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Dedi Purwanto Indra Kusuma
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RESWARA: Jurnal Riset Ilmu Teknik
Published by Lembaga Penelitian dan Pendidikan (LPP) Kalibra
ISSN : -     EISSN : 30259444     DOI : https://doi.org/10.70716/reswara
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
RESWARA: Jurnal Riset Ilmu Teknik is a leading scholarly platform that examines the strategic role of engineering disciplines in advancing the Sustainable Development Goals (SDGs). The journal is dedicated to publishing recent research, innovations, and engineering solutions that support sustainable development. The editorial board welcomes manuscripts based on theoretical frameworks and empirical research. The journal scope covers scientific knowledge and research-based information, including applied research and recent developments in engineering research and development. The primary focus includes Civil Engineering and Spatial Planning, Industrial Engineering, Electrical Engineering and Informatics, Earth Science Technology, and Naval Architecture. All manuscripts published in RESWARA undergo a double-blind peer review process. The final decision on manuscript acceptance rests with the Editorial Board, based on recommendations from independent peer reviewers.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 131 Documents
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Optimasi Spesifik-Sifat Pupuk Organik Cair Urine Sapi untuk Bayam Hidroponik Rakit Apung Sulaminingsih Sulaminingsih; Charlie Novianry Panjaitan; Suwarno Suwarno; M. Rehan Saputra
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.723

Abstract

Floating raft hydroponics can support rapid leafy vegetable production, yet reliance on commercial mineral nutrient solutions may limit affordability and circularity. This study evaluated the effect of cow urine-based liquid organic fertilizer on the growth of spinach (Amaranthus hybridus L.) in a floating raft hydroponic system and identified the most promising treatment zone. Six coded treatments (B0–B5) were tested with five replications. Plant height, leaf number, and leaf width were measured at 1, 2, and 3 weeks after transplanting, while root length was measured at the final observation. Data were analyzed using one-way ANOVA and eta-squared effect size. The treatments significantly affected all final growth variables. At 3 weeks after transplanting, B2 (35 ml cow urine fertilizer/L water) produced the tallest plants (16.98 ± 0.41 cm), whereas B1 (30 ml cow urine fertilizer/L water) produced the highest leaf number (10.00 ± 1.00 leaves plant−1), the widest leaves (2.60 ± 0.14 cm), and the longest roots (22.68 ± 7.03 cm). Effect sizes were large for final plant height, leaf number, leaf width, and root length. Cow urine-based liquid organic fertilizer markedly shaped spinach vegetative growth, but the response was non-linear. B1–B2 represent the most promising treatment zone.
GIS-Based USLE Assessment of Land Use Change Impacts on Erosion and Streamflow in the Ciujung Watershed Agung Satria Kurniawan; Dyah Indriana Kusumastuti; Endro Prasetyo Wahono; Ofik Taufik Purwadi; Ahmad Zakaria
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.530

Abstract

This study investigates the impact of land use change on streamflow discharge and soil erosion in the Ciujung Watershed, Indonesia. The research aims to evaluate hydrological responses and erosion dynamics associated with changes in land cover between 2016 and 2021. Rainfall and discharge analyses were conducted using the Thiessen Polygon method and statistical regression analysis, while erosion was estimated using the Geographic Information System (GIS)-based Universal Soil Loss Equation (USLE). Land use changes were identified through Landsat image interpretation. The results indicate that increased rainfall and substantial land use conversion have altered watershed conditions. Forest, shrubland, swamp, and paddy field areas decreased, while plantation, dryland farming, and settlement areas expanded significantly. These changes were associated with increases in annual flow volume, average discharge, runoff coefficient, erosion rate, and sediment yield, indicating a decline in watershed performance. Regression analysis revealed a strong positive relationship between rainfall and river discharge variables. The GIS-based USLE analysis showed a substantial increase in erosion and sediment production during the study period. The findings demonstrate that land use change, combined with increasing rainfall, has accelerated watershed degradation and heightened erosion risks in the Ciujung Watershed. Sustainable land management and conservation measures are therefore essential to mitigate future environmental impacts and maintain watershed functions.
Analysis of Porosity and Undercut Defects in Structural Steel Grade S355JR Fabrication Sadrak Jhoshua Nababan; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.532

Abstract

This study aimed to identify the dominant causes of porosity and undercut defects and evaluate the effectiveness of welding defect control measures applied during the fabrication of S355JR Structural Steel in an E-house project at PT.X Batam. A descriptive qualitative approach supported by quantitative data was employed through field observations, semi-structured interviews, documentation, and Pareto and fishbone analyses. The results indicated that welding defects were predominantly caused by welding method (10 joints; 34.5%), followed by environmental factors (7 joints; 24.1%), machine conditions (5 joints; 17.2%), material conditions (4 joints; 13.8%), and welder skill (3 joints; 10.3%). The findings showed that improper welding parameters, unstable shielding gas due to wind exposure, inadequate equipment condition, contaminated material surfaces, and inconsistent implementation of the Welding Procedure Specification (WPS) were the principal contributors to defect occurrence. Corrective measures, including material surface cleaning, dry electrode usage, rod oven storage, welding parameter control, and welding habitat protection, effectively reduced the occurrence of porosity and undercut defects. The novelty of this study lies in the integrated evaluation of technical and operational factors affecting welding quality under actual EPC fabrication conditions. The findings provide practical guidance for improving welding quality control and reducing production losses in structural steel fabrication.
Mine Road Design Feasibility and Its Impact on Overburden Hauling Productivity at PT PBT Mutia Septriandini; Aleksander Purba; Rahayu Sulistyorini
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.540

Abstract

This study aims to analyze the feasibility of overburden (OB) hauling road design on production productivity and operational efficiency at PT PBT. The research employed a quantitative descriptive method through several stages, including preparation, data collection, data processing, data analysis, and conclusion formulation. Primary data were obtained through measurements of hauling road geometric parameters, including road width, grade, cross slope, superelevation, turning radius, cycle time, hauling equipment productivity, and fuel consumption. The results indicate that most road geometric parameters did not comply with technical standards, where the actual road width ranged from 17,1-19,1 m and the road grade reached 9%. These conditions increased operational resistance and hauling equipment cycle time. After the hauling road redesign was implemented, hauling equipment productivity increased from 108.34 BCM/hour to 130.69 BCM/hour, representing an improvement of 20.63%, while cycle time decreased from 13.45 minutes to 11.15 minutes. In addition, fuel consumption decreased by 10.21%, from 441.88 liters/hour to 396.74 liters/hour, resulting in significant operational cost savings. Therefore, improvements in hauling road geometry were proven to enhance mining productivity and operational efficiency.
Study on the Implementation of the Hybrid Annuity Model Financing Scheme in Drinking Water Supply Systems (SPAM) in Indonesia Klara Nala Rita; Ahmad Zakaria; Ahmad Herison; Ofik Taufik Purwadi; Yuda Romdania
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.559

Abstract

This study examines the implementation of the Hybrid Annuity Model (HAM) financing scheme in the Public-Private Partnership (PPP) project of the Lombok Regional Water Supply System (SPAM) in West Nusa Tenggara. The project service area covers Mataram, West Lombok Regency, and North Lombok Regency with a 20-year concession period. This research employed a quantitative approach using descriptive analysis and discounted cash flow-based financial modelling to evaluate the financial feasibility and sensitivity of the HAM scheme. The study utilized secondary data obtained from pre-feasibility study documents, SPAM technical and operational data, macroeconomic data, and infrastructure financing regulations. Financial feasibility  assessed by Net Present Value (NPV), Internal Rate of Return (IRR), Debt Service Coverage Ratio (DSCR), and Payback Period (PBP). The results point out that both the unsupported PPP scheme and the HAM scheme are financially feasible. The PPP scheme generated a higher NPV of IDR 132.673 billion and a faster payback period compared to the HAM scheme, which produced an NPV of IDR 55.527 billion. However, the HAM scheme demonstrated a stronger DSCR value of 1.5. Sensitivity analysis revealed that the project is highly sensitive to revenue reductions and increases in investment and operational costs.
HIRADC Analysis for Occupational Accident Prevention During 50K STG Major Overhaul Maintenance at PT. PLN Batam Annisa Nur Hidayah; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.586

Abstract

The electricity sector is categorized as a high-risk industry (asset-sensitive enterprise). At PT PLN Batam, particularly at the 124.5 MW Tanjung Uncang Combined Cycle Power Plant (PLTGU), the reliability of the Steam Turbine Generator (STG) system depends on routine large-scale maintenance, including the 50K Major Overhaul, which involves significant hazards such as high-voltage electricity, high pressure, extreme temperatures, and mechanical risks. This study aimed to analyze potential hazards, assess occupational risk levels, and determine appropriate control measures for the 50K Major Overhaul of the Steam Turbine Generator using the Hazard Identification, Risk Assessment, and Determining Control (HIRADC) method. A qualitative descriptive approach was employed through field observations, interviews, and document analysis. The results identified 11 maintenance activities, consisting of 6 High Risk and 5 Medium Risk activities before control implementation. The highest risk was associated with working at heights, high-pressure and high-temperature systems, high-voltage electrical work, and the use of power tools, with a maximum Severity value of 5. After implementing engineering controls, administrative controls, competency requirements for certified personnel, and the use of personal protective equipment (PPE), all 11 activities were successfully reduced to the Low Risk category, with the Likelihood value decreasing to 1. These findings demonstrate that the systematic implementation of the HIRADC method effectively reduces occupational risks and provides a practical framework for improving safety performance during major overhaul activities at combined-cycle power plants.
The Effect of 2025 Government Budget Efficiency Policy on Subcontractor Performance in Supporting Main Contractor Work Completion: Paspampres Headquarters Project Enny Vebriyanti Novian; M. Zaki
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.593

Abstract

This study aims to analyze the effect of the 2025 government budget efficiency policy on subcontractor performance in supporting the completion of main contractor work in the MAKO Paspampres Project, Central Jakarta. The research employs a mixed-methods approach within a case study framework, combining qualitative and quantitative analyses. Data were collected through interviews, observations, and questionnaires involving subcontractors, main contractors, and project managers, supported by secondary data such as project documents, government regulations, and academic literature. The results indicate that the budget efficiency policy has a positive and significant effect on subcontractor performance, with a regression coefficient of 0.591 and a significance value of less than 0.05. The policy also influences project management adjustments and affects the completion of construction work. Subcontractor performance plays a crucial role in project success, particularly in terms of time, cost, and quality. Therefore, adaptive strategies and effective coordination among stakeholders are essential to maintain project stability and ensure successful completion.
Kinerja Pengelolaan Persampahan dalam Mendukung Penataan Kawasan Permukiman Kumuh: A Systematic Literature Review Raihannisa Fitri; Heni Fitriani; Febrian Hadinata
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.594

Abstract

Despite the growing body of research on solid waste management and slum settlement upgrading, existing studies remain fragmented, limiting a comprehensive understanding of the factors influencing waste management performance. This study synthesizes current evidence and develops a conceptual framework of waste management performance in supporting sustainable slum upgrading through a Systematic Literature Review (SLR). Following the PRISMA 2020 guidelines, 50 peer-reviewed articles published between 2015 and 2025 were systematically selected and analyzed using thematic synthesis. The findings identify five key dimensions influencing waste management performance: technical and operational support, management effectiveness, institutional and regulatory capacity, financial sustainability, and community participation. The effectiveness of these dimensions is moderated by socio-economic conditions, settlement characteristics, governance capacity, and policy implementation, explaining variations in waste management outcomes across regions. The study's novelty lies in integrating these determinants into a comprehensive conceptual framework that explains how waste management performance contributes to environmental quality improvement and sustainable slum settlement upgrading. The proposed framework enriches the theoretical understanding of integrated waste management while providing evidence-based guidance for policymakers and urban planners in designing adaptive, integrated, and sustainable waste management strategies.
Kinerja Teknologi Reverse Osmosis AROFAH dalam Pengolahan Air Permukaan sebagai Sumber Air Minumdi Daerah Bencana Panji Mahesa Monanov; Setijo Bismo
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.595

Abstract

The provision of safe drinking water in post-disaster conditions is a critical necessity. This study aims to evaluate the performance of the basic prototype of the AROFAH Machine based on Reverse Osmosis (RO) technology, designed to treat various sources of surface water into potable water. The system consists of pre-treatment using polypropylene (PP) filters, granular activated carbon (GAC), carbon block (CTO), and a Polyamide Thin Film Composite (TFC) RO membrane. Testing was conducted using surface water at the DTK Building, lake water, and river water on the UI Depok campus, with flow restrictor variations of 400 and 550 mL/min. The results showed permeate TDS of 2–15 mg/L from feedwater TDS of 91–170 mg/L, with removal efficiency of 93–99%. The permeate flow rate remained relatively stable at 410–430 mL/min during 120 minutes of operation. All permeate samples met microbiological requirements, with E. coli and Total Coliform at 0 CFU/100 mL. The designed system requires only about 36 W of power, making it potentially suitable as a portable drinking water unit for disaster-affected areas.
Manajemen Risiko Fasilitas Filtered Tailings Menggunakan Metode FMEA: Studi Kasus Tambang Emas PT. ABC Khairul Afandi; Tri Joko Wahyu Adi
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.600

Abstract

Tailings represent a by-product of mineral processing that poses significant technical and environmental risks; therefore, PT.ABC plans to develop filtered tailings (dry stack) facility to address the limited capacity of the existing Tailings Storage Facility (TSF). This study aims to assess the risks associated with the proposed facility using a combined Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA) approach, involving the identification of potential failure modes, evaluation of severity, occurrence, and detection, and calculation of the Risk Priority Number (RPN) based on literature review, questionnaires, and expert Focus Group Discussions (FGD). The results identify 24 potential failure modes, with 6 categorized as high-priority risks, and reveal three principal clusters of failure causes: geotechnical, hydrological and drainage, and environmental and geochemical factors. The implementation of mitigation measures results in a significant average RPN reduction of 71%, bringing the risks to an acceptable level. These findings provide practical contributions to the development of engineering design, technical specifications, risk registers, and corporate risk management systems, thereby supporting safe, efficient, and sustainable mining practices.

Page 10 of 14 | Total Record : 131

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