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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 112 Documents
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Studi Kinetika Pada Proses Elektrokoagulasi Zat Warna Metilen Biru Andrian Saputra; Yuant Tiandho; Fitri Afriani
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.v3i1.3230

Abstract

Permasalahan utama yang umumnya dihadapi para pelaku industri tekstil yaitu berkaitan dengan banyaknya jumlah limbah cair yang dihasilkan. Limbah cair pewarna metilen biru tidak dapat dibuang secara langsung ke perairan karena memiliki tingkat kelarutan yang tinggi dan bersifat non-biodegradable. Oleh karena itu, dalam penelitian ini dilakukan pengolahan limbah cair pewarna metilen biru dengan menggunakan metode elektrokoagulasi yang mudah diterapkan dengan tingkat efisiensi pemisahan kadar polutan dalam air limbah yang tinggi. Tahapan selanjutnya dilakukan dekolorisasi pada limbah pewarna metilen biru dengan variasi tegangan yang diberikan sebesar 20,25, dan 30 volt serta variasi waktu yang digunakan selama 1,3,5,10,15,20,25, dan 30 menit. Berdasarkan hasil penelitian menunjukkan bahwa semakin besar tegangan listrik dan semakin lama proses elektrokoagulasi dilakukan maka semakin tinggi pula nilai dekolorisasi yang dihasilkan limbah pewarna metilen biru tersebut. Hasil dekoloriasasi yang diperoleh kemudian dilanjutkan dengan melakukan analisis laju reaksi yang menunjukkan perubahan konsentrasi metilen biru yang berbanding lurus dengan waktu yang diberikan. Analisis laju reaksi dilakukan dengan menggunakan model kinetika reaksi yaitu orde satu, orde dua, dan BMG. Berdasarkan nilai yang dihasilkan dari ketiga model kinetika reaksi, model kinetika BMG merupakan model kinetika reaksi yang terbaik dikarenakan memiliki nilai koefisien determinasi (R2) yang tinggi yaitu sebesar 0,999.
Sebaran Batuan Daerah Panas bumi Terak Bangka Tengah berdasarkan Anomali Magnetik Umi Alawiyah; Tri Kusmita
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 Yunior Trisakti; Lizia Miratsi; Widodo Budi Kurniawan
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).
Kajian Potensi Gua Pandan sebagai Objek Geowisata Lampung Timur Rinda Ermana; Rezky Ariya Dwiguna; Hesti Hesti; Rahmi Mulyasari
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 Indah Puspita; Mersi Kurniati
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.
Identifikasi Sesar dengan Menggunakan Metode Gaya Berat (Studi Kasus: Sulawesi Tengah) Rara Mutia; Mardani Mardani; Suci Fathia; Tri Kusmita
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; Tri Kusmita; Liyana Aryanto; 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.
Pembuatan Minyak Kelapa Murni (Virgin Coconut Oil) dengan Metode Fermentasi dan Optimasi Waktu Simpan dan Penjernihan Menggunakan Ekstrak Daun Lada dan Karbon Aktif Heni Pornawati; Herman Aldila; Rena Aprilianti; Dera Selviani
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.
Sintesis Teori A dan B sebagai Upaya Menjelaskan Inonsistensi Teori C dalam Proses Agitated Leaching Tailing Timah Muhammad Sahroni; Anisa Indriawati; Widodo Budi Kurniawan
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.v3i2.4125

Abstract

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.
Pemodelan Anomali Self Potential (SP) Menggunakan Algoritma MVDE (Multi Variant Differential Evolution) Muhammad Budi Haryono; Yekti Widyaningrum; Herman Aldila
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.v3i2.4162

Abstract

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.

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