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REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
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Articles 19 Documents
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Search results for , issue "Vol 18, No 3: Desember, 2025" : 19 Documents clear
Studi Eksperimental Pengaruh Sudut Sudu pada Turbin Pelton terhadap Performa Pembangkit Listrik Tenaga Gelombang Air Mekanisme Piston Fikri, Ach Dhaka'; Noerpamoengkas, Ardi; Ulum, Miftahul
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.27576

Abstract

Renewable energy is energy that comes from natural resources that are continuously available. Renewable energy will replace fossil fuels that will slowly run out, fossil fuels such as oil, gas and coal. Dependence on fossil fuels results in the depletion of reserves of these energy sources. One of them is a hydroelectric power plant using a Pelton turbine. The working principle of a Pelton turbine is to utilize fluid and water power to generate shaft power. The rotation of the turbine shaft will be converted by the generator into electrical power. In this study, an experiment was conducted on a piston mechanism hydroelectric power plant using a Pelton Turbine with 14 blades with variations in blade angles of 0ᵒ, 10ᵒ, and 15ᵒ with a piston mechanism. The research sought was torque, shaft rotation, mechanical power, voltage, voltage power, turbine power and efficiency. The results of this study show the effect of blade angle variations on the torque produced by the Pelton turbine at an angle of 0ᵒ producing the highest rotational torque of 17.66 Nm, while at an angle of 15ᵒ producing a rotational torque of 17.06 Nm, and the power produced by the Pelton turbine at an angle of 15ᵒ producing higher mechanical power and turbine power compared to angles of 0ᵒ and 10ᵒ, namely mechanical power of 1076.724 J/s and turbine power of 83 watts, shaft rotation of 603 Rpm, and turbine efficiency at an angle of 15ᵒ producing a value of 63%.
Effect of Waste Marble Stone Fractions in Porous Asphalt Mixtures for Quality Improvement Sa'dillah, M; Oktaviastuti, Blima; Malo, Yoskario Darman
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.29329

Abstract

Improving road transportation accessibility is essential for enhancing local social and economic activity in a country. One way to maintain the accessibility of the road network and ensure that users feel safe and comfortable is to maintain an adequate pavement surface layer throughout the duration of the network. Prolonged rain becomes one of the problems of paving the road surface. aims to achieve the following: (1) to determine the Marshall strength of the optimum asphalt content (OAC) value in the porous asphalt mixture; and (2) to determine the effect of the use of marble stone fraction waste on the characteristics of porous asphalt mixtures. Research method uses experimental research in the laboratory. Research will be conducted using the Australian Asphalt Pavement Association (AAPA) 2004 approach method. Research was conducted with Pen 60/70 asphalt content of 4%, 4.5%, 5%, 5.5%, and 6% to find the optimum asphalt content value, then it will be added with a ratio of 0%, 15%, 25%, and 35% marble fraction waste material to the total OAC weight. Results of the analysis of the Marshall characteristics of the porous asphalt mixture with a variation of 25% marble content have met the specifications on the grounds that all parameters have met the requirements of the Australian Asphalt Pavement Association (AAPA 2004) with a VIM value at 25% content of 18.61%, for a VMA value of 50.60%, while for a stability value of 508 kg and for a flow value obtained of 2.57 mm while for an MQ value of 262.46 kg/mm.
Evaluasi Kesehatan Ekosistem Mangrove Menggunakan Indeks MHI (Mangrove Health Indeks) serta Identifikasi Spesies Dominan di Pesisir Tuban dan Lamongan Prayogo, Luhur Moekti; Sudianto, Achmad
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.30475

Abstract

Mangrove ecosystems play a vital role in protecting coastlines, sequestering carbon, and sustaining coastal biodiversity. However, various pressures such as land conversion, abrasion, and human activities are causing degradation in these ecosystems. This study aims to assess the health condition of mangroves in Tuban and Lamongan Regencies through an integrative approach based on Mangrove Health Index (MHI), Normalized Difference Vegetation Index (NDVI) from Sentinel-2A images, and field data. The results of the study showed that the total area of mangroves in the two regions reached 178.88 hectares, with the dominance of medium density (56.47%) and high density (80.37%) which described relatively healthy vegetation conditions. Lamongan Regency recorded higher species diversity (10 types) than Tuban (7 types). The species found include Rhizophora mucronata, R. apiculata, R. stylosa, Avicennia marina, A. officinalis, A. alba, Bruguiera gymnorrhiza, Ceriops tagal, Aegiceras corniculatum, and Sonneratia alba. NDVI analysis showed a positive correlation with MHI, with the eastern Lamongan area and central Tuban as healthy mangrove zones. These findings reinforce the relevance of the use of remote sensing data in coastal ecosystem mapping, but still require field validation for ecological accuracy. This study recommends the integration of spatial approaches with community-based rehabilitation policies to strengthen the sustainability of mangrove management.
Optimisasi Rute Penyelamatan Robot Mobil dalam Labirin: Algoritma Pencarian Jalur Terpendek Wahyuni, Sri; Fuad, Muhammad; Umam, Khanif Khoirul; Sya’diyah, Lailatus; Laksono, Deni Tri
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.23810

Abstract

An area where a fire occurs is generally covered in smoke, hot air and dangerous for firefighters to enter. Robotics technology, especially mobile robots, makes it possible to be used as a rescuer to replace the role of the firefighter team. The task of the rescue mobile robot is to thoroughly explore the area and then on the next iteration, the mobile robot is able to find the shortest path by eliminating paths that lead to dead ends. The robot's ability to map and choose the shortest path is the goal of this research. The path is a black line intersecting at a 90° angle. The method applied to achieve the objectives in this research is the maze mapping algorithm left hand rule. The maze solving algorithm left hand rule method was chosen as a solution to plan the shortest path in a maze-shaped environment by creating codes such as L (Left), S (Straigh) and U (Dead End). After the codes were compiled from the mapping process, the code was simplified so that the robot could find a way out of the maze with the shortest path. The success rate was 90%, out of ten tests using the maze mapping left hand rule method, resulting in nine successes and one failure. The fastest mapping time was 23 seconds and the average was 62 seconds, while the shortest time was 8 seconds and the average was 27 seconds.
Digital Modern Financial Systems In The Perspective of Cyber Risk Management : A Structural Equation Modelling Approach Lisnawaty, Lisnawaty; Mujanah, Siti; Fianto, Achmad Yanu Alif
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.31765

Abstract

The rapid digitalization of financial systems has amplified exposure to cyber risks, posing substantial threats to institutional performance and systemic stability. This study investigates how Cyber Risk Management (CRM) strengthens Financial System Resilience (FSR), both directly and indirectly, through Regulatory Compliance (RC) and Technological Safeguards (TS). Using Structural Equation Modelling (SEM) with simulated survey data (n = 200), the findings reveal that CRM has a strong direct effect on FSR (β = 0.41, p 0.001) and significant indirect effects via RC (β = 0.07, 95% CI [0.02–0.12]) and TS (β = 0.14, 95% CI [0.08–0.20]). The overall model demonstrates robust explanatory power (R² = 0.65), confirming that 65% of financial system resilience is explained by CRM, RC, and TS. These results validate a multi-layered framework in which governance, compliance, and technology jointly enhance systemic resilience. The study contributes theoretically by integrating cyber risk management with resilience theory, and practically by offering a model for policymakers and financial institutions to design more adaptive, secure, and technology-driven financial ecosystems in the digital era. 
Studi Komparasi Parameter Lingkungan Proses Produksi Garam di Indonesia Fauziyah, Lailatul; Yulitasari, Fara’idhya Intan; Maulana, Ilham; Camila, Aysyah Fitria; Efendy, Makhfud; Nuzula, Nike Ika; Pratiwi, Wiwit Sri Werdi
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.28434

Abstract

Indonesia has great potential as a salt-producing country due to its extensive coastline and favorable geographical conditions. However, the quality and quantity of domestic salt production are still suboptimal and fail to meet the domestic industrial salt demand. This study aims to analyze and compare environmental parameters that influence the suitability of salt pond sites in several regions of Indonesia, as well as to understand the salt production process based on the deposition of impurities at various stages of crystallization. The study was conducted at eight locations with different climatological and hydrological characteristics, including rainfall, soil permeability and type, duration of sunlight, air humidity, wind speed, air temperature, evaporation rate, and water saturation. The results of the study indicate that environmental parameters play a role in determining the effectiveness and efficiency of the salt production process. Pati and Aceh Besar districts are classified as unsuitable (N) for soil parameters, thus requiring adaptive technologies such as geomembranes and boiling methods. The salt crystallization process begins with the flow of seawater from the bozem to the crystallization table, where impurities such as mud, sand, Fe₂O₃, CaCO₃, CaSO₄•2H₂O, and gypsum are gradually deposited. Meanwhile, NaCl deposits form on the crystallization table, and MgSO₄ and NaBr compounds are found in the bittern pond. This study emphasizes the importance of land suitability mapping based on environmental parameters to enhance national salt productivity and quality, as well as serving as a foundation for developing more adaptive salt production policies tailored to regional conditions.
Analisis Kebijakan Inklusif terhadap Dinamika Lingkungan Kerja KRI : Tinjauan Kualitatif Manajemen SDM pada Satgas MTF UNIFIL Apsari, Windi; Umiyati, Sri; Sulistyanto, Sulistyanto
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.31732

Abstract

United Nations Security Council Resolution (UNSCR) 1325 (2000) emphasizes the importance of women’s participation and involvement in global peacekeeping missions. As part of its implementation, the Government of Indonesia, through the Indonesian Navy, issued an inclusive human resource (HR) policy by deploying members of the Indonesian Navy Women’s Corps (Kowal) in the Maritime Task Force (MTF) of the United Nations Interim Force in Lebanon (UNIFIL) beginning in 2021. Previously, from 2009 to 2020, all MTF UNIFIL personnel were male, creating a masculine work environment aboard Indonesian warships (KRI). This study aims to analyze the impact of the inclusive HR policy on the work environment dynamics in KRI, identify supporting and inhibiting factors, and examine male soldiers’ perceptions of the presence of Kowal. The research employs a qualitative descriptive method using interviews, observations, and documentation. The findings indicate that the presence of Kowal has brought positive changes to the work environment while maintaining the existing systems and organizational culture. Male personnel generally responded positively to their presence; however, the implementation requires strict gender-based regulations. The study recommends strengthening HR curricula with a focus on gender equality, adjusting the quota of Kowal according to KRI facilities, and formulating written gender-based regulations within the MTF UNIFIL.
Experimental Comparison of Double-Stage Runner Profiles in Gravitational Water Vortex Turbines for Improved Performance Risdiyanto, Gunawan; Septiyanto, Muhamad Dwi; Hadi, Syamsul; Tjahjana, Dominicus Danardono Dwi Prija; Budiana, Eko Prasetya; Andriyanto, Solikin
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.30683

Abstract

Gravity Water Vortex Turbines (GWVTs) are a new category of turbines used in micro-hydro power plants (MHPs). GWVTs can be used to optimize existing water flow potential, aerate water bodies, and maintain ecosystem integrity. The basic idea for this development stems from previous research showing that GWVTs with conical basins exhibit different flow velocity distributions at different locations. To exploit this potential, experimental analysis was conducted using a two-stage configuration with varying runner profiles and different flow rate conditions. A low-speed water tunnel with a conical basin was used to generate the vortex flow. Furthermore, the performance of the double-stage GWVT was compared with that of a single-runner GWVT in terms of power conversion. The study used several turbine configurations profiles, including Savonius and Flat with Curved. The findings measured torque, mechanical power conversion, and rotational speed. The GWVT performance results were evaluated using comparison-staging and inter-staging methods to determine the best performance of each turbine in generating power. The results showed that the Savonius blade profile on a single-runner GWVT installed in the lower stage position was superior in terms of power conversion. The best power generated is 53.7 Watts, and the efficiency is 52.3% at a flow rate of 9.1 L/s. The installation of two similar runners on a double-stage GWVT yields better power conversion than the installation of two different runners. A flat with Curved runners installed for the lower and upper stages on a double-stage GWVT shows the highest results of 56.7 Watts and 1.2 Watts. So, it can be concluded that the power conversion of a double-stage GWVT is superior to that of a single-runner GWVT.
Adsorpsi Fosfat Pada Limbah Cair Laundry Skala Rumahan di Kabupaten Jember Menggunakan Karbon Aktif dan Zeolit Teraktivasi Listifani, Dinissa Adinda; Pramitasari, Noven; Fildzah, Cantika Almas
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.31684

Abstract

Household-scale laundry wastewater contains phosphate, which poses significant environmental risks. This study aims to analyze the effectiveness of the adsorption process using activated carbon and activated zeolite in reducing phosphate concentrations from household laundry wastewater. The initial phosphate concentration in the wastewater was 5.19 mg/L. Adsorption was carried out using mass ratios of activated carbon and zeolite of 25:75, 50:50, and 75:25, as well as variations in zeolite activators using HCl and KOH. The research procedure included collecting laundry wastewater samples, drying and activating zeolite using 1 M HCl and 1 M KOH solutions, and mixing the adsorbents with wastewater in a batch system for 60 minutes under constant stirring. After the adsorption process, samples were filtered and analyzed for phosphate concentration using the spectrophotometric method. The results showed that the lowest phosphate concentration after adsorption was achieved with a mass ratio of activated carbon and zeolite activated by KOH at 25:75, which was 1.84 mg/L, with a phosphate removal efficiency of 64.5%. Statistical analysis using two-way ANOVA indicated that the mass ratio of activated carbon and zeolite significantly affected phosphate removal (p-value = 1.1 × 10⁻⁶), while the type of activator did not show a significant effect. This suggests that the appropriate mass ratio of activated carbon and zeolite can be an environmentally friendly and economical alternative for treating small-scale laundry wastewater.
Gamified Project-Based Learning Strategy to Enhance Students’ Collaboration and Creativity Skills: A Quasi-Experimental Study at Al-Islam Junior High School Krian Sidoarjo Bandono, Adi; Sabariah, Sabariah; Rufii, Rufii; Tardjo, Netty; Tafuzi, Novta Ittaqy; Sufairo, Nurus; Nugroho, Sukmo Hadi
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.32655

Abstract

This study examines the effectiveness of a Gamified Project-Based Learning (PjBL) strategy in enhancing students’ collaboration and creativity skills at SMP Al-Islam Krian Sidoarjo. Although PjBL has been widely implemented to foster 21st-century competencies, challenges remain in sustaining student motivation and engagement during project activities. Gamification through point systems, badges, levels, rewards, and leaderboards offers a potential solution by integrating game elements that stimulate student participation and intrinsic motivation. This study employed a mixed-methods approach with a quasi-experimental non-equivalent control group design. A total of 35 respondents were divided into two groups: an experimental group receiving gamified PjBL and a control group receiving conventional PjBL. Data were collected through pre-test and post-test instruments (using a Likert scale of 1–5), observation sheets, student interviews, and rubric-based project assessments. The findings demonstrate a significant increase in collaboration and creativity among students in the experimental group. Quantitative results reveal large effect sizes for both collaboration (d = 1.42) and creativity (d = 1.57), with p 0.001. In contrast, the control group showed only marginal improvements. Qualitative evidence from observations and interviews further indicates heightened engagement, stronger team communication, and increased idea generation among students exposed to gamified PjBL. The study contributes theoretically by enriching the discourse on the integration of gamification in PjBL environments and practically by offering empirical insights for secondary schools seeking to develop more interactive, student-centered pedagogical strategies. The findings underscore the potential of gamified PjBL as a transformative instructional model for cultivating essential 21st-century skills in Indonesian middle schools.

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