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Aceh International Journal of Science and Technology
Published by Universitas Syiah Kuala
ISSN : 20889860     EISSN : 25032348     DOI : http://10.13170/aijst
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences
Aceh International Journal of Science & Technology (AIJST) is published by the Graduate School of Syiah Kuala University (PPs Unsyiah) and the Indonesian Soil Science Association (Himpunan Ilmu Tanah Indonesia, Komda Aceh). It is devoted to identifying, mapping, understanding, and interpreting new trends and patterns in science & technology development, especially within Asian countries as well as other parts of the world. The journal endeavors to highlight science & technology development from different perspectives. The aim is to promote broader dissemination of the results of scholarly endeavors into a broader subject of knowledge and practices and to establish effective communication among academic and research institutions, policymakers, government agencies, and persons concerned with the complex issue of science & technology development. The Journal is a peer-reviewed journal. The acceptance decision is made based upon an independent review process supported by rigorous processes and provides constructive and prompt evaluations of submitted manuscripts, ensuring that only intellectual and scholarly work of the greatest contribution and highest significance is published. The AIJST publishes original conceptual and research papers, review papers, technical reports, case studies, management reports, book reviews, research notes, and commentaries. It will occasionally come out with special issues devoted to important topics concerning science & technology development issues. Scopes Starting in 2016, AIJST has focused on science and engineering aspects, and therefore now AIJST considers the topics but not limited to : Engineering (Mechanical, Chemical, Civil, Transportation) Geology and Geomorphology Environmental Science (Hydrology, Pollution, Water Treatment, Soil Science, Climatology) Physical Oceanography Mathematics Physics and Geophysics Geospatial and Information Technology
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Global dan Perubahan Planet
Articles 354 Documents
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Variations in Site Conditions and Blast Geometry on The Formation of Toxic Gas (Fumes) in Open-Pit Coal Mining Hartami, Pantjanita Novi; Maulana, Yuga; Purwiyono, Taat Tri; Tuheteru, Edy Jamal; Marmer, Handoyo
Aceh International Journal of Science and Technology Vol 13, No 1 (2024): April 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.1.39211

Abstract

The blasting activity generates one of the effects in the form of toxic gases (fumes) that can disturb living beings around them. Fumes formation is formed by the reaction of the explosive material not in a zero oxygen balance condition, and is influenced by several factors including the condition of the blast hole, rock moisture content, blast hole temperature and relative humidity, sleep blast, explosive material ratio, and poor confinement stemming. This study investigates the variations in site condition and blast geometry on the formation fumes in open-pit coal mining. This research was conducted at the coal mine of Kaltim Prima Coal (PT KPC) to quantitatively measure the levels of toxic gas (fumes) resulting from blasting activities. In-situ measurements were conducted using a gas detector suspended above a drone. From the measurement results, it was found that blasting activities at the PT KPC coal mine produce CO and NO2 gases in toxic gas visual conditions at Levels 0 and 1A. The CO gas levels resulting from blasting activities ranged from 60.34 to 324.79 ppm, and the NO2 gas levels ranged from 0.3 to 2.11 ppm. From the trial results, by altering the explosive material ratio, toxic gas visual conditions were observed at Level 2A with CO gas levels of 360.29 ppm and NO2 gas levels of 3.16 ppm. The formation of CO and NO2 gases from blasting is influenced by the blast hole temperature and humidity, as well as differences in explosive material ratios. Based on the gas CO and NO2 level measurements, according to the threshold values with the maximum exposure level for humans over a 15-minute period for both gases, it was determined that workers could safely return to the blasting site in less than 1 minute.
Implementation of Deterministic and Multimineral Method in Petrophysical Analysis for Identifying Low Resistivity Reservoir in Tesla Field, Air Benakat Formation, South Sumatera Basin Saroji, Sudarmaji; Trihapsari, Wandia Mellani; Trisna, Muhammad Destrayuda
Aceh International Journal of Science and Technology Vol 13, No 3 (2024): December 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.3.36698

Abstract

The Tesla field is located in the South Sumatra Basin, where there is the Air Benakat Formation, with the constituent rocks being dominated by alternating sandstone and claystone so that it is a shaly sand environment with the potential to become a low-resistivity hydrocarbon reservoir. Hydrocarbon reservoirs generally have a resistivity log value of more than 10 m; when a hydrocarbon reservoir has a low-resistivity value between 0.5 - 5 m, it is referred to as a low-resistivity hydrocarbon reservoir. Initially, deterministic analysis was carried out to calculate the petrophysical parameters of the potentially low-resistivity reservoirs. However, the results show a low validation value of petrophysics parameters, such as effective porosity and water saturation, when compared to the DST data, so a multimineral analysis is carried out to increase the validation value of the petrophysical parameters. The use of the multimineral method has produced the petrophysics parameter closer to DST Data when compared to the petrophysics parameter produced by the deterministic method in Tesla Field. The formation analysis shows that the low resistivity reservoir in the Tesla Field is caused by the grain size of the sandstone, which is very fine so that it can bind water significantly (irreducible water), abundant shale content, and distributed by lamination of shale, dispersed shale, and structural shale as well as the presence of conductive glauconite minerals.
Optimizing Mechanical Properties of Al6063 Aluminum Alloy through Silicon Weight Percent Variation and Heat Treatment at the Propeller Shaft Materials Casting Joni, Joni; Bhiftime, Eka Irianto
Aceh International Journal of Science and Technology Vol 13, No 3 (2024): December 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.3.37662

Abstract

Ship propulsion relies significantly on the efficiency of its components, with the shaft propeller playing a pivotal role in navigating vessels through water. Traditionally constructed from steel, this study explores an unconventional approach by employing an Aluminum Alloy base material, specifically the 6063 alloy, for the propeller shaft model. The material's mechanical properties become a crucial focus, prompting a detailed investigation into the impact of silicon and magnesium elements through a meticulous heat treatment process. The experimental procedure involves heating the Al6063 alloy to 790C, transitioning to a completely liquid state, and subsequently incorporating silicon and magnesium at specific temperatures. The stirring process, executed with a mechanical stirrer, sets the stage for the alloy's casting into a mold under pressure. Post-casting, the propeller shaft undergoes a comprehensive heat treatment regimen, including solution treatment, quenching, and artificial aging. The study's findings showcase a remarkable reduction in porosity with increasing silicon elements, reaching its lowest point at 4% wt Silicon. Tensile tests demonstrate a direct correlation between silicon addition and increased stress values, with the highest stress observed at 4% wt Silicon. Concurrently, hardness values ascend proportionally with silicon inclusion, peaking at 4% wt Silicon. The thorough analysis presented here highlights the effectiveness of silicon elements in enhancing the mechanical characteristics of the shaft propeller made of aluminum alloy, which bodes well for future developments in ship propulsion technology.
Marine Debris of Northern Aceh Waters During First Monsoon Transition Period Agustina, Sri; Karina, Sofyatuddin; Purnawan, Syahrul; Ondara, Koko
Aceh International Journal of Science and Technology Vol 13, No 3 (2024): December 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.3.34234

Abstract

Pollution in the ocean caused by anthropogenic activities has been a global issue. However, data on marine debris in Aceh Waters is limited. This study was conducted to identify the category, density, and source of marine debris on the Weh Island and Aceh Island beaches during the first monsoon transition period. Samples were collected in April 2022 at four stations, namely Laweung Beach in Sumatra Island (station 1), Aron Beach in Weh Island (Station 2), Nipah Beach and Alue Riyeung Beach in Aceh Island (Station 3 and Station 4, respectively). Samples collected in a 100 m-length transect were classified into nine categories: plastic, foamed plastic, cloth, glass and ceramic, metal, paper and cupboard, rubber, wood, and others. The result depicted that the highest density was plastic (0.602-1.022 items/m2), followed by foamed plastic (0.038 to 0.654 items/m2) and rubber (0.020 to 0.089 items/m2). Turning to its appliances, plastic was mostly used as packaging, such as bottles and cups for drinking water, while foamed plastic and rubber were used for cooling boxes and footwear. As the sea current shifted during the monsoon transition period, trash from ships passing the marine routes around the Aceh Waters is assumed to be transporting debris from various countries, such as Malaysia, Thailand, and China.
Phosphate Removal from Aqueous Solutions using Activated Carbon Derived from Nypa fruticans Amelia, Marysha; Abdullah, Faisal; Muslim, Abrar; Meilina, Hesti; Saiful, Saiful
Aceh International Journal of Science and Technology Vol 13, No 3 (2024): December 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.2.42587

Abstract

Nypa fruticans (NF) waste which includes the empty fruit bunches and shells (NFW), frond (NFF) and leaflets (NFL) composes primarily of hemicellulose, cellulose and lignin, shows great potential as a raw material for activated carbon (AC). This study investigated the removal of phosphate from aqueous solutions using activated carbon derived from Nypa fruticans. The NFW, NFF and NFL was pyrolyzed and physically activated in a tube furnace. FTIR analysis revealed that the NFW-AC, NFF-AC and NFL-AC exhibited functional groups such as chemical functional group O-H, C-O-C, C-O, C=O, C-O and C-H stretching in hemicellulose, cellulose and lignin, which were associated with phosphate (PO4) adsorption. Among these, the NFW-AC showed the lowest transmittance and higher pore density. Adsorption experiments indicated a rapid initial adsorption within the first 5 min, followed by minimal changes until equilibrium was reached at 30 min. The NFW-AC showed the best performance with the highest efficiency (40.05%) and capacity (85.85 mg/g). Adsorption kinetics for all activated carbon were better described by the pseudo-second-order model, with highest capacities of 60.606 mg/g and adsorption rates of 0.0235 g/mgmin attributed to NFW-AC. The adsorption isotherms followed the Langmuir mode, yielding capacities of 60.606 mg/g, 31.546 mg/g and 8.1967 mg/g for the NFW-AC, NFF-AC, and NFL-AC, respectively. These findings demonstrated the potential of Nypa fruticans-based activated carbon for phosphate adsorption
Interaction of Growth Pole and Shannons Entropy in Banda Aceh City Fadhly, Noer; Rusdi, Muhammad; Bulba, Alfa Taras
Aceh International Journal of Science and Technology Vol 13, No 2 (2024): August 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.2.34999

Abstract

The development of growth poles, urban activity centers, and service centers in Banda Aceh City has impacted the spread, a complex urban phenomenon challenging to measure due to urban sprawl. The increasing need for space in urban areas drives the development of suburban and random areas (urban sprawl). This is evident from the BPS Banda Aceh City data for 2024, where the population increased by 25.61% post-tsunami, affecting the density of each sub-district in Banda Aceh City. Research using Shannons Entropy Method and the Gravitational Model is necessary to prevent uneven growth in the city of Banda Aceh. The application of Shannons Entropy method in Banda Aceh City from 2010 to 2020 can be seen in the Relative Entropy Matrix, which shows that the linear spread pattern (Quadrant C) is more dominant in the districts of Banda Raya, Baiturrahman, Kuta Raja, Kuta Alam, Lueng Bata, and Syiah Kuala. The urban spread pattern of Banda Aceh tends to move towards the East, largely due to the landform factors that are very suitable for being developed into built-up areas. Meanwhile, the results of the gravity analysis show that the area of interaction with the most substantial interaction value as the growth pole is the interaction between Kuta Alam District and Baiturrahman District, with a value of 190,617,812.346 interactions. The results of identifying the factors influencing the development of urban sprawl, such as the distance to the CBD, the GRDP of Banda Aceh City, changes in land use, housing demand, and the availability of infrastructure facilities in the districts of Banda Aceh City, can be concluded that there is an influence of urban sprawl on the spatial structure and regional patterns in Banda Aceh City.
The Identification of River Flow Capacity using the HEC-RAS 1D Model: Case Study of Sringin River Downstreamdy of the Sringin River Downstream Ikhwanudin, .; Afifah, Risdiana Cholifatul; Husodo, Ibnu Toto; Yudaningrum, Farida
Aceh International Journal of Science and Technology Vol 13, No 2 (2024): August 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.2.40174

Abstract

The Sringin is a downstream river located in East Semarang. The Sringin River becomes the channel waste of the East Semarang district area. The Sringin River bank is surrounded by the Terboyo industrial area and settlement. The flood occurred in both areas, especially at Ngilir village, Genuk subdistrict. It is caused by low-capacity sedimentation channels and buildings occupying the channel body. The study aims to estimate flood discharge during repeat period 2, 5, 10, 25, 50, and 100 years on Sringin river downstream, analyze the capacity cross-section river, and identify the river water level profile when debit flowed with various period repeat flood. The hydrology calculation showed that flood discharge plans in the repeat period 2, 5, 10, 25, 50, and 100 years are 12.42; 16.67; 19.81; 30.7; 31.6; 33.22 m 3 /s. At the same time, the flow river capacity is 2.95 m/s in the upstream section and 15.52 m/s in the downstream section. Thus, floods occurred in some places when large discharges flowed. In period 2, the water level is about 1.0 to 1.5 meters. In more repeat periods, the level is higher. The conclusion is that the Sringin River cannot flow with perfect discharge, which exceeds its flow capacity.
Microplastics in Landfill Environments: Distribution, Characteristics, and Risks from Gampong Jawa, Indonesia Silvia, Ika; Saiful, Saiful; Ichwana, Ichwana
Aceh International Journal of Science and Technology Vol 13, No 2 (2024): August 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.2.42344

Abstract

Landfills are generally considered the ultimate solution for waste management. However, the degradation process of plastic waste in landfills causes the release of microplastic particles into the surrounding environment and threatens human health. The distribution and properties of microplastics in four environment matrices, soil, leachate, river water, and well water surrounding the landfill, are examined in this study. Sampling was conducted at the inflow and outflow areas of the leachate ponds., The soil at the top (05 cm) and bottom (520 cm), upstream and downstream surface water adjacent to the landfill, and community wells within a radius of fewer than 700 meters from the landfill. Microplastic analysis used a gradual extraction method with saturated NaCl for density separation, 30% hydrogen peroxide for organic matter degradation, and 0.05 M FeSO4 as a catalyst. Physical character identification of microplastics using a microscope showed microplastic contamination at all study sites. The results showed an abundance of microplastics was found in well water samples (808 to 979 items/L), leachate (209 to 757 items/L), surface water (6.29 to 7.2 items/L), and soil (23,340 to 23,420 items/kg). Types of microplastics found consist of fragments, fibers, films, pellets, foam, and rods. The size of microplastics found ranged from 1.897 m to 1,642.79 m. Fourier Transform Infrared spectroscopy examination identified polyethylene terephthalate (PET) plastic compounds in soil and leachate materials. The high concentration of microplastics in well water indicates potential groundwater contamination from landfill activities that may impact the surrounding community. This study provides preliminary insights into how landfills may contribute to environmental microplastic contamination. It paves the way for further research to develop mitigation strategies.
Diazo Red B Dye Removal by Electrocoagulation Method using Aluminum Electrode Emriadi, Emriadi; Refinel, Refinel; Khalishah, Salwa
Aceh International Journal of Science and Technology Vol 13, No 2 (2024): August 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.2.41243

Abstract

The removal of diazo red B dye was studied in water using the electrocoagulation method with an aluminum electrode. The study aimed to reduce the presence of harmful diazo red B dyes in the environment and their impact on living organisms. This study was conducted by testing various parameters with specified values. The initial dye concentrations were set at 10, 20, 30, 40, and 50 mg/L, while the electrocoagulation times were varied at 30, 60, 90, 120, 150, and 180 minutes. The initial pH levels were adjusted to 5, 6, 7, and 8. The applied voltages were 2.5, 5, 7.5, 12.5 V, and the distances between electrodes varied at 1, 1.25, 1.5, 1.75, and 2 cm. The study also examined the effects of initial dye concentration on electrocoagulation time, its interaction with pH, and the influence of pH on electrocoagulation time. These parameters aim to determine the optimum conditions for diazo red B removal, as measured by a UV-Vis spectrophotometer at a wavelength of 420 nm. The optimum removal efficiency of diazo red B was achieved with 94.32% for an initial dye concentration of 30 mg/L, 94.13% for an electrocoagulation time of 180 minutes, 96.00% at a pH of 6, 95.32% for a voltage of 7.5 V, and 95,75% for an electrode distance of 1.5 cm. Additionally, the efficiencies were 99.5% for concentration relative to time was 99.5%, for concentration relative to pH was 97.85%, and for pH relative to time was 96.00%. Additionally, the coagulant analysis of the electrocoagulation results was carried out using FTIR and morphological analysis of the surface of the damaged aluminum anode using an optical microscope.
Recycling of Disposable Face Mask: Experimental Studies on Different Types of Polymer Mixture Widiastuti, Indah; Wijayanto, Danar Susilo; Nabila, Urfan
Aceh International Journal of Science and Technology Vol 13, No 2 (2024): August 2024
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.13.2.41228

Abstract

The COVID-19 pandemic has caused significant impacts on the environment since the use of disposable face masks leads to the accumulation of plastic waste. In this study, a two-step extrusion and injection molding was performed to manufacture polymer blends consisting of 80% used face mask and 20% fraction of one of these recycled polymer mixtures: polypropylene (PP), high-density polyethylene (HDPE), and PET. ASTM D256 standard was used to evaluate the mechanical properties of the resulting polymer blend materials, while the physical performance was assessed by analyzing the shrinkage. It was found that adding other polymeric mixtures could not enhance the mechanical properties of pure disposable face masks, as measured by the impact strength. However, incorporating the recycled polymer into the face mask mixture is revealed to decrease shrinkage. Observation of the morphology surface of the fracture impact specimen using a Scanning Electron Microscope (SEM) confirmed the less miscibility within the recycled polymer/face mask. The blend, which contains recycled PET, showed the lowest percentage of shrinkage. Taking advantage of its recyclability characteristic, this current work may provide an alternative approach for using the disposable face mask in low load-bearing applications.

Page 30 of 36 | Total Record : 354

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