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
160 Documents
<![CDATA[Risk Evaluation Of The Shipyard Supply Chain Process On Ship Repair With The House Of Risk Matrix Method ]]>
<![CDATA[Radi, Hanif Ardhio]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 2 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i2.a21214
<![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[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, Sumarno]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 2 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i2.a22841
<![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[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[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i2.a22948
<![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 mpy, compared to K₂CrO₄, which resulted in 9.728132, 7.296099, 5.472066, 3.648033, and 1.216017 mpy. 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 A/m². 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[Computational Study on Urea Concentration Profiles in Hemodialysis Hollow Fiber Membranes Under Different Blood Flow Conditions ]]>
<![CDATA[Purwanto, Belinda Kezia]]>;
<![CDATA[Nurkhamidah, Siti]]>;
<![CDATA[Rahmawati, Yeni]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 2 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i2.a22947
<![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[Site-Specific Seismic Hazard Assessment and Ground Motion Selection for Nonlinear Time History Analysis ]]>
<![CDATA[Safiraa, Faradina]]>;
<![CDATA[Tajunissa, Yuyun]]>;
<![CDATA[Darmawan, Muhammad Sigit]]>;
<![CDATA[Wahyudi, Hendra]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 3 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i3.a23085
<![CDATA[This journal aims to study a comprehensive methodology involving Deterministic Seismic Hazard Analysis (DSHA), site-specific ground motion selection, spectral matching, and nonlinear dynamic analysis on Beribis Kendeng Waleri Fault. Seven strong ground motion records were selected from the PEER NGA-West2 database and spectrally matched to the target response spectrum derived from DSHA parameters. Local site effects were incorporated through a site response analysis using detailed subsurface soil data, which classified the site as Class E (very soft soil). The resulting surface-level acceleration time histories were used in nonlinear time history analysis to assess structural performance.]]>
<![CDATA[DESIGN AND IMPLEMENTATION OF ELECTRICAL SISTEMS FOR BREAD DOUGH DEVELOPMENT PROOFER TECHNOLOGYS BASED ON MICROCONTROLLER WITH PID CONTROL FOR DONUT DOUGH ]]>
<![CDATA[Silviana W, Ika]]>;
<![CDATA[Hakim, Muhammad Syaiful]]>;
<![CDATA[Sampurno, Bambang]]>;
<![CDATA[Nurhadi, Hendro]]>;
<![CDATA[Mashuri, Mashuri]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 3 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i3.a23047
<![CDATA[The proofing process is an essential step in bread-making, where the dough is allowed to rest for the gas content to develop and form a soft structure. However, many small-scale bread producers still rely on manual methods for proofing, leading to unstable temperature and humidity levels and longer production times. This study focuses on developing an electrical system for a bread proofer that can stabilize temperature and humidity during the proofing process. The system includes an Arduino Mega microcontroller with a DHT22 sensor for real-time temperature and humidity detection, an I2C LCD for monitoring, and a potentiometer for setting the desired temperature and humidity values. To achieve stability, a PID control system is used. The results show that the system can stabilize at a temperature of 40.10oC and humidity at 80-90RH for approximately 38.4 minutes. This electrical system offers an effective solution for optimizing the proofing process in bread production.]]>
<![CDATA[Integrated Process Design and Economic Evaluation of Waste-to-Biomaterial Conversion: Hydroxyapatite Production from Blue Crab Shells using Aspen Plus ]]>
<![CDATA[Nugroho, Aldi Nugroho]]>;
<![CDATA[Gumelar, Tobing]]>;
<![CDATA[Aska, Silma Elvaretta]]>;
<![CDATA[Rizqiyah, Vita Fatichah]]>;
<![CDATA[Kamilah, Villia Lidzati]]>;
<![CDATA[Rosanti, Maharani Sugito]]>;
<![CDATA[Venanto, Dimas Gilang]]>;
<![CDATA[Ma'mun, Ummu Zahroh]]>;
<![CDATA[Ramadhan, Haykal Nur Fajri]]>;
<![CDATA[Ningrum, Eva Oktavia]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 3 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i3.a23060
<![CDATA[The demand for bone transplant materials is rising in Indonesia. A biogenic calcium supply for hydroxyapatite (HAp), the primary inorganic component of human bone, is provided by blue crab shells, which are produced contain 53.70–78 weight percent CaCO₃. A steady-state method for producing HAp from crab shells is developed and assessed in this study, utilizing Aspen Plus V14 in conjunction with the Aspen Process Economic Analyzer. The simulated flowsheet comprises solid–liquid separation, drying/sintering, CaO storage, CaO hydration, HAp precipitation with H₃PO₄. The global thermodynamic model chosen is the SOLIDS property approach, and stoichiometric reactions with Arrhenius-type power-law kinetics are used to simulate HAp production. In the simulation, 150.246 kg·h⁻¹ HAp, or roughly 1451.81 t·year⁻¹, is predicted for a design base of 46.48 kg·h⁻¹ CaO. A 20-year equipment lifetime, 8000 operating hours annually, a 20% rate of return, and zero-cost shells are assumed in the economic study. This results in a total capital cost of USD 1.94 million and an annual operating cost of USD 1.31 million. The findings offer a quantifiable starting point for evaluating the technical viability of waste-to-HAp systems and directing additional experimental validation, life-cycle analysis, and process improvement.]]>
<![CDATA[Modification of Paving Block Molding Machine with the Addition of an Automatic Control System Based on a Programmable Logic Controller (PLC) ]]>
<![CDATA[Safitri, Laksita Aji]]>;
<![CDATA[Darmawan, Andri]]>;
<![CDATA[Sampurno, Bambang]]>;
<![CDATA[Mashuri, Mashuri]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 3 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i3.a23052
<![CDATA[Company X is a paving block molding machine fabrication company in Surabaya. However, the machine still has some shortcomings because it is still conventional or manually operated. Some of these shortcomings, such as being still prone to human error and being less consistent when operating, can affect the results of the amount of production. From this phenomenon, automation is very important in the industrial world. Therefore, by referring to previous phenomenon, through this research, an automatic control system is made on paving block molding machine using PLC. The results showed that PLC succeeded in developing a system that works automatically on the machine. Then, the ladder diagram used several instructions, including interlock, timer, counter, and set reset according to how the machine works. Then, the PLC-based automatic control system has a shorter cycle time than the original manual machine. Cycle time has decreased by 15.4%. From this decrease in cycle time, if simulated related to production capacity, an automatic control system can increase production per hour by 300 pcs more than the manually operated machine.]]>
<![CDATA[Surface Characteristics Comparison of Machining Waste Using Powder Metallurgy Method ]]>
<![CDATA[Widianti, Ika Silviana]]>;
<![CDATA[Raharjo, Yoga Kartiko]]>;
<![CDATA[Safa'at, Ahmat]]>;
<![CDATA[Suhariyanto, Suhariyanto]]>;
<![CDATA[Nugroho, Giri]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 3 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i3.a23206
<![CDATA[Machining processes generate metal waste in the form of fine powder that is often not reused efficiently. This study explores the potential reuse of metal machining waste powder through powder metallurgy, focusing on how sintering temperature affects mechanical properties and microstructure. Metal powder from ST60 steel machining was compacted and sintered at 1100°C, 1150°C, and 1200°C. The specimens were then compared to original ST60 steel. XRF analysis confirmed that iron was the dominant element in the waste powder. Microstructural analysis showed the presence of ferrite and pearlite in all specimens, with higher sintering temperatures increasing the ferrite content. In terms of mechanical performance, ST60 steel showed the highest hardness (80.6 HRB) and compressive strength (156.157 N/mm²). Among the specimens, the one sintered at 1100°C had the highest hardness (65.1 HRB) and compressive strength (73.293 N/mm²), closest to ST60 steel. The lowest surface roughness (7.058 Ra) was observed in the 1200°C specimen, approaching ST60’s value (2.003 Ra). These findings indicate that reused machining waste powder can be processed into useful products, especially for low-load applications, with optimal properties achieved at 1100°C sintering temperature.]]>
<![CDATA[Synergistic Temperature Effect on the Acid Corrosion Inhibition of API 5L Grade B Steel Using Eichhornia crassipes Leaf Extract ]]>
<![CDATA[Safitri, Laksita Aji]]>;
<![CDATA[Kuswanto, Yusuf Tanto]]>;
<![CDATA[Husodo, Nur]]>;
<![CDATA[Widiyono, Eddy]]>;
<![CDATA[Subiyanto, Hari]]>;
<![CDATA[Kusnadi, Dimitra Meidina]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 11, No 3 (2025) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v11i3.a23162
<![CDATA[Corrosion is the deterioration of material properties, particularly metals, due to chemical reactions with the surrounding environment. One of the effective methods to mitigate corrosion is the addition of inhibitors. Organic inhibitors are considered environmentally friendly, cost-effective, and renewable. In this study, an extract of water hyacinth leaves (Eichhornia crassipes) was used as an organic inhibitor. The material tested was API 5L Grade B steel in 1 M HCl solution as the corrosive medium, with testing temperatures of 30 °C, 40 °C, 50 °C, and 60 °C, and inhibitor concentrations ranging from 500 mg to 2500 mg. The corrosion behavior was evaluated using Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS), and Weight Loss (WL) methods. The results showed a significant reduction in the corrosion rate of API 5L Grade B steel in 1 M HCl solution when the water hyacinth extract inhibitor was added. In the PDP test, the corrosion rate for the sample without inhibitor reached 107.4 mm/year, while the lowest inhibition efficiency was 1.25% and the highest inhibition efficiency was 97.85%, observed at 50 °C with an inhibitor concentration of 2500 mg. This represents the maximum efficiency among all tested concentrations and temperatures.]]>
