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INDONESIA
Jurnal Fisika Indonesia
Published by Universitas Gadjah Mada
ISSN : 14102994     EISSN : 25798820     DOI : https://doi.org/10.22146/jfi.v23i3.41404
Core Subject : Science, Education,
Astronomy Earth & Planetary Sciences Education Energy Physics
Jurnal Fisika Indonesia (JFI) Is an open access scientific peer-reviewed journal published by Department of Physics Universitas Gadjah Mada that publishes researches on Physics, covering both theory, experiments, computation and applied physics including geophysics. We have a mission to build scientific research foundations in theoretical and applied physics to support education, research and community service in Indonesia. A manuscript can be written in English or in Bahasa Indonesia, but Abstracts are required to be written in English. All submitted manuscripts will be reviewed thoroughly by the committee of editors and reviewers. Publication in this journal is free of charge and is periodically done three times a year (April, August, and December).
Arjuna Subject : Fisika dan Astronomi - Condensed Matter Physics
Articles 220 Documents
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Study of Salty Taste Sensor Based Graphite PVC Electrode Modified with Polypyrrole-Carbon Black (PPy-CB) Diah Ayu Suci Kinasih
Jurnal Fisika Indonesia Vol 29, No 1 (2025): Vol 29, No 1 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i1.84159

Abstract

A successful salty taste sensor was developed using solid-contact electrodes with graphite PVC composite substrates. The fabricated sensor was characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The characterization results showed the addition of polypyrrole-carbon black (PPy-CB) material increased the capacitance, conductivity, and enlarged the graphite PVC electrode surface area. The selectivity of the sensor was measured on an electrode that has been coated with a lipid membrane mixture of tetradodecyl ammonium bromide (TDDAB) and 1-hexadecanol against basic taste samples using the impedimetric method and processed with PCA analysis. The result showed good salty taste selectivity with a silhouette coefficient value of 0.90. The constructed sensor demonstrated linear behavior towards standard salty substances (NaCl) with a sensitivity of -4.36 kΩ/decade and R2 = 0.99 in the sensing range of 0.1 to 30 mM. The study's findings suggest that graphite PVC electrodes modified with PPy-CB and lipid membrane combined with the impedimetric measurement method exhibit good selectivity and sensitivity in detecting salty taste.
Pengembangan Sensor Rasa Asin Impedimetrik Menggunakan Interdigitated Electrode Termodifikasi Membran Lipid 1-Hexadecanol Annisa Wachida Qurrata A'yun
Jurnal Fisika Indonesia Vol 29, No 1 (2025): Vol 29, No 1 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i1.85487

Abstract

This study proposes a method for evaluating salty taste using an impedimetric sensor based on an interdigitated electrode modified with a 1-hexadecanol lipid membrane. To improve the selectivity of the saltiness sensor, we optimized the total concentration of lipid/PVC/plasticizer in a THF solvent. The impedance response of the sensor was measured in a frequency range of 1 Hz - 100 kHz, then the feature extraction is performed based on frequency that has the greatest influence on the taste classification. From feature extraction, it is found that low frequency has a significant contribution to the taste classification so that the frequency range 1-108 Hz is taken to be analyzed using principal component analysis (PCA) and linear discriminant analysis (LDA) to determine the sensor's membrane performance on saltiness selectivity. Then, the silhouette coefficient score was calculated and compared between sensors to evaluate their saltiness selectivity. Our results show that the best lipid membrane concentration for sensor coating is 9 w/v%, with a silhouette coefficient score is 0.75 for PCA and the accuracy obtained from k-fold cross-validation using LDA is 100%. Furthermore, we used the optimized lipid membrane sensor to measure salt solution concentrations in water to test the sensor's sensitivity. Our results demonstrate that the impedance response decreases as the NaCl concentration increases.Keywords : taste sensor, lipid membrane, interdigitated electrode, impedimetric
Kajian Air Tanah Payau Menggunakan Metode Geolistrik Resistivitas dan Polarisasi Terinduksi Konfigurasi Schlumberger di Desa Dukuh dan Banyuripan Kecamatan Bayat Kabupaten Klaten Rika Indah Lestari; Eddy Hartantyo
Jurnal Fisika Indonesia Vol 29, No 1 (2025): Vol 29, No 1 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i1.86987

Abstract

The presence of saline groundwater in several locations in Bayat District, Klaten is quite interesting to study considering that the location is far from sea. It is known from previous measurement from several dug wells and it is found that the presence of saline water forms an irregular spot pattern, especially in two villages; Banyuripan and Dukuh. Subsurface information related to these spot patterns needs to be studied in order to determine the distribution and know the depth of saline groundwater and the lithology of the rocks.The measurements were conducted using VES (Vertical Electrical Sounding) Induced Polarization methods to determine the resistivity and the chargeability of the rocks. The data acquisition conducted in 10 sounding points using the Schlumberger configuration with 100m current’s length. The measurement results were processed using IPI2Win software to obtain 1D profiles. This profiles then correlated to produce resistivity and chargeability cross sections. The data interpretation was connected with secondary data in the form of physical, geological and geochemical parameter data.The results of the study found that saline water began to appear at a depth of 1.08 m in accordance with the local water table. The spotting pattern in Banyuripan and Dukuh seen to be separated connate water.
ZnCl2 - ACTIVATION OF COFFEE GROUNDS-DERIVED CARBON: OPTIMALIZATION OF PORE STRUCTURE AND EFFECTIVENESS OF ADSORPTION PERFORMANCE ON HOUSEHOLD WASTE PARAMETERS Fadhya Chania
Jurnal Fisika Indonesia Vol 29, No 2 (2025): Vol 29, No 2 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i2.90001

Abstract

Ampas kopi dapat dijadikan bahan baku pembuatan karbon aktif untuk mengurangi limbah cair rumah tangga. Ampas kopi diekstraksi dengan heksana dan etanol, kemudian dilakukan pencucian dan pengeringan. Aktivasi ampas kopi secara kimia, dilakukan dengan 15% larutan ZnCl2 dan metode impregnasi selama 24 jam. Sedangkan aktivasi secara fisika, dilakukan dengan proses karbonisasi pada suhu 500oC yang kemudian dilakukan perendaman dengan larutan 5% HCl untuk mengurangi kandungan abu pada karbon aktif. Karbon aktif dinetralkan serta diikuti dengan proses pengeringan dan pengayakan. Karakterisasi karbon aktif dilakukan dengan beberapa tahap yaitu, SEM, FTIR, PSA, COD, BOD, TSS, dan TDS. Hal ini bertujuan untuk mengetahui morofologi, gugus fungsi, ukuran partikel, dan mengetahui nilai penurunan masing – masing parameter uji sebelum dan sesudah dikontakkan dengan karbon aktif. Uji adsorbsi juga dilakukan dengan mengamati pengaruh jumlah polutan dan karbon aktif yang ditambahkan. Melalui hasil penelitian, didapatkan karbon aktif dengan bentuk morfologi yang dipengaruhi oleh penambahan ZnCl2 diikuti dengan adanya sifat polar serta mendapatkan ukuran karbon aktif yakni 1-100 nm. Selain itu, karbon aktif yang dihasilkan memiliki kemampuan adsorpsi yang baik serta memenuhi standar mutu limbah dan aman dibuang ke lingkungan.Kata-kata kunci: Adsorpsi, Aktivasi, Ampas Kopi, Karakterisasi, Karbon Aktif
KAJIAN BANDUL TERGANDENG PADA SEMBARANG SUDUT SIMPANGAN MENGGUNAKAN METODE RUNGE-KUTTA ORDE 4 Fatimah Arrahma
Jurnal Fisika Indonesia Vol 29, No 2 (2025): Vol 29, No 2 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i2.95575

Abstract

This research will analyze the motion of a coupled pendulum in various arbitrary initial value angles. Computations use the fourth-order Runge-Kutta which are implemented on the coupled pendulum nonlinear differential equation. There are two main modes in the results: the in-phase mode and the out-of-phase mode. Computation results are in agreement with those in the main reference for some small angles. Results also showed that the computational program could be implemented for solving a coupled pendulum nonlinear differential equations on large angles so that it could resolve the limitation of the Computer Algebra System (CAS) method.
SEISMIC ATTRIBUTE ANALYSIS OF FRACTURES IN THE MYA FIELD, EASTERN PART OF THE CENTRAL SUMATRA BASIN Darmiyana Darmiyana; Budi Eka Nurcahya
Jurnal Fisika Indonesia Vol 29, No 3 (2025): Vol 29, No 3 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i3.96428

Abstract

Indonesia's Natural Gas Balance Sheet 2018-2027 states that the supply of oil and gas tends to decrease, while the demand is expected to increase significantly by 2050. Therefore, the upstream oil and gas sector needs to continue to explore new reserves and develop old fields to meet Indonesia's oil and gas needs. The MYA field has been in production since 1976, this field is quite complex and is located in the Central Sumatra Basin which is one of the largest oil and gas contributing basins for Indonesia with the research target being the Telisa Formation which acts as a reservoir and cap rock. In an effort to fulfill the needs of oil and gas in the upstream sector, various techniques and methods continue to be developed to identify the presence of fractures acting as traps and hydrocarbon migration. This study uses well data and seismic data of MYA Field to attribute curvature, varience and ant-tracking to fractures in the eastern part of the Central Sumatra Basin.   Based on the results and data analysis in this study, it is found that the high area located in the NW and SE with a depth of about 250-550 ft, this area is assumed to be an anticline area, and the low structure pattern occupies the west to south at a depth of 2100-3100 ft, this area is assumed to be an area of hydrocarbon migration towards the anticline. The fault and fracture delineations in this study are similarly associated based on their orientation directions which are grouped into 3 fractures namely, oblique hinge, perpendicular hinge, and subparallel hinge. The total number of micro and macro fractures that can be extracted is 4656, dominated by hinge perpendicular fractures, which are faults perpendicular to the anticline axis, making it easier for fluid to migrate to the anticline area. In the MYA Field in the eastern part of the Central Sumatra Basin, there are 2 potential hydrocarbon zones, namely in the NW and SE of the research field which are recommended for developed in further exploration and production activities.
Solusi Numerik Persamaan Schrödinger Nonlinear dengan Potensial Sumur Ganda Menggunakan Skema Integrating Factor (IF) Fahrudin Nugroho; Irfan Taufiq Azhari; Pekik Nurwantoro
Jurnal Fisika Indonesia Vol 29, No 3 (2025): Vol 29, No 3 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i3.96639

Abstract

Pada penelitian ini, persamaan Schrödinger nonlinear dengan potensial sumur ganda (PSN-PSG) diselesaikan secara numerik menggunakan skema integrating factor (IF) dan metode pseudospectral. Varian skema IF yang biasa digunakan untuk menyelesaikan PSN (tanpa potensial sumur ganda) adalah skema exponential time differencing (ETD). Akan tetapi, berdasarkan hasil perbandingan beberapa varian skema IF yang dilakukan pada penelitian ini, diperoleh bahwa skema IFRK4 (IF dengan Runge-Kutta orde 4) lebih cocok digunakan untuk menyelesaikan PSN-PSG. Perilaku PSN-PSG diamati pada variasi koefisien kenonlinearan (\mathbit{\alpha}), tinggi tanggul potensial (\mathbit{V}_\mathbf{0}), dan titik minimum potensial (\mathbit{x}_\mathbit{m}) sebagai parameter kendali. Solusi pada setiap variasi parameter kendali ditampilkan dalam bentuk grafik spasial-temporal. Solusi-solusi tersebut menunjukkan penurunan jumlah terobosan terhadap kenaikan nilai \mathbit{\alpha} positif, dan berlaku sebaliknya pada kenaikan nilai \mathbit{\alpha} negatif, \mathbit{V}_\mathbf{0}, dan \mathbit{x}_\mathbit{m}. Karakteristik dinamika PSN-PSG yang diperoleh berdasarkan hasil analisis menggunakan autokorelasi dan spektrum daya menunjukkan hubungan frekuensi dominan dengan parameter kendali sebagai \mathbit{\omega}\propto\mathbit{\alpha}, \mathbit{\omega}\propto\mathbit{V}_\mathbf{0}, dan \mathbit{\omega}\propto\mathbit{e}^{-\mathbit{x}_\mathbit{m}}. Analisis menggunakan Poincaré plot dan eksponen Lyapunov pada pada nilai \mathbit{\alpha} yang lebih tinggi menunjukkan bahwa solusi PSN-PSG yang diperoleh merupakan dinamika order.
KAJIAN ETNOSAINS: ANALISIS KINEMATIKA DALAM PROSES PENGADUKAN TRADISIONAL GULA JAWA DAERAH KOKAP, KULON PROGO, DIY Maidani Mughnia Rizqa El-Burhani; Elsa Tia Intantri
Jurnal Fisika Indonesia Vol 29, No 3 (2025): Vol 29, No 3 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i3.96944

Abstract

Abstrak.  Penelitian ini bertujuan untuk menganalisis konsep fisika mekanik dalam pengolahan gula Jawa di daerah Kokap, Kulon Progo, DIY berdasarkan tradisi lokal. Metode penelitian yang digunakan adalah metode kuantitatif dan kualitatif deskriptif dengan teknik pengumpulan data observasi, wawancara, dan dokumentasi. Metode kuantitatif yang digunakan adalah dengan menganalisis hubungan antara gaya yang digunakan dalam proses nitis, kemudian menghitung kecepatan sudutnya. Fokus penelitian ini adalah proses tradisional pembuatan gula jawa. Proses pembuatan gula jawa akan ditinjau dari konsep fisika yang berkaitan dengan kinematika. Observasi dilakukan di Desa Sambeng, Hargorejo, Kokap, Kulon Progo, DIY. Peneliti juga melakukan wawancara terbuka untuk mengemukakan pandangan dan pendapat narasumber. Narasumber yang diwawancarai adalah pembuat gula jawa tradisional  di Desa Sambeng, Hargorejo, Kokap, Kulon Progo, DIY. Konsep-konsep ini diimplementasikan dalam berbagai tahapan pengolahan gula Jawa, mulai dari pemanasan nira, pengadukan saat proses nitis, dan pencetakan gula jawa. Penelitian ini juga menunjukkan bahwa tradisi lokal dalam pengolahan gula Jawa di Kokap memiliki nilai edukasi yang tinggi. Tradisi ini dapat menjadi sumber belajar bagi siswa untuk memahami konsep-konsep fisika mekanik secara konkret dan aplikatif. 
IDENTIFICATION OF CARBONATE RESERVOIR PRESENCE USING SPECTRAL DECOMPOSITION SEISMIC ATTRIBUTES IN THE AKSARA FIELD NORTH EAST JAVA BASIN Hana Salsabila Yufi
Jurnal Fisika Indonesia Vol 29, No 3 (2025): Vol 29, No 3 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i3.97113

Abstract

The Aksara Field, located offshore in the North East Java Basin, is a hydrocarbon exploration field targeting the Kujung and Ngimbang formations, which are dominated by carbonate rocks, shale, and marl inserts. To identify carbonate reservoirs as prospective hydrocarbon zones, a spectral decomposition seismic attribute analysis was conducted using the Continuous Wavelet Transform (CWT) method with low frequencies (15 Hz and 20 Hz) and high frequencies (45 Hz and 50 Hz). The data used included 3D Post Stack Time Migration seismic data, three well data points, and regional geological data. The research results indicated that the prospective hydrocarbon zone in the Kujung formation is located in the flank geological structure around the Pajang well, with carbonate sandstone distribution around three wells. In the Ngimbang formation, the prospective zone is situated in the anticline structure between the Janggar and Bitung wells, with the carbonate distribution primarily around the Janggar and Pajang wells.
3D VELOCITY MODEL OF PAPANDAYAN VOLCANO WEST JAVA USING DELAY TIME TOMOGRAPHY METHOD Lady Itsnia Ulinna'mah
Jurnal Fisika Indonesia Vol 29, No 3 (2025): Vol 29, No 3 (2025)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v29i3.97539

Abstract

Papandayan volcano in West Java is one of the volcanoes in Indonesia. In history, Papandayan volcano it had erupted in 1772, 1923, 1942 and 2002. The eruption period in 2002 had stopped, but Papandayan volcano still shows high volcano-tectonic (VT) activities. The activity also followed increasing in status into “siaga” level occurred in 2010, 2011, 2012 and 2012. So, for knowing 3D velocity model that representation of the hot area or weak, we need to had been a research of delay time tomography.The research used volcanic earthquake data by recorded from 5 permanent stations and 5 temporary stations. The data processing had been set earthquake type and picking arrival time from VT earthquake. We input arrival time to knowing hypocenter by Geiger method. We get the velocity variation from matrix inversion by least square method. The input of least square inversion used delay time from the difference between travel time of observation and calculation.The research has shown that hypocenter of VT earthquake line under Mas crater at depth 1 km above mean sea level (MSL) to 5 km beneath MSL. Inversion of tomography has been shown anomaly zone of low velocity in depth 5 km beneath MSL. This zone associated with VT earthquake location. It has physics characteristic such brittle, heterogenic, and hot. The anomaly zone can be interpreted as the hot material zone which associated with a residue of shallow magma chamber or effect of volcanic-tectonic activities from a long time ago. 

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