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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

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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.
Metode Analisis Model Peluruhan Bahan Radioaktif dengan Menggunakan Sensor Gaya dan Rekaman Video Yosephine Novita Apriati; Ign Edi Santosa
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2017: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2017
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (713.512 KB) | DOI: 10.20961/prosidingsnfa.v2i0.16412

Abstract

Abstract: The number of decayed radioactive materials each time leads to the exponential law. Process of the decaying radioactive materials can’t easily be seen, so it can be modeled using the flow of water from a vertical column through a pipe. A force sensor can be used to collect data that showing the decline of water surface in a column. A pipe inserted in a tube contain of water is suspended in the force sensor. The force sensor is connected to a computer. The output shows an exponential graph identical to the exponential law of radioactive decay graph. Another method to collect data for height of water surface each time is using a camera. A video of the declining water surface can be analyzed using video analyzer from Logger Pro. The graph result is also identical with the radioactive decay graph. From both of the methods the decay constant can be found. By using a pipe with radius cm the decay constant for force sensor and camera methods consequently are  and  The method using a video record that being analyzed by video analyzer is easier to be done because the tools are easy to get. A camera can even be found in a cellphone and an application providing video analysis also can easily be downloaded from the internet. Abstrak: Jumlah bahan radioaktif yang meluruh setiap waktu mengikuti grafik eksponensial. Peristiwa peluruhan bahan radioaktif yang sulit diamati dapat dimodelkan dengan menggunakan peristiwa penurunan air dalam suatu tabung yang diberi pipa keluaran. Salah satu metode pencatatan data peristiwa penurunan tersebut dilakukan dengan menggunakan sensor gaya. Sebuah tabung berisi air yang diberi pipa keluaran digantungkan pada sebuah sensor gaya yang dihubungkan dengan komputer. Hasil grafik berat air setiap waktu menunjukkan grafik eksponensial yang identik dengan grafik peluruhan bahan radioaktif. Metode lain yang dapat dilakukan adalah dengan merekam ketinggian air setiap waktu di dalam tabung menggunakan kamera. Hasil rekaman dianalisis dengan menggunakan aplikasi video analyzer dari software Logger Pro. Hasil analisis menunjukkan ketinggian air setiap waktu mengikuti grafik peluruhan bahan radioaktif. Dengan menggunakan pipa keluaran berukuran  cm diperoleh nilai konstanta peluruhan dengan metode sensor gaya dan metode rekaman secara berturut-turut adalah  dan  Metode dengan rekaman video yang dianalisis dengan aplikasi video analyzer dari software Logger Pro  lebih mudah dilakukan karena hanya membutuhkan sebuah kamera perekam. Aplikasi video analyzer juga mudah diunduh di internet.
Pengukuran Modulus Young dengan Analisis Keadaan Resonansi Batang Aluminium yang Bergetar Menggunakan ImageMeter Maria Tefa; Ign Edi Santosa
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2017: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2017
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1316.053 KB) | DOI: 10.20961/prosidingsnfa.v2i0.21370

Abstract

Abstract: An experiment to determine Young’s Modulus by analyzing the vibrations of an aluminum bar has been conducted. The aluminium bar is vibrated by the magnetic field. A tiny magnet is glued at the free end of the bar. A coil carrying an alternating current generates an alternating magnetic field. The resonance condition is investigated by the measurement of its wavelength using the ImageMeter application. The natural frequency of the aluminum bar is determined from the measurement of its resonance frequencies. The natural frequency and the bar length are used to calculate Young’s Modulus. The experimental data shows the Young’s Modulus of aluminum is . This measurement method is used for learning purposes. Abstrak: Telah dilakukan pengukuran nilai Modulus Young dengan analisis getaran dari sebuah batang aluminium. Batang aluminium digetarkan dengan medan magnet. Magnet kecil ditempelkan pada bagian ujung batang aluminium yang bebas. Sebuah kumparan yang berada di bawah ujung batang aluminium  diberi arus bolak balik yang dapat diatur frekuensinya. Pada frekuensi tertentu akan terjadi resonansi dengan mengikuti pola yang khas. Keadaan resonansi batang aluminium ini dibuktikan dari hasil pengukuran panjang λ menggunakan aplikasi ImageMeter. Selanjutnya frekuensi alami batang aluminium ditentukan dari pengukuran frekuensi resonansinya. Nilai Modulus Young aluminium dihitung dari nilai frekuensi alami dan panjang batang. Dari hasil pengukuran diperoleh nilai Modulus Young . Metoda pengukuran ini digunakan untuk keperluan pembelajaran.
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) (
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.
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.
Co-Authors Agnes Nora Iska Harnita Frans J.M. Harren Maria Tefa Sitarina Widyarini Sudarsono Sudarsono Sudibyo Martono Yosephine Novita Apriati