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INDONESIA
Science and Technology Indonesia
Published by Universitas Sriwijaya
ISSN : 25804405     EISSN : 25804391     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Physics
An international Peer-review journal in the field of science and technology published by The Indonesian Science and Technology Society. Science and Technology Indonesia is a member of Crossref with DOI prefix number: 10.26554/sti. Science and Technology Indonesia publishes quarterly (January, April, July, October). Science and Technology Indonesia is an international scholarly journal on the field of science and technology aimed to publish a high-quality scientific paper including original research papers, reviews, short communication, and technical notes. This journal welcomes the submission of articles that covers a typical subject of natural science and technology such as: > Chemistry > Biology > Physics > Marine Science > Pharmacy > Chemical Engineering > Environmental Science and Engineering > Computational Engineering > Biotechnology Journal Commencement: October 2016
Arjuna Subject : -
Articles 551 Documents
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Spectroscopic Diagnostics of Spectral Lines Emission from Cu Plasma within the Visible Spectrum Range Hayim Ch. Magid; Bushra Khamas Abbas; Dunia F. T. AL-Ani
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.710-715

Abstract

The creation and characterization of laser-induced plasma (LIP), a significant phenomenon in several applications, are influenced by the sample’s physical qualities as well as the laser’s parameters. In this research, we created Cu plasma in the atmosphere using an Nd: YAG laser operating at a wavelength of 532 nm with a laser irradiance energy range (400-800) mJ. The effect of the laser’s irradiance energy on the plasma characteristics was investigated using optical emission spectroscopy (OES). Using the two ratio and Stark broadening methods, we successfully measured the two most important plasma properties (electron temperature and electron density). The electron’s plasma temperature value ranged from 2.3 to 3 eV. The value of electron plasma density is in the range from 6.75×1017 to 15×1017 cm−3. Also, we found that other plasma parameters like plasma frequency (fp), particles in the Debye sphere (ND), and Debye length (?D) are affected by laser energy. Where plasma frequency ranged from 7.378 to 10.998×1012 Hz, the Debye sphere ranged from 7.294 to 7.022×103, and the range of Debye length from 1.372 to 1.038×10−5 cm.
Emerging Strategies for Mitigating Acid Mine Drainage Formation and Environmental Impacts: A Comprehensive Review of Recent Advances Yudha Gusti Wibowo; Muhammad Fauzul Imron; Setyo Budi Kurniawan; Bimastyaji Surya Ramadan; Tarmizi Taher; Alvian Hayu Sudibya; Hutwan Syarifuddin; Khairurrijal Khairurrijal; Jarwinda
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.516-541

Abstract

Acid mine drainage (AMD) is a significant threat to the environment due to its high acidity and metal ion content. To effectively eliminate pollutants from AMD, various approaches are necessary. This review aims to provide a comprehensive understanding of recent advances in AMD mitigation. While treatment technologies have developed to eliminate AMD, they often produce sludge as a by-product and require expensive maintenance. As a cost-effective alternative, the recovery of AMD resources can reduce toxicity and promote reuse of heavy metals and rare earth elements. This review also analyzes the challenges and prospects of AMD mitigation implementation, including current mitigation conditions and knowledge gaps. Researchers can benefit from this review by gaining insight into research progress in this area, identifying strengths and weaknesses of current AMD mitigation applications, and exploring future research directions.
Preparation and Characterization of Fe2O3 from Iron Sand of the Coastal Sea of Cidaun Beach-South Cianjur (Indonesia) using the Co-precipitation Method Endah Puspita; Masno Ginting; Ramlan
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.594-598

Abstract

The synthesis and characterization of Fe2O3 from Iron Sand of the coastal sea of Cidaun Beach - South Cianjur using the coprecipitation method has been carried out. The purpose of this research was to identify the crystal structure, magnetic mineral content, and magnetic properties of iron sands. The characterizations used in this research are X-Ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). Based on the XRD results, it shows that the iron sand sample produces multi-phases, namely hematite (????-Fe2O3), maghemite (????-Fe2O3) and ilmenite (FeTiO3). SEM-EDX results indicate that the iron sand samples have an average particle size of 12.396 ????m. VSM results indicate that the iron sand sample is soft magnetic (ferrimagnetic) with saturation, remanence and coercivity values of 47 emu/g, 1.53 emu/g and 102.97 Oe, respectively.
Towards Sustainable City: A Covering Model for Recycling Facility Location-allocation in Nilai, Malaysia Zati Aqmar Zaharudin; Adibah Shuib; Rieske Hadianti; Zahari Md Rodzi
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.570-578

Abstract

Sustainable waste management is essential for any nation. To limit the amount of waste transported to landfills, it is critical to handle waste properly, notably by segregating recyclables from discarded waste. Waste separation at the source is critical to ensure that generated waste is not completely directed to landfill. The practice of waste separation would initiate the recycling process, which is able to reduce the amount of waste sent to the landfill. Recycling is critical to the achievement of two Sustainable Development Goals (SDGs), 11 and 12, for which Malaysian government has set the goal for recycling rates to reach 40% by 2025 in 2022, the rate has reached 33.17%. In Malaysia, recyclables are either collected on-site or sent to a designated facility. The separation at source activity is essential for developing recycling practices. Despite being the largest waste generator, public engagement, particularly at the household level, has remained low, most likely due to recycling facility availability and accessibility issues. Thus, improving public access to the facility would lead to increased recycling rates. In this study, a mixed integer linear programming model is proposed to locate recycling facilities in optimal locations that cover the most amount of waste generated by households. The capacity level is induced to ensure that the dropped-off recyclables are proportionate at the designated facility locations. Several experiments were conducted for validity purposes, and the proposed model was applied in a Malaysian urban area, namely Nilai. As a result, the proposed model was able to locate the optimal locations with the requisite capacity level while ensuring coverage for most Nilai households.
Extreme Drought Assessment in Sumatra-Indonesia Using SPI and EDI Suhadi; Iskhaq Iskandar; Supari; Muhammad Irfan; Hamdi Akhsan
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.691-700

Abstract

Even though Sumatra is very vulnerable to the effects of drought, research identifying drought on this island is very limited, especially extreme drought. This research was conducted to identify extreme drought in Sumatra using the Standardized Precipitation Index (SPI) and the Effective Drought Index (EDI). This study uses precipitation data from the Indonesian Meteorology, Climatology and Geophysics Agency (BMKG) and Global Precipitation Climatology Center (GPCC) reanalysis data. The composite indices were conducted to discover some phenomena that cause the drought based on El Niño and positive Indian Ocean Dipole (IOD) events. The results showed that the El Niño and positive IOD phenomena were more likely to influence extreme droughts. However, the droughts in 2014 and 2008 tended to be influenced by the negative Sea Surface Temperature anomaly (SSTA). The spatial analysis results show that the areas that experience extreme drought more often are the west coast of Sumatra (except Aceh province), especially based on SPI12 and EDI. The composite indices results show that the drought that occurred in Aceh province was more influenced by the El Niño phenomenon in the December-January-February (DJF) period and the positive IOD in the June-July-August (JJA) – September-October-November (SON) period. In addition, Aceh province is an area that is not affected by El Niño-positive IOD, especially during the SON-DJF period. These results can be used to mitigate drought, especially when El Niño-positive IOD phenomena cause it.
Antioxidant Activity Test of the Ethyl Acetate Fraction of Beluntas Leaves (Pluchea indica L.) in White Male Rats Wistar Strain Induced Carbon Tetra Chloride Fitrya; Vitri Agustiarini; Adelia Indriyan; Herlina; Dwi Hardestyariki; Eka Febri Zulissetiana
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.599-606

Abstract

Beluntas leaves contain flavonoids which have antioxidant effects. The purpose of this research was to determine the flavonoid total content, the effect of ethyl acetate fraction of beluntas on Malondialdehyde (MDA) levels, catalase enzyme activity, macroscopic pathology, histopathology description of white male rats wistar strain induced by CCl4 and of determining the best dose antioxidant. In this study, the in vivo tests used TBARS methods which consisted of six groups that are normal control, positive control (vitamin C 10 mg/kgBW), negative control (Na-CMC 1%), and treatment groups were given ethyl acetate fraction of beluntas leaves at doses 25 mg/kgBW, 50 mg/kgBW and 100 mg/kgBW. The total flavonoid content of the ethyl acetate fraction of beluntas leaves was 153 mgQE/g. The average results of MDA levels normal, positive, negative, doses fraction groups of 25, 50, and 100 mg/kgBW, respectively, were 1.155; 0.471; 1.892; 1.218; 0.826 and 0.512 nmol/mL. The average results of catalase enzyme activity of normal, positive, negative, doses fraction groups 25, 50, and 100 mg/kgBW, respectively, were 22.131; 40.489; 3.103; 14.145; 32.176, and 39.814 U/mL. The macroscopic and histopathology results show an improvement after being given the ethyl acetate fraction of beluntas leaves at doses of 25, 50, and 100 mg/kgBW compared to the negative control. The results showed that the ethyl acetate fraction of beluntas leaves reduce MDA levels and increases catalase enzyme activity. Ethyl acetate fraction of beluntas leaves at 100 mg/kgBW had the most potent antioxidant activity compared to doses of 25 and 50 mg/kgBB which were shown by Duncan’s statistical analysis that there was no significant difference with positive control.
Secondary Metabolite of Endophytic Fungi Daldinia eschscholtzii from The Leaves of Syzygium polyanthum Mia Tirta Sari; Hary Widjajanti; Ferlinahayati; Hermansyah; Rian Oktiansyah; Elfita
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.560-569

Abstract

Salam (Syzygium polyanthum) is a plant that is often used by Indonesian people as traditional medicine. The leaves are consumed to treat various diseases. This study reports the endophytic fungi found from S. polyanthum leaves and its secondary metabolites. Endophytic fungi species were determined through morphological and molecular identification. Potato Dextrose Broth medium was used for the cultivation process and ethyl acetate was used as a solvent for the extraction process. Antioxidant tests was carried out by using the DPPH method. Chromatographic techniques were used for the isolation of secondary metabolite and spectroscopic analysis was carried out to identify their chemical structures. The results of morphological and molecular analysis showed that the sample was Daldinia eschscholtzii. The secondary metabolite obtained from this endophytic fungus was idetified as fonsecinone A with good antioxidant activity. The secondary metabolite have the potential to become a source antioxidants through further research.
Green Synthesis of KO Nanoparticles by Cold Plasma and Study of Their Properties for Antibacterial Applications Mohammed Jawad Kadhim; Rana Ismael Khaleel; Karar Mahdi Talib; Raghad S. Mohammed
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.579-584

Abstract

This study used the cold plasma technique to synthesize potassium oxide nanoparticles (KO NPs) from potassium chloride (KCl) with roselle extract leaves and examine their physical and biological characterization. The physical properties of KO nanoparticles were examined by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), X-Ray Dispersive Spectroscopy (EDS), and UV–Vis Spectroscopy. Analyses of XRD show the KO NPs with an average crystallite size of 108 nm. The EDX analysis shows that high-purity KO NPs have formed. SEM image shows the shapes of some KO NPs’ spherical with varying sizes ranging from 44.66 nm to 134 nm. According to UV–Vis spectra of KO NPs, the absorption edge of these nanoparticles exhibited a blueshift with an energy gap range (Eg) from 2.8 to 3.4 eV. The biological efficacy of KO NPs was also examined by testing their antibacterial and antifungal activity. To evaluate the toxicity of the KO NPs were tested in vitro and activated as antibacterial. Against some of the test organisms, the KO NPs demonstrated good antibacterial activity.
Colorimetric Sensing of Ascorbic Acid Using Cu-Phen MOFs and Subsequent Digital Image Analysis with Smartphone M. Lutfi Firdaus; Rizki M. Okumura; Euis Nursaadah; Dewi Handayani; Afrizal Mayub; Lena Rahmidar; Muhamad Diki Permana; Annisa Luthfiah; Santhy Wyantuti; Diana R. Eddy; Yeni Wahyuni Hartati
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.660-665

Abstract

Vitamin C, also known as ascorbic acid, is a crucial nutrient involved in a number of enzymatic processes for tissue healing. Additionally serving as an antioxidant, ascorbic acid is crucial for keeping the immune system strong. It is essential to create a quantitative analytical approach to ascertain ascorbic acid concentration in many samples since its consumption from the daily food should be in the proper quantity. Here, we present a colorimetric probe made of synthetic metal-organic frameworks (MOFs) that changes its color only when samples containing ascorbic acid are present. In this study, phenanthroline served as an organic ligand or linker while copper served as the core metal that formed bonds with it. Cu-Phen MOF color fluctuations at 410 nm (from 408 nm to 412 nm) are linearly related to variations in light absorption. Moreover, as a substitute for spectrophotometry UV-visible, we have created a digital image-based colorimetry. The Cu-Phen MOFs’ color change has the maximum slope and linearity when the blue color intensity is used. The detection limit with high precision of 4.2% under ideal circumstances was 0.1 ppm. The established approach allowed for the exact and accurate assessment of ascorbic acid in genuine samples of star fruit (Averrhoa carambola L.).
Optimal Conditions for Alkaline Delignification Process in Cellulose Isolation from Sengon Wood Sawdust Intan Martha Cahyani; Adhyatmika; Endang Lukitaningsih; Teuku Nanda Saifullah Sulaiman
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.666-674

Abstract

Sengon wood sawdust (SWS) is a solid waste of the wood industry with the potential as a source of cellulose and can increase its economic value. However, cellulose in plants is tightly bound to lignin which is called lignocellulose therefore needs to be delignified before utilization. In this study, we determined the optimum conditions for delignification from sengon wood sawdust cellulose (SWSC). Optimization variables were determined with the parameter of obtained hemicellulose, cellulose, and lignin content. The optimization of SWSC delignification was then carried out using the factorial design by analyzing the effect of sodium hydroxide (NaOH) concentration (2% - 10%) and ratio (SWS : NaOH solution) (1:10 – 1:80) on hemicellulose, cellulose, and lignin content. Optimal conditions were obtained at 2% NaOH (1:19.20) with concentrations of 8.01% hemicellulose, 52.49% cellulose, and 22.2% lignin. One sample T-test analysis of predictive and research values of hemicellulose, cellulose, and lignin showed insignificant results (P>0.05) which means that the optimization equation proved valid to determine the optimum conditions for cellulose delignification of sengon wood sawdust. FT-IR analysis, SEM imaging, and particle size distribution (PSA profile) showed that the cellulose produced under these conditions has similar characteristics to the standard of Avicel® PH 102.

Page 29 of 56 | Total Record : 551

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