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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) JURNAL FISIKA Jurnal Pembelajaran Fisika Momentum: Physics Education Journal Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) Indonesian Journal of Chemistry
Ign Edi Santosa
Sanata Dharma University, Indonesia
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics

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Students’ Understanding on Physics Equations Used in the Experiment Ign Edi Santosa
Jurnal Pembelajaran Fisika Vol 9, No 2 (2021): Jurnal Pembelajaran Fisika
Publisher : Jurnal Pembelajaran Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study investigates the students’ understanding of physics equations used in the experiment. Here 91 students participated in this qualitative study. All of them worked on the experiment to determine the specific charge of an electron e/m. In this case, physics equations are derived to provide the basis of the experimental method in order to obtain the desired value of e/m. Students’ understanding of physics equations was observed through an initial test, their experimental report, and a final test. The final test reveals that many students perceive the equations as a mathematical tool. As a result, about 64 % of the participant states that e/m depends on the variable in the experiment e.g. the current or the accelerating potential. They do not realize that e/m is a constant.Keywords: physics equation, experiment, specific charge, electron.DOI: http://dx.doi.org/10.23960/jpf.v9.n2.202106
Penerapan Penghalusan Savitzky-Golay pada Pengukuran Konsentrasi Etilen dengan Detektor Fotoakustik Ign Edi Santosa
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 3 No. 2 (2013)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v3n2.p37-43

Abstract

Telah dilakukan pengukuran konsentrasi etilen dari biocream yang dikenai paparan sinar ultraviolet. Pengukuran dilakukan dengan detektor fotoakustik. Untuk mengurangi efek derau, telah dilakukan penghalusan dengan metoda Savitzky-Golay. Hasil penghalusan tergantung pada orde polinomialnyadan jumlah titik data untuk fiting.
Inhibition of Lipid Peroxidation Induced by Ultraviolet Radiation by Crude Phlorotannis Isolated from Brown Algae Sargassum hystrix v. buxifolium C. Agardh Agnes Nora Iska Harnita; Ign. Edi Santosa; Sudibyo Martono; Sudarsono Sudarsono; Sitarina Widyarini; Frans J.M. Harren
Indonesian Journal of Chemistry Vol 13, No 1 (2013)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2295.873 KB) | DOI: 10.22146/ijc.21320

Abstract

This study examines the antioxidant activity of crude phlorotannins from the brown algae Sargassum hystrix v. buxifolium (Chauvin) J. Agardh, through the inhibition of a lipid peroxidation reaction that is induced by the UV radiation. The antioxidant activity during the UV exposure was investigated using the laser-based photoacoustic method for the detection of the ethylene as indicator for lipid peroxidation. This involves an experiment that isolated crude phlorotannins from the ethyl acetate fraction of the Sargassum hystrix methanol extract, hereafter referred to as PFSH. It results in the antioxidant activity as a potent lipid peroxidation inhibitor. Statistically, such antioxidant activity is not significantly different than the commercial antioxidant, which is vitamin C (p > 0.05). The amount of the total phlorotannins, using the Folin-Ciocalteu method, was measured to be approximately 0.13% w/w. In addition, it is found that PFSH contains phlorotannins with low molecular weight (MW) (
Penggunaan Detektor Fotoakustik Untuk Pengukuran Etilen Pada Proses Peroksidasi Lipid Yang Diinduksi Sinar Ultraviolet Santosa, Ign Edi
Jurnal Fisika Vol 10, No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v10i2.25535

Abstract

Pengukuran gas etilen dari proses peroksidasi lipid akibat paparan sinar ultraviolet telah dilakukan dengan menggunakan detektor fotoakustik berbasis laser CO2. Biocream dioleskan pada permukaan kaca dan dimasukkan ke dalam cuvet. Pengukuran konsentrasi etilen dilakukan selama biocream disinari dengan sinar ultraviolet. Hasil eksperimen menunjukkan bahwa etilen yang dihasilkan tergantung pada intensitas sinar ultraviolet dan jumlah lipid yang terkena paparannya.
Pengukuran Koefisien Redaman Magnetik pada Magnet yang Bergerak di Atas Air Track Menggunakan Diagram Fase Bernadetta Dwi Paskariana; Ign Edi Santosa
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2025: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2025
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prosidingsnfa.v0i0.115742

Abstract

Telah dilakukan pengamatan gerak magnet di atas air track aluminium yang dipasang miring. Magnet ditempatkan pada sisi glider dan dilepas tanpa kecepatan awal pada air track. Magnet akan bergerak karena gaya beratnya. Karena geraknya, magnet juga akan mengalami gaya redaman yang nilainya tergantung pada kecepatannya. Akibatnya akan didapat resultan gaya sama dengan nol, sehingga kecepatannya menjadi konstan, atau mencapai kecepatan terminal. Gerakan ini direkam dengan kamera digital 60 FPS Pengukuran redaman magnetik dilakukan melalui analisa video menggunakan aplikasi Tracker dan Logger Pro, sedang pengukuran medan magnet menggunakan aplikasi Phyphox. Dari analisa video akan diperoleh data posisi, kecepatan dan percepatan terhadap waktu. Hasil pengukuran menunjukkan bahwa semakin banyak jumlah magnet, semakin besar redaman yang terjadi, ditandai dengan percepatan yang menurun hingga mencapai kecepatan konstan. Diagram fase berupa grafik percepatan terhadap kecepatan membentuk garis linier yang digunakan untuk menentukan koefisien redaman magnetik. Penelitian ini juga relevan dalam pembelajaran fisika karena dapat memperkuat pemahaman konsep gaya, percepatan, dan kecepatan terminal melalui eksperimen berbasis teknologi digital.
Representation and content in student's exam note sheets Ignatius Edi Santosa
Momentum: Physics Education Journal Vol. 6 No. 2 (2022)
Publisher : Universitas PGRI Kanjuruhan Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21067/mpej.v6i2.6320

Abstract

Various forms of representation are used to understand physics concepts. This study aims to reveal the representations used by students in summarizing their physics teaching materials. The observed representations include mathematical equations, verbal statements and graphs. The participants were students who attended lectures in two academic years, namely 2016 and 2018. Students were permitted to freely write a summary of lecture material that would be used as resources during the exam. The research investigated the types of representations used and their percentages. In addition, the content in the summary was also taken into consideration. The results showed that the representation of mathematical equations or formulas, verbal explanations and graphs were used by 100%, 97% and 40% of the total students, respectively. This finding is also reflected in the percentage of paper area used in the summary; the uses of formulas are 60%, verbal explanations are 32.5% and the remaining 4.2% are graphs. Most note sheets contain almost all of teaching material. This students’ tendency should be considered for teaching strategy.
Co-Authors Agnes Nora Iska Harnita Bernadetta Dwi Paskariana Frans J.M. Harren Maria Tefa Sitarina Widyarini Sudarsono Sudarsono Sudibyo Martono Yosephine Novita Apriati