Prosiding Seminar Nasional Terapan Riset Inovatif (SENTRINOV)

EVALUASI EFISIENSI THERMAL POWER BOILER DENGAN MENGGUNAKAN METODE LANGSUNG

Imaniah Sriwijayasih — 2025-11-27

A boileris a device that produces steam or hot water by heating water or other fluids using heat energy from fuel. At PT.XYZ, there are two types of boilers, namely Power Boiler and Recovery Boiler Plant. Power Boiler produces steam with a pressure of 6300 kPa and a rate of 98 kg/s, while Recovery Boiler Plant produces steam from the digester extraction flow which is processed through flash tanks 1 and 2. Power Boiler uses BFB (Bubbling Fluidized Bed) technology with sand as a heating medium to burn rejects. This study analyzes the efficiency of waste-fired boilers at PT.XYZ Tanjung Enim using the direct method. The results of the analysis show that waste-fired boilers have a boiler efficiency value achieved of 60%, while the lowest boiler efficiency value is 33.4%. Factors that reduce boiler efficiency at PT.XYZ Tanjung Enim include waste which is the main fuel that still contains water content, cleanliness of the boiler tube surface, and water quality.

ANALISIS KEKUATAN SAMBUNGAN KAYU MENGGUNAKAN EPOXY DGEBA PADA GELADAK ATAP KAPAL KAYU TRADISIONAL

Rosdiyantoro Syarif S. J. — 2025-11-27

Wood remains a widely used construction material in the shipbuilding industry. However, the limited availability of high-quality wood has led to a decline in material performance, particularly due to the reliance on younger trees with lower mechanical properties. To address this challenge, proper joining techniques are required, and the quality of such joints must be carefully evaluated. The aim of this study is to analyze the strength of wood joints using DGEBA epoxy on the deck roof of wooden ships. Two connection models were investigated: the wood laminate model and the double sawn model, both bonded with DGEBA epoxy adhesive. The strength of the specimens was evaluated through bending and tensile tests. The results showed that the laminated joints achieved bending and tensile strengths of 41.86 MPa and 10.57 MPa, respectively, while the double sawn joints exhibited values of 54.68 MPa in bending and 1.33 MPa in tension.

INOVASI MINI EXCAVATOR LISTRIK: LANGKAH STRATEGIS MENUJU KONSTRUKSI BEBAS EMISI

Fuad Zainuri — 2025-11-27

The transformation of the construction sector toward more sustainable practices requires innovation in the use of heavy equipment, particularly in reducing carbon emissions. Mini excavators, as compact construction machinery commonly used in small- to medium-scale projects, have become a focal point of electrification efforts. This study explores the innovation in the development of electric-powered mini excavators as a strategic approach to support emission-free construction. The methodology includes a literature review, technical analysis of electric drive systems, energy requirement evaluation, and assessment of environmental impact and operational efficiency. The findings indicate that electric mini excavators can significantly reduce exhaust emissions and noise while lowering long-term operational costs. However, several challenges remain, such as high initial costs, limited charging infrastructure, and battery durability issues. This study recommends enhancing battery technology and hybrid systems as a transitional strategy toward fully eco-friendly heavy equipment to support low-emission construction initiatives.

INTEGRASI TEKNOLOGI KOMUNIKASI DIGITAL DAN PANEL SURYA DALAM REKAYASA PENCAHAYAAN ADAPTIF PADA SINTESIS MIKROALGA

I Gede Suputra Widharma — 2025-11-27

This research develops an adaptive lighting system for microalgae synthesis by integrating solar panels as a renewable power source and Internet of Things (IoT)-based digital communication technology. The system is designed using an ESP32 microcontroller connected to light (LDR), temperature (DS18B20), and pH (pH-4502C) sensors to regulate LED grow lights in real time. The adaptive control algorithm automatically adjusts light intensity—reducing brightness when natural light is sufficient or water temperature increases, and increasing brightness when natural light is low or pH decreases.

Experimental results show that the adaptive system successfully maintained culture stability, with water temperature controlled at 27–28 °C and average microalgae biomass reaching 2.98 mg/L. In terms of energy performance, the adaptive lighting system consumed only 70–75 Wh/day compared to 120 Wh/day for a static lighting system, resulting in approximately 38% energy savings.

This study demonstrates the potential of combining IoT-based adaptive control with renewable energy to support efficient and sustainable microalgae cultivation. The proposed system can serve as a model for green technology applications in ecological-based industries and green tourism development.

EVOLUSI DAN TREN RISET BIDANG NAVIGASI MARITIM CERDAS: ANALISIS CO-OCCURRENCE

Arif Ainur Rafiq — 2025-11-27

Maritime navigation plays a crucial role in global trade and logistics, increasingly supported by intelligent technologies such as artificial intelligence, sensors, Internet of Things (IoT), and autonomous systems. This study aims to map smart maritime navigation's evolution and research trends through a bibliometric analysis focusing on keyword co-occurrence. Using data from the Scopus database (2014–2025) and VOSviewer software, 2,927 author keywords were analysed, with 56 meeting the minimum threshold for visualisation. The results reveal seven main thematic clusters covering AI-based identification systems, autonomous ship technologies, e-navigation, IoT integration, and satellite-based positioning. The overlay visualisation shows that recent research trends have shifted toward LiDAR, object detection, deep learning, and unmanned surface vehicles. These emerging themes highlight transitioning from conventional navigation systems to more automated, intelligent, and adaptive technologies. This study contributes to a better understanding of the knowledge structure in the field and provides strategic insights for future research directions and innovation planning in smart maritime navigation.

PERANCANGAN DAN PENGEMBANGAN DYNAMOMETER SASIS UNTUK KENDARAAN LISTRIK PERKOTAAN DENGAN PEMANTAUAN WIFI SECARA REAL-TIME

Asep Apriana — 2025-11-27

SINTESIS DAN KARAKTERISASI SELULOSA XANTAT DARI TANDAN KOSONG

Dedi Teguh — 2025-11-27

Cellulose xanthate or viscose is an intermediate in the production of viscose rayon, which is used in the manufacture of textile fibers and cellophane wrapping. Meanwhile, synthetic fibers in textile applications such as polyester, nylon, and spandex have environmental impacts due to the use of non-biodegradable, non-renewable resources and increase carbon emissions. This study aims to synthesize empty oil palm bunches into xanthate cellulose by knowing the effect of carbon disulfide concentration ratio to cellulose weight and xanthation temperature. The best xanthate cellulose was obtained at a ratio of 1:1.4 and a xanthation temperature of 35°C, namely with a degree of polymerization of 297.08. The best degree of substitution was obtained at a ratio of 1:1.4 and a xanthation temperature of 37.5°C with a degree of substitution of 0.5499. The results of FTIR characterization, there are several new wave peaks in xanthate cellulose, namely around 2121.5 cm^-1, 2124.4 cm^-1, 2123 cm^-1 which indicate the presence of -NCS groups and wave peaks of 691 cm^-1, 697 cm^-1, 693 cm^-1 which indicate C-S groups. SEM results on xanthate cellulose show that the surface structure looks stretched, porous and expanded due to the alkalization and xanthation processes.

PENGARUH PERUBAHAN PROFIL DECK GIRDER TERHADAP KEKUATAN UPPER DECK ENGINE KAPAL AHTS

Alansyah Wahyu Wijaya — 2025-11-27

The purpose of this study is to investigate the impact of modifying the deck girder profile on the structural strength of an upper deck engine on an Anchor Handling Tug Supply (AHTS) at 5200 Above Baseline Level (ABL). Structural modifications are often taken into consideration for operational needs, while maintaining safety levels and strength. This analysis was performed numerically, using the Finite Element Method (FEM). The comparison was made by using two design conditions, which were existing profile (T400x9/120x10) in contrast to modified profile (T400x9/200x15) and calculating maximum stress (von Mises type), total deformation and safety factor. The simulation results indicate the modified design reduces the maximum stress from 175,84 MPa to 110,67 MPa, total deformation reduction from 13,131 mm to 2,67 mm and for safety factor from 1,34 to 2,12. Hence these improvements suggest that the modified girder profile improves structural performance and complies with classification standards of the American Bureau of Shipping (ABS). This study also provides a technical framework whereby possibilities for structural redesign can be efficient and safe in building a ship.

PEMODELAN INTERAKTIF MOTOR DC BN23HS: STUDI DUA SKEMA LOOP

Devina Puspita Sari — 2025-11-27

This study explores the mathematical modeling and simulation of a BN23HS-18HS type direct current (DC) motor system using both open-loop and closed-loop control approaches. DC motors are widely utilized in industrial and robotic applications due to their precision in speed and position control. Achieving optimal performance requires a thorough understanding of their dynamic behavior and the implementation of effective control systems. The research begins with a theoretical analysis of the physical and electromechanical characteristics of the motor, leading to the development of a mathematical model in the form of differential equations. This model is then implemented in simulation software for testing and validation. Simulations are conducted for both open-loop (without feedback) and closed-loop (with PID controller feedback) configurations. While the primary focus is on modeling and simulation, PID control is discussed conceptually. The simulation results indicate that the developed model accurately represents the motor’s dynamic response. The open-loop system reveals limitations in accuracy and stability, whereas the closed-loop configuration shows significant improvements in speed and position control. This study highlights the importance of modeling and simulation as foundational steps in developing effective DC motor control systems and provides a basis for future work in PID implementation and control system design.

OPTIMALISASI PID ADAPTIF UNTUK KENDALI MOTOR DC BN23HS-18HS

Anggara Trisna Nugraha — 2025-11-27

This study investigates the modeling and simulation of a BN23HS-18HS DC motor in both open-loop and closed-loop configurations, applying a PID controller tuned using the Ziegler-Nichols method. DC motors are commonly used in industrial and robotic systems due to their precise speed and position control capabilities. Optimal performance requires a clear understanding of the motor’s dynamic characteristics and an effective control strategy. The research begins with developing a mathematical model based on the motor’s physical and electromechanical properties. This model is then simulated to analyze system behavior under both control schemes. In the closed-loop setup, the PID controller enhances system response and stability. Simulation results show that the mathematical model effectively represents the motor's dynamic behavior. The open-loop system lacks accuracy and stability, whereas the closed-loop system using the Ziegler-Nichols PID controller demonstrates significant improvements in speed and position control. This study highlights the importance of accurate modeling and simulation as a foundation for designing advanced control systems for DC motors. Future work should focus on real-time implementation and further refinement of control strategies.

SIMULASI MOTOR DC BLM57050 ORDE 2 DENGAN ZIEGLER-NICHOLS

Purwidi asri — 2025-11-27

DC motors are widely used in various industrial applications and automatic control systems due to their ability to provide high torque and good dynamic response. This research focuses on the mathematical modeling and simulation of a DC motor type BLM57050 using a second-order approach. The mathematical model considers key parameters such as resistance (R), inductance (L), torque constant (Kt), and moment of inertia (J). This model is used to simulate the system's response in both open loop and closed loop configurations. In the open loop configuration, the motor's response to input voltage is analyzed without feedback mechanisms, identifying initial dynamic characteristics such as rise time, settling time, and delay time.

This study provides comprehensive insights into the dynamic characteristics of the BLM57050 DC motor and emphasizes the importance of implementing PID controllers to achieve optimal system performance. Simulations were conducted using MATLAB/Simulink software, allowing clear visualization of the system's response under various operating conditions. The results are expected to serve as a valuable reference for engineers and researchers in developing more efficient control systems for DC motor applications.

PENGENDALI MOTOR DC INDUSTRI BERBASIS PSIM DAN PENYEARAH SATU FASA

Endang Pudji Purwanti — 2025-11-27

The development of three-phase DC motor technology has opened up various solutions for motor speed control in industrial applications. The use of autotransformers is often considered inefficient and impractical, especially when expensive and difficult-to-replace components fail. Furthermore, suboptimal armature voltage regulation can increase operational safety risks. This study proposes a more efficient, economical, and safe three-phase DC motor speed control system, using PSIM software and a thyristor-based fully controlled rectifier. This system is simulated with the aim of reducing the potential for operational failures that endanger worker safety, while simultaneously improving energy efficiency. Through PSIM simulation, motor speed regulation can be carried out more precisely, thereby reducing the risk of operational errors. The simulation results show that the greater the ignition angle, the motor speed also increases. For example, at T = 0 Nm and an ignition angle of 0°, a DC voltage of 184.64 volts is generated with a motor speed of 2927.94 RPM. This system provides a more reliable and energy-efficient motor control solution for industrial environments that require accurate and safe speed regulation.

OPTIMALISASI LIMBAH KULIT JERUK DENGAN PENAMBAHAN PENAMBAHAN KAYU SECANG SEBAGAI BAHAN BAKU TEH ANTIOKSIDAN

Oktavia Nurmawaty Sigiro — 2025-11-27

Antioksidan berperan penting dalam menangkal radikal bebas dan melindungi tubuh dari kerusakan oksidatif yang dapat memicu berbagai penyakit degeneratif. Dalam penelitian ini, aktivitas antioksidan dianalisis menggunakan metode DPPH pada teh yang diformulasikan dari kulit jeruk siam dan kayu secang. Selain itu, kadar air diuji dengan metode gravimetri karena merupakan indikator penting dalam menentukan kualitas dan daya simpan teh kering. Kayu secang diketahui mengandung senyawa aktif seperti brazilin, flavonoid, dan tanin yang memiliki potensi antioksidan tinggi. Sementara itu, kulit jeruk siam kaya akan vitamin C, flavonoid, dan polifenol, menjadikannya bahan yang potensial untuk meningkatkan nilai fungsional produk. Teh disusun dalam tiga formulasi berdasarkan proporsi bahan: 0,5 gr kulit jeruk siam + 1,5 gr kayu secang (P1), 1 gr kulit jeruk siam + 1 gr kayu secang (P2), dan 1,5 gr kulit jeruk siam + 0,5 gr kayu secang (P3). Hasil pengujian menunjukkan bahwa perlakuan P1 menghasilkan aktivitas antioksidan yang paling tinggi sebesar 26.09 ppm.Sedangkan kadar air terendah diperoleh pada perlakuan P1 sebesar 7,06%. Hasil analisis statistik (ANOVA) menunjukkan adanya pengaruh yang sangat nyata terhadap kedua parameter.

PENGUJIAN ALAT PENETAS TELUR AYAM DENGAN Node Micro Chip Unit

Muh Anhar — 2025-11-27

Today's scientific and technological developments are increasingly sophisticated. This is evidenced by numerous discoveries that have aided human work processes. One example is the test of a 50-egg chicken egg, which was realized, and data obtained from the results of a 50-egg chicken egg test. The use of egg incubators is now commonplace. Their use simplifies the workload of using an incubator.This test aims to make farmers comfortable with manual incubators, which facilitate the process of hatching poultry eggs.Egg incubators are a method of hatching poultry eggs using an incubator, or a method that mimics the behavior of a hen during the incubation period. The eggs are turned twice a day, morning and afternoon, to evenly expose them to the heat from a lamp. Recent observations of 50 eggs showed a hatching rate of only 30, which hatched within 22 days.

OPTIMASI DESAIN RUNNER DAN GATE SYSTEM PADA PROSES INJEKSI PLASTIK UNTUK RANGKA KACAMATA SAFETY

Stenli Octavian Eridheni — 2025-11-27

Plastic has become a dominant material in modern manufacturing industries due to its lightweight, low cost, and easy processing. However, around 15% of injection molding products fail because of non-optimal runner and gate design, while in the case of safety glasses frames, the rejection rate reaches 18–20% due to weld lines and air traps. This study aims to optimize the runner and gate system design in plastic injection molding for safety glasses frames using Autodesk Moldflow. Several runner (full round vs trapezoidal) and gate (fan vs edge) configurations were compared to evaluate filling time, injection pressure, weld lines, and air traps. The results show that the full round runner with fan gate configuration achieved the best performance with a filling time of 1.904 s, injection pressure of 75.6 MPa, only 2 weld lines, and 1 air trap. Compared to the worst configuration (trapezoidal–edge gate), this design reduced filling time by 12%, decreased injection pressure by 15%, and minimized weld line and air trap defects by 30–40%. These findings demonstrate that CAE-based simulation is effective in reducing trial-and-error approaches and increasing mold design efficiency.

ANALISIS FLANGE LEAKAGE SISTEM PIPA GAS SALES RECEIVER BERBASIS SIMULASI DAN MANUAL

Ni’matut Tamimah — 2025-11-27

Flange leakage assessment is a crucial step in ensuring the safety and reliability of piping systems, particularly in critical equipment such as Shut Down Valves (SDV). This study aims to analyze the flange leakage values at two key locations, namely node 110 and node 120, in a gas pipeline system. Simulation results show leakage values of 1457.45 lb/in² and 1471.93 lb/in², respectively—both below the allowable limit of 1480 lb/in². Additionally, manual calculations yielded leakage values of 1453.32 lb/in² and 1468.76 lb/in². The error percentages between simulation and manual methods are relatively small, at 0.22% and 0.28%. Therefore, it can be concluded that the piping system in the Gas Sales Receiver is safe and suitable for operation under its designated conditions.

PEMILIHAN KONSEP DESAIN HAND LIFT MANUAL KAPASITAS 1 TON DENGAN METODE ULRICH

Rizal Indrawan — 2025-11-27

Manufacturing companies are companies engaged in Engineering, Fabrication, and Construction. Manual Hand Lift itself can be used to lift, lower, and move materials from one place to another. This type of lifting mechanism on the hand lift uses a pulley system. Hand lifts with sizes that match the dimensions of the company make it easier to move materials and some machines to be worked on. In making this design, product development uses the Ulrich method which has 6 phases: (Planning, Concept development, System level design, Detailed design, Testing and improvement, and Product launch). The concept selection in this design uses a pulley system as a lifting system where compared to the hydraulic system, the pulley system has a longer displacement distance because the pulley system uses a 6 x 19 IWRC steel rope and lifts goods faster because it uses a motor drive. The results of this research found that the selected design saves more time to lift and use a motor that greatly facilitates workers and avoids excessive fatigue. This tool is made from UNP canal, and hollow which has dimensions of 1100mm long x 600 mm wide x 1750 mm high. And the cost of selecting this tool design is Rp. 6,197,400, -

ANALISA TEGANGAN DAN DEFORMASI KAPAL PATROLI BERBAHAN MATERIAL HDPE AKIBAT PENGARUH BENDING MOMENT PADA PERAIRAN BERGELOMBANG

Alif Nur Rochmad — 2025-11-27

PENGARUH PEMANFAATAN FLY ASH TERHADAP KARAKTERISTIK CAMPURAN ASPAL BERPORI UNTUK LAPISAN AC-WC

Shaviola S.M. Nurhayun — 2025-11-27

Porous asphalt is a type of road pavement layer with a lower proportion of fine aggregate, resulting in larger voids compared to conventional dense-graded asphalt pavement. Due to larges pores structure, the use of pozzolanic materials such as limestone, fly ash, etc has been investigated to improve the stabilty of porous asphalt. The aims of this study is to experimentallty investigated the characteristic of porous asphalt containing fly ash as a replacement of stone ash at percentage of 3%, 5%, and 7% by wt.. The results show that the highest stability of porous asphalt containing 5.5% asphalt content was achieved at 7% addition of fly ash with a stability value of 1130.36 kg. Porous asphalt with fly ash contents of 3% and 5% resulted in relatively lower stability values, but still within specification limits. Moreover, the permeability test results for porous asphalt, both with and without fly ash addition, met the specifications from AustralianAsphalt Pavement Association (AAPA, 2004). Furthermore, fly ash as an industrial waste is promising in making more stable porous asphalt that can be applied for light load pavement while at the same time beneficial in storm water management.

PERENCANAAN PERAWATAN DAN PERSEDIAAN SUKU CADANG PADA MESIN POMPA MENGGUNAKAN METODE RCM II DAN RCS

Dika Rahayu Widiana — 2025-11-27

Manufacturing companies engaged in the processing of lubricating oil are companies that are active in recycling used oil into new oil (recycled oil) and producing various other types of lubricants. One of the processes that has a high risk in this industry is the hydrofinishing process. The P-101A pump machine is the machine that most frequently experiences failure in this process. Failure Mode and Effect Analysis (FMEA) was used to identify the failure mode and risk priority number of each component. Reliability Centered Maintenance II (RCM II) was used to estimate optimal maintenance intervals, and Reliability Centered Spares (RCS) was used to determine efficient spare parts requirements. The results of the FMEA analysis showed there are 27 components with 28 failure modes. The highest RPN is pressure safety with an RPN of 162. RCM II analysis results in three maintenance tasks: a scheduled restoration task for 3 components, a scheduled discard task for 14 components, and a scheduled on-condition task for 1 component. Based on the RCS method, it is estimated that 51 units of non-repairable spare parts and 10 units of repairable spare parts are required every year.

RANCANG BANGUN MESIN PENGERING KAIN BATIK MENGGUNAKAN VOICE OF COSTUMER

Arifia Ekayuliana — 2025-11-27

This research aims to design a batik cloth drying machine that addresses the specific needs of business actors, thereby overcoming the obstacles of traditional drying during the rainy season. The conventional batik drying process is vulnerable to weather disturbances and has the potential to reduce product quality. Using the Voice of Customer (VOC) approach, data was collected through open and closed questionnaires from 30 batik business respondents. Factor analysis revealed two main needs: the specification of a dryer that facilitates and increases productivity (Factor 1) and the need for an additional dryer during the rainy season (Factor 2). The results of this analysis led to the design of a batik drying machine that combines spinning and hot air blowing systems, equipped with UV light in the drying chamber. The design is expected to provide an efficient, easy-to-use drying solution that contributes to improving the productivity and quality of batik, especially in uncertain weather conditions.

PENILAIAN DAN MITIGASI RISIKO PROYEK KONSTRUKSI PADA TAHAP STUDI KELAYAKAN

Ni Kadek Sri Ebtha Yuni — 2025-11-27

Construction activities are a sector that involves various disciplines, complex work items, and high levels of risk. These risks do not only arise at the implementation stage, but are spread throughout the project stage, including the feasibility study stage which often receives little attention. Feasibility studies are a crucial initial stage in the life cycle of a construction project. This stage aims to evaluate whether a project is feasible to implement from various aspects, before a larger investment is made. Feasibility studies assist project owners, investors, and other stakeholders in making informed decisions regarding the continuation or cancellation of projects. This study aims to identify and evaluate risks at the feasibility study stage to determine the dominant risks that require mitigation measures. The methods used included literature studies and observations through the distribution of questionnaires to 15 respondents with qualitative and quantitative approaches. Data was collected from relevant literature as well as responses from experienced construction practitioners. The identification results showed that there were 42 types of risks coming from 6 main sources. Major risks consist of 29 risks with undesirable categories. Mitigation strategies are designed as a form of control over dominant risks with the aim of minimizing the likelihood of risk occurring and reducing the impact it causes.

IDENTIFIKASI CEPAT PARAMETER DINAMIK JEMBATAN RANGKA BAJA BERBASIS LOW-COST SENSOR

Alan Putranto — 2025-11-27

Bridges are vital transportation infrastructures subject to dynamic loads from traffic and environmental influences, which can degrade structural performance over time. Conventional structural health monitoring (SHM) systems are often limited by cost and complexity. This study investigates the use of embedded smartphone accelerometers and the ambient vibration test (AVT) method to identify dynamic parameters of steel truss bridges in Ketapang, West Kalimantan. The study employs a non-destructive, low-cost approach by using daily traffic as a natural excitation source. Several bridges were selected based on service lifetime, visible damage, and functional condition. Data collection was performed using the Resonance Android application, which records acceleration and processes it into frequency spectra. Dominant frequencies and damping ratios were extracted from the results. Field measurements on Pawan 1 and Pawan 2 bridges indicate that several dynamic parameters, including frequency, displacement, and damping ratio, exceed standard limits, suggesting possible structural degradation. These findings demonstrate that smartphone-based monitoring can provide preliminary diagnostic insights and support decisions for more advanced, cost-intensive evaluations.

PENGARUH KECEPATAN ANGIN TERHADAP STABILITAS UAV DAN KUALITAS CITRA INSPEKSI STRUKTUR JEMBATAN

Muhammad Hanif Faisal — 2025-11-27

SISTEM ABSENSI BERBASIS PENGENALAN WAJAH MENGGUNAKAN DEEPFACE

Entin Martiana Kusumaningtyas — 2025-11-27

Manual attendance systems frequently encounter issues such as time fraud, human error, and inefficiencies, particularly in organizations adopting hybrid or remote work models. These limitations reduce the reliability of attendance records and hinder accurate workforce monitoring. To overcome these challenges, a facial recognition-based attendance system was designed and implemented, offering a secure, automated, and contactless alternative to conventional methods.The system leverages state-of-the-art facial recognition technologies, including DeepFace for face verification, RetinaFace for face detection, and FaceNet512 for feature extraction and comparison. In addition to facial biometrics, GPS-based geolocation and liveness detection techniques are integrated to ensure that the individual is not only correctly identified but also physically present during attendance. This multi-factor verification enhances security and minimizes the risk of spoofing or proxy attendance. Performance testing conducted in real-world scenarios indicates a True Acceptance Rate (TAR) of 94% and a False Acceptance Rate (FAR) of 0%, demonstrating high accuracy and robustness. The system presents a practical and efficient solution for modern attendance tracking needs, supporting organizations in improving accountability, compliance, and operational efficiency as part of broader digital transformation initiatives.

PENGEMBANGAN SISTEM SMART LOCKER DENGAN AUTENTIKASI RFID BERBASIS IOT

Okta Gabriel Sinsaku Sinaga — 2025-11-27

The rapid development of Internet of Things (IoT) technologies has enabled the creation of intelligent and connected storage systems. This study aims to design and implement a Smart Locker system with RFID-based authentication and real-time monitoring using Firebase cloud services. The system is developed using the ESP32 microcontroller, RC522 RFID reader for identity validation, and a React-based web interface for managing user data and monitoring access history. The methodology involves hardware-software integration and system validation through black box testing to assess the core functionalities. Test results indicate a system response time of less than 2 seconds, 100% success rate in valid card detection, and 96% success in log transmission to Firebase. Unlike previous systems which relied on local storage or manual access control, this research delivers a functional prototype with cloud integration and remote monitoring capabilities. The system is designed for potential implementation in campus environments such as libraries and can be extended for broader applications..

ANALISIS PENGARUH KETEBALAN MATA CUTTER TERHADAP DEFORMASI UNTUK PROSES PEMOTONGAN PLASTIK POLYETHYLENE (PE)

Hakim Faruli Siregar — 2025-11-27

Penelitian ini bertujuan untuk menganalisis pengaruh berbagai ukuran mata cutter terhadap penurunan deformasi selama proses pemotongan material plastik polyethylene (PE) menggunakan metode Finite Element Analysis (FEA). Mata cutter memegang peranan penting dalam mengontrol proses pemotongan material dengan meminimalkan gesekan antara cutter dan material, yang dapat memperpanjang umur alat serta meningkatkan kualitas potongan. Penelitian ini menggunakan software Ansys 2025 R1 untuk memodelkan dan menganalisis variasi desain mata cutter dengan ukuran yang berbeda (2 mm, 3 mm, dan 4 mm). Hasil simulasi menunjukkan bahwa ukuran yang lebih besar menghasilkan penurunan deformasi yang lebih signifikan, dengan desain ukuran 4 mm memberikan hasil terbaik. Temuan ini memberikan wawasan mengenai pentingnya pemilihan ukuran mata cutter yang optimal untuk meningkatkan efisiensi proses pemotongan dan memperpanjang ketahanan alat potong.

PENGUJIAN ALAT PENGOLAHAN AIR LIMBAH BERBASIS TEKNOLOGI ELECTROCOAGULATION BERTINGKAT BERBASIS IOT

Wisnu Hendri Mulyadi — 2025-11-27

The increase in the amount of untreated domestic liquid waste poses a serious challenge to the environment, especially in densely populated areas. This research aims to design and test a wastewater treatment tool using electrocoagulation technology, designed in a tiered manner. The wastewater treatment process uses two levels of electrocoagulation tank processes and is organized in a staggered manner that is integrated with a PLC-based automation system and real-time water quality monitoring via ESP32. The system consists of four tiered (cascade) tanks with an automatic water transfer mechanism without a pump, and is equipped with pH, TDS, and turbidity sensors. Testing was conducted with contact times of 10, 15, and 20 minutes. The results showed a decrease in pH from 9.3 to 8.6 at 10 minutes, 8.3 at 15 minutes, and 8.1 at 20 minutes; TDS from 736 to 546 mg/L at 10 minutes, 424 mg/L at 15 minutes, and 344 mg/L at 20 minutes; and turbidity from 1959 to 1587 NTU at 20 minutes. Energy consumption ranges from 5.43–12.39 Wh, with very low operational costs (Rp7.84–Rp17.89 per cycle).. The control and monitoring system has proven capable of improving the efficiency and effectiveness of the processing.

EKSPLORASI KEMAMPUAN OPEN-SOURCE CFD OPENFOAM UNTUK SIMULASI FREE-SURFACE DAM BREAK DENGAN AMR

Niki Veranda Agil Permadi — 2025-11-27

Fenomena dam break merupakan salah satu kasus klasik dalam dinamika fluida yang menggambarkan pergerakan aliran dua fasa secara tiba-tiba akibat jebolnya bendungan atau tanggul. Studi ini mengeksplorasi kemampuan perangkat lunak open-source computational fluid dynamics (CFD) OpenFOAM dalam mensimulasikan aliran permukaan bebas pada kasus dam break menggunakan solverinterFoam . Fitur adaptive mesh refinement (AMR) diterapkan untuk meningkatkan akurasi simulasi di sekitar antarmuka air-udara. Hasil simulasi menunjukkan bahwa mesh dengan AMR mampu merepresentasikan pembentukan gelombang, tinggi muka air, dan sebaran tekanan yang lebih akurat sesuai dengan realitas fisik yang ditunjukkan pada eksperimen. Mesh dengan AMR cenderung memberikan prediksi tekanan yang lebih akurat dibandingkan mesh tanpa AMR pada sebagian besar lokasi pengukuran. Secara lokal,mesh dengan AMR berhasil menurunkan error pembacaan tekanan sebesar 6.7% di probes P1, 20% di probes P2, dan 23% di probes P7 apabila dibandingkan dengan mesh tanpa AMR. Hasil ini menunjukkan bahwa AMR memberikan peningkatan akurasi simulasi. Studi ini juga membuka potensi penerapan OpenFOAM untuk kasus dinamika fluida di bidang maritim seperti struktur terapung, slamming, green water, dan sloshing.

PERANCANGAN DAN ANALISIS 5G FIXED WIRELESS ACCESS UNTUK AKSELERASI TRANSFORMASI DIGITAL

Asri Wulandari — 2025-11-27

The advancement of 5G technology offers significant potential in driving digital transformation, especially in residential areas. One key application is 5G Fixed Wireless Access (FWA), providing high-speed internet without complex fiber infrastructure. 5G FWA delivers broadband via wireless transmission from a gNodeB to a fixed receiver with customer premises equipment (CPE) in homes or buildings. This study aims to design and analyse a 5G FWA network in Alam Sutera Residential, using 2300 MHz frequency and 30 MHz bandwidth, covering an area of 5.7 km². The analysis involves capacity and coverage calculations to determine optimal gNodeB deployment. Based on capacity analysis, the network requires 13 gNodeB for downlink and 10 for uplink, serving 5135 households with a guaranteed throughput of 30 Mbps per user. Coverage analysis, using propagation and link budget models, indicates a need for 10 gNodeB for downlink and 7 for uplink. Considering both approaches, the optimal gNodeB requirement is set at 13 sites, ensuring reliable service for high-demand scenarios.

INVESTIGASI STABILISASI TANAH LUNAK PADA LAHAN GAMBUT KABUPATEN KETAPANG DENGAN CERUCUK BAMBU

Suratmin — 2025-11-27

The bamboo piles method is often used in Ketapang West Kalimantan. The use of bamboo piles type gutter is very rare. This study aims to investigate the effectiveness of the use of bamboo piles in increasing the stability of peat soil as a vertical channel in Ketapang Regency. The research method is by conducting tests in the laboratory and in the field. The parameters used in the study were two types of bamboo with a total of 40 pieces, soil mediation in the field, plate load, concrete cube load, and settlement dial readings. The results of the settlement from the investigation of soft soil stabilization on peatland in Ketapang Regency with bamboo piles without load were 0,018. While the results of the settlement with a load were 0,094.

OPTIMASI STOCHASTIC GRADIENT DESCENT ADAPTIF UNTUK PREDIKSI OEE REAL-TIME PADA SISTEM PENGISIAN BOTOL ELEKTRONIK BERBASIS PLC

Hosea Okta Christanta — 2025-11-27

This study develops an adaptive Stochastic Gradient Descent (SGD) optimization method for real-time Overall Equipment Effectiveness (OEE) prediction in industrial PLC-based electronic bottle filling systems. A neural network model was implemented using a dataset of 40,000 production samples with the format [operating_time, downtime, total_count, good_count, pressure, OEE]. Experimental results showed high accuracy (R² = 0.9906; MAE = 0.0076) with an inference time of 1.2 ms per cycle. Analysis revealed that good_count (59.41%) and system pressure (25.42%) are the dominant factors for OEE. The implementation of adaptive control increased production efficiency by 22.7% in a system with a 30L capacity and a speed of 4 bottles per minute

ANALISIS KINERJA MESIN DIESEL EMPAT LANGKAH MENGGUNAKAN BIODIESEL DARI MULTI-FEEDSTOCK: MINYAK SAWIT, ZAITUN, DAN CANOLA

Eky Novianarenti — 2025-11-27

Penelitian ini bertujuan untuk mengevaluasi karakteristik fisik dan performa unjuk kerja mesin diesel empat langkah menggunakan biodiesel berbasis multi-feedstock (minyak kelapa sawit, minyak zaitun, dan minyak canola). Pengujian dilakukan terhadap berbagai campuran biodiesel, dengan fokus pada B100 dan B35. Hasil karakterisasi bahan bakar menunjukkan bahwa biodiesel B100 memenuhi standar mutu SNI, dengan titik nyala sebesar 147°C, densitas 879.24 kg/m³, viskositas 3.5775 cSt, angka setana 74.8, serta nilai kalor sebesar 9,519 kal/gr. Semakin tinggi prosentase biodiesel, karakteristik titik nyala, densitas, viskositas, dan angka setana meningkat, sementara nilai kalor cenderung menurun. Dari sisi performa mesin, daya dan torsi tertinggi dicapai oleh bahan bakar B100 dengan masing-masing 1,74 kW dan 1,53 Nm. Namun, konsumsi spesifik bahan bakar (gsfc) paling optimal diperoleh pada campuran B35 sebesar 439,603 gr/kWh. Dengan demikian, biodiesel B100 menunjukkan performa terbaik dalam hal daya dan torsi, sedangkan B35 lebih unggul dalam efisiensi bahan bakar.

IMPLEMENTASI SISTEM PEMANTAUAN TANAMAN HIDROPONIK BERBASIS IOT MENGGUNAKAN METODE KLASIFIKASI KNN

Aditya Satriyo Wibisono — 2025-11-27

This project displays a hydroponic plant monitoring system that uses an ESP32 microcontroller with a range of sensors—including TDS, pH, light, temperature, humidity, and water level—to keep an eye on environmental conditions. The data collected is processed and shared through platforms like Blynk, Telegram, and a simple 16x2 I2C LCD display. To predict how healthy the plants are, the system uses the K-Nearest Neighbors (KNN) algorithm based on the real-time sensor data, helping users keep conditions just right. Tests with five different data setups showed that the sensors are pretty accurate: HC-SR04 at 90.9%, DHT11 temperature at 99.29%, DHT11 humidity at 90.32%, and BH1750 at 98.84%. The TDS sensor needs calibration using a 1382 ppm solution before use. When connected to a 46 Mbps network, the data takes about 1.4 to 2.1 seconds to travel from the system to the user interface. Overall, this setup provides dependable, real-time environmental monitoring combined with smart analysis, making it a helpful tool for hydroponic farming.

PENGEMBANGAN PROTOTIPE AUGMENTED REALITY DAN INTERNET OF THINGS (AR-IOT) UNTUK PERAWATAN MESIN INDUSTRI

Agus Wagyana — 2025-11-27

Industrial machine maintenance plays an important role in ensuring continuous production. Common issues such as delayed fault detection, lack of real-time data, and reliance on technician expertise can lead to costly downtime. This study proposes a prototype system that integrates Augmented Reality (AR) and the Internet of Things (IoT), known as AR-IoT, for efficient industrial machine monitoring and control. The system is built using an ESP32 microcontroller that collects temperature, vibration, and pressure data through LM35, ADXL345, and MPS20N0040D sensors. The sensor data is transmitted via Wi-Fi to the MQTT broker (HiveMQ Cloud), and displayed in real-time through an AR interface developed with Unity and Vuforia. The interface allows users to monitor sensor data and control actuators such as relays and alarms interactively. The system also utilizes Firebase for cloud data storage. Experimental results show that the AR-IoT system functions stably and responsively, with successful integration between AR visualization and IoT-based control. The developed prototype demonstrates the potential of AR-IoT systems in improving maintenance accuracy, responsiveness, and operational efficiency in industrial settings.

SMART NUTRITION SCALE UNTUK DETEKSI GIZI BAYI DAN REKOMENDASI MPASI OTOMATIS

Retno Sukmaningrum — 2025-11-27

Abstract - Monitoring the nutritional status of infants aged 6 to 12 months is crucial, as it has a direct impact on physical growth, cognitive development, and overall health. This study introduces a Smart Nutrition Scale designed around an ESP32 microcontroller. It incorporates a load cell sensor for measuring body weight and a rotary encoder for detecting body length. The system automatically processes the measurement data using anthropometric parameters and WHO Z-score standards to classify nutritional status. It then generates personalized complementary feeding (MPASI) recommendations based on the infant's age, sex, and nutritional category, detailing the daily requirements for carbohydrates, proteins, and fats. The results of the measurements and the recommendations are displayed on an LCD screen and a connected web interface via Firebase. Accuracy tests demonstrate a weight measurement precision of 96.48% and a length accuracy of 99.71%. This innovative system serves as a practical and accessible tool to assist parents and healthcare professionals in early nutritional screening and guidance for complementary feeding.

SISTEM KASIR DI APLIKASI ANDROID YANG DAPAT MENYIMPAN DATA MENGGUNAKAN DATABASE OFFLINE

Aprilia Dwi Cristyana — 2025-11-27

Micro, Small, and Medium Enterprises (MSMEs) are an essential pillar of Indonesia’s economy, yet many still rely on manual record-keeping that is prone to errors, inefficiency, and difficulties in generating accurate reports. To address these limitations, this study proposes Excash, an Android-based point-of-sale application designed specifically for MSMEs. Unlike many existing cashier applications that require constant internet connectivity, Excash operates fully offline using the SQFLite database, making it more reliable in areas with unstable networks. Furthermore, Excash integrates features rarely combined in similar systems, including product and inventory management, CSV-based data export and import for cross-device use, and seamless receipt printing through a thermal printer. The user interface was developed using a User-Centered Design (UCD) approach to ensure accessibility for non-technical users. The application was tested for three days at Laila’s grocery store with an Android device and Bluetooth thermal printer. Results demonstrated 100% transaction accuracy, response times under one second, and a 97% user satisfaction score, highlighting its practicality and effectiveness. Excash proves to be an innovative solution that enhances operational efficiency, ensures precise transaction handling, and simplifies usage for MSMEs. These findings confirm its potential to significantly improve the competitiveness and sustainability of small businesses in Indonesia.

APLIKASI PEMANTAUAN KAPAL MENGGUNAKAN DATA AUTOMATIC IDENTIFICATION SYSTEM DI PERAIRAN BENGKALIS DAN SELAT MALAKA

Supria — 2025-11-27

Since 2019, the Center of Excelent (CoE) for Underwater Infrastructure Development in the Melaka Strait Waters of Politeknik Negeri Bengkalis has focused on research and development of the Automatic Identification System (AIS) for the purposes of ship security and safety at sea. Many fishermen on the island of Bengkalis do not use AIS devices because the price is quite expensive, so fishermen cannot monitor the presence of ships around them which causes many ship accidents. In this research, Smart Mobile AIS Polbeng is proposed: Development of Mobile Applications for Ship Monitoring Based on Polbeng AIS Data in the Strategic Waters of the Malacca Strait. With this system, it is expected to provide convenience in monitoring ships in the waters around the island of bengkalis, namely the bengkalis Strait and the Malacca Strait. Mobile-based monitoring applications can be used by related parties in monitoring ships around and can also be used by fishermen to monitor existing ships so as to minimize the occurrence of ship accidents. In addition, using this mobile application can reduce the cost of fishermen in monitoring ships compared to using AIS devices at a fairly expensive price.

DEPLOYMENT WEBSITE HUMAN RESOURCE INFORMATION SYSTEM (HRIS) DENGAN GOOGLE CLOUD PLATFORM

Viving Frendiana — 2025-11-27

Penelitian ini membahas proses deployment website Human Resource Information System (HRIS) menggunakan Google Cloud Platform (GCP). Website HRIS merupakan aplikasi berbasis Laravel yang menyediakan fitur manajemen data karyawan seperti presensi, penggajian, tugas, dan cuti. Penggunaan GCP memungkinkan deployment yang fleksibel, aman, dan skalabel melalui layanan seperti App Engine, Cloud SQL, dan Cloud Storage. Proses deployment dilakukan menggunakan Google Cloud Shell dan diuji melalui pengujian fungsionalitas dan keamanan. Hasil menunjukkan bahwa seluruh fitur utama website berfungsi sesuai harapan dengan tingkat keberhasilan 100% dalam 40 skenario uji. Pengujian keamanan menggunakan Sucuri Security Scanner menunjukkan bahwa sistem bebas dari malware dan tidak termasuk dalam daftar blacklist, meskipun terdapat potensi risiko keamanan minor. Penelitian ini menunjukkan bahwa integrasi HRIS dengan GCP dapat meningkatkan efisiensi pengelolaan SDM dan memberikan solusi teknologi yang andal bagi organisasi.

ANALISIS HUBUNGAN LEBAR KATIR TERHADAP STABILITAS DAN KARAKTERISTIK GERAK ROLLING KAPAL PERIKANAN TRADISIONAL PADA SUDUT GELOMBANG BEAM SEA

Moh. Saiful Rahman Hamka — 2025-11-27

Abstract. Outrigger construction is usually used by ships with small sizes that function to increase the stability of the ship. However, the construction of the outrigger has a negative impact on the parking capacity of the ship at the port dock. This study aims to determine the effect of changing the width of the outrigger on the value of ship stability and rolling motion. The research method carried out is by testing ship models with different widths of outriggers. The width variations are 1.75m and 1.25m. Tests were carried out using numerical simulations using ship design software. The parameters analyzed are the ship's tilt angle (GZ) stability curve area value, maximum tilt angle, and rolling motion response in the form of the Root Mean Square (RMS) value of the ship's rolling. Based on the results of the study, it shows that changes in the width of the katir can affect the value of ship stability although not too significant, the ship stability value of all model ships is still in accordance with IMO standards or has positive stability. In addition, the rolling RMS value decreases as the width of the outrigger decreases, so the rolling motion of the ship becomes safer for the safety of the fishing boat crew. Ship model 1 has the best stability value than ship model 2 and is closest to the control ship. Ship model 1 has the best rolling RMS value when compared to the rolling RMS value of the control ship and ship model 1.

ANALISIS KINERJA FITUR AUGMENTED REALITY DI KOTA TUA SURABAYA BERBASIS WEB XR

Muhammad Adi Stiyawan — 2025-11-27

Existing AR-based cultural heritage solutions often rely on platform-specific apps or hardware requirements, limiting accessibility and scalability. This study presents a novel approach by developing an AR navigation system based on WebXR, utilizing marker-based tracking with Immersal SDK and 3D visualization through Mattercraft. The system delivers real-time historical information and directional guidance directly via mobile browsers, eliminating the need for additional installations. While previous research has explored AR for cultural tourism, this work is unique in offering a cross-platform, browser-based solution that enhances user accessibility across both iOS and Android devices. Functional testing revealed that iOS devices, especially older models with lower RAM, showed better performance compared to Android, indicating the significant role of device hardware in AR functionality. The system was effective up to 50 meters and at angles below 50°, with optimal lighting improving display quality. This study fills a critical gap in the AR field by demonstrating how WebXR can offer an accessible, scalable, and immersive

IMPLEMENTASI BOT TELEGRAM DENGAN MEKANISME REKAPITULASI BERKALA UNTUK MENGURANGI BEBAN NOTIFIKASI DAN MENINGKATKAN EFEKTIVITAS PEMANTAUAN JARINGAN

Zainal Arifin — 2025-11-27

Real-time internet network monitoring is crucial to ensure stable data communication, especially in environments with a large number of clients. This study develops a Telegram bot system equipped with an automatic 30-minute summarization feature to reduce excessive notification loads found in the previous system. The research follows a structured framework consisting of system analysis, solution design, system implementation, testing, and evaluation. The system was tested on a network with 380 active clients. The results show that the new system successfully reduced the average number of daily notifications from 120–200 to around 48 messages, improved technician response time from 15 minutes to 1 minute, and increased technician satisfaction from moderate to high. The summarization feature proved effective in simplifying incident reports without reducing information accuracy. This system is suitable for broader implementation to enhance the efficiency and effectiveness of network monitoring.

ANALISIS KEKUATAN PONDASI TOWING WINCH KAPAL AHTS 7600 HP DENGAN FEM

Siti Rahayuningsih — 2025-11-27

This study analyzes the structural strength of the towing winch foundation on an AHTS 7600 HP vessel due to changes in tensile strength specifications, employing the Finite Element Method (FEM). The change in specification occurs as a result of a towing winch vendor replacement during the ship construction phase, which has the potential to affect the foundation’s design and strength. FEM simulations are conducted to evaluate the structural response under both static and dynamic loading up to the maximum load limits. The analysis results indicate that, under various loading scenarios according to the new specification, the maximum stress experienced by the foundation remains below the safety factor as stipulated by BKI regulations. This study concludes that the existing foundation design is still capable of withstanding the loads resulting from the specification change and provides design improvement recommendations to ensure that the safety factors remain fulfilled during offshore operations.

KARAKTERISTIK CAMPURAN MORTAR BERBAHAN DASAR DRY STACK TAILING DAN STEEL SLAG

Reffianno B. Manuse — 2025-11-27

With the rapid development of infrastructure, it is important to explore innovative ways to utilize waste materials as substitutes for cement, a primary component in construction products. The objective of research is to reduce cement usage in mortar production for mortar applications by incorporating steel slag-a byproduct of iron processing-and tailings, which are waste materials from gold mining operations. This study focuses on examining the characteristics of mortar mixtures containing steel slag and tailings as a replacement of cement according to compressive strength, porosity and setting time tests. The percentage of tailing was set to be 15% and combined with steel slag with a percentage of 5%, 10%, and 15% by wt. of cement. The results show the influence of steel slag in compensating the use of tailing in mortar mixture. Furthermore, the blended tailing-slag binders is potential to be used in optimizing the industrial waste to partially replace cement in construction field especially for non-structural element application

PENGARUH VARIASI SALINITAS AIR LAUT TERHADAP LAJU KOROSI ALUMINIUM 5083 SEBAGAI MATERIAL LAMBUNG KAPAL

Rikky Leonard — 2025-11-27

SISTEM PENYEARAH SETENGAH GELOMBANG SATU FASA TANPA KONTROL MEMAKAI SUMBER AC TIGA FASA

Dwi Sasmita Aji Pambudi — 2025-11-27

This study discusses a single-phase half-wave uncontrolled rectifier using a three-phase AC generator. The rectification process is simulated using Proteus software, which displays a sinusoidal waveform to identify the behavior of the single-phase half-wave rectifier. The system uses a three-phase AC generator as the load, which is connected to the half-wave rectifier circuit. A half-wave rectifier is a system that uses a single diode block—either one diode or multiple diodes in parallel—to convert alternating current (AC) voltage into direct current (DC) voltage. Its operation is based on the unidirectional characteristic of diodes, allowing current to flow in only one direction. This type of rectifier is called “half-wave” because it only passes the positive half cycle of the AC signal. A generator is a device that converts mechanical energy into electrical energy, which can be driven by wind turbines, water turbines, or steam turbines. These turbines rotate the generator shaft to produce electricity through the coil inside the generator. An alternator is a type of generator that produces AC output voltage. As most current power systems use AC, alternators play a central role in power generation. Their size varies depending on the load capacity, especially in large-scale power plants.

REDUKSI RIPPLE DAN EVALUASI TEGANGAN PADA PENYEARAH SETENGAH GELOMBANG TIGA FASA BERBASIS KOMPONEN PASIF

Yudi Andika — 2025-11-27

The three-phase half-wave rectifier circuit employs diodes as passive rectifying components to convert a three-phase sinusoidal input into a half-wave output, where only the positive portions of each phase are conducted. When combined with an inductive element, the circuit allows current to continue flowing even after the load voltage drops to zero, since the inductor stores and releases energy. Experimental results show that the output DC voltage is approximately equal to the peak voltage of the transformer, reduced by about 0.7 V due to the forward voltage drop of the silicon diode. Furthermore, the presence of a capacitor in the RC load significantly reduces the ripple voltage, producing a smoother DC output. Measurements also revealed that the Avo-Meter displays the effective (rms) voltage, while the oscilloscope indicates the peak value of the waveform. During the measurement process, the internal resistance of the measuring instruments slightly influenced the results due to continuous current flow through the circuit. Overall, the study confirms that increasing the capacitance value effectively minimizes ripple, thereby improving the quality of the rectified DC output.

SISTEM DATA LOGGER SHMS BERBASIS LVDT DENGAN KALMAN FILTER UNTUK PENGUKURAN DISPLACMENT

Rika Novita Wardhani — 2025-11-27

This study presents the development of a prototype Structural Health Monitoring System (SHMS) aimed at measuring displacement in elastomeric bridge bearings using a Linear Variable Differential Transformer (LVDT) sensor integrated with a Kalman Filter. The system is designed to enable accurate, real-time, and reliable monitoring by mitigating signal noise commonly found in LVDT outputs. The prototype is composed of two primary components: a Data Acquisition Unit (DAQ) that reads displacement and transmits data via the MQTT protocol, and a Data Logger that processes the incoming signal using the Kalman Filter, stores it in CSV format, and displays real-time data through a web-based dashboard. The research methodology includes a literature review, mathematical modeling of the Kalman Filter, hardware design, and performance testing in a controlled laboratory environment. Experimental results demonstrate that a Kalman Filter configuration with parameters Q=1e-5 and R=0.01 significantly reduces measurement noise, yielding smoother displacement curves that closely align with micrometer reference data. The findings confirm the effectiveness of the system for monitoring structural displacement. The integration of LVDT sensors, IoT-based communication, and signal processing techniques in this prototype highlights its potential for practical implementation in infrastructure safety assessment.

TSUNAMI HAZARD LEVEL MAPPING USING GEOGRAPHIC INFORMATION SYSTEMS IN TRENGGALEK REGENCY

M. Rakif Panguale — 2025-11-27

Indonesia’s southern coastal regions, including Trenggalek Regency, are highly vulnerable to tsunamis due to their proximity to the active subduction zone along the Indian Ocean. Accurate hazard mapping is therefore crucial to support disaster risk reduction efforts. This study aims to analyze and map the tsunami hazard level in the coastal region of Trenggalek Regency using a spatial modeling approach based on Geographic Information Systems (GIS). The method integrates topographic slope, surface roughness, and tsunami wave height data to estimate inundation extent through a mathematical model that incorporates Hloss (wave height loss). The model outputs were used to generate a tsunami hazard index, ranging from 0 to 1, and classified into three hazard classes: low, medium, and high. The results indicate that coastal areas with flat terrain and low roughness coefficients such as settlements and rice fields in the districts of Watulimo, Panggul, and Munjungan are categorized as high hazard zones due to their vulnerability to wide-scale inundation. In contrast, forested or steep-sloped regions demonstrate limited inundation extents due to greater physical resistance. This spatial mapping provides essential information for disaster mitigation, coastal planning, and early warning system development in tsunami-prone areas.

ANALISIS KEGAGALAN THERMAL DEAERATOR VESSEL CAPACITY 15 M3

Moh. Miftachul Munir — 2025-11-27

ANALISIS KOROSI ELEKTRODA ALUMINIUM DAN TEMBAGA SERTA PENGARUHNYA TERHADAP KINERJA BIO-BATERAI

Nanda Tri Yuliani — 2025-11-27

STUDI KOMPARATIF TIMBULAN SAMPAH DI WILAYAH URBAN DAN SUBURBAN DI JAWA TIMUR

Milasari — 2025-11-27

Municipal solid waste generation poses a major environmental challenge in rapidly developing regions. This study compares daily waste generation between urban and suburban areas in East Java Province, Indonesia, using a quantitative approach with spatial analysis. Descriptive analysis was employed to examine waste generation patterns, Moran’s I was used to detect spatial autocorrelation, and Geographically Weighted Regression (GWR) was applied to assess localized socio-economic influences. The results reveal significant differences between urban and suburban areas. Major cities such as Surabaya and Malang produce higher per-capita waste compared to suburban areas including Pasuruan and Lamongan. Organic waste dominates overall composition, while urban areas exhibit higher proportions of plastic and paper waste. Spatial analysis identifies concentrated waste generation along the Surabaya–Sidoarjo–Gresik–Malang corridor, confirmed by significant Moran’s I values. GWR findings indicate spatially varying determinants: income strongly influences waste generation in core urban centers, population density plays a key role in transitional zones, and household size exerts greater effects in suburban areas. These findings emphasize the need for place-based policies and inter-regional collaboration to support sustainable waste management in East Java.

PEMETAAN ULANG PNJ DENGAN DRONE, GNSS, DAN BIM CIVIL 3D

Safri — 2025-11-27

This research was conducted to develop a remapping model for the Jakarta State Polytechnic (PNJ) Campus. This research was motivated by significant updates in campus infrastructure, such as the construction of new buildings and renovations, which have an impact on spatial planning, circulation, and accessibility. The objectives of this research are to identify significant changes in infrastructure development at PNJ and their impact on spatial planning, analyze the results of remapping coordinates using drone and GNSS technology, and model the PNJ remapping using the BIM (Civil 3D) platform. The stages of the research method include several steps: preparation, data collection by conducting drone surveys and GNSS measurements, data processing, field validation, accuracy testing, and map presentation. The targeted output of this research is a new map of PNJ equipped with contours and coordinates of each building, as well as technical documentation that can be used for campus planning and development purposes.

RESPON STRUKTUR BAJA DENGAN SISTEM RANGKA BREISING KONSENTRIS

Latifah Sahra Tiara — 2025-11-27

Bangunan dengan struktur baja memiliki daktilitas yang tinggi sehingga dapat dijadikan alternatif yang baik sebagai bangunan tahan gempa. Semakin tinggi suatu bangunan maka dibutuhkan suatu kekuatan dan stabilitas agar struktur memiliki respon yang baik. Pada struktur baja salah satu cara untuk mendapatkan respon struktur yang baik adalah penggunaan sistem rangka breising konsentris. Penelitian ini bertujuan untuk merancang detailing bangunan struktur baja dengan sistem rangka breising konsentris dan mendapatkan respon struktur meliputi perpindahan (displacement) tiap lantai dan simpangan antar lantai (story drift). Struktur dimodelkan dengan 2 model bangunan dengan penggunaan tipe breising yang berbeda. Bangunan tipe 1 dimodelkan dengan breising diagonal konsentris dan bangunan tipe 2 dimodelkan dengan breising invert v. Hasil analisis dari penelitian ini menunjukkan bangunan dengan tipe breising invert v memiliki displacement, story drift, dan gaya-gaya dalam yang lebih kecil dibandingkan bangunan dengan breising diagonal. Detailing pada bangunan dengan breising diagonal dirancang dengan mutu sambungan yang lebih tinggi dibanding breising invert v agar mandapatkan kuat perlu yang diinginkan

OPTIMASI KINERJA POMPA UNTUK PENGISIAN 4 TANGKI 1000 KL DENGAN FLOWRATE 70 KL/JAM

Septian Chandra Dwi Mulya — 2025-11-27

Fuel tank filling operations require efficient and reliable pumping systems, especially when handling large volumes in industrial or aviation fuel storage facilities. This study analyzes and optimizes the pumping process for filling four storage tanks, each with a capacity of 1,000 kiloliters (kl), using centrifugal pumps with a flowrate of 70 kl/h. Four operational scenarios were evaluated: the use of 1, 2, 3, and 4 pumps running simultaneously. Simulation results show that filling a single tank with one pump takes approximately 14.29 hours, resulting in a total time of 57.14 hours for all four tanks. The use of two or three pumps in parallel reduces total time by nearly 50%, while operating four pumps concurrently reduces the total filling time to just 14.29 hours. This paper concludes that parallel pumping configurations significantly improve time efficiency and operational flexibility, especially when supported by proper manifold design and flow control systems

IMPLEMENTASI MOTOR SERVO SEBAGAI KONTROL VALVE PADA ALAT PENGISIAN GULA CURAH KILOAN

Muhammad Haniv Karamy — 2025-11-27

Granulated sugar is a basic necessity for many Indonesians. It’s commonly sold in two types of packaging: branded and unbranded. Most lower-income households prefer unbranded sugar because it’s more affordable. Typically, producers distribute it in 50 kg sacks, and local retailers then sell it in smaller portions like 250g, 500g, 1kg, and 2kg. However, many vendors still rely on manual scales, which are less efficient and require constant adjustments to ensure accuracy. To solve this problem, this final project introduces an automatic bulk sugar dispenser using a servo motor and a load cell sensor. The system automatically controls a valve that opens when the sugar weight is below the target and closes when the desired weight is reached. By integrating a servo motor, the device improves the accuracy and efficiency of sugar packaging, making the process quicker and more practical. Integration testing confirmed that all components worked as intended. The system dispenses sugar precisely, the power supply meets the requirements, and the load cellprovides accurate readings. Ten test samples showed average weight errors of just 0.84% (250g), 0.54% (500g), 0.26% (1kg), and 0.35% (2kg).

MAPPING THE TURBIDITY DISTRIBUTION AROUND THE SAMBAS RIVER ESTUARY FROM LANDSAT 8 USING THE NORMALIZED DIFFERENCE TURBIDITY INDEX (NDTI)

Nurul Fatimah Yunita — 2025-11-27

Water turbidity is one of the commonly observed water quality parameters. In general, turbidity can be measured directly in the field. However, this method is not efficient when the observed area is relatively large. To make the measurement more efficient, remote sensing technology can be used. Turbidity measurements using this technology can apply the Normalized Difference Turbidity Index (NDTI) method. The input data analyzed in this case are Landsat 8 satellite images recorded in the years 2013, 2018, and 2024. The NDTI values in 2013 ranged from -0.093 to 0.004. In 2018, the values ranged from -0.107 to 0.048. In 2024, the NDTI index values ranged from -0.112 to 0.021. Index values closer to 1 indicate turbid conditions, while values closer to -1 indicate clearer conditions. In terms of spatial distribution, the NDTI index values in the Sambas river estuary area tend to indicate more turbid conditions compared to the river mouth and coastal areas. However, among these three types of areas, the coastal zone shows relatively clearer water conditions based on the observed NDTI values.

KONSTRUKSI KAPAL WISATA TIPE KATAMARAN BERBAHAN FRP UNTUK OPERASI DI PERAIRAN PULAU MENGARE KABUPATEN GRESIK

Mohammad Surya Adiansyah — 2025-11-27

Mengare Island in Gresik Regency has high marine tourism potential but still relies on modified fishing boats that do not meet proper safety and comfort standards. This study aims to design the construction of a catamaran-type tourist boat made of fiberglass reinforced plastic (FRP) suitable for shallow waters and to support local tourism development. The method includes laminate thickness calculation based on Indonesian Classification Bureau (BKI) rules, estimation of light weight tonnage (LWT), deadweight tonnage (DWT), total displacement, and determination of the ship’s center of gravity (LCG, TCG, VCG). The results show a laminate weight of 6,527.199 kg, LWT of 8,831.119 kg, DWT of 3,812.50 kg, and a total displacement of 12,643.619 kg. The calculated LCG, TCG, and VCG values serve as the basis for stability analysis. The construction drawings were prepared as a guideline to build a safe and comfortable tourist boat that supports marine tourism in Mengare Island.

ANALISIS PENGARUH INTERAKSI ENGINE PROPELLER MATCHING DALAM MENGOPTIMALISASIKAN PERFORMA PENGGERAK KAPAL IKAN

Pardi — 2025-11-27

With the rapid advancement of science and technology, fishing vessels have experienced significant development, particularly in their propulsion systems. This study addresses the selection of an effective and efficient propulsion system for a previously developed fishing vessel, with principal dimensions of Lpp = 7.798 m, B = 1.575 m, H = 0.678 m, T = 0.4 m, and a block coefficient (Cb) of 0.449. In operation, vessel speed is a crucial factor that greatly affects the effectiveness and success of fishing activities. Fishermen are required to reach fishing grounds as quickly as possible, especially under conditions influenced by tidal currents and the dynamic movement of fish schools. Therefore, an analysis of the propulsion system is essential to improve the performance of fishing vessels. To analyze performance, simulations were conducted using Computational Fluid Dynamics (CFD). Based on the simulation results, a resistance force of 1865 N at a speed of 10 knots requires an engine power of 28 HP. This performance was achieved using a DongFeng S1125 engine coupled with a B3-80 type propeller with a diameter of 0.34 meters.

INTEGRASI VISUAL COMPUTING UNTUK SISTEM PENGEREMAN ADAPTIF ROBOT INSPEKSI REL OTONOM

R. A. M. F. Natadisastra — 2025-11-27

The continuous operation of railway inspection systems over a 24-hour cycle necessitates the implementation of supporting technologies that can function optimally under all lighting conditions. This study develops an autonomous braking system powered by artificial intelligence and computer vision, incorporating Zero-DCE++ Night Vision enhancement, YOLOv8n object detection, and Human Pose Estimation on the LuminoLynx Inspection Robot. The system adopts a Stereo Vision triangulation approach for distance estimation and is integrated with an ESP32 microcontroller to enable real-time decision-making based on object proximity. Under low-light static testing, the system detected human objects with 100% accuracy, achieving the smallest distance error of 0.9 meters (3.37%) and a braking response within 3 seconds. For vehicle objects, the system yielded a confidence score of 0.62, a 3.61-meter error (36.1%), and a braking time of 6 seconds. These results confirm that integrating night vision and AI-based detection improves detection accuracy and braking responsiveness in low-light conditions. Although detection remained functional during dynamic testing, camera vibration reduced the precision of stereo matching, impacting distance estimation accuracy. Future improvements such as camera stabilization or depth sensor integration are recommended. This research contributes to advancing autonomous braking technology for nighttime railway inspections.

OPTIMASI VARIATIONAL QUANTUM CLASSIFIER (VQC) PADA KLASIFIKASI GAMBAR PERKEBUNAN KELAPA SAWIT

Desi Amirullah — 2025-11-27

This study explores the optimization of the Variational Quantum Classifier (VQC) for classifying plantation images, particularly distinguishing between oil palm and non-oil palm trees. Previous quantum models such as Quantum Convolutional Neural Networks (QCNN) demonstrated high accuracy but suffered from high complexity and qubit requirements. To address this limitation, this research employs a more modular and efficient quantum model, the VQC, optimized through the exploration of 18 combinations of feature maps (PauliFeatureMap, ZFeatureMap, ZZFeatureMap), ansatz circuits (RealAmplitudes, TwoLocal, EfficientSU2), and optimizers (COBYLA, SPSA). The dataset comprises 220 images resized to 32×32 pixels and preprocessed through standard scaling, PCA (to 4 dimensions), and normalization to [-1,1]. The best performance was achieved using the combination of ZZFeatureMap, EfficientSU2, and COBYLA, yielding an accuracy of 93%. Evaluation metrics include accuracy, precision, recall, F1-score, and specificity. The results reveal that the selection and interaction of feature map, ansatz, and optimizer significantly affect classification performance. These findings suggest that VQC is a promising alternative for image classification in digital agriculture, offering high accuracy with lower quantum resource demands.

STUDI NUMERIK PENGARUH VARIASI CHORD BILAH TERHADAP PERFORMANSI TURBIN ANGIN HORISONTAL

Nu Rhahida Arini — 2025-11-27

Wind energy is one of the most promising renewable resources, harnessed through turbines and generators to produce electricity. Theefficiency of this energy conversion strongly depends on the aerodynamic performance of the turbine blades, which generate lift and drag forces. This study presents a numerical investigation on a modified Horizontal Axis Wind Turbine (HAWT) blade using Computational Fluid Dynamics (CFD) to enhance overall performance. The modifications are incoporated on NACA 0015 airfoils with non-uniform chord lengths and twist angles. The simulations are conducted using OpenFOAM to analyze two blade design variations, imcluding the original/unmodified NACA 0015 airfoil. Key performance indicators such as lift coefficient (C_L), drag coefficient (C_D), pressure contours, velocity distribution, and streamline flow patterns are evaluated to assess the effectiveness of modification. The results show that blades with non-uniform chord and twist angle distribution can improve power output by up to 19.8%. Furthermore, the study introduces the concept of blade localization for adaptive manufacturing and tolerance control, paving the way for more precise and efficient turbine production.

SISTEM DETEKSI JATUH PADA LANSIA DENGAN NOTIFIKASI TELEGRAM

Muhamad Nasir — 2025-11-27

In 2024, 12 percent of Indonesia's population, or approximately 33 million people, are elderly—a number that continues to increase each year. Elderly individuals often experience physical limitations, making them more vulnerable to falls. Falling is a common problem among older adults, frequently leading to injury or even death. Continuous supervision is crucial for elderly people who are at high risk of falling. However, it is not always possible for family members to be physically present at all times to monitor them directly. Therefore, remote monitoring using current technology can be a viable solution.This study aims to develop a prototype for a fall detection monitoring system for the elderly using the MPU-6050 sensor, which integrates an accelerometer and gyroscope, along with NodeMCU as the controller for transmitting movement data. The system processes acceleration and orientation data on the X, Y, and Z axes from the accelerometer and gyroscope to differentiate between normal activities and falling incidents. When a fall is detected, the system sends a real-time Telegram notification directly to family members.

PERANCANGAN SISTEM PENGUJIAN FUNGSIONALITAS UNTUK MODUL CONTROLLER LAMPU HEMAT ENERGI

Sayyidhatus Az-Zahra — 2025-11-27

A testing device is required by the industry to ensure product quality through accurate and reliable testing of critical components in energy-saving lamp products. This research method includes the design phase of the testing device and the development of a measurement circuit focused on voltage, current, and power parameters in the energy-saving lamp controller module. The design of the electronic system for voltage and current sensors involves the use of voltage divider circuits, shunt resistors, and the ADS1115 component as an analog-to-digital converter (ADC). Additionally, optocouplers and relays are used as part of the switching and circuit protection system. The 24-volt voltage sensor is designed to measure a voltage range of 17 to 24 volts, the 8-volt voltage sensor to measure a range of 4 to 8,4 volts, and the current sensor to measure a current range of 150 mA to 470 mA. Based on testing results, the 24-volt voltage sensor showed an average error of 0,009%, the 8-volt voltage sensor 0,008%, and the current sensor 0,07%. Therefore, this testing device can be utilized to improve the efficiency of the production process and ensure the consistent quality of the energy-saving lamp controller module.

ANALISIS GETARAN PAKSA PADA TURBIN UAP UNTUK EVALUASI KEANDALAN MENGGUNAKAN METODE KUANTITATIF

Nu Rhahida Arini — 2025-11-27

A steam turbine operates at high rotational speed, generating significant centrifugal forces that can induce vibrations and lead to failures such as fatigue, ultimately reducing its reliability. This study aims to enhance steam turbine reliability through a forced vibration analysis approach, which includes vibration monitoring and selecting an appropriate maintenance strategy using a quantitative method implemented in GNU Octave. For a steam mass flow rate of 187.09 t/h, the dominant vibration frequency of 33.8 Hz is close to the system’s natural frequency of 31.8 Hz, indicating a high risk of resonance. Maintaining the flow rate between 211 t/h and 243 t/h effectively shifts the dominant frequency away from the natural frequency, reducing this risk. Based on the load condition, the remaining service life is estimated at 5.3 years, with predictive maintenance identified as the most suitable strategy.

KINERJA SISTEM MONITORING SCADA PADA PLANT SISTEM PENDINGIN DAN AHU

Anggi Zefanya Manurung — 2025-11-27

This research discusses the design and implementation of a Supervisory Control and Data Acquisition (SCADA) system for centralized monitoring of cooling systems and Air Handling Units (AHU) that previously operated separately. This integration aims to improve monitoring efficiency and facilitate real-time supervision. This research covers the design of the SCADA display, communication configuration using the Modbus TCP/IP protocol, and the implementation of alarm and alarm data logger features. Testing was conducted by comparing temperature parameter data between SCADA and the plant HMI to measure the level of accuracy. The test results showed 100% accuracy for all parameters tested, indicating that the system has high reliability in data acquisition. Additionally, the SCADA system can respond quickly to various disturbances and automatically log all alarms into a database. With these features, the system offers benefits in early disturbance detection, integrated monitoring data, and historical documentation useful for evaluation. Overall, SCADA has proven effective in enhancing the performance and efficiency of the HVAC system monitoring system as a whole.

RANCANG BANGUN GATEWAY LoRa UNTUK SMART AQUACULTURE

Mohamad Fathurahman — 2025-11-27

This study developed a Smart Aquaculture system using Long Range (LoRa) communication, applied at the Fish Hatchery Center (BBI) Ciganjur. The system is designed to monitor and control pond water quality in real-time, efficiently and integratively, supporting modern and sustainable aquaculture management. The transmitter uses an Arduino Mega 2560 equipped with pH, turbidity, TDS, and temperature sensors, along with actuators such as pumps, heaters, and cooling fans. The receiver uses an ESP32 connected to a MySQL database for data storage and processing. The system operates at a range of up to 1.3 km in Line of Sight (LOS) conditions and 500 meters in Non-Line of Sight (NLOS). Test results show that the pH sensor recorded averages of 4.06 (acidic) and 6.98 (alkaline), with a maximum error of 2.34%. The temperature sensor recorded 27.23°C (normal), 24.15°C (cold), and 29.18°C (hot), with a maximum error of 1.25%. TDS values were 144.28 ppm (mineral water), 82.84 ppm (refill), and 201.96 ppm (tap water) with a maximum error of 5.48%. Turbidity levels identified clear (0.00 NTU), cloudy (135.12 NTU), and very cloudy (300.00 NTU) conditions. Data is transmitted every 30 minutes. The system proved accurate, reliable, and suitable for IoT-based aquaculture.

ANALISIS PENGARUH RADIUS FILLET TERHADAP KONSENTRASI TEGANGAN PADA POROS TRANSMISI BAJA AISI 1040

Firman Alhaffis — 2025-11-27

Shafts are crucial components in mechanical transmission systems that transfer power between moving machine elements. In high-speed applications, shafts experience dynamic and cyclic loads that can trigger material failure due to fatigue, especially in cross-sectional areas such as stepped shafts. Stress concentrations that occur in diameter transition areas can be the starting point for cracking that leads to structural failure. One method to reduce these stress concentrations is by applying a fillet radius to the diameter change area. This study aims to analyze the effect of fillet radius on torsional and bending loads on a transmission shaft made of AISI 1040 steel. The method used is a numerical simulation based on Finite Element Analysis (FEA). It was found that the application of an 11 mm fillet radius on the stepped shaft provided better performance compared to a 1 mm fillet radius for a diameter transition from 190 mm to 150 mm. The use of an 11 mm fillet radius on the stepped shaft made of AISI 1040 material resulted in a decrease of total deformation by 1.8%, equivalent elastic strain by 4.24%, and, most notably, equivalent elastic stress by 75%.

RANCANGAN SISTEM KLASIFIKASI KENDARAAN BERBASIS KAMERA UNTUK ANALISIS DAMPAK LALU LINTAS LINGKUNGAN KAMPUS

Muhammad Asep Subandri — 2025-11-27

Traffic congestion in campus environments frequently leads to delays, safety risks, and increased pollution. This study aims to design and test a vehicle classification system based on Power over Ethernet (PoE) cameras utilizing the YOLOv8 algorithm for real-time traffic monitoring in a campus setting. The system integrates edge computing for vehicle detection and classification, coupled with cloud-based dashboard visualization for long-term data analysis. Initial testing was conducted on a residential street as a simulation, using a PoE camera with a resolution of 1920×1080 pixels and a frame rate of 30 fps. The results demonstrated the system’s ability to detect and classify cars and motorcycles with confidence scores ranging from 0.51 to 0.79, identifying a total of 12 vehicles (2 cars and 10 motorcycles) over a 30-minute observation period. The average processing latency of 80 ms supports real-time operation, although challenges such as occlusion and low-speed estimation require further refinement. This study highlights the system’s potential to enhance campus traffic management, with recommendations for future development including model training with local datasets, testing under varied conditions, and integrating predictive analytics.

ARSITEKTUR CHATBOT UNTUK KONSULTASI AKADEMIK DENGAN PENDEKATAN NLP TRANSFORMER

Fajri Profesio Putra — 2025-11-27

Layanan konsultasi akademik di perguruan tinggi sering kali menghadapi tantangan seperti keterbatasan waktu operasional dan beban kerja staf yang tinggi. Penelitian ini bertujuan merancang arsitektur chatbot berbasis pendekatan Natural Language Processing (NLP) Transformer untuk mendukung konsultasi akademik yang efisien dan mudah diakses. Menggunakan pendekatan Design Science Research, penelitian ini melibatkan analisis kebutuhan, identifikasi komponen arsitektur, dan pengembangan rancangan sistem. Arsitektur yang dihasilkan mencakup antarmuka pengguna, modul pemrosesan bahasa berbasis NLP Transformer, basis pengetahuan, dan sistem backend yang terintegrasi dengan sistem informasi akademik (SIA) kampus. Rancangan ini mendukung bahasa Indonesia dan memungkinkan akses informasi real-time, seperti jadwal kuliah dan peraturan akademik, dengan operasional 24/7. Hasil penelitian menunjukkan bahwa arsitektur ini menawarkan efisiensi, aksesibilitas, dan fleksibilitas untuk kebutuhan kampus Indonesia. Penelitian ini memberikan panduan desain bagi pengembangan chatbot akademik dan merekomendasikan pembuatan prototipe serta pengujian dengan pengguna nyata sebagai langkah lanjutan.

EVALUASI PERUBAHAN KEPADATAN RELATIF TANAH PASIR YANG DIPERKUAT TIANG HYBRID BERBASIS PENGUJIAN SHAKING TABLE

Muhammad Yunus — 2025-11-27

Earthquakes have the potential to trigger changes in the physical properties of soil, one of which is the relative density value. This parameter is crucial for determining the shear strength of soil, its resistance to liquefaction phenomena and the stability of soil masses when subjected to dynamic loading. This study aims to evaluate changes in the relative density of saturated sand soil reinforced with hybrid piles as a result of cyclic acceleration loading via shaking table testing. A physical model was constructed in a test bed comprising a 600 mm-thick layer of sandy soil, divided into six 100 mm-thick layers with an initial relative density of 40%. Testing involved inputting sinusoidal waves with accelerations of 0.3 g, 0.4 g and 0.5 g at a constant frequency for 60 seconds. The variation in void ratio at each layer depth was analysed to represent the change in relative density due to the loading cycle. The test results showed that using hybrid piles increased the relative density values in saturated sand soils, effectively reducing the degradation of soil strength caused by cyclic acceleration loading. This finding could serve as a reference for developing soil reinforcement methods to mitigate liquefaction in earthquake-prone areas.

DAYA KEMBANG, KADAR ABU DAN SIFAT SENSORI COOKIES SUBSTITUSI TEPUNG PISANG TERMODIFIKASI

Zukryandry — 2025-11-27

This study aimed to evaluate the effect of modified banana flour substitution on the spread ratio, ash content, and sensory properties of banana cookies. The formulations were prepared with varying ratios of modified banana flour and wheat flour (20:80, 40:60, 60:40, 80:20, and 100:0). The results showed that the substitution of modified banana flour affected the spread ratio of cookies, with values ranging from 0.23 to 0.27 cm. Ash content increased along with the proportion of banana flour, from 1.24% in the 20:80 formulation to 1.59% in the 100:0 formulation, and all values met the Indonesian National Standard (SNI) requirement for cookies (<2%). Sensory evaluation revealed an increasing trend in color, aroma, taste, and texture scores as the proportion of banana flour increased, with the highest scores obtained in the 100:0 formulation. These findings indicate that modified banana flour can be used as a substitute for wheat flour in cookie production, providing competitive physical and sensory quality characteristics.

SISTEM KENDALI ELEKTRONIK MOTOR BLDC PADA MOBIL LISTRIK

Jefri Lianda — 2025-11-27

The BLDC motor control system with practical speed control is designed to drive BLDC motors commonly used in electric vehicle systems. This system primarily functions to control the direction of motor rotation—both forward and reverse—and to regulate throttle input for speed control. The research focuses on utilizing an efficient and practical speed control mechanism, aiming to optimize motor responsiveness and collect experimental performance data. The Convenient Speed Control device operates as expected. It successfully controls the BLDC motor, allowing the vehicle to move forward and reverse, and enables manual throttle regulation. Voltage output while moving forward is higher than when in reverse. At full forward speed, the measured voltage reaches up to 38 volts, while in full reverse, it only reaches 21 volts. Additionally, testing at different speed levels showed a clear increase in phase voltage with higher speeds. At Speed 1, the average phase voltage is around 8 volts. At Speed 2, it increases to approximately 17 volts. Finally, at Speed 3, the highest voltage is recorded, with all phases averaging 21 volts. These results demonstrate that the controller responds proportionally to speed changes and performs well in regulating the motor under different driving conditions.

AKTIVITAS ANTIMIKROBA LIMBAH CAIR PENYULINGAN MINYAK ATSIRI PALA TERHADAP BAKTERI Eshericia Coli

Widia Rini Hartari — 2025-11-27

Lampung Province is one of the nutmeg intensification areas from the Ministry of Agriculture, so it has the potential to be developed and become a superior product if seen from the 3rd largest production from Sumatra Island. The nutmeg processing industry into essential oil is also quite developed in the Pesawaran and Tanggamus areas, but it is still processed from the seeds and mace. Whereas other parts, such as nutmeg leaves and waste from nutmeg essential oil distillation, can be processed into products with high sales value. This study aims to obtain antibacterial activity of nutmeg distillation wastewater against Escherichia coli bacteria. The research method was compiled using RAKL with further BNT tests with wastewater concentrations of 25, 50, 75, and 100%. The results showed that each concentration was significantly different and had bacterial inhibition starting from the smallest concentration of 25%.

PENGEMBANGAN MESIN PEMILAH PADI DARI GABAH KOSONG DENGAN PENDEKATAN QFD (QUALITY FUNCTION DEPLOYMENT) UNTUK PETANI BENGKALIS RIAU

Razali — 2025-11-27

Alat ini dirancang bangun dengan memperhatian pendekatan QFD dengan tujuan untuk memisahkan butir padi yang baik dari gabah kosong atau kotoran. Alat pemisah padi dan gabah adalah salah satu inovasi sederhana dan terjangkau produktif dan efisien. Alat ini bekerja berdasarkan perbedaan berat atau ukuran antara padi dan gabah, sehingga komponen-komponen yang tidak diinginkan dapat dipisahkan. Alat ini menggunakan sistem angin untuk memisahkan padi yang berkualitas baik dari gabah, sekam, dan kotoran lainnya Berdasarkan data House of Quality (HOQ), diperoleh 5 urutan prioritas untuk pengembangan desain rancang bangun mesin pemilah padi dari gabah kosong dengan pendekatan QFD (Quality Function Deployment) yaitu pada Rangka kokoh, kaki dengan peredam getaran dengan nilai 11 %, Material rangka baja karbon rendah (ST-37 atau sejenis) dengan nilai 10%, Menggunakan profil L dengan nilai 10%, Plat hopper tebal 1,5 mm dengan nilai 96%, Kapasitas penampungan hopper minimal 250 Cm3 dengan nilai 9.2%. dan berdasarkan penilaian konsep (concept scooring) pada konsep alternatif kedua yang memiliki Total Score tertinggi yaitu sebesar 3,614 dibandingkan dengan dua konsep lainya. Oleh karena itu pada konsep alternatif Kedua di terima oleh petani untuk sebagai Mesin Pemilah Padi Dari Gabah Kosong dan akan di lanjutkan ke tahap berikutnya yaitu penegmbangan konsep

KARAKTERISTIK FISIKOKIMIA DAN SENSORI TEH CASCARA DARI KULIT BUAH KOPI ROBUSTA DAN ARABIKA PADA BERBAGAI TINGKAT KEMATANGAN

Maryanti — 2025-11-27

Cascara tea is a drink made from dried coffee skin that has a unique taste with fruit and floral aromas, and has the potential as a functional beverage. The type of coffee and the level of ripeness of the fruit affect the quality and sensory properties of cascara. Therefore, research on cascara from robusta and arabica coffee types and the level of ripeness of the fruit is important to obtain cascara tea that has high quality and delicious taste and can be accepted and liked by consumers. The study used a Randomized Block Design (RBD) with 3 replications. The treatments given were coffee varieties (arabica and robusta) and the comparison of the level of ripeness of the coffee fruit (100% red, 100% yellow, 100% green, 50% red + 50% yellow, and 40% red + 30% yellow + 30% green). Based on the research results, the best treatment was the robusta coffee variety with a red coffee fruit ripeness level that produced a water content of 3.02%, a pH value of 5.82, a balanced blend of sweet, sour, astringent and bitter flavors, a brownish yellow color, a distinctive tea aroma, and overall acceptance of liking.

STUDI KOMPARATIF METODE SAND BLASTING DENGAN BONDING AGENT DAN PERKUATAN WIREMESH PADA PERBAIKAN SELIMUT BETON

Andi Isdyanto — 2025-11-27

This research compares two repair methods for concrete cover spalling due to rebar corrosion: the Sand Blasting with Bonding Agent method and the Wiremesh Reinforcement method. The main objective is to evaluate the mechanical performance, bond strength (adhesion), and durability of the repaired concrete specimens. A quantitative experimental approach was used, creating and artificially damaging concrete beam specimens to simulate the damage. The damaged specimens were then repaired using the two methods. The first method involved cleaning the surface with sand blasting and applying a bonding agent before patching. The second method used wiremesh as external reinforcement, installed with anchors before applying the repair mortar. Both sets of repaired specimens were then comprehensively tested, including compressive strength, flexural strength, and bond strength tests. The results show that both methods significantly restore the structural integrity of the damaged concrete. However, the wiremesh reinforcement method demonstrated superior performance in enhancing the flexural strength and shear capacity in the repaired areas. Meanwhile, the sand blasting with bonding agent method showed excellent bond strength and was effective for more superficial damage. The study concludes that the sand blasting method is ideal for repairing local, non-structurally critical spalling, while the wiremesh method is more suitable for large-scale damage requiring increased structural capacity and crack resistance.

SISTEM PENGATURAN MOTOR SATU FASA PADA MESIN PENGADUK BUBUR KERTAS

Agustiawan — 2025-11-27

The excessive use of paper has led to an increase in waste paper, posing significant environmental concerns. Recycling used paper is an effective solution, with pulp processing being one of its key stages. To improve the efficiency of this process, a continuous mixing system is required. This study presents the design and implementation of a semi-automated pulp mixing system using a single-phase motor as the main actuator, controlled by a Programmable Logic Controller (PLC) with an open-loop configuration. Experimental results show that under no-load conditions, the system achieves an average motor speed error of 1%, indicating a high level of measurement accuracy. However, when operating under load (mixing paper pulp), the average motor speed decreased to 43.6%, demonstrating that mechanical load has a considerable impact on system performance

ANALISIS PENGARUH RADIASI GELOMBANG ELEKTROMAGNETIK PADA OPERATOR DITINJAU DARI KESEHATAN DAN KESELAMATAN KERJA (K3)

Duma Pabiban — 2025-11-27

Electromagnetic radiation plays an important role in the clinical field but also poses health and safety risks to equipment operators. This study aims to determine the level of electromagnetic radiation exposure in the Radiology Unit of General Hospital X and analyze its effects on operator health. The research used a quantitative approach with data obtained from measurements using an Electromagnetic Field Tester (Geiger Muller) and questionnaires distributed to radiology operators with a Likert scale. Data validity and reliability were tested before analysis using SPSS V.26. The results showed that the use of electronic devices had no significant effect on operator health (p = 0.532 > 0.05), while operator behavior (p = 0.004 < 0.05) and the implementation of Occupational Health and Safety (K3) practices (p = 0.006 < 0.05) significantly affected health. The F-test showed a combined significant effect (p = 0.015 < 0.05). Measured exposure levels were 3.06 µT for CT Scan, 0.28 µT for X-ray, and 0.04–0.79 µT for Panoramic machines, all below the ICNIRP safety limit of 500 µT. Consistent safety practices and maintaining a minimum 2-meter operating distance are essential to reduce radiation risk

EVALUASI HASIL TANAMAN KACANG TUNGGAK DI LAHAN SEED TEACHING FARM POLITEKNIK NEGERI LAMPUNG

Anung Wahyudi — 2025-11-27

Cowpea is a plant that is a very important food commodity in national food security. The availability of superior varieties is the basis for increasing production. The yield test of cowpea is part of the stages of the plant breeding process before the registration process for new superior varieties. This study aims to test the yield of seven cowpea genotypes and determine productivity using statistical analysis. The materials used in this study were four test genotypes (Albina, Tampi, Uno, and Arghavan) with three comparison genotypes (KT-1, KT-7, and KT-9). The design used was a Randomized Complite Block Design (RCBD) with one factor, namely cowpea genotypes. The study used four replications, so there were 28 experimental units. Observations were made on quantitative and qualitative characters. The results showed that the Tampi genotype had the highest yield of young pods (0,98 ton.ha-1) compared to other genotypes. Based on statistical analysis, the Albina and Arghavan genotypes had significantly different seed productivity values (4,52 and 4,26 ton.ha-1) compared to the comparison genotypes (KT-1, KT-7, and KT-9). This study became the yield data of the second generation of cowpea which was tested in the Seed Teaching Farm, Politeknik Negeri Lampung.

PENERAPAN BIM DALAM PERCEPATAN PEMBANGUNAN ASRAMA MAHASISWA NUSANTARA MANADO

Fardi Kalumata — 2025-11-27

The construction project for the Asrama Mahasiswa Nusantara (AMN) Manado began on December 27, 2023, with a completion time of 247 days. The project is located in Desa Kalasey Dua, Kecamatan Mandolang, Kabupaten Minahasa, Provinsi Sulawesi Utara. The project's owner, PT. Widya Satria, has been tasked with implementing Building Information Modelling (BIM) in the construction process, using BIM 3D, BIM 4D, and BIM 5D. The research methodology used is a literature study and BIM modeling to provide critical work performance data using fast track methods. The results of the analysis are then analyzed using BIM to determine the volume of work, material, and time. BIM implementation using Autodesk Revit and MS-Project helps in reducing the need for resources, such as labor and materials. BIM also facilitates clash detection, allowing the modeling and work schedule to be coordinated and work together. Visual simulations of the project's work progress show that progress is increasing at different stages, with the first stage reaching 3%, the fourth stage reaching 17%, the eighth stage reaching 28%, and the final stage reaching 100%.

The project's implementation resulted in a 12.5% increase duration work from the previous 247 days to the new 217 days

BROILER PERFORMANCE IN CLOSE HOUSE SYSTEM

A. A. Candra — 2025-11-27

This study aims to evaluate the performance of broiler chickens in House 1 at PT. ABC. The background of this research is the increasing consumption and production of broiler chickens in Lampung Indonesia, which necessitates performance evaluation to ensure feed efficiency and successful production. The evaluation was conducted by analyzing key parameters such as feed consumption, feed conversion ratio (FCR), average body weight at harvest, average age at harvest, depletion percentage (mortality rate), and performance index (IP). The research methods included observation, interviews, direct participation, and literature review over two rearing period. The results showed that the performance index of broiler chickens in Cage 1 during period 28 was 400.3 and during period 29 was 417.3 can still be improved, especially in terms of feed efficiency and mortality management. The performance index values were compared with company standards to measure the level of production success. In conclusion, routine performance evaluation is essential to identify obstacles and improve rearing results in subsequent periods. The study suggests improving management practices, optimizing feed administration, and consistently implementing standard operating procedures (SOP) to achieve optimal broiler production performance.

PENGARUH KEMIRINGAN SUDUT PADA PENGUKURAN BOLLARD PULL TEST: MODEL MATEMATIS DAN KOREKSI BIAS UNTUK AKURASI PENGUJIAN

Rachmad Tri Soelistijono — 2025-11-27

Bollard Pull Test (BPT) adalah metode penting untuk mengukur kapasitas tarik kapal, terutama tugboats, yang digunakan dalam berbagai operasi maritim seperti berlabuh dan menarik kapal. Meskipun pengujian ini sangat krusial, sering kali diabaikan pengaruh kemiringan sudut antara kapal dan bollard, yang dapat menyebabkan bias pengukuran yang signifikan. Penelitian ini mengembangkan model matematis untuk mengukur dan mengoreksi bias yang disebabkan oleh kemiringan sudut vertikal dan horizontal selama pengujian Bollard Pull. Dengan memperhitungkan pengaruh sudut ini, kami menunjukkan bagaimana koreksi sudut yang tepat dapat menghasilkan pembacaan daya tarik yang lebih akurat, yang sangat penting untuk perencanaan operasi pelabuhan, desain kapal, dan efisiensi sistem propulsi. Simulasi yang dilakukan mengungkapkan bahwa tanpa koreksi, bias dapat mencapai lebih dari 10%, yang mempengaruhi keputusan desain kapal dan penggunaan tugboats. Temuan ini memberikan wawasan baru tentang pentingnya koreksi sudut dalam pengujian Bollard Pull untuk memastikan hasil yang lebih representatif dan aman dalam operasi maritim. Penelitian ini tidak hanya memperkaya kajian teknis pengujian bollard pull tetapi juga berkontribusi pada pengembangan teknologi maritim modern untuk meningkatkan efisiensi dan keberlanjutan operasi pelabuhan.

KONVERSI SAMPAH PERKOTAAN MENJADI ENERGI LISTRIK: TINJAUAN TEKNOLOGI, PELUANG, DAN TANTANGAN DI INDONESIA

Urip Mudjiono — 2025-11-27

Urbanisasi pesat di kota-kota Indonesia meningkatkan timbulan sampah sekaligus menekan kapasitas TPA dan kebutuhan listrik, sehingga mendorong evaluasi waste-to-energy (WtE) sebagai solusi integratif. Artikel ini menyajikan review deskriptif (narrative) atas publikasi ilmiah dan dokumen kebijakan periode 2019–2025 untuk menilai kesesuaian teknologi konversi sampah menjadi listrik, kelayakan finansial–institusional, dan tantangan implementasi pada konteks Indonesia. Sintesis menunjukkan bahwa pembakaran langsung (incineration) paling matang secara komersial tetapi mensyaratkan pemilahan di sumber, fuel conditioning (pengeringan/RDF), dan pengendalian emisi berlapis; digestasi anaerobik sesuai dengan dominasi fraksi organik basah dan efektif untuk konfigurasi terdesentralisasi berbasis CHP; sedangkan gasifikasi dan pirolisis menjanjikan pada skenario RDF/plastik dengan spesifikasi bahan bakar yang ketat. Pemilahan di sumber konsisten meningkatkan mutu umpan dan kinerja lingkungan; kelayakan finansial sangat dipengaruhi kombinasi tipping fee, struktur PPA dan kepastian offtake, serta penetapan standar RDF/emisi dan mekanisme pengadaan yang jelas; sedangkan penerimaan sosial bergantung pada transparansi data emisi dan pelibatan pemangku kepentingan. Implikasi praktisnya adalah model implementasi bertahap: klaster digestasi anaerobik di kawasan timbulan organik tinggi yang terintegrasi dengan peningkatan residu menjadi RDF untuk memasok rute termal kota, ditempatkan dalam kerangka ekonomi sirkular yang menegaskan prioritas 3R dan meminimalkan ketergantungan pada TPA.

IMPLEMENTASI DEEP LEARNING MENGGUNAKAN LIBRARY TENSORFLOW DAN APPLICATION PROGRAMMING INTERFACE KERAS UNTUK KLASIFIKASI MULTI-OBJEK FOTO

Sahid Triambudhi — 2025-11-27

Perkembangan deep learning mendorong pemanfaatannya dalam klasifikasi citra karena mampu mengenali pola visual dengan akurasi tinggi. Penelitian ini bertujuan mengembangkan aplikasi berbasis web untuk klasifikasi multi-objek pada foto dua dimensi. Sistem dirancang menggunakan Python, TensorFlow, dan API Keras, dengan alur kerja pengiriman citra melalui AJAX dari client ke server TensorFlow, lalu menampilkan hasil klasifikasi secara real-time. Proses pengembangan mengikuti kerangka kerja scrum, melalui tahapan sprint, backlog, dan review agar adaptif terhadap perubahan kebutuhan. Pengembangan dibatasi pada jaringan privat menggunakan NAT atau firewall, serta terhubung ke internet melalui Ngrok tunnel. Hasil penelitian menunjukkan sistem mampu mengidentifikasi beberapa objek sekaligus, menampilkan nama serta tingkat akurasinya (%). Rekomendasi pengembangan selanjutnya meliputi integrasi perangkat keras (kamera/webcam), dukungan jaringan publik, klasifikasi lebih spesifik seperti “umur” atau “penyakit”, serta perluasan format input termasuk dokumen Word dan PDF.

PERANCANGAN USER INTERFACE (UI) YANG AMAN PADA DOCUMENT TRACKING SYSTEM MELALUI PROTOTYPING

Rezki Kurniati — 2025-11-27

Document Tracking Systems (DTS) are crucial for managing administrative processes, yet they face significant security risks like data breaches and unauthorized access, which can be worsened by a poor user experience. This research aims to design a secure and intuitive User Interface (UI) for a Document Tracking System through an iterative prototyping approach to improve both work efficiency and security. The design is built upon five fundamental security pillars: Confidentiality, Availability, Authentication, Authorization, and Accountability. The system was developed using PHP and JavaScript. The results demonstrate a successful implementation of key security features, including a secure login page with a brute-force mitigation mechanism that locks an account for three minutes after three failed attempts. Furthermore, a role-based access control system effectively restricts user access to menus and functionalities according to their designated roles. Functional evaluation confirmed that all security mechanisms work as designed. This study concludes that the iterative prototyping method is effective in developing a secure, user-friendly DTS that protects information while ensuring a positive user experience.