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Erifive Pranatal
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Journal of Applied Sciences, Management and Engineering Technology (JASMET)
Published by Institut Teknologi Adhi Tama Surabaya
ISSN : -     EISSN : 27212165     DOI : https://doi.org/10.31284/j.jasmet.2020.v1i1.704
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Journal of Applied Sciences, Management and Engineering Technology (JASMET) is an international peer-reviewed journal that was launched by LPPM ITATS. It is dedicated to provide a high-level platform in all aspect of science, management and engineering technology Scope of the journal: Engineering, Science and Management
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 108 Documents
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Assessing Crime Vulnerability Levels in Balikpapan City Rahmat Aris Pratomo; Nadia Almira Jourdan; Dwiana Novianti Tufail; Ogamaliel Sohmo Sinamo; Deka Adam Budiman; Ajeng Meidiany Putri
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.7039

Abstract

Crime is a social issue with far-reaching impacts on community security and quality of life, including in Balikpapan City, the largest city in East Kalimantan, with a population of 704,110 in 2022. Despite being an economic hub with significant contributions in the oil, gas, and trade sectors, Balikpapan faces serious challenges in creating a safe environment, marked by high crime rates and an increase in cases such as theft, assault, and drug-related crimes. This heightened vulnerability is influenced by social, economic, and environmental factors, such as social inequality, unemployment, and low legal awareness. To address these challenges, in-depth assessments and crime mapping are essential to formulating effective prevention strategies and efficiently allocating resources. This study aims to assess the crime vulnerability levels in Balikpapan City through a spatial approach using Kernel Density analysis. This method estimates spatial density based on crime incident locations recorded in 2022-2023, sourced from the Balikpapan Police Department. The data were categorized into five vulnerability levels to produce detailed distribution maps and crime vulnerability levels, aiding in identifying crime distribution patterns in the city. The classification of crime vulnerability levels in Balikpapan City based on Kernel Density analysis reveals areas of very high vulnerability concentrated in Balikpapan Kota, Balikpapan Tengah, and Balikpapan Selatan districts, with dominance in Balikpapan Kota. High vulnerability levels surround very high vulnerability areas and are distributed across the same three districts. Moderate vulnerability levels extend across five districts, covering Balikpapan Kota, Tengah, Selatan, Barat, and Utara. Low and very low vulnerability levels are scattered across all districts, with Balikpapan Barat largely falling into the very low category.
Analysis of Water Quality in Abandoned Illegal Gold Mining Pit in Ketapang Regency, West Kalimantan, Indonesia Desyana Ghafarunnisa; Flaminggo Gingga; Syarifah Aqla
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.8220

Abstract

Unlicensed Gold Mining (UGM), commonly carried out using open-pit methods, leaves behind excavation voids. Over time, these voids serve as catchment areas for rainwater and surface runoff. When not properly managed and repurposed after mining activities cease, such voids may pose negative environmental impacts, including the formation of acid mine drainage. Acidic water has the potential to contaminate surrounding surface and groundwater, threatening ecosystems and public health. Moreover, the presence of heavy metals in void water raises concern due to their long-term toxicity, thus requiring comprehensive studies to assess water quality conditions in abandoned unlicensed gold mine voids. The urgency of this research lies in addressing the environmental risks posed by voids left from unlicensed gold mining, particularly concerning water quality. Therefore, this study aims to analyze the water quality of such voids in accordance with national environmental quality standards. The research employed direct surveys, water sampling from voids, and laboratory analyses with test parameters based on Government Regulation No. 22 of 2021 on Environmental Protection and Management, Annex VI, including temperature, TDS, pH, CN⁻, and Hg. The results were compared to the National Water Quality Standards stipulated in the same regulation. This study is expected to demonstrate whether the water quality in mining voids falls below the permissible limits of environmental standards, indicating safety for the environment and potential utilization by surrounding communities.Keywords: Environmental quality standards; water quality; water pollution; gold mining; void)
Numerical Investigation Of Reinforcement Ratio Effects on the Flexural Performance of High-Calcium Fly Ash Geopolymer Concrete Beams Muhammad Rifky Trisnawardhana; Bambang Piscesa; Indra Komara
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.8516

Abstract

This study investigates the influence of the longitudinal reinforcement ratio on the flexural behavior of high-calcium fly ash geopolymer concrete (GPC) beams using three-dimensional nonlinear finite element analysis (3D NLFEA). Beams with identical geometry and shear reinforcement were modeled, with reinforcement ratios varied from under-reinforced to over-reinforced conditions. Material properties were based on validated experimental data. Results show that increasing reinforcement enhances flexural strength but significantly reduces ductility and energy absorption. Under-reinforced beams exhibited ductile, tension-controlled failure governed by steel yielding, while over-reinforced beams failed abruptly due to concrete crushing. The transition from ductile to brittle behavior occurs at significantly lower reinforcement ratios in GPC (around ρ = 0.0157) compared to ordinary Portland cement concrete. Based on ductility ratio, energy absorption, and toughness index i10, a maximum reinforcement ratio of ρ ≤ 0.010 is recommended for ductile design of high-calcium fly ash GPC beams.
Health Risk Assessment of Microplastic Contamination in Kamoning River Sampang, Madura Astri Rino Okvitasari; Agus Muji Santoso; Retno Syahriawati Dewi; Muhammad Arus Samudro; Aurista Miftahatul Ilmah; Afifah Bilqis Faudya
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.8778

Abstract

Microplastics have become pervasive contaminants in riverine and coastal environments, raising concern about their implications for ecosystems and communities that rely on these waters. This study investigates microplastic contamination and associated risks in the Kamoning River, Sampang District, Madura, Indonesia, where residential, agricultural and port activities may drive substantial inputs of plastic debris. Surface water samples were collected at six stations representing upstream, midstream, urban, port and estuarine reaches, and analysed for microplastic abundance and morphology using sieving, chemical digestion and microscopic identification. Microplastic particles were quantified as fragments, fibres and films, and total abundances were expressed as particles per litre. To characterize potential risks, a screening-level risk quotient (RQ) approach was applied by comparing estimated exposure concentrations with literature-based reference values for ecological and human health endpoints. The average of microplastic abundances were in the order of 10⁴ particles per litre and increased from upstream to estuarine stations, with fragments as the dominant form at all locations. Calculated RQ values for short-term exposure via water use and local fish consumption ranged from 0.23 to 0.51, indicating low to moderate concern under current conditions. These findings show that the Kamoning River functions as a critical conduit and accumulation zone for microplastics, while present risk levels remain below commonly used thresholds. The study contributes a locally grounded, reproducible framework for linking microplastic abundance data to risk indicators that can support targeted plastic waste management and inform future monitoring and research in Indonesian river systems.
Concrete Quality Analysis Based on Compressive and Splitting Tensile Strength Using Inferential Statistical Methods Muhammad Alifsyah Ananda Rudyta; Eswan Eswan; Wahyu Mahendra
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.8328

Abstract

This research aims to analyze the effect of using two types of coarse aggregates, Senoni and Palu, combined with silica sand as a fine aggregate replacement, on the compressive strength and split tensile strength of concrete. Tests were conducted at concrete ages of 7, 14, 21, and 28 days to observe the development of concrete strength over time. A total of 80 cylindrical specimens were prepared, consisting of 40 specimens using Senoni aggregate and 40 specimens using Palu aggregate, each tested for both compressive and split tensile strength.Statistical analysis using the independent sample T-test was applied to determine the differences in strength between the two types of aggregates. The results showed that there were significant differences in compressive strength at all testing ages, indicated by significance values (Sig.) 0.05 and t-calculated values greater than t-table, leading to the rejection of H₀ and the acceptance of H₁. This confirms that the physical characteristics of the aggregates have a significant effect on the compressive strength of concrete. In contrast, for split tensile strength, not all ages showed significant differences. Some ages produced Sig. values 0.05, indicating no statistically significant differences between the two aggregates under those conditions.Furthermore, a statistical correlation analysis between compressive strength and split tensile strength was conducted. The results indicated a moderately strong and positive relationship between these two parameters, although the strength of the correlation varied depending on the concrete age. Overall, this study confirms that the selection of coarse aggregate types plays an important role in concrete performance, both in resisting compressive loads and indirect tensile forces.
Application of Statistical Quality Control in Monitoring Concrete Compressive Strength William Bagita Samuel; Eswan Eswan; Wahyu Mahendra
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.8288

Abstract

Concrete is a primary material in construction, directly influencing structural strength and stability. Therefore, quality control, particularly of compressive strength, is essential. This study evaluates the planned concrete strength of f’c 30 MPa used in the Presidential Parking Building Project at Indonesia’s new capital, employing a Statistical Quality Control (SQC) approach. The main objective is to assess the stability of concrete quality and the effectiveness of various control chart methods in statistically monitoring the production process. A total of 32 compressive strength tests were conducted at 7 and 28 days, each involving three specimens. Five control chart methods were applied: X̄, R̄, S̄, Moving Range (MR), and Moving Average (MA), based on SNI 1974:2011 standards. Results show that the X̄ chart indicates the average compressive strength remains within control limits, suggesting process stability. R̄ and S̄ charts confirm controlled variation among samples, while MR charts reveal minor short-term fluctuations. MA charts successfully capture subtle trends without indicating significant process shifts. Overall, the concrete production process is statistically in-control. The combined use of these five control charts provides a comprehensive view of concrete quality; covering average, variation, and trend, and serves as a foundation for continuous quality improvement.
Evaluation of 30 MPa Concrete Strength Using Inferential Statistics and Control Charts Noor Ainun Cholis; Eswan Eswan; Wahyu Mahendra
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.8306

Abstract

This study aims to evaluate the quality and statistical control of 30 MPa concrete used in the construction of the Main Genset Building at Nusantara Capital City (IKN). The primary objective is to determine whether the concrete meets the design specifications and assess the statistical capability of its production process. A total of 69 concrete cylinder samples tested at 28 days were analyzed using two quantitative approaches: inferential statistics (normality test and one-sample t-test) and statistical quality control tools (control charts and process capability analysis).Descriptive statistical analysis revealed that the average compressive strength at 28 days reached 33.464 MPa, exceeding the target value of 30 MPa. The normality test confirmed a normal distribution, validating the use of the T-test, which showed a statistically significant and positive deviation from the design strength. Control chart analysis indicated that the production process was stable and statistically controlled, fulfilling the prerequisites for process capability evaluation.The process capability index (Cpk) was calculated at 1.101, suggesting that the production process is capable of meeting specification limits. However, the slightly lower Cpk compared to Cp (1.193) indicates a shift in the mean compressive strength toward the upper specification limit. The study concludes that the concrete quality meets design requirements with satisfactory process control, but recommends tighter control of material variability and adjustment of production settings to center the strength distribution, enhancing efficiency and reducing future quality risks.
Optimizing Queue System Performance Through a Comparative Analysis of M/M/1 and M/M/S Models Using Monte Carlo Forecasting (Case Study: Engine Reconditioning at PT. Intidaya Jember) Zahrudin Bahtiar; Rony Prabowo; Hendro Nugroho
Journal of Applied Sciences, Management and Engineering Technology Vol 7, No 1 (2026)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2026.v7i1.7942

Abstract

This study aims to optimize the queuing system in the engine reconditioning process at PT. Intidaya Dinamika Sejati by comparing M/M/1 and M/M/S models, supported by Monte Carlo simulation for demand forecasting. The research was motivated by prolonged customer waiting times and uneven machine utilization, which adversely affected productivity and service quality. Data were gathered through direct observations, interviews, and time studies to capture arrival and service parameters. Monte Carlo simulation was employed to model demand variability over six months, with results integrated into discrete-event simulation models built in Arena. The findings revealed that the existing M/M/1 configuration caused significant bottlenecks at Cylgrinding, Honing, and Connecting ROD stations, leading to average waiting times exceeding 150 minutes.In contrast, implementing an M/M/S model by adding parallel servers at these critical workstations reduced waiting times by over 90%, shortened queue lengths, and balanced machine utilization. This confirms that combining Monte Carlo forecasting with multi-server strategies effectively enhances operational performance and customer satisfaction. Therefore, it is recommended that the company adopt the M/M/S configuration at high-demand stations and conduct regular evaluations to ensure sustained system efficiency.

Page 11 of 11 | Total Record : 108

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