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Andalasian International Journal of Applied Science, Engineering, and Technology
Published by Universitas Andalas
ISSN : -     EISSN : 27970442     DOI : https://doi.org/10.25077/aijaset
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering
The Andalasian International Journal of Applied Science, Engineering, and Technology (AIJASET) is an international journal dedicated to the improvement and dissemination of knowledge on applied science, engineering and technologies including energy, environment, industrial, agriculture, civil, transportation, Information and communication and other related sciences and engineering. AIJASET follows new trends and advanced technology for practical applications of appropriate technology.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 197 Documents
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Performance Analysis of Channel Estimation Schemes for Phase Shift Optimization: An Analysis of Bit Error Rate and Armijo Step Size Behavior Munira, Anne. N.; Njeri, Waweru
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 3 (2024): November 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i3.194

Abstract

In the recent past, there has been a growing need for ultra-low latency and high-data-rate communication. In Non-Line-of-Sight (NLoS) communication, the channel capacity and accuracy of transmission are significantly affected by interferences, lowering the Quality of Service (QoS). An intelligent Reflecting Surface (IRS) has risen as a potential solution to challenges associated with NLOS communication including low data rate, multipath fading, and high BER. However, to leverage the performance gains of the IRS, effective and highly accurate channel estimation is crucial as it facilitates optimal phase shift optimization. This work investigated the performance of four main channel estimation algorithms in an IRS-aided system; LS, DD, DFT, and MMSE in terms of their BERs and effects on the convergence behavior of the Stochastic Convex Approximation (SCA) algorithm following the Armijo rule. Results indicate that in cases without statistical knowledge of the channel, the DD method provides the best performance. This work shows that the communication needs, complexity, and accuracy should be carefully considered when selecting the channel estimation method for IRS-aided communication systems.
Evaluation of Life Cycle Costs for Agarwood Oil Extraction with Microwave and Ultrasonic-Assisted Techniques Saputra, Hendra; Satria, Benni; Nazir, Novizar; Anggraini, Tuty; Salim, Emil
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 3 (2024): November 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i3.196

Abstract

Agarwood oil extraction is a crucial process in the agarwood industry. However, this extraction is seldom performed by communities due to its lack of profitability and the extensive duration of the process. This study aims to investigate innovative techniques such as ultrasonic and microwave-assisted maceration to enhance the yield of agarwood oil extraction. Additionally, it seeks to calculate the efficiency of time and cost by determining the life cycle cost of agarwood oil extraction. The methodology employed in this study involved conducting extractions using ultrasonic-assisted maceration, microwave-assisted maceration, and a combination of ultrasonic and microwave-assisted maceration. The results indicated that the extraction method yielding the highest output utilized a combination of microwave-assisted maceration for 3 minutes and ultrasonic-assisted maceration for 60 minutes, producing a yield of 0.15%. When extrapolated to 24 hours, this method would yield 18 grams of agarwood oil extract with an additional cost of Rp13,037. In contrast, the solvent maceration process using microwaves yielded 0.096% of agarwood oil at a lower cost of Rp3,190, producing 12 grams of extract over a 24-hour extraction period. the compounds that make up the composition of agarwood oil are 2-((2S,4aR)-4a,8-Dimethyl-1,2,3,4,4a,5,6,7-octahydro-naphthalen (11.38%), Hydrocinnamic acid (11.13%), Hydrocinnamic acid (11.13%) and (3R,3aR,4aS,5R,9aS)-3,5,8-Trimethyl-3a,4,4a,5,6,7,9,9a-octahydro (10.90%).
Implementation of Fuzzy Logic to Automatic Flower Irrigation Device Using Matlab Raihan, Ismi; Daud, Muhammad; Hasibuan, Arnawan; Mardhiah, Ainal; Kerimzade, Gulschen
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.117

Abstract

Fuzzy logic is a logic that has values of fuzziness or ambiguity between true and false. Values in fuzzy logic typically range from 0 to 1. The theory of fuzzy logic is widely used for control systems in various fields. An automatic flower irrigation system is an automated watering device that can be operated with fuzzy logic. In this research, there are two main parameters: temperature and humidity. For the temperature parameter, five linguistic variables are used: cold, cool, normal, warm, and hot. Meanwhile, for soil moisture, three linguistic variables are used: dry, moist, and wet. The results of this research are the maximum setting points obtained according to the rules that have been defined. In this study, the maximum setting point is achieved with a high temperature and low humidity. The difference in output between the Mamdani and Sugeno methods is not very significant. The Mamdani method produces real number values, while the Sugeno method produces integer values. This difference is due to several factors, one of which is the difference in the use of formulas in the defuzzification process of each method.
A mixture of Aloe Vera Gel (Aloe vera. L) and Sungkai Leaf Extract (Peronema canescens. Jack) as Edible Coating to Increase Tomato (Solanum lycopersicum) Storage Life Yefrida, Yefrida; Boneta, Fella Krisna; Refilda, Refilda
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.122

Abstract

Tomatoes are climacteric fruits, are well-known for containing lycopene is an antioxidant. The post-harvest shelf life of harvested tomatoes is only 4-5 days. This research aims to optimize previous methods such the use of plastic packaging and cold storage methods were found to be inefficient and produced waste, so it is necessary to renew them by using the edible coating method, a natural ingredient from Aloe vera. L gel, while sungkai leaf extract (Peronema canescans. Jack) shows the effectiveness of edible coating could potentially provide a protective barrier against external factors, helping to maintain the quality of tomatoes and waste reduction. Edible coating material from aloe vera gel added with sungkai leaf extract of various compositions (C, EC1, EC2, EC3, EC4, and EC5) was prapare and applied to tomatoes. Fourier Transform Infrared (FTIR) testing was carried out to determine the functional groups in all edible coating materials. Physicochemical properties tests were carried out on tomatoes. The results obtained by EC5 the lowest weight loss 11.14%, while EC4 was the best edible coating material in percent decay 8.89%, total dissolved solids 1.00oBrix, total antioxidant 0.024 mg AA/g FW, and total phenolic 0.224 mg GAE/g FW for 15 days compared to aloe vera gel coating (EC1), which only lasted for 9 days, and uncoated (C), which only lasted for 6 days. Keywords: Edible coating, physicochemical properties, FTIR
Study and Analysis on The Application of Cleaner Production in The Urea Fertilizer Industry (PT X) in Sumatera Aulia, Nurul Izzah; Indrasti, Nastiti Siswi; Ismayana, Andes
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.126

Abstract

Cleaner production is an environmental management strategy that is preventive, integrated and continuously applied to every process. The urea fertilizer industry certainly produces waste and allows for problems or constraints in the processing process. This study aims to obtain a cleaner production strategy to increase the efficiency of urea production. This research was studied at a urea factory in Sumatera with a high production capacity of 114,584 kg/hour. The cleaner production strategy was preventive maintenance for the CO2 compressor (B/C 1.91), cleaning demister on dust recovery prilling tower (B/C 3.62), making automatic door closer (B/C 84,54), addition wire mesh on air exhaust (B/C 91,96), add a condensate drop container overall (B/C 1,51) and make repairs to existing dehumidifier in bulk storage (B/C 30,94). Determining the priority of cleaner production alternatives using the MPE method results in the highest priority net production alternative being making automatic doors closer. If all alternatives are implemented, there will be savings in energy consumption of 2.052 kWh/tonne/day. Percentage of urea and NH3 loss can be reduced up to 20% so that the prilling unit production efficiency increased by 0.24% and the savings to be obtained range from 620 thousand - 45 billion rupiah/year.
Hybrid Ag@Rice Leaf Biochar Nanocomposite As Photocatalyst For Efficient Degradation Of Methylene Blue And Denaturation Of Micro-Organisms Nworie, Felix; Frank, Nwabue; Meashack, Elom; Clinton, Oroke; Boniface, Oke; Nkechi, Eze; IkeAmadi, Chioma
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.134

Abstract

Organic-inorganic hybrid nanocomposite is currently in the fore front of research because it is ecofriendly, safe, cost effective, methodologically facile and effective for the removal of methylene blue (MB) from aqueous solution. In this study, hybrid Ag@rice leaf extract/rice leaf biochar nanocomposite (Ag@RLEBN) was hydrothermally fabricated for the degradation of MB and denaturation of microorganisms. To understand the mechanisms between Ag@RLEBN and MB/microorganism, the physicochemical analysis, reusability, photocatalytic degradation parameters and microbial inhibition diameter were investigated. The obtained results revealed Ag@RLEBN as face centered cubic crystalline structure with crystallite size of 27.5 nm. The band gap energy of rice leaf biochar (RLB) and Ag@RLEBN was 1.9 and 1.8 eV respectively. Photocatalytic degradation of 99.7% was obtained at initial MB concentration of 0.0001M, 5 mg of Ag@RLEBN and 60 min exposure to sunlight. The main mechanism in control of the degradation of MB was electrostatic attraction, complexation, cationic exchange, ???, n??, and hydrogen bonding. Accessing the reusability of Ag@RLEBN indicated less than 2.05% degradation efficiency disparity after five cycle reuse. The Ag@RLEBN showed high antimicrobial inhibition effectiveness against salmonella (10 nm), Klebsiella (12 nm) and staph aureus (8nm). Therefore, Ag@RLEBN is effective for the removal of MB and microbial decontamination.
Design of Multi-Level Inverter Design for Charging Stations of Electric Vehicles Htay, Aung Kyaw; Tun, Hla Myo Tun; Pradhan, Devasis; Win, Lei Lei Yin; Khin, Ei Ei; Soe, Khaing Thandar
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.136

Abstract

The paper mainly focuses on the Design of Multi-Level Inverter Design for Charging Stations of Electric Vehicles. The research challenges in this study are: the lack of technology for higher level design of multilevel inverter systems for electric vehicles (EVs) is facing to solve the high performance and robustness of the system in reality, the control algorithm for maximum power observing is a crucial challenge in the designing and implementing such kind of multilevel inverter design, the pure sine wave inverter approaches with higher number steps could be a candidate for electric vehicles (EVs) in real world applications. That problems could be solved based on the knowledge and idea of power electronic circuits and systems. The implementation of this study was accomplished based on the specific model especially based on the circuit theory and microelectronic devices. The results confirm that the performance specification of targeted multilevel inverter (MLI) in real world applications.
Analysing and Profiling the Magnetic Field Levels in 330 kV Transmission Stations Switchyard Moses, Abiodun Stephen; Ocheni, Abdullahi Ugbede Usman; Nwohu, Mark Ndubuka; Oyedum, Onyedi David
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.143

Abstract

The investigation of radiated magnetic field intensity in switchyards is of paramount important, so spot measurement procedure was used to detect the levels of magnetic field by placing the detachable sensor of Extech 480826 Triple-Axis metre on ‘constructed stand’ with three reference heights of 1.0, 1.5 and 1.8 m. Instant coordinates of position was simultaneously recorded at each spot during the process of measurements. The analysis revealed locations significant differences of p = 0.027, p = 0.016 and p = 0.023 for the respective reference heights (1.0, 1.5 and 1.8 m). Shiroro and Kainji transmission switchyards mean ELF magnetic field were significant at each height when analysed using least significant differences pairwise comparison. However, non-significant differences between Jebba with Shiroro and also Kainji transmission switchyards were noticed. Further assessment of ELF magnetic field through 2D profiling of height levels in the transmission switchyards display similar drifting path with slight differences and locations with high intensity detected from the plots. The level of instant nonuniformity in mean magnetic field distribution at the switchyards during the duration of the measurements have been revealed by this research and also irregular exposure encountered by workers across height standing at a spot exposed.
Non-destructive Analysis of Pamelo Citrus Fruit Maturity with Impedance Spectroscopy Method Rosiana, Elfirza; Baskara, Hedy Aditya; Setiawan, Jan; Ardianto, Donie Agus; Abdurahman, Abdurahman; Maulana, Riski; Yanti, Fitri
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.144

Abstract

Citrus fruit is a fruit that is favored by the public. The quality of the fruit from the garden to the consumer goes through a long process. Generally, the quality of the fruit is evaluated by a visual judgment ratio that can be wrong. This method also only evaluates the external quality of the fruit. The internal quality of the fruit such as sugar content is determined by a refractometer which belongs to the destructive method, and is not suitable for online quality measurement. A non-destructive and objective method to evaluate the quality of citrus fruits is needed. Electrical Impedance Spectroscopy (EIS) method can be used in non-destructive investigation. In this study, a non-destructive measurement of pamelo orange fruit was developed. The impedance change of pamelo citrus fruits during ripening was observed over a period of one week. The impedance of pamelo orange fruit was measured by AD5933 evaluation board and then the measurement data was analyzed by EIS Spectrum Analyzer software. Frequency-related electrical characteristics were observed, the results showed that the electrical impedance decreased and the phase increased
Design of Assistive Device For Blind People Based on Arduino Nano With Global Positioning System (GPS) Tracker Sobari, Muhammad; Putri, Fairuz Antoni; Toha, Agung Muhamad; Wulandari, Rindi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 2 (2024): July, 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i2.150

Abstract

There are many people who do not have the ability to see so they have difficulty in carrying out activities. They need the help of others to carry out their daily activities. Therefore, the purpose of this research is to create a blind assistive device based on arduino nano with Global Positioning System (GPS) tracker in order to help blind people carry out activities independently. The method used in this research is experimental method. Based on the test results, this tool is able to detect objects from the front, left, and right at a distance of 100 cm then provide voice instructions through the speaker, and this tool can send the location of its users to certain people through the GSM module (Global System for Mobile Communication). Based on the comparison of location readings between the GPS module and google maps, the location read by the GPS module can be said to be quite accurate. From the distance measurement average error value of 0-2%, so the accuracy level of the system is 98%. The performance constraints of this tool are when conditions in the room GPS module and GSM module are difficult to get a signal because it is blocked by the room.

Page 9 of 20 | Total Record : 197

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