Jurnal Riset Fisika Indonesia
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
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<![CDATA[Identifikasi Sesar dengan Menggunakan Metode Gaya Berat (Studi Kasus: Sulawesi Tengah) ]]>
<![CDATA[Rara Mutia]]>;
<![CDATA[Mardani Mardani]]>;
<![CDATA[Suci Fathia]]>;
<![CDATA[Tri Kusmita]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.3552
<![CDATA[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.]]>
<![CDATA[Analisis Uji Chemical Oxygen Demand (COD) pada Air Limbah Sawit di Dinas Lingkungan Hidup dan Kehutanan Provinsi Bangka Belitung ]]>
<![CDATA[Rusdianto Rusdianto]]>;
<![CDATA[Susanti Susanti]]>;
<![CDATA[Tri Kusmita]]>;
<![CDATA[Liyana Aryanto]]>;
<![CDATA[Talitha Talitha]]>;
<![CDATA[Mursid Mursid]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.3553
<![CDATA[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.]]>
<![CDATA[Pembuatan Minyak Kelapa Murni (Virgin Coconut Oil) dengan Metode Fermentasi dan Optimasi Waktu Simpan dan Penjernihan Menggunakan Ekstrak Daun Lada dan Karbon Aktif ]]>
<![CDATA[Heni Pornawati]]>;
<![CDATA[Herman Aldila]]>;
<![CDATA[Rena Aprilianti]]>;
<![CDATA[Dera Selviani]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.3555
<![CDATA[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.]]>
<![CDATA[Sintesis Teori A dan B sebagai Upaya Menjelaskan Inonsistensi Teori C dalam Proses Agitated Leaching Tailing Timah ]]>
<![CDATA[Muhammad Sahroni]]>;
<![CDATA[Anisa Indriawati]]>;
<![CDATA[Widodo Budi Kurniawan]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.4125
<![CDATA[Inkonsistensi teori C merupakan anomali dimana teori C tidak berlaku dalam proses Agitated Leaching. Hal ini menuntut penjelasan sehingga banyak peneliti berspekulasi untuk menjelaskannya. Contohnya teori A yang kontra- intuitif dan teori B yang cenderung menentang teori A. Dalam penelitian ini telah dilakukan penyelidikan terhadap teori A dan B melalui pendekatan tidak-langsung dengan variabel terikat dari proses Agitated Leaching adalah Total Dissolved Solid (TDS), laju pengadukan sebagai variabel bebas dan variabel tetap adalah rasio solid-likuid (1:20 Gr/mL) dan lama pengadukan (10 menit). Proses pelaruran dilakukan pada keadaan STP dan membatasi proses hanya pada tahap pelarutan sampel menggunakan HNO3 5%. Sampel yang digunakan adalah pasir tailing timah. Hasil penelitian menunjukkan bahwa inkonsistensi terjadi pada laju pengadukan 1000 rpm. Teori A1 tidak dapat disimpulkan keberlakuannya dalam proses pelindian tailing timah. Teori A2 berlaku dalam proses pelindian tailing timah. Teori B berlaku dalam proses pelindian tailing timah.]]>
<![CDATA[Pemodelan Anomali Self Potential (SP) Menggunakan Algoritma MVDE (Multi Variant Differential Evolution) ]]>
<![CDATA[Muhammad Budi Haryono]]>;
<![CDATA[Yekti Widyaningrum]]>;
<![CDATA[Herman Aldila]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.4162
<![CDATA[Self Potential (SP) is a practical and simple geophysical method. Interpretation of the data of these methods can be done qualitatively and quantitatively. Quantitative interpretation can be done through inversion modeling, but inversion modeling often has problems with the solution of model parameters that are stuck at local minima. Therefore, in this study the MVDE (Multi Variant Differential Evolution) algorithm is used which is able to solve model parameter problems, by finding global model parameter solutions. Inversion modeling of observation Self Potential (SP) anomaly data is carried out using an algorithm that has been tested and produces a misfit of ≤10%, the test aims so that the algorithm can be used further to model observation data. The observation Self Potential (SP) anomaly modeling produces model parameter values K=609.3mV D=9.3 h=3.75m q=1.51 and x=1-16, with a subsurface anomaly model in the form of a spherical geometry at depth 3.75m.]]>
<![CDATA[Pengaruh Iradiasi Gamma dan Asam Akrilat terhadap Sifat Mekanik Polimer Super Water Absorbent (SWA) Berbasis Onggok ]]>
<![CDATA[Indah Puspita]]>;
<![CDATA[Mersi Kurniati]]>;
<![CDATA[Christina Winarti]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.4163
<![CDATA[The Super Water Absorbent (SWA) polymer is a type of polymer that has exceptional water absorption capabilities while remaining insoluble in water. In this study, the authors conducted research on the modification of SWA by including acrylic acid and acrylamide monomers, followed by a crosslinking process utilising gamma irradiation. This study investigated the impact of acrylic acid and gamma irradiation on the mechanical characteristics of SWA. The experimental findings demonstrated a notable enhancement in the mechanical properties of the hydrogel by the incorporation of acrylic acid. This was evidenced by a substantial rise in the hardness value, which rose from 11.09 mJ to 36.13 mJ.]]>
<![CDATA[Identifikasi Pola Aliran Air Tanah di Lapangan Panas Bumi Non-Vulkanik Desa Nyelanding Kabupaten Bangka Selatan Berdasarkan Anomali Self-Potential ]]>
<![CDATA[Yekti Widyaningrum]]>;
<![CDATA[Anisa Indriawati]]>;
<![CDATA[Githa Nurvilia Afni]]>;
<![CDATA[Eri Gusnia]]>;
<![CDATA[Tri Kusmita]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
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DOI: 10.33019/jrfi.v3i2.4311
<![CDATA[As one of unique non-volcanic geothermal field in Indonesia, mapping the groundwater flow in Nyelanding Village, South Bangka is essential as preliminary study for further exploration activity if the geothermal manifestation. In order to achieve this goal, we conduct a research using natural electrical properties of subsurface, Self-Potentials (SP) method. In this study, fixed-based technique was used where the spacing between measurement stations is the multiplication of 10 m along three lines at the study area. Raw field data (potential value) was corrected to diurnal and closure corrections. Further, SP anomaly was plotted and combined with topography data to be analyzed. The result shows potential value raging from -25mV to 100mV which in agreement with the lowest and highest elevation in topography map, respectively. This means, these values are controlled by topographic feature in the study area. Thus, in conclusion, the groundwater flows from the West to North East and South East part of the study area]]>
<![CDATA[Identifikasi Sesar dengan Menggunakan Metode Gaya Berat (Studi Kasus: Sulawesi Tengah) ]]>
<![CDATA[Mutia, Rara]]>;
<![CDATA[Mardani, Mardani]]>;
<![CDATA[Fathia, Suci]]>;
<![CDATA[Kusmita, Tri]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
Show Abstract
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DOI: 10.33019/jrfi.v3i2.3552
<![CDATA[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.]]>
<![CDATA[Analisis Uji Chemical Oxygen Demand (COD) pada Air Limbah Sawit di Dinas Lingkungan Hidup dan Kehutanan Provinsi Bangka Belitung ]]>
<![CDATA[Rusdianto, Rusdianto]]>;
<![CDATA[Susanti, Susanti]]>;
<![CDATA[Kusmita, Tri]]>;
<![CDATA[Aryanto, Liyana]]>;
<![CDATA[Talitha, Talitha]]>;
<![CDATA[Mursid, Mursid]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
Show Abstract
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DOI: 10.33019/jrfi.v3i2.3553
<![CDATA[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.]]>
<![CDATA[Pembuatan Minyak Kelapa Murni (Virgin Coconut Oil) dengan Metode Fermentasi dan Optimasi Waktu Simpan dan Penjernihan Menggunakan Ekstrak Daun Lada dan Karbon Aktif ]]>
<![CDATA[Pornawati, Heni]]>;
<![CDATA[Aldila, Herman]]>;
<![CDATA[Aprilianti, Rena]]>;
<![CDATA[Selviani, Dera]]>
<![CDATA[ Jurnal Riset Fisika Indonesia Vol 3 No 2 (2023): Juni 2023 ]]>
Publisher : <![CDATA[Jurusan Fisika, Universitas Bangka Belitung ]]>
Show Abstract
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DOI: 10.33019/jrfi.v3i2.3555
<![CDATA[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.]]>
