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All Journal Jurnal Geliga Sains: Jurnal Pendidikan Fisika Jurnal Penelitian Pendidikan IPA (JPPIPA) Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) BAREKENG: Jurnal Ilmu Matematika dan Terapan PROMINE Jambura Journal of Mathematics Kumawula: Jurnal Pengabdian Kepada Masyarakat Journal of Appropriate Technology for Community Services Stannum : Jurnal Sains dan Terapan Kimia Abimanyu: Journal of Community Engagement Inovasi Pendidikan Fisika Pekodimas : Jurnal Pengabdian Kepada Masyarakat Jurnal Riset Fisika Indonesia Dharma Pengabdian Perguruan Tinggi (DEPATI) Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics
Herman Aldila
Department Of Physics, Universitas Bangka Belitung
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Synthesis And Characterization Of Carbon-Chitosan Composite Electrodes Based On Biomass Carbon Activated Using The Microwave Method Deden Nurdandi; Herman Aldila; Widodo Budi Kurniawan
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 | Full PDF (535.264 KB) | DOI: 10.33019/jrfi.v2i2.3216

Abstract

In this research, the synthesis and characterization of chitosan modified carbon composites based on biomass carbon has been carried out using the microwave method. Chemically activated carbon with 2.5% H3PO4 activator was stirred using a magnetic stirrer for 1 hour and allowed to stand for 24 hours. The carbon was then physically reactivated using a microwave for 20 minutes with a power variation of 800, 1000 and 1200 watts and a Scanning Electron Microscopy (SEM) test was carried out. After the SEM test, chitosan modified carbon was synthesized with a composition ratio of 1:1, 2:1 and 3:1 and the specific capacitance was measured using Galvanostatic Charge-Discharge (GCD) testing. The SEM test results analyzed using ImageJ software-based image processing methods show that the value of sphericity, pore size and carbon porosity decreases with increasing microwave power used. The optimum conditions based on the value of Sphericity, pore size and porosity were obtained at a variation of 800 watts of microwave power with values ​​of 0.952, 0.832 m, and 25.87%, respectively, which were included in the macropore size (>50 nm). Because the higher the power used, the smaller the pore area and porosity. The electrode-specific capacitance values ​​were 3.4 x 10-1 F/g, 24.02 F/g, and 1.3 x 10-1 F/g, respectively. Electrodes with a ratio of 2:1 have the largest capacitance value, because they can be charged by an electric charge. The longer the charge-discharge process, the greater the capacitance value, so the curve will approach a more symmetrical isosceles triangle shape.
The Effect Of Contact Time Variations On The Efficiency Value And The Adsorption Kinetic Mechanism Of Iron (Fe) On Batik Waste Cual Using Chitosan Widodo Budi Kurniawan; Herman Aldila; Livia Livia
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 | Full PDF (391.677 KB) | DOI: 10.33019/jrfi.v2i2.3221

Abstract

English
Pemetaan Sosial Masyarakat di Pulau Semujur Kabupaten Bangka Tengah Wahri Sunanda; Luna Febriani; Herman Aldila
Pekodimas : Jurnal Pengabdian Kepada Masyarakat Vol 3, No 1 (2023): Pekodimas: Jurnal Pengabdian kepada Masyarakat
Publisher : Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Semujur Island is one of the islands in the administrative area of Central Bangka Regency, to be precise in Kebintik Village, Pangkalan Baru District. Dominantly the existing land of Semujur Island is in the form of gardens/fields and shrubs with trees that are rarely found in the east. The residential area has supporting facilities in the form of roads and docks which are concentrated on the west side of Semujur Island. The majority of residents who inhabit Semujur island come from immigrant communities (Buton, Tanjung Gunung, and Sungai Selan) which are dynamic with their main occupation as fishermen. The high level of community harmonization makes the potential for community social conflict on this island quite low. The condition of the island is still natural and the social environment where conflicts rarely occur as well as the construction of infrastructure facilities such as docks, mosques, and tourist shelters by the local government make this island suitable for use as a place for permanent residence and the development of a new tourism sector with potential. In addition, based on the measurement results of environmental parameters, it is concluded that the current quality of the waters around Semujur Island is still relatively good even though the pH level of the waters as a whole is alkaline. This allows it to be used for microalgae cultivation which is expected to open up new business opportunities so that it can improve the economic conditions of the residents and suppress the demographic dynamics of the Semujur Island community.
The Isotherm Studies of Cu (II) Adsorption in Kolong Bangka’s Water onto NaOH-Deacetylated Shrimp Shells Waste Chitin Desy Yuliana Dalimunthe; Anisa Indriawati; Endang Setyawati Hisyam; Herman Aldila
Stannum : Jurnal Sains dan Terapan Kimia Vol 5 No 1 (2023): April 2023
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v5i1.3848

Abstract

Isotherm models of Cu (II) adsorption in Kolong Bangka’s water onto NaOH-deacetylated shrimp shells waste chitin was studied. The extraction of chitin was carried out through three steps: deproteinization, demineralization and decolorization. The deacetylated shrimp shells waste chitin (DA-SW chitin) were prepared by the reaction of DA-SW chitin with NaOH at varying concentrations of 20, 40 and 60% (%W) with stirring for 1 hour at room suhue where the degree of deacetylation for varying NaOH concentrations were 65.72, 67.44 and 88.98%, respectively based on our previous research. Increasing the NaOH concentration causes the diffusion rate of OH- increase thus realizing the effectiveness of OH- attack on the carbonyl carbon group in chitin acetamide increasing so that the chitin deacetylation process becomes more effective. In order to study adsorbent equilibrium behaviour, Freundlich and Langmuir isotherm models were used based on Cu (II) adsorption data with variations in contact time 5, 10, 15, 20, 25, and 30 minutes. The results showed that the concentration of Cu (II) decreased with the increase of the degree of deacetylation and contact time. The optimum condition for the percentage of Cu (II) adsorption was achieved in DA-SW chitin with NaOH 60% (where the degree of deacetylation was 88.98%) during 30 minutes was 97.19%. The Cu (II) adsorption isotherm model in Kolong Bangka water onto DA-SW chitin is represented by the Freundlich isotherm model where the Cu (II) adsorption mechanism onto DA-SW chitin causes the formation of multilayer surface which may due to Van der Waals force.
Implementasi Model Autoregressive Integrated Moving Average pada Proyeksi Komoditas Ekspor Timah Desy Yuliana Dalimunthe; Herman Aldila
Jambura Journal of Mathematics Vol 5, No 2: August 2023
Publisher : Department of Mathematics, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjom.v5i2.18853

Abstract

The Bangka Belitung Archipelago is a potential area in the mining sector because many soils contain tin minerals and minerals that are spread evenly. Based on this phenomenon, this study uses the ARIMA model to analyze the prediction of the number of tin export commodities in the Bangka Belitung Islands Province. The time series data used in this study begins in January 2020 and ends in September 2022, with projected results ending in June 2023. Based on the analysis results, it is found that the ARIMA model (1,1,0) is the best model that can be used to project the value of tin export commodities in the Bangka Belitung Islands Province. This model was selected through the results of the correlogram test, which shows that the data is cut off at the second lag for the Autocorrelation Function (ACF) and Partial Autocorrelation Function (PACF) plots. This projection analysis was carried out after passing the stationarity test first through the Augmented Dicky Fuller (ADF) test. Through this test, it is found that the data is stationary at the first difference, and the prob value is 0.0003 with the projected result that there will be an increase in the number of exports of tin commodities with a total increase of 0.03%. The results of this analysis can certainly be part of preventive actions for the government to be able to assist the country in increasing the country’s foreign exchange through increasing export commodities.
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.
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.
Analisis b-value Gempabumi Menggunakan Metode Gutenberg-Richter Berdasarkan Estimasi Maximum Likelihood Di Daerah Sulawesi Utara Reski Maulinda; Tri Kusmita; Herman Aldila; 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
Kajian Variasi Massa Karbon Aktif dan Waktu Kontak terhadap Kinetika Adsorpsi Ion Logam Besi (Fe) pada Limbah Cair Batik Cual Rena Aprilianti; Herman Aldila; Widodo Budi Kurniawan
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.v4i2.4416

Abstract

Cual batik liquid waste discharged directly into the environment can cause environmental problems due to containing various heavy metals such as iron metal (Fe). Adsorption method is one of the efforts to reduce heavy metal content in wastewater. This study utilises activated carbon from coconut shell waste to be used as a heavy metal adsorbent. The activated carbon used is the result of physical and chemical activation processes. Based on SEM results, activated carbon has pores with a pore diameter of 81.84 µm and a surface area of 0.2315 cc/g. The adsorption process was carried out using activated activated carbon with mass variations of 0.25 grams, 1.5 grams, and 1.75 grams. Meanwhile, the contact time variations used were 0, 40, 80, 120, and 160 minutes. The results showed that the most optimum mass variation of activated carbon to absorb Fe metal was 1.5 grams with a contact time of 80 minutes which left a residual Fe metal of 0.161 ppm.
Green Synthesis Nanopartikel Karbon Aktif dari Limbah Tempurung Kelapa Rena Aprilianti; Dera Selviani; Diani Lestari; Herman Aldila
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.v4i1.4525

Abstract

Activated carbon from coconut shell waste is a porous solid that has a large surface area with high absorption capacity, making it an alternative for reducing levels of heavy metal ions in the air. Active carbon is made by carbonization and chemical activation, then SEM testing is carried out to see the morphology of the activated carbon and analyzed using ImageJ software. This research aims to determine the effect of chemical activation and no activation on the number of pores formed in activated carbon. From the results of research that has been carried out, there are more pores formed after carbon is activated compared to carbon without activation. This is because the carbon surface without activation is still covered by impurities. In addition, unactivated carbon and activated carbon from coconut shells have pore sizes that fall into the mesoporous category.
Co-Authors Anisa Indriawati Aprilianti, Rena Arsyadi, A Asmar Asmar Atin Nuryadin Deden Nurdandi Dera Selviani Dera Selviani Desy Yuliana Dalimunthe Desy Yuliana Dalimunthe Desy Yuliana Dalimunthe, Desy Yuliana Diani Lestari Endang Setyawati Hisyam Fadillah Ramadhani Fitri Afriani Heni Pornawati Indah Puspita, Indah Indriawati, Anisa Ineu Sulistiana, Ineu Julianti, Erna Latupapua, Flourenchia Charollyne Lestari, Diani Livia Livia Luna Febriani Madewi Mulyanratna Maulinda, Reski Megiyo Megiyo Megiyo Megiyo Nurdandi, Deden Permono Adi Putro Pornawati, Heni Pririzki, Sisilia Jesika Rena Aprilianti Rena Aprilianti Reski Maulinda Rika Favoria Gusa Riko Irwanto Robby Gus Mahardika Roehafi, Firza Saputra, Darman Selviani, Dera Sito Enggiwanto Syamsiar, Syamsiar Tri Kusmita Triani Triani Triani, Triani vavionita, Fenni Verry Andre Fabiani Wahri Sunanda Widodo B. Kurniawan Widodo Budi Kurniawan Widyaningrum, Yekti Yekti Widyaningrum Yekti Widyaningrum Yuant Tiandho Zundia, Zundia