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INDONESIA
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 72 Documents
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Model Implementasi Koefisien Produktivitas Tenaga Kerja pada Pekerjaan Struktur Kolom, Balok, dan Plat Berdasarkan Analisis Harga Satuan Pekerjaan (AHSP) PUPR Studi Kasus Gedung Nalanda Kerlima Hutagaol; Slamet Imam Wahyudi; Henny Pratiwi 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.v4i3.469

Abstract

Labor productivity is a key factor determining the success of construction projects, as it directly impacts costs, quality, and project duration. For reinforced concrete structural works—such as columns, beams, and floor slabs—labor productivity is particularly critical because these tasks lie on the project's critical path. In Indonesian construction practice, labor requirements are typically calculated using the Unit Price Analysis (AHSP) standards issued by the Ministry of Public Works and Public Housing (PUPR). However, actual on-site productivity often differs from the standard productivity rates used in the AHSP. This study aims to analyze the discrepancies between actual productivity coefficients and the PUPR AHSP labor coefficients, as well as to identify the factors influencing labor productivity in column, beam, and slab construction. The research employs a quantitative approach involving field observations, actual productivity calculations, multiple regression analysis, and Structural Equation Modeling–Partial Least Squares (SEM-PLS) modeling. The research variables include labor competence, human resource management, material efficiency, and the work environment. The results indicate a disparity between actual coefficients and AHSP coefficients, driven by factors such as project conditions, construction methods, work scale, and resource management effectiveness. SEM simulation results reveal that human resource management and material efficiency are the dominant factors influencing labor productivity. The study produces a labor productivity coefficient calibration model F k =1 + (0.241X1 + 0.382X2 + 0.317X3 + 0.204X4) which can serve as a basis for adjusting AHSP coefficients in building construction projects.
Prediksi Sisa Umur Transformator Berdasarkan Suhu Hotspot pada Gardu Induk Kebonagung Aris Yusuf Maulana; Arif Afandi; Achmad Farouq Nur Wahyu Ramadhan; Irfan Andriansyah
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.v4i3.516

Abstract

The ever-increasing demand for electrical energy has a direct impact on the workload of transformers as vital components of the power system. Overloading can accelerate transformer insulation degradation through rising hotspot temperatures, thereby shortening its service life. This study aims to predict the remaining life of 150/20 kV transformers at Kebonagung Main Substation based on loading and hotspot temperature data throughout 2025. The methods employed include loading ratio calculation, top oil temperature rise, hotspot temperature, relative thermal aging rate using the Montsinger method, and transformer aging loss. Peak load data and ambient temperature data from Malang City were used as calculation inputs. The results show that transformer 5 experienced underloading in several months (below 40%), while transformer 6 operated within an efficient loading range. The hotspot temperatures of both transformers remained below the SPLN standard limit of 98°C. The aging loss values were 0.00650 for transformer 5 and 0.11484 for transformer 6. Based on these calculations, the predicted remaining life of transformer 5 is 23.993 years, while transformer 6 is 15.923 years. These findings are expected to serve as technical references for maintenance and replacement decision-making to improve power system reliability.
Plastic Waste Utilization of Biaxially Oriented Polypropylene (BOPP) as a Substitute Material for Making Paving Blocks Muhammad Rafani; Iin Arianti; Nurul Fitriani; Wattini Wattini; Nizar Nizar
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.v4i3.533

Abstract

This research explores the potential of using Biaxially Oriented Polypropylene (BOPP) plastic waste in the production of paving blocks. BOPP, a common plastic in packaging, is known for its durability and environmental impact. To investigate its suitability, paving blocks with varying BOPP compositions (40%, 45%, 50%, 55%, and 60%) were created and tested for compressive strength and water absorption. The results indicate that a 50% BOPP composition yielded the best performance, meeting the strength requirements for parking lots. While increasing BOPP content also increased water absorption, it remained within acceptable limits. This research demonstrates the potential of BOPP as a sustainable construction material, reducing plastic waste and contributing to a greener future. The findings provide valuable insights into the utilization of recycled materials in construction, offering a solution to both environmental pollution and the demand for durable, cost-effective building materials.
Evaluation of Occupational Safety and Health Risks in Steel Construction Work in E-House Projects in the Modern Steel Construction Industry Ananda Doharman Sormin; 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.v4i3.537

Abstract

The modern steel construction industry presents a relatively high level of Occupational Safety and Health (OSH) risk due to work-at-height activities, heavy material lifting, welding, steel cutting, and heavy equipment operation. E-House projects, as modular steel-based facilities, involve complex construction activities requiring comprehensive risk evaluation. This study aims to evaluate OSH risks in steel construction work on E-House projects using the Hazard Identification, Risk Assessment and Risk Control (HIRARC) approach integrated with Job Safety Analysis (JSA). A quantitative descriptive design was employed through field observations, interviews, documentation studies, and risk assessments covering fabrication, lifting, erection, welding, grinding, and work-at-height activities. The findings identified 35 potential hazards consisting of 8 high-risk, 19 medium-risk, and 8 low-risk categories. The highest risks were associated with steel erection, crane lifting operations, and work-at-height activities with risk ratings exceeding 15. Risk control measures including personal protective equipment, permit-to-work systems, equipment inspections, safety briefings, and supervision significantly reduced risk levels. The study contributes to the enhancement of OSH management systems in modern steel construction projects and provides practical references for improving workplace safety culture.
Numerical Investigation of Multi-Stage Hybrid Darrieus–Savonius Hydrokinetic Turbine Performance with Fibonacci Blades and Darrieus Solidity Variations Dimas Rio Javani; Sutardi
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.v4i3.544

Abstract

Indonesia’s increasing energy demand and fossil fuel crisis have accelerated the transition toward New and Renewable Energy (NRE). With an NRE potential of 3,600 GW and utilization still below 2%, hydrokinetic turbines offer a promising solution for harnessing water flow energy. This study numerically investigated the performance of a multi-stage hybrid Darrieus–Savonius hydrokinetic turbine using Computational Fluid Dynamics (CFD). The proposed design combined Fibonacci spiral-based Savonius blades with NACA 0018 Darrieus blades. Simulations were conducted within a Tip Speed Ratio (TSR) range of 0.2–2.3 and solidity ratios of 0.5–1.1 to determine the optimum turbine performance. The results showed that blade solidity significantly influenced energy extraction efficiency in a non-linear manner. The optimum condition was achieved at a solidity ratio of 0.95 and TSR = 1, producing a maximum power coefficient (Cp) of 0.082. Flow visualization indicated stable negative pressure regions and higher local flow acceleration, which reduced flow separation around the blades. In contrast, a solidity ratio of 1.1 at TSR 0.8 caused stronger blockage effects and wake interactions, increasing hydrodynamic drag and reducing turbine performance. These findings demonstrate that solidity ratios close to unity can improve torque stability and turbine efficiency under low TSR conditions.
Potential of Boiler Ash from 30 and 60 Ton/Hour Palm Oil Mills as a Nutrient Source in Palm Plantation Gita Rohani Br. Pardede; Ika Ucha Pradifta Rangkuti
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.v4i3.546

Abstract

The palm oil industry generates large amounts of biomass waste, one of which is boiler ash produced from the combustion of fiber and shell in palm oil mill boilers. Boiler ash is generally underutilized and is commonly stockpiled around factory areas, potentially causing environmental pollution. This study aimed to evaluate the potential of boiler ash from palm oil mills (POM) with capacities of 30 ton/hour and 60 ton/hour as a nutrient source for oil palm plantations. The research employed a quantitative descriptive method using mass balance analysis, laboratory analysis, and Independent Samples T-Test. The results showed that the 60 ton/hour POM produced a higher amount of boiler ash, reaching 16,712.75 tons, compared to 8,624.40 tons from the 30 ton/hour POM. Boiler ash from the 30 ton/hour POM had a higher Nitrogen content of 0.36%, while boiler ash from the 60 ton/hour POM contained higher levels of Potassium (4.79%), Phosphorus (2.17%), Magnesium (2.70%), and Calcium (6.87%). Statistical analysis indicated that most nutrient parameters showed significant differences at the 5% significance level. Boiler ash has strong potential to be utilized as an alternative nutrient source to support sustainable oil palm plantation systems and reduce dependence on inorganic fertilizers.
Delay Risk Factors in Foundation Works Using SEM and Multi-Group Analysis Jonathan Natanael; Hans Dermawan; Fenny Septiastuti
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.v4i3.557

Abstract

Delays in construction projects continue to be a significant problem in infrastructure development, especially in foundation works where field uncertainties are common. This study aims to identify the dominant delay risk factors and examine their influence on project time performance. A quantitative approach was applied using questionnaires distributed to construction professionals, and the collected data were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) and Multi-Group Analysis (MGA). The results indicate that equipment and productivity factors as well as financial and administrative factors have significant effects on project time performance, while other factors were not statistically significant. The structural model showed moderate explanatory power with an R² value of 0.471. The findings also revealed a discrepancy between perceived importance and actual impact, where technical factors were perceived as highly important but operational and financial factors showed stronger direct effects on project execution. In addition, no significant differences were found between contractors and consultants. It was concluded that mitigation strategies should prioritize operational and financial aspects to effectively reduce delays in foundation works.
Potensi Tandan Kosong Kelapa Sawit dari Pabrik Kelapa Sawit Kapasitas 30 Ton/Jam dan 60 Ton/Jam sebagai Penyedia Unsur Hara di Perkebunan Kelapa Sawit Rando Kelvin Silalahi; Ika Ucha Pradifta Rangkuti
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.v4i3.561

Abstract

Oil Palm Empty Fruit Bunches (EFB) are one of the major solid wastes generated from the processing of Fresh Fruit Bunches (FFB) in palm oil mills. This study aims to evaluate the potential of EFB produced from palm oil mills with processing capacities of 30 tons/hour and 60 tons/hour as a nutrient source for oil palm plantations. The study employed a quantitative descriptive approach using mass balance analysis, laboratory testing, and the Independent Sample T-Test using IBM SPSS version 25. The parameters analyzed included macronutrients, micronutrients, and the physicochemical properties of EFB. The results showed that the mill with a capacity of 60 tons/hour produced a higher amount of EFB, reaching 13.80 tons/hour, compared to 6.90 tons/hour from the 30 tons/hour mill. EFB from the 60 tons/hour mill contained higher levels of nitrogen, potassium, phosphorus, copper, and iron, while EFB from the 30 tons/hour mill showed higher values of zinc, pH, organic carbon, organic matter, and C/N ratio. Statistical analysis revealed significant differences in several nutrient parameters between the two mill capacities at a 5% significance level. Overall, EFB demonstrates strong potential as an organic fertilizer source to improve soil fertility and support sustainable oil palm plantation systems.
The Omnipresence of Marketing: A Literature Review on Ubiquitous Marketing Strategies Muhammad Rafi Kusuma Wardhana; Yati Rohayati; Endang Chumaidiyah
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.v4i3.574

Abstract

This study is conducted to identify and synthesize the key success factors for implementing a Ubiquitous Marketing (UM) strategy in an increasingly dynamic, technology-driven, and digitalized competitive environment. The study applies a Systematic Bibliometric Literature Review (SBLR) using the SCOPUS database, focusing on publications in Business, Management, and Accounting from 2020 to 2025. A stringent screening process employing the keywords “Context” and “Personalized” as the core elements of UM yields a final set of 30 publications for analysis. The bibliometric results indicate that, although annual publication volumes fluctuate, the overall scholarly quality in this area is strong, with 68% of the selected works published in Q1 journals. The screened literature also demonstrates substantial academic influence, reflected in 394 total citations and an h-index of 13. The thematic synthesis highlights personalization as the central pillar of UM, increasingly enabled by the integration of artificial intelligence, big data, and machine learning to support ultra-personalization. At the same time, the literature emphasizes ethical and implementation challenges, particularly those related to data privacy, transparency, and security, which are essential to sustaining consumer trust. This study contributes a structured theoretical basis for understanding and operationalizing Ubiquitous Marketing (UM), clarifying the role of context and personalization, and outlining the key opportunities and constraints that shape successful implementation.
Pengaruh Pelatihan dan Pengawasan terhadap Penerapan K3 pada Penggunaan Alat Pelindung Diri (APD) di PT. XYZ Region 1 Kalimantan Tengah Khoiriyyah Siregar; Purjianto Purjianto
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.v4i3.578

Abstract

This study aims to evaluate the effect of training and supervision on the implementation of Occupational Safety and Health (OSH) in the use of Personal Protective Equipment (PPE). The research was conducted at PT XYZ, Kotawaringin Barat Regency, Central Kalimantan, using a quantitative method with a saturated sampling technique involving 61 operational workers as respondents. Data were analyzed using multiple linear regression. The results indicate that training, supervision, and OSH implementation were all categorized as high, suggesting that the company’s safety management system has been functioning effectively. However, hypothesis testing shows that training does not have a significant effect on OSH implementation, while supervision has a positive and significant effect and serves as the dominant factor in improving compliance with PPE usage. Simultaneously, training and supervision significantly influence OSH implementation, contributing 67% to the dependent variable. These findings emphasize that consistent and communicative supervision is more effective in shaping workers’ compliance behavior compared to training that is still less contextual. Therefore, the company is advised to improve the quality of more practical training and strengthen the supervision system to create a sustainable safety culture in the workplace.

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