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.
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<![CDATA[Pengolahan Limbah Tambak Udang Terintegrasi Kultivasi Mikroalga dari Kawasan Pertambangan ]]>
<![CDATA[Deviany Deviany]]>;
<![CDATA[Triya Yuli Andini]]>;
<![CDATA[Aji Hafiz Talaga]]>;
<![CDATA[Andri Sanjaya]]>;
<![CDATA[Feerzet Achmad]]>;
<![CDATA[Dennis Farina Nury]]>;
<![CDATA[Desi Riana Saputri]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.9275
<![CDATA[Microalgae have a high lipid content, making them a potential feedstock for biofuel production. In this study, microalgae isolated from the Tanggamus mining area was cultivated in liquid medium from shrimp aquaculture waste. The main objectives were to examine the growth of microalgae in shrimp aquaculture waste specifically in liquid waste, sediment waste, and a combination of both to assess whether these waste types can serve as effective cultivation media, and to evaluate the microalgae's adaptability as well as its role in mitigating environmental pollution. The microalgae were cultivated in the three different waste mediums, and the results were compared to a control medium using walne. The findings revealed that shrimp aquaculture sediment supported the highest biomass production, reaching 17.80 mg/L. The mixed media yielded 15.93 mg/L, while the walne control and liquid waste media produced 9.00 mg/L and 3.87 mg/L, respectively. Furthermore, post-cultivation analysis revealed an increase in nutrient concentrations, including nitrogen, phosphorus, and potassium, in the cultivation medium. The microalgae strain reduced BOD in shrimp aquaculture waste, especially in sediment. COD in liquid waste increased due to complex compounds and cell lysis. Lipid extraction from the microalgal biomass highlighting its potential as a feedstock for biodiesel production. These results suggest that shrimp aquaculture waste, particularly its sediment component, not only serves as a suitable medium for cultivating microalgae, but also contributes to environmentally sustainable practices by helping reduce aquatic pollution and promoting waste-to-resource conversion.]]>
<![CDATA[Techno-Economic Analysis of Fuel Switching from Coal to Natural Gas for NPK Fertilizer Drying Process ]]>
<![CDATA[Rizal Arifin]]>;
<![CDATA[Devi Intan Silviani]]>;
<![CDATA[Rakhma Ayu Giarti]]>;
<![CDATA[Daril Ridho Zuchrillah]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.9573
<![CDATA[Using coal as the primary fuel in the NPK fertilizer industry contributes significantly to carbon dioxide (CO₂) emissions, which negatively impact the environment and hinder the achievement of national decarbonization targets. To address this, this project aims to evaluate the technical and economic feasibility of switching from coal to natural gas in the furnace unit of the NPK fertilizer production process. As demands for efficiency and sustainability increase, the evaluation of fuel switching to natural gas is underway. This project re-simulates the combustion process in the furnace using Aspen Plus V14. Evaluation is carried out on thermal performance, CO₂ emissions, and economic indicators, including Capital Expenditure, Operational Expenditure, NPV, IRR, and Payback Period. The results show that natural gas achieves a thermal efficiency of 90.11%, reduces CO₂ emissions by 27.5% compared to coal, and yields a favorable economic value: NPV of $76,009.13, IRR of 32%, and Payback Period of 3 years. Based on these results, natural gas is considered a balanced fuel option from technical, environmental, and economic perspectives. It is feasible to implement as an energy transition strategy in the NPK fertilizer industry.]]>
<![CDATA[Impact of Rotational Speed and Oxygen Flow Rate on Homogeneity and Fluid Flow Patterns Using a CFD-Based Side Entry Mixer in the Aeration Process ]]>
<![CDATA[Danawati Hari Prajitno]]>;
<![CDATA[Ardista Izdhihar Kaloka]]>;
<![CDATA[Hikmal Akbar H]]>;
<![CDATA[Nuriya Shifa A]]>;
<![CDATA[Vania Salma Fuadiyah]]>;
<![CDATA[Happy Riezqya Dzunnurain]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.9680
<![CDATA[Mixing is an essential operation in many industrial processes to ensure uniform material distribution and enhance mass transfer. A side-entry mixer (SEM) is widely used in large storage tanks because it provides effective circulation with lower installation and maintenance costs than conventional top-entry mixers. This study investigated the effects of impeller rotational speed and oxygen flow rate on the homogeneity and flow patterns of a calcium carbonate (CaCO₃)–water suspension during the aeration process. Computational Fluid Dynamics (CFD) simulations using ANSYS and experimental visualization were employed to evaluate mixing performance. The operating conditions included impeller rotational speeds of 500, 600, 800, 1000, and 1200 rpm and oxygen flow rates of 5, 10, 15, 20, and 25 L/s. The results showed that increasing rotational speed and oxygen flow rate accelerated mixing and improved fluid homogeneity. The flow was dominated by axial and combined axial–radial patterns, promoting uniform circulation throughout the tank. Under the investigated conditions, the best mixing performance was achieved at 1200 rpm with oxygen flow rates of 20 and 25 L/s, reaching complete mixing within 40 s. Higher Reynolds and Sherwood numbers at these conditions also indicated enhanced turbulent mixing and mass transfer.]]>
<![CDATA[Impact of Rotational Speed and Impeller Types on Flow Patterns and Mixing Time in a Side-Entry Dual Mixer: A Study Using CFD and Visual Methods ]]>
<![CDATA[Ardista Izdhihar Kaloka]]>;
<![CDATA[Shendi Haris Firmansyah]]>;
<![CDATA[Marsyada Maghfirotul Wafiroh]]>;
<![CDATA[Ni’mah Wati]]>;
<![CDATA[Icha Nur Prayadi]]>;
<![CDATA[Danawati Hari Prajitno]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.9682
<![CDATA[The effectiveness of industrial mixing processes is strongly influenced by impeller type and rotational speed because these parameters determine flow pattern, turbulence intensity, and fluid homogeneity. This study analyzes the effect of impeller type and rotational speed on flow pattern, mixing time, and turbulence characteristics in a side-entry dual mixer using a calcium carbonate (CaCO₃) suspension and water. The analysis was conducted using computational fluid dynamics (CFD) modeling and visual observation to identify circulation patterns and stagnant zones. Three impeller configurations were evaluated: dual four-blade propellers, four-blade pitched blade turbines (4-PBT), and a combination of both, operated at 300 and 600 rpm. The results show that impeller type significantly influences the flow pattern, while increasing rotational speed reduces mixing time. The dual 4-PBT at 600 rpm provided the best performance, characterized by multiple axial–radial circulation loops without stagnant zones and the fastest mixing time of 120 s. This configuration also produced the highest Reynolds number of 3127.19, indicating a transitional flow regime that enhances turbulence and accelerates homogenization. These results demonstrate the importance of selecting appropriate impeller types and rotational speeds to improve industrial mixing efficiency.]]>
<![CDATA[Effect of Current Density, Surfactants, and CuSO4 Concentration on Copper Electroplating of Iron Surfaces ]]>
<![CDATA[Anisa Fatma Aulia]]>;
<![CDATA[Nurul Faizah]]>;
<![CDATA[Gladys Sukma Thufailah]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.9683
<![CDATA[Corrosion poses a serious threat to various industries, leading to financial burdens and infrastructure deterioration. This research investigates the influence of current density, surfactants, and CuSO₄ concentration on the electroplating process of copper onto iron surfaces. Current densities of 0.069825, 0.078069, 0.082062, 0.096939, and 0.129863 A in⁻², boric acid surfactant concentrations of 0.6, 0.9, 1.2, 1.5, and 1.8 g, and CuSO₄ concentrations of 0.40, 0.45, 0.50, 0.55, and 0.60 N were analyzed to assess their effects on the quality of the deposited copper layer. For each condition the deposited layer was evaluated through changes in specimen thickness and mass and through an extrapolated corrosion rate (mils per year, mpy) of the copper anode. Increasing current generally raised the amount of deposited copper, but the relationship with thickness, mass, and corrosion rate was non-monotonic rather than strictly increasing, indicating that current alone does not control coating quality. Adding boric acid buffer promoted a smoother deposit and, at the highest addition (1.8 g), coincided with the lowest measured anodic corrosion rate; excessive amounts, however, are undesirable on adhesion and toxicity grounds. Within the range tested, a moderate CuSO₄ concentration gave the most uniform deposition. Because corrosion rates were extrapolated to an annual basis from very short (5 min) tests, the absolute mpy values should be read as relative comparisons only. The results underline the need to tune, rather than simply maximise, electroplating parameters to obtain a high-quality copper coating on iron.]]>
<![CDATA[Seakeeping of Recycled Plastic Jerry Can - Based Pontoon Floating Rigid Dock for Estuary Area Application ]]>
<![CDATA[Prabhawatya Poundra]]>;
<![CDATA[Rasional Sitepu]]>;
<![CDATA[Sinung Widiyanto]]>;
<![CDATA[Bagus Kusuma Aditya]]>;
<![CDATA[Hadi Suyanto]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.9750
<![CDATA[Floating docks provide essential infrastructure for transportation, fisheries, and community activities in estuarine environments, where fluctuating water levels and limited port facilities require stable, economical, and sustainable floating structures. This study investigates the hydrostatic characteristics and seakeeping performance of modular floating rigid dock configurations utilizing recycled 30-L high-density polyethylene (HDPE) plastic jerry cans as buoyancy modules. Three configurations, namely the Base, T-shaped, and U-shaped models, were numerically evaluated using Maxsurf Modeler and Maxsurf Motions under irregular JONSWAP wave conditions. The hydrostatic analysis revealed that the T-shaped and U-shaped configurations increased displacement by approximately 44.3% and 122.3%, respectively, compared with the Base model, while the U-shaped configuration achieved the highest transverse metacentric height (GMt = 2.144 m). Frequency-domain seakeeping analysis showed that the heave and pitch responses of all configurations remained comparable, with differences generally below 10%, indicating that changes in pontoon arrangement had minimal influence on vertical motion characteristics under moderate wave conditions. In contrast, the T-shaped configuration reduced the peak roll response amplitude operator (RAO) by approximately 23% compared with the U-shaped configuration, demonstrating improved transverse motion performance while maintaining comparable heave and pitch responses. Considering hydrostatic capacity, operational stability, structural functionality, and site adaptability, the T-shaped configuration exhibited the most balanced overall performance for estuarine floating dock applications. These findings demonstrate that recycled HDPE plastic jerry cans can serve as technically feasible, sustainable, and low-cost buoyancy modules for modular floating dock systems.]]>
<![CDATA[Designing an Information System Model for Project-Based Learning Management and E-Showcase Using a Design Thinking Approach ]]>
<![CDATA[R.R. Ardiyanti Putri Hapsari]]>;
<![CDATA[Berlian Al Kindhi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 12 No. 1 (2026) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j28075064.v12i1.10817
<![CDATA[The Department of Electrical Automation Engineering manages Project-Based Learning (PjBL) through several separate media. This condition makes it difficult for users to browse documents, monitor progress, access assessment rubrics, and publish project results. This study designs an information system model for PjBL and e-Showcase management using a Design Thinking approach. Carrying out the Empathize, Define, Ideate, Prototype, and Test stages. Then, data is collected through observations and interviews with 12 students and 4 lecturers. Processing the findings into 17 initial codes, 10 themes, 10 functional requirements, and 4 non-functional requirements. Determine the impact-effort score through discussions with developers who understand the level of difficulty of each feature. Then, an interactive prototype is created and tested on 19 users, consisting of 12 students, 4 lecturers, and 3 admins. The test resulted in 139 task implementations. Participants completed 131 tasks, or 94.2%, without instructions, and 8 tasks, or 5.8%, with general instructions regarding menu locations. The average task ease of use was 4.38 out of 5, while the System Usability Scale score was 79.61, falling into the acceptable category. The Yangyang model is designed to support document management, progress monitoring, rubric transparency, cross-semester archiving, and project publication through e-Showcase. However, the prototype still requires improvements in menu naming, button visibility, and guide search before the system is implemented.]]>
