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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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Analysis of The Effect of Changes in Thickness and Infill Density of Thermoplastic Polyurethane and Polyethylene Terephthalate Glycol Materials as a Radiological Phantom Yunianto, Mohtar; Cari, Cari; Sari, Arum Putri Kurnia
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.13.2.40201

Abstract

Phantoms are used to research image quality and the amount of attenuation as an organ simulation. If done in the human body, it would be hazardous. High radiation exposure can damage cells. Therefore, the phantom is made to resemble the properties and characteristics of a tissue so that the absorbed dose value can be analyzed according to the tissue in the organ. One use of 3D printing technology is in making phantoms. Radiology phantoms must have the same characteristics as human body tissue. This research varies the thickness and infill density of the phantom to get the suitable phantom based on material density, CT number, electron density, and effective dose. The materials used are Thermoplastic Polyurethane (TPU) and Polyethylene Terephthalate Glycol (PETG) with thickness variations of 1 cm, 2 cm, 3 cm, 4 cm, and 5 cm, and infill density variations of 20%, 40%, 60%, 80% and 100 %. Based on the test parameters carried out, it was found that changes in thickness did not affect the material density, EDG, EDV, and Z eff of the sample. However, changes in thickness are proportional to the CT number and electron density values. Meanwhile, changes in infill density are proportional to changes in material density values, CT number, electron density, and EDV. However, changes in infill density do not affect the EDG and Z eff values. The values obtained for each parameter are compared with the reference organ. Samples made from TPU and PETG are suitable for lung, muscle, soft tissue, and spongy bone.
Exploring Applications of Lagranges Equations in Technology: A Systematic Literature Review Damayanti, Fitria Siska; Noviana, RA Sania; Lestari, Yora Inda; Akhsan, Hamdi; Ismet, Ismet
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.13.2.39380

Abstract

Lagrange's equation is a formula in analytical mechanics used to solve problems with physical system dynamics. It allows mathematical modeling to simplify complex mechanical problems by changing the coordinate system, thus providing a deeper understanding of motion. In this research, a literature study was conducted using the Systemic Literature Review (SLR) method from 30 data sources, 24 of which were indexed by Scopus. A total of 11 articles have been reviewed with a focus on the application of Lagrange's equation in various technologies. The review results show that Lagrange multipliers provide a powerful tool for optimizing energy flow within complex smart grids. The benefits extend beyond smart grids. Lagrange's equations are a powerful mathematical tool applicable to various engineering challenges that involve finding optimal solutions under constraints.
Pressure Drop Analysis of Turbine Housing Model with Circular Sliced Pipe for Micro Hydropower Generation Abduh, Moh; Orfa, Lourina Evanale; Sulianto, Sulianto; Iqbal, Khairul
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.13.2.37998

Abstract

Energy independence is a government program aiming to meet society's energy needs evenly. Steps to increase energy independence in the new and renewable energy sector include hydro-energy generation. One of the important components of a hydro generator is the penstock pipe and turbine housing, which channels water and then pushes and drives (spins) the turbine with the flow of water to produce electrical energy. The turbine housing flow design innovation must provide a function as an optimal fluid conductor by minimizing the resistance that occurs when fluid flows towards the turbine housing and rotates the turbine optimally. The scope of this research includes analysis of the phenomenon of energy loss flowing in circular pipe slices in hydroelectric power plant turbine housings with influencing factors such as friction, turbulence, and flow resistance, as well as measuring the pressure drop in circular pipe slices. The model developed is a circular slice bend with angles of 180 degrees, 270 degrees, 360 degrees, and 450 degrees, taking into account the optimal curvature ratio (R/D) of 3.5. Based on previous research, 90-degree wedge bends with many slices (n_(90-degree)) 4 to 6 or 4 and pressure drop coefficient (C_(pd-th)) obtained 180-degree (0.333 0.200), 270-degree (0.445 0.277), 360-degree (0.527 0.339), 450-degree (0.587 0.390) with a bend length L, an elevation reduction angle and a 1.5D upstream-downstream elevation difference to avoid contact between the upstream and downstream bends. The results obtained from this research are the slice modules that can be used and the resistance coefficient values that arise from the slice modules. The more slices selected according to the angle of inclination chosen, the smoother the resulting circular bend shape and the lower the resistance value, but the work will be more difficult. The most optimal slice module is the number of slices that allow its implementation, and the resistance coefficient is small. By knowing the optimal resistance coefficient value, the resulting pressure drop can be predicted to maximize the thrust to rotate the turbine.
Cocoa Bean Cleaner and Dryer Device: A Microcontroller Experiment Hersyah*, Mohammad Hafiz; Yolanda, Desta; Fatma, Nela
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.22708

Abstract

Cleaning and drying cocoa beans are generally done manually by farmers. The manual cleaning process takes a long time, and the pulp reduction is not optimal. In contrast, drying using sunlight takes a long time when it is done in the rainy season. This causes the cocoa beans to be moldy and have low sale value. In the equipment made by the factory, the two machines are made separately and are hardly affordable by the farmers. Based on these problems, a microcontroller-based cocoa bean dryer (de pulper) was designed with a single container so that both processes could be carried out using just one machine. To elaborate this system, cleaning is carried out on fermented cocoa beans that are pulp shed in a rotating cylinder. In comparison, the drying process is carried out by using a heat source, a soil moisture sensor to detect the moisture content of cocoa beans, a DS18B20 sensor to detect temperatures in the drying container, and a cylindrical container is rotated using an A.C. motor. Based on the experiment results, it takes 10 minutes to clean the cocoa beans from the pulp. The drying process takes 5 hours, 10 minutes, and 5 hours and 40 minutes to dry the cocoa beans to a maximum moisture content of 7%. A rotating drying container can speed up the drying process of cocoa beans compared to drying using sunlight in the rainy season. The proposed tool in this study can carry out more efficient capacity better than the conventional tool.
Lead and Cadmium Ions Mitigation in Soil using Calcium Carbide Waste-Carbonised Lophira Alata Sawdust Composite (CCW-CLAS) as Immobilizing Agent Moses*, Okponmwense; Asekhame, Queen Omone
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.26836

Abstract

Soil contamination with heavy metals is a global environmental matter of interest due to its thinkable dangers to humans, environmental health, and the ecosystem preceding shortfalls in agricultural produce and dangerous health outcomes as they penetrate the food chain. This study aimed to mitigate lead and cadmium ions contaminant in soil using calcium carbide waste-carbonized lophira alata sawdust composite (CCW-CLAS). Contaminated soil samples were collected from Evbareke spare parts market, Benin City, Edo state Nigeria, using a grid sampling method at a depth of 0-20cm with a soil auger. 50% W/W of the powdered calcium carbide waste and lophira alata sawdust was placed in a ceramic crucible, put into a muffle furnace, and heated at 350oC for 3 hours. The X-ray diffraction analysis for the calcium carbide wastecarbonized lophira alata sawdust composite (CCW-CLAS) revealed that it was made up of predominantly calcite fraction (55.0%), portlandite (25.0%), coesite (7.3%), muscovite (6.7%), dolomite (4.0%) and lime (2.1%) this was supported by FTIR analysis. SEM analysis revealed that calcium carbide waste-carbonized lophira alata sawdust composite (CCW-CLAS) possesses a rough surface with a pore of varied size and irregular shape. The contaminated soil from the Evbareke spare parts market was heavily polluted with petroleum hydrocarbons, and the soil was highly saline with low C.E.C. The soil texture was loamy sand; as the amount of CCW-CLAS increased in the soil, the amount of cadmium and lead ions that was releasable in the soil reduced, indicating that CCW-CLAS was effective in immobilizing cadmium and lead ions. The optimum amount of the amender in the contaminated soil to immobilize lead ion was 4% w/w, and cadmium ion was 2%.
Behaviour Analysis of Strengthened-RC Beam with Natural Fiber Reinforced Polymer (NFRP) based on Abaca Fiber by Using Finite Element Method Saidi, Taufiq; Hasan, Muttaqin; Amalia*, Zahra; Iqbal, Muhammad
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.26520

Abstract

Synthetic fiber reinforced polymer (FRP) as an alternative composite material has been widely used for strengthening and repairing reinforced concrete structures. However, applying synthetic FRP materials is expensive and may be unsafe for the environment. Therefore, natural fiber reinforced polymer (NFRP) is the best alternative FRP, especially in increasing the shear strength of reinforced concrete beams. It has good tensile strength and also is environmentally friendly. Technological developments in the field of computing make modeling various aspects easier. One of them is modeling reinforced concrete (RC) beams. In this study, the ATENA V534 software was used to evaluate the results of the research and testing behavior of reinforced concrete beams. Behavior is evaluated in the form of load and deflection, the pattern of cracks and failure, and stress and strain of reinforcements. The numerical results obtained in ATENA V534 showed good agreement with experimental results. The maximum load of the four beams, namely BN, BSTV1, BSTV2, and BSTD1, based on the finite element method analysis results using ATENA V534 are 25,89 tons, 27,53 tons, 28,14 tons, and 26,92 tons, respectively. In contrast, the maximum load obtained from experimental results are 26,79 tons, 29,40 tons, 29,45 tons, and 27,14, respectively. The difference in crack angle in the beam between ATENA V534 and the experimental result is around 2. The results of numerical analysis using ATENA V534 show a lower maximum load value, higher stiffness, and lower deflection at maximum load compared to experimental results on all reinforced concrete beams analyzed in this study.
Experimental Evaluation of Workability Compressive Strength and Freeze-Thaw Durability of Concrete Containing Expanded Clay Aggregates Bensalem, Sara; Khouadjia*, Mohamed Lyes Kamel; Abdou, Kamel; Belkadi, Ahmed Abderraouf; Kessal, Oussama
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.25028

Abstract

The development of the building materials industry in Algeria and worldwide has opened up new commercial opportunities for waste recovery. Using recycled materials and natural resources such as expanded clay aggregates are increasingly seen as a solution for the future to meet the gap between production, consumption, and environmental protection. The present study investigates the effect of expanded clay aggregate (ECA) on a concrete slump, porosity, softening coefficient, compressive strength, and Freeze-thaw durability. Tests were conducted according to Russian National State Standard (GOST) 10060-2012 of concrete mixtures with expanded clay aggregate (ECA). A total of 7 mixtures were prepared. One is considered a reference mixture based on limestone aggregates. The other six mixtures were prepared by replacing the limestone aggregates with expanded clay aggregates, using two substitution rates (15%, 30% by weight) and three aggregates sizes (Sand 0/4, Gravel 8/16, and 16/25) while maintaining the same w/b ratio. The results indicate that ECAs can be used for concrete production. Furthermore, concrete containing 30% ECA (0/4) has the best properties and is the most freeze-thaw resistant than the other mixtures with ECA.
Tensile Strength of Natural Fiber in Different Types of Matrix Saidi, Taufiq; Hasan, Muttaqin; Amalia*, Zahra
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.26175

Abstract

In recent years, product-based products with low environmental impact have become one of the considerations in the construction structure. The attention of researchers toward the development of natural materials has been increasing. The use of natural fibers as composite materials for the strengthened structure has been studied. However, natural fibers are influenced by their hydrophilic nature and specific morphology. Thus, research on natural fiber composite materials still needs to be explored. This study evaluates the tensile strength of natural fiber composite materials based on the type of fiber, fiber layer used, and resin type according to ASTM D3039. The highest tensile strength was found in the epoxy resinbased matrix composite with three layers of abacaa fiber (SAAE-LP3) by 111.45 MPa. The results show that the type of fiber, fiber layer used, and resin in the composite matrix considerably affect its tensile strength performance.
Supply Chain Risk Mapping at ABC Cement Plant in Aceh, Indonesia Lufika*, Raihan Dara; Sastra, Hasan Yudie; Sentia, Prima Denny; Ilyas, Ilyas; Iskandar, Iskandar
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.23457

Abstract

Supply Chain Risk Management is an industry collaboration that works with partners in the supply chain system to implement a risk management process in dealing with the emergence of risks and uncertainties caused by logistics activities or other resources in the supply chain. Every industry deals with risk. This study aims to identify, classify, and map supply chain activities and their risks. In the initial stage, supply chain events are identified through interviews and brainstorming. Then, these events are portrayed in the supply chain map. Then, the risk identification stage used a rating scale to determine the level of likelihood and consequence based on three SCOR elements. There are 40 risk events in this study which are 13 risk events in the source section, 19 risk events in the make section, and eight risk events in the delivery section. Finally, it is necessary to calculate the value of the Risk Priority Index. The Risk Priority Index is the basis of the risk mapping stage. The risk map shows the urgency to treat each risk event.
Proton Exchange Membrane Fuel Cell (PEMFC) and Its Prospect for Powering Automobile in the Future: A Review Nashira*, Alimatun; Asyifa, Soniya Nur; Yosida, Riski Sindi
Aceh International Journal of Science and Technology Vol 11, No 2 (2022): August 2022
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.11.2.24592

Abstract

Increasing responsibility toward the environment forced the transportation sector to shift its gear toward electric vehicles. While battery electric vehicle (BEV) has started enjoying success, it poses a question as to whether or not fuel cell vehicle (FCV) becomes redundant even before being widely deployed. The commercialization of FCV usually only comes after a long period after the prototype was introduced, signifying certain barriers to large-scale utilization. Aside from the various LCAs, studies have also tried to estimate the future cost and model FCV adoption. Due to the limited data and different regional conditions in which the project was done, these researches used vastly different scenarios and assumptions, making the result differ significantly. The lack of a clear-cut answer might indicate that the fate of FCV is not yet decided, and the PEMFC might still play a part in the green transportation era, albeit not as the dominant technology. Alternative uses and the condition required to utilize them were discussed in this short review.

Page 31 of 36 | Total Record : 354

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