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Tri Kusmita
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Gedung Penelitian, Fakultas Teknik, Universitas Bangka Belitung Jl. Kampus Peradaban, Merawang, Bangka 33172, Kep. Bangka Belitung, Indonesia
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Jurnal Riset Fisika Indonesia
Published by Universitas Bangka Belitung
ISSN : 27761460     EISSN : 27976513     DOI : https://doi.org/10.33019/jrfi.v1i2
Core Subject : Science,
Astronomy Computer Science & IT Earth & Planetary Sciences Materials Science & Nanotechnology Physics
The Jurnal Riset Fisika Indonesia (JRFI) (e-ISSN: 2797-6513; p-ISSN: 2776-1460) is an open access and peer-reviewed journal, published by Department of Physics - Universitas Bangka Belitung, which is a dissemination medium for research result from scientists, engineers, and practitioners in many fields of physics. JRFI is a biannual journal issued on December and June. The editors welcome submissions of papers describing recent theoretical and experimental research related to: (1) Theoretical articles; (2) Empirical studies; (3) Practice-oriented papers; (4) Case studies; (5) Review of papers, books, and resources. Focus and scope for JRFI as follows: Theoretical physics Computational physics Material physics Geophysics Instrumentation Applied physics
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 9 Documents
 1 
Search results for , issue "Vol 6 No 01: Desember 2025" : 9 Documents clear
Analisis Spasial Zona Risiko Gempabumi Berdasarkan Intensitas Seismik dan Peak Ground Acceleration (PGA) di Provinsi Bengkulu Periode 2012–2021 Farika, Nurahmi; Kusmita, Tri; Kurniawan, Widodo Budi
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.3818

Abstract

Bengkulu Province is characterized by high seismic activity due to the influence of complex regional tectonic systems, which necessitates a comprehensive assessment of earthquake risk to support effective disaster mitigation. This study aims to delineate earthquake risk zones in Bengkulu Province based on Peak Ground Acceleration (PGA) and earthquake intensity. The analysis utilizes earthquake data recorded between 2012 and 2021 with magnitudes ≥ 3 and focal depths ranging from 0 to 100 km. Earthquake magnitudes originally reported as Mb, Mw, and Ms were converted to a uniform magnitude scale, namely surface wave magnitude (Ms). PGA values were calculated using the Gutenberg–Richter and McGuire empirical models, while earthquake intensity was estimated using an empirical relationship between surface wave magnitude and intensity. The results indicate that PGA values in Bengkulu Province range from 10 to 510 gal, with corresponding earthquake intensities varying from III to IX–X on the Modified Mercalli Intensity (MMI) scale. The highest earthquake risk is identified in Seluma Regency, whereas other regions exhibit low to moderate risk levels. The integrated spatial analysis of PGA and earthquake intensity provides a representative earthquake risk zonation that can serve as a scientific basis for earthquake mitigation planning and the implementation of seismic-resistant building design in Bengkulu Province.
The Temporal Variation b-Value Temporal Variation of b-Value in Bengkulu Province Using the Maximum Likelihood Method (Earthquake Case Study 2012-2022) Sari, Elmi Permata; Kusmita, Tri; Kurniawan, Widodo Budi
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.4389

Abstract

Bengkulu Province is a region of high seismicity influenced by the complex interaction between the offshore subduction zone along the western margin of Sumatra and active strike-slip fault systems on land. This study investigates the temporal variation of earthquake b-values in Bengkulu Province during the period 2012–2022 using the Maximum Likelihood approach. The analysis focuses on temporal changes in the frequency–magnitude distribution and the evolving characteristics of regional seismicity. The results show clear temporal variations in b-values, indicating changes in the frequency–magnitude distribution of earthquakes over time. Variations in the a- and b-values reflect shifts in the seismicity characteristics within the framework of Bengkulu’s active tectonic setting, particularly the interaction between the Indo-Australian–Eurasian subduction system and onshore active faults. Overall, the results demonstrate that temporal changes in b-values represent the dynamics of regional seismicity in Bengkulu within an active subduction–fault tectonic framework.
Pengaruh Konsentrasi Larutan Elektrolit NaCl Terhadap Sintesis Nanopartikel SnO2 Dari Plat Timah Menggunakan Metode Elektrokimia febrianti, eka; Kurniawan, Widodo Budi; Aldila, Herman
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.5193

Abstract

Nanopartikel merupakan partikel dengan ukuran nanometer, yaitu sekitar 1-100 nm. Nanopartikel SnO2 adalah partikel berukuran nano yang terbuat dari timah dioksida. SnO2 (timah dioksida) memiliki keunggulan seperti sifat optik yang baik, tidak beracun, aktivitas fotokatalitik yang baik, luas permukaan yang besar, stabilitas mekanik dan termal yang baik, stabilitas fisik dan kimia yang tinggi, kapasitas adsorpsi yang tinggi dan ramah lingkungan. Nanopartikel SnO2 dapat disintesis menggunakan metode elektrokimia. Metode elektrokimia dapat mengontrol ukuran partikel. Oleh karena itu tujuan penelitian ini adalah untuk mengetahui pengaruh konsentrasi molaritas terhadap ukuran partikel dengan memvariasikan molaritas NaCl yaitu 0,01M, 0,02M, 0,03M dan 0,04M. Berdasarkan penelitian ini pengaruh konsentrasi molaritas NaCl menghasilkan ukuran partikel SnO2 yang berbeda-beda. Ukuran nanopartikel terkecil diperoleh pada variasi 0,01M yaitu 4,08 nm. Kemurnian nanopartikel SnO2 diperoleh sebesar 97,516% dan fase kristal yang terbentuk adalah tetragonal.
Pengaruh Konsentrasi Kitosan Terhadap Karakteristik Bioplastik Selulosa Batang Pisang dengan Plasticizer Gliserol oktavia, oktavia; Puspita, Indah; Kusmita, Tri; Utami, Rizka
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.5196

Abstract

The development of bioplastics has continued to grow as an alternative material based on renewable natural resources. Cellulose is a natural polymer that is widely used as a raw material for bioplastics; however, cellulose-based bioplastics generally show limited mechanical stability and rigidity. Therefore, the addition of chitosan and glycerol is required to improve their characteristics. This study aims to determine the cellulose content and functional groups of banana stem cellulose and to analyze the effect of chitosan concentration on the thickness, mechanical properties, and degradation rate of banana stem cellulose-based bioplastics using glycerol as a plasticizer. Bioplastics were synthesized by varying the chitosan concentration at 1%, 2%, 3%, and 4%. The results showed that the cellulose content of banana stems reached 93%, with the presence of –OH, –CH, and –CO functional groups. The variation in chitosan concentration affected the thickness, tensile strength, elongation at break, and degradation rate of the bioplastics. An increase in chitosan concentration resulted in a decrease in thickness and elongation, while tensile strength and degradation rate increased with higher chitosan content. These results indicate that chitosan concentration significantly influences the physical, mechanical, and degradation properties of banana stem cellulose-based bioplastics, demonstrating their potential as biodegradable materials.
Sintesis dan Karakterisasi Hidrogel Limbah Onggok dan Polyvinyl Alcohol (PVA) mengandung Ekstrak Lada sebagai Pemballut Luka Antibakteri Rokar, Risna Kirana; Puspita, Indah; Indriawati, Anisa
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.5197

Abstract

Wound healing is a complex biological process in which wound dressings play a vital role in providing protection and supporting tissue regeneration. In this study, cassava dregs waste was utilized as a base material for the development of hydrogel wound dressings. The hydrogel was incorporated with black pepper (Piper nigrum) extract to enhance its antibacterial properties. Sample preparation consisted of several stages, including cassava dregs processing, hydrogel synthesis, and extraction of black pepper using the maceration method. The hydrogel was characterized in terms of swelling capacity, gel fraction, swelling kinetics, antibacterial activity against Staphylococcus aureus, functional group identification using Fourier Transform Infrared (FTIR) spectroscopy, and morphological analysis. The results demonstrated that the incorporation of black pepper extract significantly affected the swelling behavior of the hydrogel, with swelling capacities ranging from 263.76% to 387.87%. The hydrogel exhibited a high gel fraction of 86.13% and favorable swelling kinetics with a kinetic constant of 0.5443. Variations in black pepper extract volume were evaluated, including 0 ml (control), 20 ml, 40 ml, and 60 ml. These findings indicate that cassava dregs–based hydrogels enriched with black pepper extract have promising potential as antibacterial wound dressing materials.
Eksplorasi Endapan Bauksit Menggunakan Metode Polarisasi Terimbas dan Resistivitas di Desa Sebemban, Kalimantan Barat Handika; Arman, Yudha; Muhardi, Muhardi
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.5600

Abstract

Tayan Hilir District, West Kalimantan Province, Indonesia, is characterized by the presence of economically valuable mineral resources, particularly bauxite deposits. This study aims to delineate the distribution of bauxite deposits in Sebemban Village, Tayan Hilir District, using integrated geophysical approaches. The investigation employed the induced polarization (IP) and electrical resistivity methods with a dipole–dipole electrode configuration. Resistivity and chargeability measurements were conducted along three survey lines, each 156 m in length with an electrode spacing of 4 m. The results show that the resistivity values range from 45.36 to 367.177 Ω·m, while the chargeability values vary between 16.9 and 878.80 ms. The subsurface stratigraphy of the study area comprises latosol, bauxite, saprolite, and bedrock units, including granodiorite and quartz diorite. Bauxite mineralization was identified at shallow depths, commencing at approximately 0.6 m below the ground surface. These results indicate that the combined application of resistivity and induced polarization methods is effective for identifying and characterizing near-surface bauxite deposits in the study area.
Fabrikasi Material Komposit Anti Peluru Carbon Fiber-Epoxy Resin Berpenguat Nanokristal Selulosa Berbasis Limbah Kertas Roehafi, Firza; Herman Aldila
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.6845

Abstract

Waste paper contains up to 64.84% cellulose, making it a potential raw material for the synthesis of nanocrystalline cellulose (NCC) via sulfuric acid (H₂SO₄) hydrolysis. The use of 1M H₂SO₄ produced NCC with favorable characteristics, including a cellulose purity of 80.79%, a crystallinity index of 88.73%, and a crystal size of 3.18 nm. Subsequently, bulletproof composites were fabricated using carbon fiber–epoxy resin reinforced with nanocrystalline cellulose. The independent variable in this study was the ratio between nanocrystalline cellulose powder and epoxy resin. The fabricated bulletproof composites measured 200 × 200 mm in area and had a thickness of 20 mm. The results showed that composites containing 0% and 10% NCC (designated as KAP-01 and KAP-02) were capable of withstanding the impact of 9×19 mm handgun bullets, meeting the requirements of NIJ Standard-0101.04 Level IIIA. However, the bulletproof composites in this study were not able to resist penetration from 5.56×45 mm rifle rounds.  
Analisis Fraktal untuk Pengembangan Motif Batik Indonesia: Perpaduan Fisika dan Budaya Kumala, Siti Ayu; Nur Huda, Didik; Nengsih, Retno
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.6852

Abstract

Batik as part of the Indonesian culture was recognized as an Intangible Cultural Heritage by UNESCO in 2009. Batik is not only a cultural product, but also a representation of a complex visual structure. As science and technology develop, a physico-mathematical approach to batik motifs, particularly through fractal theory, has begun to attract the attention of researchers. A fractal is a geometric shape that has a repeating pattern at various scales. This study aims to develop a fractal pattern using the Julia set to obtain a batik motif pattern. This will greatly assist the batik industry in producing batik with various motifs automatically. The method used is to modify the Julia equation, the next step is to perform a transformation in the form of rotation or dilation. Then the results obtained are visualized using Python programming. The constants used are varied with a value of -1 < c < 1, the order of the equation also uses a higher order. The visualization results are then compared with existing batik motifs and the best one is selected. The results showed that certain parameter modifications produced fractal patterns similar to traditional designs such as kawung batik, while others revealed unexpected analogies to natural and physical phenomena like dicotyledonous and monocotyledonous stems patterns and floral motifs.
Analisis Band Power, Relative Power, dan Entropi Sinyal EEG saat Relaksasi dengan Mata Tertutup berdasarkan Brain Region Robiyana, Iqbal; Nurizati; Sumardi, Tedi; Ramadhan, Aditia; Suhendra, Muhammad Agung
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.6895

Abstract

Electroencephalography (EEG) is a widely used neurophysiological method for monitoring brain activity through scalp electrodes. This study investigates EEG signal characteristics in a resting state with eyes closed, focusing on three quantitative features: band power, relative power, and entropy. The experiment involved five healthy volunteers who were instructed to sit in a relaxed position with eyes closed for five minutes in a quiet, dimly lit room. EEG signals were recorded using an Emotiv EPOC+ device with 14 channels placed according to the international 10–20 system. The recorded signals were processed in MATLAB, including bandpass filtering (1–50 Hz), baseline correction, and artifact rejection. Subsequently, the signals were segmented into two-second epochs for feature extraction. Band power was calculated using the Fast Fourier Transform (FFT) for delta (0.5–4 Hz), theta (4–8 Hz), alpha (8–13 Hz), and beta (13–30 Hz) bands. Relative power was computed as the ratio of each band’s power to the total power of the signal, while signal entropy was estimated using Shannon entropy to assess complexity. EEG channels were grouped into four brain regions: frontal, temporal, parietal, and occipital. Results show that the occipital region exhibited the highest average band power, consistent with dominant alpha activity during eye closure. Relative power distributions were uniform across subjects and regions. The highest entropy values were observed in the temporal and frontal regions, indicating higher signal complexity in those areas. These findings highlight the effectiveness of combining spectral and nonlinear features to characterize brain activity during rest and provide valuable baselines for future applications in Brain-Computer Interfaces (BCI), stress detection, and neuropsychological mapping.

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