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Mochamad Sulaiman
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G-Tech : Jurnal Teknologi Terapan
Published by Universitas Islam Raden Rahmat Malang
ISSN : 25808737     EISSN : 2623064X     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering
Jurnal G-Tech bertujuan untuk mempublikasikan hasil penelitian asli dan review hasil penelitian tentang teknologi dan terapan pada ruang lingkup keteknikan meliputi teknik mesin, teknik elektro, teknik informatika, sistem informasi, agroteknologi, dll.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 897 Documents
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Reduction of Cu and Cr Metal Content in Electroplating Industrial Liquid Waste Using the Ion Exchange Method Tsabitah Nabilah Khairunnisa; Yesi Nabila Zahro Herazi; Rachmad Ramadhan Yogaswara; Mu’tasim Billah; Nurul Widji Triana
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7374

Abstract

Electroplating industrial waste contains toxic chemicals that pose risks to health and environment, especially if they enter household wastewater systems. Therefore, treatment is necessary to reduce heavy metal content using the ion exchange method. This study utilized Amberlite IR 120Na resin as the ion exchange medium in electroplating waste. This study aims to reduce metal content in electroplating industrial wastewater using the ion exchange method by evaluating the effects of resin height and flow rate. The process was conducted with variations in flow rate (100 ml/min, 200 ml/min, 300 ml/min, 400 ml/min, 500 ml/min) and resin height (3 cm, 6 cm, 9 cm, 12 cm, 15 cm). The waste was passed through the ion exchange column, and the remaining Cu and Cr metal concentrations were measured. The results indicated that the optimal conditions occurred at a flow rate of 100 ml/min and a resin height of 15 cm, achieving a reduction of Cu metal by 90.16% and Cr metal by 83.36%. The Cu concentration after the process met quality standards under all conditions, while the Cr concentration met quality standards at resin heights of 12 cm and 15 cm. The ion exchange method proved effective in reducing heavy metal pollution.
Exploring Indonesian Traditional Sticky Rice Based Snacks: A Systematic Review Nur Agustin Mardiana
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7377

Abstract

In Indonesia, glutinous rice is a fundamental ingredient in a wide array of traditional snacks. Despite its cultural importance, there is a notable lack of comprehensive academic reviews specifically addressing traditional Indonesian snacks made from glutinous rice flour. To address this gap, the present study aims to identify and categorize various traditional snacks derived from glutinous rice, while also examining their cultural significance within local communities. A systematic approach was employed, utilizing keyword searches and Boolean phrase logic to gather relevant data. Sources included books, peer-reviewed journals, reputable websites, and other forms of online literature. The study identified 44 food out of 200 papers made from glutinous rice. Beyond their function as consumables, these culinary products are deeply woven into the fabric of Indonesian culture, often playing central roles in religious ceremonies, traditional rituals, and other cultural practices.
Comparison of Manning's Roughness Coefficient Estimation Methods Based on Channel Geometry and Bed-Load Sediment Characteristics in the Way Tapus River Ayudia Hardiyani Kiranaratri; Miskar Maini
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7378

Abstract

Natural and artificial rivers contain bed-load sediment materials with varying shapes and grain sizes influencing flow resistance, velocity, and discharge. This resistance is expressed by the Manning roughness coefficient (n), whose accurate estimation is essential for hydraulic analysis. While n is commonly obtained from Manning’s table, alternative methods based on hydraulic parameters, channel geometry, and sediment characteristics, such as the Keulegan, Mayer-Peter-Muller, Lane and Carlson, Henderson, Raudkivi, Subramanya, and Wong and Parker methods, can be applied for more site-specific estimations. This study utilized primary field data and secondary data to estimate n values using various approaches. The n values ranged from 0.096–0.148 (hydraulic parameters), 0.069–0.136 (channel geometry), and 0.009–0.018 (sediment-based methods). Error analysis comparing calculated and observed discharges showed that the channel geometry method yielded the most accurate results with an average error of 15.59%. In contrast, other methods resulted in significantly higher errors. Thus, the channel geometry approach is recommended for estimating the Manning coefficient in the Way Tapus River.
Development of a Python-Based Program for Pareto Analysis in Construction Project Cost Management Toriq Arif Ghuzdewan
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7379

Abstract

Construction projects are highly complex activities that involve various types of tasks with a large number of work items and resources. This complexity makes cost management a significant challenge. To address this challenge, the Pareto principle, which asserts that the majority of results come from a small number of causes, can be applied to focus attention on the most significant tasks. While Pareto analysis can be performed using spreadsheet such as Microsoft Excel, this process often requires lengthy steps, particularly when multiple Pareto charts need to be generated. This study aims to develop a Python-based program that allows for the automatic and efficient generation of Pareto charts. The program was developed through a structured process of identifying requirements, designing, coding, and testing. The program was tested using simulated cost estimate data from a building construction project and the results showed that the program successfully generated Pareto charts for the analysis of labor, material, and overall work-related costs. The testing also indicated that the program is user-friendly, with a step-by-step input mechanism that facilitates ease of use.
Performance Comparison of Convolutional Neural Networks (CNN) and Support Vector Machine (SVM) Algorithms in Human Face Classification Yusuf Iskandar Royan; Pramono Pramono; Anindhiasti Ayu Kusuma Asri
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7384

Abstract

Facial expression recognition is crucial in fields like mental health monitoring and human-computer interaction. This study compares Convolutional Neural Networks (CNN) and Support Vector Machine (SVM) in classifying facial images into stress and non-stress categories. Using a preprocessed dataset of labeled facial expressions, CNN was employed for its strength in automatic spatial feature extraction, while SVM served as a traditional machine learning benchmark. Both models were trained and tested on the same dataset split. Results showed CNN outperformed SVM in all performance metrics: CNN achieved 88.94% accuracy, 94.42% precision, 93.25% recall, and an F1-score of 89.85%, while SVM recorded 76.53% accuracy, 77.14% precision, 85.72% recall, and an F1-score of 80.67%. Despite its lower performance, SVM had faster training and a simpler structure, making it suitable for resource-limited scenarios. The study emphasizes the superiority of deep learning for complex image classification tasks.
Risk Identification in Toll Road Projects: Literature Review and Expert Validation Alif Naufal Raharjo; Latif Budi Suparma; Toriq Arif Ghuzdewan
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7385

Abstract

Toll road projects are complex construction undertakings that inherently involve a variety of significant risks. This study aims to identify the key risks associated with toll road construction projects through a comprehensive literature review, followed by expert validation conducted on a case study of the Yogyakarta–Bawen Toll Road Section 1 project. The validation process involved distributing questionnaires and conducting interviews with five professionals representing the project owner, consultant, and contractor. The literature review initially identified 31 potential risks; however, expert feedback determined that only 20 of these risks were considered relevant. Additionally, experts introduced two new critical risks: design changes due to government policy and prolonged design review processes. This brings the total number of validated risks to 22. These findings provide a foundational basis for further risk analysis and the development of effective mitigation strategies aimed at minimizing adverse impacts during toll road project execution.
Flood Modeling Analysis of the Cokroyasan Watershed in Bayan District, Purworejo Regency Using HEC-RAS Software Muhammad Rizky Fajar; Sely Novita Sari; Anggi Hermawan
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7393

Abstract

Floods are a frequent natural disaster in Indonesia. Heavy rainfall and poor watershed management make the Cokroyasan River Basin (DAS), Bayan District, Purworejo Regency, especially susceptible. The purpose of this study is to analyze the flood inundation area and calculate the peak discharge in the Cokroyasan Watershed using satellite rainfall data and the Digital Elevation Model (DEM). The study calculates the highest water flow during floods using the Nakayasu Synthetic Unit Hydrograph (HSS) method and examines the water flow with HEC-RAS and ArcGIS to create maps showing areas that could flood. The results showed that, using the Log Pearson Type III distribution, the design rainfall for a 25-year return period with a flow coefficient of 0.288 was 117.6711 mm. The maximum flood discharge, as determined by the Nakayasu HSS, was 1684.028 m³/second. Hydraulic analysis was able to map the region of floods based on land cover, covering 16,200 km² in total. 4,961 km² were covered the low flood depth category (0–1 m), 3,175 km² the medium inundation (1–3 m), and 8,061 km² the high inundation (>3 m). The results of the simulation might lead to a more effective approach for managing and reducing the danger of flooding.
Design Approach for Sanitary Piping Retrofit in Passenger Ships According to MARPOL Annex IV and Ship Classification Standards Lely Pramesti; Eko Julianto; Raden Dimas Endro Witjonarko; Edi Haryono; M. Dhani Alrasyid
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7408

Abstract

This research focuses on the redesign of the sanitary piping system on a passenger ship that sustained damage due to a tropical cyclone in the vicinity of Bolok Port, Kupang. The main objective is to redesign the sanitary discharge system to comply with MARPOL Annex IV and classification rules, which governs sewage pollution prevention from ships. A structured engineering methodology was employed, encompassing adherence to regulations, hydraulic evaluation, selection of system components, and schematic design. The assessment considers the number of crew and passengers to determine system requirements. Based on the analysis, the vessel requires a sewage holding tank with a minimum capacity of 4,11 m³/h. Sanitary discharge piping is specified using DN40 Schedule 80 carbon steel pipes according to JIS standards. Jets STP 600 was chosen as the sewage treatment unit, offering a treatment capacity of 0,6 m³/h and conforming to the standards outlined in IMO MEPC.227(64). This retrofit design aims to improve sanitation efficiency, enhance operational safety, and reduce the environmental impact of wastewater discharge. These results provide a basis for the application of sustainable retrofitting strategies on vessels operating under comparable maritime environments.
Effect of Pigment Concentration on Visual and Performance Quality of TPU Resin in Injection Molding Isma Wulansari; Bella Bestari; Ariya Wedian; Debby Wulandary
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7421

Abstract

The visual quality of Thermoplastic Polyurethane (TPU)-based products is significantly influenced by the dispersion of pigments and the moisture content in the material, particularly during the injection process. This study aims to evaluate the effect of ultramarine and fluorescent pigment concentrations on the visual quality and performance of TPU products, as well as to analyze the water content derived from raw materials, such as calcium carbonate (CaCO₃), in the masterbatch formulation. The methods employed include measuring water content using the HydroTracer FLV HT3 tool and conducting visual analysis of injection results, which vary in pigment concentration and drying temperature. The results show that high water content, especially from calcium carbonate type B (up to 0.0733%), contributes to visual defects in the form of white spots and colour inhomogeneity. The fluorescent red pigment exhibits the best visual performance at a concentration of 0.07%, whereas the purple pigment shows poor colour stability. Drying at 110°C for 2 hours is proven to be optimal for producing a clean and uniform TPU surface. This study emphasises the importance of raw material moisture control and pigment formulation optimisation in maintaining consistent TPU product quality, especially in applications with high aesthetic demands.
Real Time Heart Rate And Oxygen Value Monitoring Using Arduino Uno Based MAX30102 Sensor Module Slamet Purwo Santosa; Bintang Teguh Pratama
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7422

Abstract

The development of medical technology has produced efficient and easy-to-use medical devices, such as real-time heart rate and oxygen level monitors using Arduino with MAX 30102 sensors. This tool functions to monitor heart rate and oxygen levels in real time with a high level of accuracy, so it is useful for people with heart rhythm disorders and respiratory disorders such as hypoxemia. The data obtained is processed by the Arduino microcontroller and displayed on the LCD screen, the LED indicator lights up if the results are outside the normal limits. Based on testing, this tool has a low error value of 0.05% for BPM and 0.02 for SpO2 and an accuracy value of 99.95% for BPM and 99.98% in one person tested, while in 6 different people the error value is 0.63% for BPM and 0.09% for SpO2 and an accuracy value of 99.37% for BPM and 99.91% for SpO2 compared to medical standards for different objects. The sensors used are Arduino Uno and MAX30102, which results in more accurate measurements compared to existing device designs. It is hoped that this tool can be a practical solution for routine health monitoring, especially for individuals who need regular monitoring.

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