IPTEK The Journal of Engineering
IPTEK The Journal of Engineering (E-ISSN: 2337-8557) is an academic journal on the issued related to engineering and technology. IPTEK The Journal of Engineering published first time in August 2014. From 2014-2018 (Volume 1-4) IPTEK The Journal of Engineering publish three issues (numbers) annually (April, August, and December). Since 2019 published annually in April and August. It is open to all scientist, researchers, education practitioners, and other scholars. Therefore this journal welcomes various topics in different engineering disciplines. Our target is to reach all universities, research centers and institutes in the globe. Call for Papers IPTEK The Journal of Engineering is an open-access journal, which means that visitors all over the world could read, download, cite, and distribute papers published in this journal for free. We adopt a peer-review model, which insured fast publishing and convenient submission. In addition to peer-reviewed original research papers, the Editorial Board welcomes original research reports, state-of-the-art reviews and communications in the broadly defined field of engineering science and technology. Theses, dissertations, research papers, and reviews are all acceptable for publication. All topics should relevant to the issues faced by industries, governments, and communities. The broad-based topics may be covered by the following knowledge areas: Computer Engineering and Information Systems (Telematics, Algorithms and Programming, Network Based Computing, Smart Computing and Vision, Intelligent Information Management, Computer Architecture and Networking, Applied Modeling and Computing, Graphics Interaction and Games, Software engineering, Information Technology Infrastructure and Security, Information Systems Management, Data Engineering and Business Intelligence, Data Acquisition and Information Dissemination, Enterprise System, and Smart Cities and Cyber Security) Civil Infrastructure Engineering (Hydrotechnics and Surveying, Construction Implementation Management, Building Materials and Structures, and Transportation and Geotechnics) Mechanical Engineering (Energy Convertion, Metallurgical and Materials Engineering, Mechanical Design, and Manufacture) Electrical Engineering Automation (Cyber Physical, Automation, and Industrial Robots, Programmable Logic Controller and Control System, Antennas and Propagation, Instrumentation, Measurement and Power System Identification, Multimedia Telecommunications Network, Multimedia Communication, Electric Energy Conversion, Electric Power System Simulation, High voltage, System and Cybernetics, Microelectronics and Embedded Systems, Biocybernetics, Instrumentation and Biomedical Signal Processing, Multimedia Computing and Machine Intelligence, and Digital Signal Processing) Chemical Engineering (Applied Chemistry, Biochemical and Bioprocess, Advance Functional Materials and Analysis, Thermodynamic, Chemical Reaction, Material and Nanocomposite, Bioenergy, Wastewater Treatment, Process Integration, Fluid Mechanic, and Sustainable Industrial Systems) Instrumentation Engineering (Control Instrumentation, Measurement Instrumentation, Photonic Engineering, Vibration and Acoustics, and Embedded Systems and Physical Cyber) Business Statistics (Business Analytic, and Quality and Productivity Engineering) And physical, chemical, biological, and environmental sciences that are directly related to engineering.
Articles
176 Documents
<![CDATA[Green Synthesis of Microcrystalline Cellulose from Cabbage Waste (Brassica Oleracea L.) Using Steam Explosion and Low-Concentration Chemical Treatment ]]>
<![CDATA[Syafira, Nesha Permata]]>;
<![CDATA[Airlangga, Bramantyo]]>;
<![CDATA[Sumarno]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 2 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[The increasing generation of agricultural waste presents both environmental challenges and opportunities for the development of sustainable materials. This study explores the extraction of microcrystalline cellulose (MCC) from cabbage waste using a combination of steam explosion and low-concentration chemical treatments to optimize lignocellulose degradation. The process involved sequential delignification with NaOH, bleaching with NaOCl, and steam explosion applied to samples that had been soaked in oxalic acid at varying concentrations (0%–2%). After drying, the samples were analyzed using FTIR, XRD, and SEM to evaluate the extracted MCC product. The analytical results showed that the applied method significantly increased cellulose purity, from 31.05% in untreated fibers to 69.88% after steam explosion following soaking in 2% oxalic acid. FTIR analysis confirmed the removal of lignin and hemicellulose, while XRD analysis indicated an increase in crystallinity from 39% to 57%, suggesting improved structural integrity. SEM analysis revealed enhanced fiber separation and reduced particle size, indicating efficient defibrillation. These results highlight the potential of an environmentally friendly approach to producing high-quality MCC, supporting green chemistry principles and sustainable development goals (SDGs). eThe extracted MCC holds promising applications, particularly as a biopolymer for drug delivery systems, polymer composites, and food additives.]]>
<![CDATA[Computational Study on Urea Concentration Profiles in Hemodialysis Hollow Fiber Membranes Under Different Blood Flow Conditions ]]>
<![CDATA[Purwanto, Belinda Kezia]]>;
<![CDATA[Rahmawati, Yeni]]>;
<![CDATA[Nurkhamidah, Siti]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 2 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[Kidney failure significantly impairs physiological functions, primarily due to the accumulation of urea in the bloodstream. When renal function drops below 75%, hemodialysis becomes a crucial therapeutic intervention. This study investigates the performance of a hollow fiber dialyzer, consisting of a shell-side dialysate flow, a semi-permeable membrane, and internal capillaries for blood flow. The main objective is to develop a theoretical model describing urea mass transfer through the membrane during hemodialysis. The analysis focuses on the effect of blood flow rate on urea concentration distribution across the tube, membrane, and shell regions in both axial and radial directions. Additionally, the influence of membrane length and dialysate flow rate on urea clearance is examined. Simulation results indicate that higher blood flow rates lead to elevated urea concentrations at the tube outlet, suggesting reduced diffusion into the dialysate compartment. In contrast, increasing membrane length enhances urea clearance. Interestingly, the dialysate flow rate shows minimal impact on clearance efficiency. Under a fixed dialysate flow rate of 500 mL/min and a membrane length of 27 cm, the calculated urea clearance values were 21.95%, 17.06%, 14.31%, and 12.52% for blood flow rates of 200, 300, 400, and 500 mL/min, respectively.]]>
<![CDATA[Effect of Inhibitor Addition, pH, and Current Density on the Corrosion Rate of Fe Metals ]]>
<![CDATA[Aulia, Anisa Fatma]]>;
<![CDATA[Faizah, Nurul]]>;
<![CDATA[Arifin, Rizal]]>;
<![CDATA[Kaloka, Ardista Izdhihar]]>;
<![CDATA[Thufailah, Gladys Sukma]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 2 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[Corrosion significantly impacts public safety and the economy, causing substantial financial losses, infrastructure damage, and hazardous incidents across various industries. Researchers investigated the effects of pH, current density, and corrosion inhibitors (potassium chromate and potassium nitrate) on iron corrosion by measuring weight loss of iron samples immersed in sulfuric acid over time. The addition of inhibitors showed that KNO3 was more effective in reducing the corrosion rate, with values of 4.992068, 3.744051, 2.736034, 1.728017, and 0.608008 mils per year, compared to K2CrO4, which resulted in 9.728132, 7.296099, 5.472066, 3.648033, and 1.216017 mils per year. Corrosion rate increased as pH decreased, with Fe showing corrosion at pH 6.21, 5.18, 4.26, 3.85, and 3.22. The relationship between current density and corrosion rate was found to be proportional, with voltage values of 1.31, 2.24, 3.16, 5.11, and 7.1 amperes per square meter (A/m^2). This study confirms that inhibitor type, acidity (pH), and current density significantly influence corrosion behavior, where increasing pH and current density can accelerate corrosion, and potassium nitrate (KNO3) demonstrates superior corrosion inhibition compared to potassium chromate (K2CrO4).]]>
<![CDATA[Implementation Of Fuzzy Logic in The Dissolved Oxygen and pH Control System to Reduce the Risk of Death of Cyprinus Carpio Fish ]]>
<![CDATA[Setyabudi, Jinan Elvaretta Aqilah]]>;
<![CDATA[Aisyah, Putri Yeni]]>;
<![CDATA[Fitriyanah, Dwi Nur]]>;
<![CDATA[Radhy, Ahmad]]>;
<![CDATA[Pratama, I Putu Eka Widya]]>;
<![CDATA[Wiratama, Maulana Andra]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 2 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[Cultivation of Cyprinus carpio, commonly known as the goldfish, in aquariums requires strict monitoring of water quality to maintain the fish's health and ensure its survival. Key parameters such as dissolved oxygen and pH greatly affect the aquatic environment, where imbalances can lead to stress or death. This study aims to design and implement a dissolved oxygen and pH control system using fuzzy logic as an alternative to traditional PID-based or rule-based systems commonly used in aquaculture. The proposed system automatically detects water conditions (LOW, NORMAL, HIGH) and activates appropriate control responses. It integrates an SEN0237 dissolved oxygen sensor, an E-201C pH sensor, aerators, dosing pumps, and an Arduino-based microcontroller. Sensor data is processed via fuzzy inference to operate actuators—either to increase oxygen levels or inject buffer solutions for pH normalization. Unlike previous studies that focus on single-parameter control or fixed-response systems, this system offers a dual-parameter adaptive control approach. Experimental validation shows that the system maintains pH at 6–7 and DO at 3–4 mg/L, with sensor accuracy exceeding 95%. Over 10 days, fish survival improved in the controlled aquarium (7/10) compared to the uncontrolled aquarium (5/10). The system demonstrates potential to reduce water quality fluctuations, offering hope for a more stable aquaculture environment. This work contributes to the application of fuzzy logic in small-scale innovative aquaculture systems, highlighting its potential advantages over conventional methods.]]>
<![CDATA[Comparative Risk Prioritization in the Initiation Phase of the Pagerungan Besar Photovoltaic Plant: A Failure Mode and Effect Analysis (FMEA) and Risk Matrix Approach ]]>
<![CDATA[Retnaningtias, Agustina Dwi]]>;
<![CDATA[Ahyudanari, Ervina]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 2 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[Photovoltaic (PV) power plant projects in East Java often face challenges during the initiation phase due to inadequate risk assessments. This phase is crucial for ensuring the project's long-term success; however, suboptimal risk identification has caused project delays. In the risk assessment process, high-priority risks need to be mitigated, but differences in the methods used can result in varying risk priority outcomes. One of the methods that can be used is Failure Mode and Effect Analysis (FMEA), while according to internal regulations at PT PLN (Persero), the Risk Matrix is applied. By using these two methods, the differences in the resulting risk priority rankings can be identified. Both tools rely on evaluations from experts experienced in decision-making during the initiation phase of PV power plant projects. From the analysis, 12 risks were identified during the initiation phase of the Pagerungan Besar PV power plant project. The highest-priority risks identified include Suboptimal feasibility study (Risk Priority Number/RPN: 74.27), unfavorable outcomes for the organization/company (RPN: 68.96), lack of budget (RPN: 64.00), and stakeholder Intervention (RPN: 53.69). Meanwhile, by plotting the Severity Level and Occurrence Level of each risk on the Risk Matrix according to PT PLN (Persero) regulations, the highest-priority risks identified include Suboptimal feasibility study (Extreme Risk Level, Zone E5), location-related issues (Extreme Risk Level, Zone E5), non-compliance with regulations (Extreme Risk Level, Zone E5), and suboptimal project team (Very High Risk Level, Zone D5). The two risk assessment methods produced different prioritizations, potentially impacting mitigation strategy decisions. This variation highlights the need for further analysis to ensure accurate and reliable risk prioritization, which is critical for project success and efficient resource allocation. Future studies should focus on evaluating prioritization methods to support effective decision-making and ensure timely project implementation in line with the targeted Commercial Operation Date (COD).]]>
<![CDATA[Risk Evaluation Of The Shipyard Supply Chain Process On Ship Repair With The House Of Risk Matrix Method ]]>
<![CDATA[Firmansyah, Hanif Ardhio]]>;
<![CDATA[Baroroh, Intan]]>;
<![CDATA[Azhar, Ali]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 2 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[One of the keys to the success of ship repair is the supply chain (SC) process of materials that arrive on time. However, delays in its implementation were still found due to poor SC risk management. The purpose of the study is to identify risk factors for SC delay, measure risk factors and evaluate risk factors. This study uses the HOR (House of Risk) method which identifies risk variables (risk events and risk agents) and designs mitigation actions. The results of the HOR phase 1 study show an assessment score in the form of Aggregate Risk potential (ARP) which has a high influence on KM repair. Lintas Damai 1 includes: Supplier's unpreparedness in fulfilling orders with a score of 225, the forwarder experienced a delay in scoring 116 and Needs rejuvenation of facilities and transportation with a score of 120 and KM. Shinpo19 includes the quality of materials from suppliers that are of poor quality with a score of 280, materials that are difficult to obtain in the area with a score of 138 and the layout of poorly organized storage warehouses with a score of 92. The results of HOR phase II include mitigation actions to handle risk agents in KM. Lintas Damai 1 includes finding trusted supplier partners, increasing networking with other suppliers, holding tenders with suppliers who are ready and conducting service and checks every month. Meanwhile, KM. Shinpo19 has mitigation actions to handle risk agents, namely replacing materials with the same specifications but still of quality, having supplier connections with quality standards, supervising suppliers so that they comply with quality standards and structuring materials based on their type.]]>
<![CDATA[The Effect of Build Orientation on Liquid Absorption and Wear of 3D-Printed Denture Materials ]]>
<![CDATA[Ikhlas, Muhammad]]>;
<![CDATA[Cahyono, Sukmaji Indro]]>;
<![CDATA[Prayoga, Benidiktus Tulung]]>;
<![CDATA[Dharmastiti, Rini]]>;
<![CDATA[Arifvianto, Budi]]>;
<![CDATA[Mahardika, Muslim]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 1 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[Up till now, denture has been widely used for resolving dental problems, especially those due to attrition. The attrition of tooth enamel could lead to wear and lowering the functions of normal teeth. So far, denture is made conventionally by using heat curing method in a mold. However, the complex geometries of teeth and oral cavity has led to the use of the more advanced techniques, such as additive manufacturing. In this research, the denture material fabricated by using digital light processing (DLP) additive manufacturing was studied in term of their liquid absorption capability and wear behavior. The specimen was printed with three build orientations, namely 0°/180°, 90°/90°, and 45°/135°. These are the degree between printing direction against sliding direction. An immersion and wear test were carried out in artificial saliva liquid. The result showed the lowest weight gain and dimensional change in the specimens printed with 90°/90° and 45°/135°. Meanwhile, the specimens prepared with build orientation of 0°/180° or printed with layer parallel to sliding direction demonstrated the smallest value of wear factor, indicating a better wear resistance compared to the others. A visual examination of the worn surface indicated delamination, abrasion and cracking as the possible wear mechanisms of the printed denture materials.]]>
<![CDATA[Compressive Strength Performance of High-Volume Fly Ash Concrete with CaCO3 Addition ]]>
<![CDATA[Wibowo, Yosi Noviari]]>;
<![CDATA[Tatas]]>;
<![CDATA[Tajunnisa, Yuyun]]>;
<![CDATA[Mawardi, Amalia Firdaus]]>;
<![CDATA[Zanah, Miftaqul]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 1 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[This study investigates the compressive strength performance of High-Volume Fly Ash (HVFA) concrete with added CaCO3 as a sustainable alternative to Ordinary Portland Cement (OPC) for infrastructure applications. The experimental research replaces a significant portion of cement with fly ash—a byproduct of coal combustion—aiming to reduce greenhouse gas emissions associated with concrete production. Two HVFA concrete mixtures were developed, substituting 37 percent and 47 percent of cement content with fly ash and adding 3 percent CaCO3 to enhance mechanical properties. Material characterization, including XRF and XRD analysis, confirmed the suitability of fly ash for concrete production based on ASTM C618-19 standards. Aggregate gradation, moisture content, and specific gravity tests were conducted to optimize the mix design. Compressive strength tests were performed at 7, 14, and 28 days, showing that HVFA concrete with 37 percent fly ash substitution achieved higher strength values, reaching 25.92 megapascals at 28 days, compared to the 47 percent mix, which reached 24.68 megapascals. Slump tests indicated sufficient workability, with a measured slump of 10 centimeters for FA37C3 and 12 centimeters for FA47C3. These findings suggest that HVFA concrete with moderate fly ash substitution, complemented by CaCO3 addition, can achieve compressive strength and workability comparable to OPC, supporting the development of environmentally friendly concrete solutions.]]>
<![CDATA[Effect of Flow Rate NaOH on CO2 Absorption Efficiency Using a Column Tray Absorber ]]>
<![CDATA[Arifin, Rizal]]>;
<![CDATA[Faizah, Nurul]]>;
<![CDATA[Kaloka, Ardista Izdhihar]]>;
<![CDATA[Aulia, Anisa Fatma]]>;
<![CDATA[Thufailah, Gladys Sukma]]>;
<![CDATA[Syukur, Muhammad Adnan]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 1 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[CO2 in industrial gas streams reduces process efficiency, corrodes equipment, and affects product quality. Additionally, CO2 emissions contribute to climate change and global warming. To mitigate these effects, CO2 removal through absorption is essential. Absorption involves contacting a gas mixture with a liquid absorbent to dissolve the gas component. This study examines the effect of CO2 flow rate (V) and NaOH flow rate (L) on CO2 absorption efficiency. The experiment involved preparing 33 liters of 0.1 normal NaOH and 250 milliliters of 0.1 normal HCl, followed by solution standardization using methyl orange. CO2 was introduced through valve V-4 while NaOH was pumped into the absorption column. Samples were taken after steady state was reached, and titration with 0.1 normal HCl determined residual NaOH concentration. Flow rate variations of 1, 3, 5, 7, and 9 liters per minute were tested. Results align with literature, indicating that as CO2 flow rate increases, NaOH flow rate also rises. However, the L/V ratio and absorbed CO2 amount decrease due to reduced contact time, lowering absorption efficiency. This study highlights the importance of optimizing flow rates to enhance CO2 capture.]]>
<![CDATA[Numerical Analisys of Segmental Box Girder’s Stress with Eccentric Tendon Anchoring on Balanced Cantilever Box Girder Bridge ]]>
<![CDATA[Raenaldo, Kevin]]>;
<![CDATA[Darmawan, M. Sigit]]>;
<![CDATA[Husin, Nur Ahmad]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 11 No. 1 (2025) ]]>
Publisher : <![CDATA[Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember. ]]>
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<![CDATA[Diagonal crack damage on the web of balanced cantilever box girder bridges has frequently occurred worldwide, including in Indonesia. Previous studies have shown that these cracks can result from additional shear stress caused by prestressed tendon anchoring. In this study, an analysis was conducted using a 2D element model verified through a numerical approach. The evaluation of box girder web stress values was used to assess the potential for cracking and confirm the results of crack mapping conducted on site. The research found that shear stress from prestressed tendon anchoring increases the total shear stress on the box girder web by up to 46.6% of the total shear stress value. The distribution of shear stress from prestressed tendon anchoring is concentrated in the anchoring areas on the top slab and bottom slab sides of the box girder web. The evaluation of principal tensile stress shows that the observed crack locations in the field correspond to areas where the principal tensile stress values exceed the allowable design limit.]]>
