kumparan Fisika Vol. 8 No. 2: Agustus 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.2.41-50

ABSTRAK Penelitian ini dilaksanakan di MTsN 1 Andalan Pekanbaru dengan 25 siswa di kelas VIII. Penelitian ini bertujuan untuk menghasilkan instrumen tes berpikir kritis yang valid dan reliabel, untuk mengetahui daya beda, tingkat kesukaran serta keberfungsian pengecoh (distraktor) dari instrumen tes berpikir kritis yang dihasilkan. Penelitian ini menghasilkan instrumen tes berpikir kritis pada materi bumi dan tata surya yang terdiri dari 20 soal (10 pilihan ganda, 10 esay). Penelitian ini merupakan penelitian jenis R&D (research and development) dengan menggunakan model ADDIE (analysis, design, develop, implementation, evaluation). Teknik pengumpulan data yang digunakan yaitu wawancara yang dilakukan terhadap narasumber yaitu salah satu guru IPA di lokasi penelitian. Teknik analisis dalam penelitian ini menggunakan analisis kualitatif dan kuantitatif, analisis kualitatif digunakan untuk uji validitas empiris dan analisis kuantitatif digunakan untuk uji validitas butir soal, reliabilitas, daya beda, tingkat kesukaran dan distraktor. Berdasarkan hasil penelitian yang telah dilakukan untuk uji validitas yang telah dilakukan oleh 5 validator yang terdiri dari 3 dosen dan 2 guru IPA, baik validitas empiris maupun validitas butir soal sudah memenuhi kriteria valid. Adapun hasil uji reliabilitas yang telah dilakukan diketahui bahwa instrumen tes sudah memenuhi kriteria reliabel. Berdasarkan hasil analisis tersebut dapat disimpulkan bahwa instrumen tes berpikir kritis yang telah dihasilkan oleh peneliti layak untuk digunakan dalam proses evaluasi pembelajaran di sekolah. Kata kunci: Instrumen tes, Berpikir kritis, Bumi dan tata surya ABSTRACT This research was carried out at MTsN 1 Andalan Pekanbaru with 25 students in class VIII. This research aims to produce a critical thinking test instrument that is valid and reliable, to determine the different power, level of difficulty and the function of distractors from the critical thinking test instrument produced. This research produced a critical thinking test instrument on earth and solar system material consisting of 20 questions (10 multiple choice, 10 essays). This research is an R&D (research and development) type research using the ADDIE (analysis, design, develop, implementation, evaluation) model. The data collection technique used was interviews conducted with the resource person, namely one of the science teachers at the research location. The analysis technique in this research uses qualitative and quantitative analysis, qualitative analysis is used to test empirical validity and quantitative analysis is used to test the validity of question items, reliability, differentiability, level of difficulty and distractors. Based on the results of research that has been carried out to test validity which has been carried out by 5 validators consisting of 3 lecturers and 2 science teachers, both empirical validity and the validity of the question items have met the valid criteria. As for the results of the reliability tests that have been carried out, it is known that the test instruments have met the reliability criteria. Based on the results of this analysis, it can be concluded that the critical thinking test instrument that has been produced by researchers is suitable for use in the learning evaluation process in schools. Keywords: Test instruments, Critical thinking, Earth and solar system

Pendekatan Numerik Terhadap Dinamika Transpor Ion Ca²⁺ dan K⁺ dalam Sistem Saraf Akson Berbasis Model Morris-Lecar dengan Metode ODE45 Ahda, Netriani Veminsyah; Utama, Tiara Hardyanti
Jurnal Kumparan Fisika Vol. 8 No. 2: Agustus 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.2.33-40

ABSTRAK Pemodelan transpor ion dalam sistem saraf sangat penting untuk memahami mekanisme potensial aksi dan dinamika membran sel. Penelitian ini menyajikan simulasi dinamika potensial membran akson berdasarkan model Morris-Lecar, yang merepresentasikan aktivitas neuron dengan memasukkan kontribusi utama dari ion K⁺ (Kalium) dan Ca²⁺ (Kalsium). Simulasi dilakukan menggunakan metode numerik ODE45 pada platform Matlab. Model ini mencakup dua variabel utama: potensial membran dan variabel saluran ion (K⁺ dan Ca²⁺), yang diturunkan dari sistem persamaan diferensial. Hasil simulasi menunjukkan bahwa model Morris-Lecar secara efektif merepresentasikan osilasi dan ambang eksitabilitas neuron dalam menanggapi stimulus arus. Pengaruh dominan ion Ca²⁺ terhadap proses depolarisasi serta peran ion K⁺ dalam repolarisasi juga ditunjukkan secara kuantitatif. Dengan pendekatan ini, metode ODE45 terbukti stabil dan efisien dalam menangani dinamika neuron yang kompleks. Studi ini memberikan dasar yang kuat untuk analisis lebih lanjut dalam neurofisiologi komputasional dan pemodelan biologi seluler. Kata kunci : Transpor Ion, Model Morris-Lecar, Metode ODE45. ABSTRACT Modeling ion transport in the nervous system is essential to understanding the mechanisms of action potentials and cell membrane dynamics. This study presents simulations of axon membrane potential dynamics based on the Morris-Lecar model, which uses K⁺ (potassium) and Ca²⁺ (calcium) ions to represent neuronal activity. The simulations were performed using the ODE45 numerical method on the MATLAB platform. The model comprises two primary variables: the membrane potential and the ion channel variables (K⁺ and Ca²⁺), which are derived from a system of differential equations. The simulation results demonstrate that the Morris-Lecar model accurately represents neuronal oscillation and excitability thresholds in response to a current stimulus. The simulations also quantitatively demonstrated the dominant influence of Ca²⁺ ions on depolarization and the role of K⁺ ions in repolarization. This approach proved the ODE45 method to be stable and efficient in handling complex neuronal dynamics. This study provides a solid foundation for further computational neurophysiology and cellular biology modeling analysis. Keyword: Ion transport, Morris-Lecar model, ODE45 method.

PENGARUH PENGGUNAAN PHET SIMULASI TERHADAP PENINGKATAN HASIL BELAJAR FISIKA: UPAYA MENJAWAB TANTANGAN TRANSFORMASI PEMBELAJARAN FISIKA ERA SOCIETY 5.0 Saputra, I Gede Purwana Edi; Nigsih, Surya; Triani, Triani; Bulaka, Bardan; Sari, Rina Sardiana
Jurnal Kumparan Fisika Vol. 8 No. 3: Desember 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.3.117-130

ABSTRAK Pembelajaran fisika seringkali dihadapkan pada berbagai tantangan, yakni konsep yang abstrak, metode pengajaran yang kurang interaktif dan tidak berorientasi student centered, serta keterbatasan fasilitas laboratorium yang berdampak pada rendahnya hasil belajar dan kurangnya pengembangan keterampilan abad 21 yang krusial di era Society 5.0. Menjawab permasalahan ini, penelitian ini bertujuan untuk menganalsis pengaruh penggunaan simulasi PhET terhadap peningkatan hasil belajar fisika siswa kelas X SMA Negeri 1 Watubangga. Metode penelitian menggunakan desain kuasi-eksperimental dengan pendekatan Nonequivalent Control Group Designs. Sampel penelitian terdiri dari dua kelas yang dipilih secara cluster random sampling, satu sebagai kelompok eksperimen yang menerima pembelajaran fisika menggunakan simulasi PhET, dan satu sebagai kelompok kontrol yang menerima pembelajaran konvensional. Instrumen tes hasil belajar fisika divalidasi secara komprehensif, termasuk validitas isi menggunakan koefisien Aiken's V dan validitas empiris menggunakan model Rasch, serta reliabilitas diukur dengan Cronbach's Alpha. Analisis data menggunakan deskriptif statistic dan analisis inferensial dengan uji-t independen pada skor N-Gain. Hasil penelitian menunjukkan peningkatan hasil belajar fisika yang signifikan pada kelompok eksperimen dibandingkan dengan kelompok kontrol, yakni hasil deskriptif statistik rerata skor N-Gain kelompok eksperimen 0.38 (kategori sedang) dan uji inferensial diperoleh nilai p < 0.001 dari uji-t independen. Temuan ini menyimpulkan bahwa simulasi PhET merupakan alat yang efektif dalam meningkatkan pemahaman konsep siswa yang berdampak pada peningkatan hasil belajar fisika, sekaligus menjadi strategi inovatif untuk menjawab tantangan transformasi pembelajaran fisika di era Society 5.0, yakni mempersiapkan siswa dengan keterampilan abad ke-21 yang relevan. Kata kunci : PhET Simulasi, Hasil Belajar Fisika, Transformasi Pembelajaran, Society 5.0 ABSTRACT Physics learning faces various challenges, including abstract concepts, teaching methods that are insufficiently interactive and not student-centered, and limited laboratory facilities. These issues contribute to low learning outcomes and insufficient development of 21st-century skills that are crucial in the Society 5.0 era. To address these problems, this study aims to analyze the effect of using PhET simulations on improving the physics learning outcomes of 10th-grade students at SMA Negeri 1 Watubangga. This research is quasi-experimental with Nonequivalent Control Group Design approach. The sample consisted of two classes selected through cluster random sampling: one as the experimental group, which received physics instruction using PhET simulations, and one as the control group, which received conventional instruction. The learning outcome test instrument underwent comprehensive validation, including content validity using Aiken’s V and empirical validity through the Rasch model. Reliability was assessed using Cronbach’s Alpha. Data were analyzed using descriptive statistics and inferential statistics with an independent t-test on normalized gain (N-Gain) scores. The results revealed a statistically significant improvement in the learning outcomes of the experimental group compared to the control group, with an average N-Gain score of 0.38 (categorized as moderate). The inferential analysis yielded a p-value < 0.001 in the independent t-test. These findings suggest that PhET simulations are effective tools for enhancing students’ conceptual understanding that positively impacting physics learning outcomes. Moreover, PhET simulations offer an innovative instructional strategy for transforming physics education in the Society 5.0 era, particularly in preparing students with relevant 21st-century competencies. Keywords: PhET Simulations, Physics Learning Outcomes, Instructional Transformation, Society 5.0

PENERAPAN MODEL PROBLEM BASED LEARNING DENGAN PENDEKATAN FLIPPED CLASSROOM TERHADAP PENINGKATAN KEMAMPUAN PEMECAHAN MASALAH DAN SELF EFFICACY SISWA Yaya, Ghia Syifa Maharani; Saepuzaman, Duden; Aviyanti, Lina
Jurnal Kumparan Fisika Vol. 8 No. 3: Desember 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.3.77-86

ABSTRAK Rendahnya kemampuan siswa dalam memecahkan masalah dan tingkat kepercayaan diri (self-efficacy) dalam pembelajaran fisika disebabkan oleh kurangnya keterlibatan aktif siswa dan ketidaksesuaian metode pembelajaran. Oleh karena itu, diperlukan pembelajaran yang efektif untuk meningkatkan kemampuan pemecahan masalah (KPM) dan self-efficacy. Penelitian ini menggunakan desain one group pretest posttest untuk mengeksplorasi penerapan model Problem Based Learning (PBL) dengan pendekatan flipped classroom dalam meningkatkan KPM dan self-efficacy siswa. Sampel penelitian terdiri dari 34 siswa kelas XI SMA di Kota Bandung yang diambil menggunakan teknik purposive sampling. Data dikumpulkan melalui tes kemampuan pemecahan masalah dalam bentuk esai yang terdiri dari 6 soal dan angket untuk mengukur self-efficacy yang di adaptasi dari physics learning Self Efficacy yang terdiri atas 30 pernyataan. Hasil analisis menunjukkan adanya peningkatan signifikan dalam kemampuan pemecahan masalah dan self-efficacy siswa setelah penerapan model tersebut, dengan nilai signifikansi 0,001 yang lebih kecil dari taraf signifikansi 0,05 berdasarkan uji paired sample t-test. Selain itu, analisis N-Gain menunjukkan rata-rata peningkatan kemampuan pemecahan masalah sebesar 0,77, yang termasuk dalam kategori tinggi, dan rata-rata N-Gain self-efficacy sebesar 0,56, yang berada dalam kategori sedang. Temuan ini menunjukkan bahwa penerapan model Problem Based Learning dengan pendekatan flipped classroom efektif dalam meningkatkan kemampuan pemecahan masalah dan self-efficacy siswa, sehingga dapat dijadikan acuan untuk inovasi dalam pembelajaran yang mendukung pengembangan keterampilan abad ke-21. Kata kunci : Problem based Learning, flipped classroom, kemampuan pemecahan masalah siswa, self efficacy ABSTRACT Students' low problem-solving skills and self-efficacy in physics learning are caused by a lack of active student involvement and inappropriate learning methods. Therefore, effective learning is needed to improve problem-solving skills and self-efficacy. This study uses a one-group pretest-posttest design to explore the application of the Problem-Based Learning (PBL) model with a flipped classroom approach in improving students' problem solving skilland self-efficacy. The research sample consists of 34 eleventh-grade high school students in Bandung City, selected using purposive sampling. Data were collected through a problem-solving ability test in the form of an essay consisting of 6 questions and a questionnaire to measure self-efficacy, adapted from the Physics Learning Self-Efficacy scale, which consists of 30 statements. The analysis results showed a significant increase in students' problem-solving ability and self-efficacy after the implementation of the model, with a significance value of 0.001, which is smaller than the significance level of 0.05 based on the paired sample t-test. Additionally, N-Gain analysis showed an average increase in problem-solving ability of 0.77, which falls into the high category, and an average N-Gain self-efficacy of 0.56, which falls into the moderate category. These findings indicate that the implementation of the Problem-Based Learning model with a flipped classroom approach is effective in enhancing students' problem-solving skills and self-efficacy, thereby serving as a reference for innovative learning approaches that support the development of 21st-century skills. Keywords : Problem based Learning, flipped classroom, problem solving skills, self efficacy

EVALUASI KINERJA BERBAGAI JENIS SENSOR LDR SEBAGAI LUXMETER MELALUI KALIBRASI REGRESI EKSPONENSIAL DAN POWER Heriansyah, Heriansyah; Gultom, Fades Br
Jurnal Kumparan Fisika Vol. 8 No. 3: Desember 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.3.87-94

This study aims to evaluate the performance of various types of Light Dependent Resistor (LDR) sensors as alternative luxmeters based on Arduino using exponential and power regression calibration methods. Four LDR types—GL5506, GL5528, GL5537, and GL5539—were tested under controlled lighting conditions using a dimmable smart bulb with light intensity variations from 5% to 100%. A commercial GM1030C luxmeter was used as the calibration reference. The measured data were analyzed using statistical parameters, including the coefficient of determination (R²), root mean square error (RMSE), mean absolute error (MAE), and mean percentage error, to determine the accuracy and stability of each sensor. The results show that all sensor types achieved R² values ranging from 0.9772 to 0.9992, indicating that both regression models effectively represent the nonlinear relationship between sensor output and actual light intensity. The GL5506 sensor exhibited the best accuracy with R² = 0.9962, RMSE = 13.13 lux, MAE = 11.1 lux, and an average error of 2.89% using the power regression model. The power regression model performed better for sensors with fast and linear responses (GL5506 and GL5528), while the exponential regression model was more suitable for sensors with gradual nonlinear responses (GL5537 and GL5539). With overall errors below 7%, all LDR sensors tested are suitable for use as economical and reliable Arduino-based luxmeters for educational and basic research applications.

ANALISIS HUJAN LEBAT DI CILACAP MENGGUNAKAN MODEL ECMWF, CITRA SATELIT, DAN DATA OBSERVASI Maheswara, I Dewa Gede Loka; Rizqi, Muhammad Nur; Nurwibowo, Muhammad Fany; Zakir, Achmad; Mulya, Aditya
Jurnal Kumparan Fisika Vol. 8 No. 3: Desember 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.3.95-104

ABSTRAK Kejadian hujan sangat lebat di Kabupaten Cilacap pada 8–9 Oktober 2022 yang memicu banjir pada 9 Oktober 2022 menunjukkan adanya interaksi berbagai skala atmosfer yang kompleks dan belum banyak dibahas dalam studi sebelumnya. Penelitian ini menganalisis mekanisme penguatan konveksi pada skala global, regional, dan lokal dengan mengintegrasikan indeks NINO 3.4, IOD, MJO, suhu permukaan laut, pola aliran angin, data ECMWF, serta citra satelit Himawari-8 band 13. Hasil analisis menunjukkan bahwa kombinasi La Niña dan IOD negatif yang diikuti anomali suhu permukaan laut positif di selatan Jawa membentuk latar kondisi basah yang signifikan, namun fase 4 MJO yang secara klimatologis cenderung melemahkan konveksi justru tidak menghambat perkembangan awan. Ketidaksesuaian ini dijelaskan oleh adanya penguatan konvergensi regional dan pendinginan suhu puncak awan hingga −76,9 °C, yang menandakan pertumbuhan awan konvektif secara intensif. Pada skala lokal, indeks stabilitas atmosfer menunjukkan kondisi labil yang memicu terbentuknya hujan sangat lebat pada 8 Oktober 2022 antara pukul 18.00–21.00 UTC. Temuan ini menegaskan bahwa hujan ekstrem di Cilacap bukan hanya dipicu oleh kondisi globa yang basah, tetapi oleh hubungan antara anomali termal regional dan ketidakstabilan lokal yang mampu meniadakan efek pelemahan konveksi dari MJO fase 4. Studi ini memberikan pemahaman yang lebih komprehensif mengenai dinamika berbagai skala pemicu hujan ekstrem di pesisir selatan Jawa dan dapat berkontribusi pada peningkatan akurasi peringatan dini banjir berbasis kondisi atmosfer aktual. Kata kunci : Hujan Lebat, Ecmwf, Citra Satelit, Observasi, Cilacap ABSTRACT The extreme rainfall event in Cilacap Regency on 8–9 October 2022, which triggered flooding on 9 October 2022 reflects the interaction of complex atmospheric processes across multiple scales and that has not been extensively explored in previous studies. This research investigates the mechanisms that enhanced convection at global, regional, and local scales by integrating the NINO 3.4 index, IOD, MJO, sea surface temperature, wind patterns, ECMWF data, and Himawari-8 band 13 satellite imagery. The analysis shows that the combination of La Niña and a negative IOD accompanied by positive sea surface temperature anomalies south of Java established a markedly moist background environment. However, despite the climatological tendency of MJO phase 4 to suppress convection, it did not inhibit cloud development during this event. This apparent inconsistency is explained by strengthened regional scale convergence and cloud top cooling reaching −76.9 °C, indicating vigorous convective growth. At the local scale, atmospheric stability indices reveal highly unstable conditions that triggered the very heavy rainfall observed on 8 October 2022 between 18.00–21.00 UTC. These findings demonstrate that the extreme rainfall in Cilacap was driven not only by moist global conditions but also by the interplay between regional thermal anomalies and local instability, which effectively counteracted the convective suppression typically associated with MJO phase 4. This study provides a more comprehensive understanding of the multiscale dynamics that trigger extreme rainfall along the southern coast of Java and contributes to improving the accuracy of flood early-warning systems based on real-time atmospheric conditions. Keywords : Heavy Rainfall, Ecmwf, Satellite Imagery, Observation, Cilacap

EFEKTIVITAS MODEL PEMBELAJARAN TARL BERBANTUAN AI GEMINI TERHADAP KEMAMPUAN BERPIKIR KRITIS DAN PEMECAHAN MASALAH PADA MATA KULIAH HIDRODINAMIKA Putri, Desy Hanisa; Medriati, Rosane; Ahda, Netriani Veminsyah; Utama, Tiara Hardyanti
Jurnal Kumparan Fisika Vol. 8 No. 3: Desember 2025
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.8.3.105-116

ABSTRAK Teknologi artificial intelligence (ai) berpotensi meningkatkan kemampuan berpikir kritis dan pemecahan masalah pada mahasiswa, khususnya pada mata kuliah hidrodinamika yang menuntut keterampilan analitis dan pemecahan masalah. Penelitian ini bertujuan menganalisis efektivitas pembelajaran berbantuan gemini dibandingkan pembelajaran konvensional. Metode penelitian menggunakan desain pretest–posttest dengan membandingkan n-gain berpikir kritis dan pemecahan masalah pada tiga kategori kemampuan awal (low, medium, high). Hasil menunjukkan bahwa kelas kontrol dengan pembelajaran konvensional hanya mengalami peningkatan rendah hingga sedang, baik pada kemampuan berpikir kritis maupun pemecahan masalah (n-gain 0,16–0,43). Sebaliknya, kelas eksperimen yang menggunakan ai-gemini mengalami peningkatan signifikan dengan n-gain berada pada kategori sedang hingga tinggi (0,47–0,76). Seluruh kelompok mencapai nilai post-test pada kategori tinggi–sangat tinggi. Temuan ini mengindikasikan bahwa integrasi ai gemini mampu memberikan umpan balik cepat, penjelasan adaptif, dan dukungan konseptual yang memperkuat pengembangan berpikir kritis dan kemampuan pemecahan masalah mahasiswa. Pembelajaran berbasis ai direkomendasikan sebagai alternatif inovatif dalam perkuliahan hidrodinamika. Kata kunci: Artificial Intelligence, Gemini, Hidrodinamika, berpikir kritis, pemecahan masalah. ABSTRACT The use of artificial intelligence (ai) technology has the potential to improve critical thinking and problem-solving skills in students, especially in hydrodynamics courses that require analytical and problem-solving skills. This study aims to analyze the effectiveness of gemini-assisted learning compared to conventional learning. The research method used a pretest–posttest design by comparing n-gain critical thinking and problem solving in three categories of initial abilities (low, medium, high). The results show that the control class with conventional learning only experienced low to moderate improvement in both critical thinking and problem solving abilities (n-gain 0.16–0.43). In contrast, the experimental class that used ai-gemini experienced a significant increase with n-gain in the moderate to high category (0.47–0.76). All groups achieved post-test scores in the high to very high category. These findings indicate that the integration of ai gemini is capable of providing rapid feedback, adaptive explanations, and conceptual support that strengthen the development of students' critical thinking and problem-solving skills. Ai-based learning is recommended as an innovative alternative in hydrodynamics lectures Keywords: Artificial Intelligence, Gemini, Hydrodynamics, critical thinking, problem solving.

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Aprina Defianti

Contact Email aprina.defianti@unib.ac.id

Phone -

Journal Mail Official jkf@unib.ac.id

Editorial Address Jl. WR Supratman Kandang Limun, Bengkulu, 38122

Location Kota bengkulu, Bengkulu INDONESIA

Abstract

Abstract

Abstract

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Contact Name
Aprina Defianti

Contact Email
aprina.defianti@unib.ac.id

Phone
-

Journal Mail Official
jkf@unib.ac.id

Editorial Address
Jl. WR Supratman Kandang Limun, Bengkulu, 38122

Location
Kota bengkulu,

Bengkulu

INDONESIA