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Tri Kusmita
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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 121 Documents
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Analisis Anomali Gravity Daerah Panas Bumi Non-Vulkanik Di Bangka Tengah (Studi Kasus Panas Bumi Terak dan Keretak) Gusnia, Eri; Kusmita, Tri; Indriawati, Anisa
Jurnal Riset Fisika Indonesia Vol 2 No 2 (2022): Juni 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v2i2.3233

Abstract

Central Bangka is one area that has geothermal potential such as the Terak and Keretak area. These area have hot spring manifestation. Geothermal manifestations in Bangka is the type of non-volcanic radiogenic geothermal. Origin sources of this manifestation suspected from rocks run into the crack, folds and faults. The purpose of this study was to identify rock speading in geothermal area and it’s correlation between geothermal manifestation in Terak and Keretak. The data obtained from the TOPEX/Poseidon satellite is in the form of FAA (Free Air Anomaly) data. The data is then corrected using Burger correction and field correction. Spectral analysis was performed by Fourier transform with moving average filter. The results showed that Complete Bouger Anomaly has 13 mGal-39 mGal. Regional anomaly has 5,4 mGal - 9.8 mGal. Residual anomaly has 7 mGal sampai 29 mGal. There area was consist of intrusive granite rock from the Granite Klabat formation, clas and sandstone from Tanjung Genting Formation. Gravity anomaly shown Geothermal Terak and Keretak are composed of the same distribution of rock.
Sebaran Batuan Daerah Panas bumi Terak Bangka Tengah berdasarkan Anomali Magnetik Alawiyah, Umi; Kusmita, Tri
Jurnal Riset Fisika Indonesia Vol 3 No 1 (2022): Desember 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i1.3356

Abstract

Geothermal potential in Indonesia has various non volcanic geothermal sources, one of which is geothermal in the Terak Village area of ​​Central Bangka. The geothermal geological structure of Terak is in the form of granite rocks with normal faults and horizontal faults or what is called the Pemali fault. The purpose of this research is to identify rock spreading on geothermal Terak based on magnetic anomaly. Magnetic data was processing by applied diurnal correction, IGRF correction, RTE (Reduce to the Equator) correction. Reginal dan residual anomaly was separation using upward continuation 350 m, 400 m, and 450 m. The result shown that rock spreading on geothermal Terak was consist by granite rock from Granite Klabat formation in north Mangkol Hill, sandstone from Tanjung Genting formation on West study area. Schist and phyllite was dominated on northeast and northwest area.
Sintesis dan Karakteristik CaCO3 dari Cangkang Kerang Kepah (Polymesoda erosa) sebagai Doping Anoda Baterai Lithium-Ion Trisakti, Yunior; Miratsi, Lizia; Kurniawan, Widodo Budi
Jurnal Riset Fisika Indonesia Vol 3 No 1 (2022): Desember 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i1.3548

Abstract

Synthesis and Characteristics of CaCO3 from Kepah Clam Shells (Polymesoda erosa) as Anode Doping of Lithium-Ion Batteries LTO (Lithium Titanate Oxide) or Li4Ti5O12 is one of the candidates for graphite replacement anode material in the production of Lithium-ion batteries. However, LTO materials have the disadvantage of low electrical conductivity, which limits the working level of the battery. Kepah clam shells are one of the wastes that have not been widely used even though the amount is still very abundant, and is expected to have the potential to be in the source of CaCO3 because it contains high amounts of calcium. Therefore, this study aims to determine the content of CaCO3 in the shell of the kepah clam (Polymesoda erosa) and determine the conductivity value of the LTO anode doped with CaCO3 of the kepah clam shell. The synthesis method used is the solid state reaction method with variations in doping concentrations of 0.00 mol, 0.10 mol, 0.15 mol, and 0.20 mol. The results of XRF analysis on the shell powder showed that the most dominant element content was Ca which was 97.63%. So it shows that calcium carbonate (CaCO3) from the shells of kepah mussels was successfully prepared. Furthermore, the anode active material was obtained, which if obtained XRD results and analyzed would show the absence of the CaCO3 phase, and there was no doping influence, then the active material powder was synthesized Li4Ti5O12 anode sheet doped CaCO3 shell. As for knowing the conductivity value of the Li4Ti5O12 anode sheet doped by CaCO3 clam shells, it is further characterized using Electrochemical Impedance Spectroscopy (EIS).
Identifikasi Sesar dengan Menggunakan Metode Gaya Berat (Studi Kasus: Sulawesi Tengah) Mutia, Rara; Mardani, Mardani; Fathia, Suci; Kusmita, Tri
Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i2.3552

Abstract

The study of the geological structure of Sulawesi Island, especially the Central Sulawesi region, is very interesting because it has high complexity as a result of the dynamic interactions of the world's three main plates. Indications of high seismic activity and deformation processes in the Central Sulawesi region can be found from the morphological appearance and activity of several existing faults such as the Palu-Koro fault, the Lawanopo fault, and the Matano fault. The data used in this study are secondary data measuring the distribution of gravitational field anomalies (FAA) and topographical data using the Topex application. At CBA values ranging from 31 mGal to 56 mGal. The height anomaly on the CBA contour map is shown in red to light purple which has a value range of 40.7 mGal to 62.7mGal. Low anomaly is shown in light green to blue which has a value range of 27.3 mGal to 3.2 mGal. The regional gravity anomaly values range from 5.1 mGal to 62.8 mGal with a distribution of gravity anomalies from south to north. While in this study it can only be explained that the residual anomaly value is influenced by rock type and density. The high anomaly found in the southern part is thought to be caused by rocks having high density and being in a sedimentary rock environment which has low density.
Analisis Uji Chemical Oxygen Demand (COD) pada Air Limbah Sawit di Dinas Lingkungan Hidup dan Kehutanan Provinsi Bangka Belitung Rusdianto, Rusdianto; Susanti, Susanti; Kusmita, Tri; Aryanto, Liyana; Talitha, Talitha; Mursid, Mursid
Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i2.3553

Abstract

Indonesia is the largest natural resource producing country in the world, the management of these natural resources requires assistance from various industries. In addition to providing an increase in the regional economy, industry can also cause an increase in waste which can cause environmental damage. Waste that is directly discharged into a water will cause a decrease in water quality, especially for palm oil liquid waste that has not met the specified wastewater quality standards. Chemical Oxygen Demand (COD) is one of the most important parameters in measuring water quality or water contamination load derived from dissolved oxygen in water or waste. Therefore, on this occasion, COD testing will be carried out to determine the level of dissolved oxygen in palm oil liquid waste. From the implementation of the calibration curve of COD testing in wastewater, it was declared accepted because the value of the test correlation coefficient was greater, namely r = 0.9994 than the value of the correlation coefficient set by SNI, namely r = 0.995. While precision data can be accepted if the value of % RPD is not greater than 10% of the test results.
Pengukuran Kualitas Air Limbah Sawit Berdasarkan Baku Mutu Air Limbah Menggunakan AAS Rusdianto, Rusdianto; Ivandi, Syachrul; Kusmita, Tri; Apriliazmi, Ilhafurroihan
Jurnal Riset Fisika Indonesia Vol 4 No 1 (2023): Desember 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i1.3554

Abstract

Palm oil industry waste is waste generated from the palm oil processing process. Palm oil liquid waste generally contains heavy metals, one of which is Cu and Zn. The presence of excessive Cu and Zn heavy metals can have a negative impact on living things and the surrounding environment. In this journal, the determination of the heavy metal content of Cu and Zn in palm oil wastewater was carried out using the AAS method with acetylene gas at a wavelength of 324.8 nm to determine the content of Cu metal content and at a wavelength of 213.9 nm to determine the Zn metal content. The results of determining the content of heavy metals Cu and Zn in sempel 1, 2 and 3 contained in palm oil wastewater which are still below the maximum limit of the quality standards obtained, namely less than 2 ppm for Cu metal and less than 5 ppm for Zn metal. utilized by living things and the surrounding environment.
Pembuatan Minyak Kelapa Murni (Virgin Coconut Oil) dengan Metode Fermentasi dan Optimasi Waktu Simpan dan Penjernihan Menggunakan Ekstrak Daun Lada dan Karbon Aktif Pornawati, Heni; Aldila, Herman; Aprilianti, Rena; Selviani, Dera
Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i2.3555

Abstract

Coconut oil is a valuable part of the coconut fruit and is widely used as an industrial raw material or part of it is made into cooking oil. Oil extraction from coconut meat can be done in several ways. Extraction of coconut oil that is being developed at this time is the fermentation method using several enzymes or microbes, one of which can be used is yeast tempeh. This research aims to analyze the yield content and quality criteria of coconut oil made using the fermentation method and to analyze the effect of adding pepper leaf extract and activated carbon on the shelf life and clarification of coconut oil. From the results of experiments carried out in mixing tempeh yeast, the free fatty acid test, yield test, aroma test and density test were carried out. As for the test results, the determination of free fatty acids in this cooking oil study used the titration method with NaOH until the color changed to pink. For the redemption test, the highest oil concentration was 3 grams, while the tempeh yeast 4 grams and 5 grams decreased. Aroma test where in week 9 coconut oil without treatment experienced rancidity. This was caused by auto-oxidation which began to form radicals due to the presence of fat peroxidation factors. The density test is close to the SNI standard value, namely the lowest density of 0.9600 g/cm3 obtained from closed treatment with 0.5 ml of extract. This is because in this treatment very little cooking oil is contaminated with other substances.
Kajian Potensi Gua Pandan sebagai Objek Geowisata Lampung Timur Ermana, Rinda; Dwiguna, Rezky Ariya; Hesti, Hesti; Mulyasari, Rahmi
Jurnal Riset Fisika Indonesia Vol 3 No 1 (2022): Desember 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i1.3639

Abstract

Indonesian tourism has developed in various sectors and regions in Indonesia. Various types of tourism have been presented in modern, traditional and rural forms. One of them is related to the development of geotourism in Indonesia. Geotourism has benefits, namely the welfare of the people who live around it, encouraging local people to participate in maintaining and developing geotourism, realizing sustainable tourism development, giving a distinct impression and experience for every tourist who comes. Pandan Cave is one of the geosites in Giri Mulyo, East Lampung. The Pandan Cave area is included in the Sukadana Lava lithology unit (Qbs). Pandan Cave in geomorphological studies includes structural landforms formed as a result of endogenous processes, in the form of lifting, folding, and faulting. This endogenous force is constructive. Pandan Cave has geotourism potential because of its unique geology, the various rock forms that make up Pandan Cave and its morphology are interesting things for tourists to study geology. In addition, the location of Pandan Cave which is in the plantation of residents close to the village, makes this tourist attraction an interesting place to visit.
Sifat Mekanik dan Densitas Ikatan Silang Hidrogel berbasis Tapioka Nanopartikel Puspita, Indah; Kurniati, Mersi
Jurnal Riset Fisika Indonesia Vol 3 No 1 (2022): Desember 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i1.3665

Abstract

Tapioca is a natural polymer that is widely used as a raw material for hydrogels. In order to improve the mechanical properties of tapioca-based hydrogels, this research modified tapioca by acid hydrolysis method for 2 hours and 24 hours and by ethanol precipitation method. This modified tapioca was further treated with epichlorohydrin with various concentrations of 0, 5, 10, and 20% to produce a three-dimensional cross-linked structure. The results showed that the increasing of epichlorohydrin concentration led to an increasing in the mechanical properties of the hydrogels consisting of hardness, stress, modulus of elasticity, and cross-linked density. The hydrogel from tapioca hydrolyzed for 24 hours and 20% epichlorohydrin was the sample with the best mechanical properties with a hardness of 19.78 mJ, a stress of 78.65 kPa, a modulus of elasticity of 233.84 mJ, and a cross-linked density of 57.61 × 1024 m-3.
Analisis b-value Gempabumi Menggunakan Metode Gutenberg-Richter Berdasarkan Estimasi Maximum Likelihood Di Daerah Sulawesi Utara Maulinda, Reski; Kusmita, Tri; Aldila, Herman; Triani, Triani
Jurnal Riset Fisika Indonesia Vol 4 No 2 (2024): Juni 2024
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i2.3804

Abstract

Sulawesi is an area prone to earthquakes. This is because the Sulawesi region is flanked by three main plates, namely the Pacific Ocean plate moving westward, the Australian Continental Plate moving northward, and the Eurasian Plate moving south-southeast. This situation causes a high level of seismicity in the Sulawesi region. The Sulawesi region has a fairly complex tectonic setting so that the activity of earthquakes in the Sulawesi region is also interesting to study. The level of seismicity depends on the degree of fragility of the rock (b-value) and the distribution of earthquakes in the region. This research was conducted to determine the b-value of earthquakes in the North Sulawesi region. The method used for this research is the Gutenberg-Richter method based on the Maximum Likelihood estimation. Maximum Likelihood Estimation is a method used to statistically calculate earthquake activity parameters. The software used are ArcGIS and Microsoft Excel. The research was conducted in North Sulawesi with coordinates 118° East - 125° East 1° North Latitude - 6° South Latitude. The data used is earthquake catalog data obtained from BMKG with earthquake data for a period of 10 years (2012-2021). Based on the results of the analysis of the distribution of seismicity based on magnitude, it is more towards the Sulawesi Sea and the distribution of seismicity based on depth is shallow. The result of calculating the b-value is 0.3537 and the a-value is 3.0932. It can be concluded that the North Sulawesi region has a fairly large chance of an earthquake occurring

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