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Erifive Pranatal
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Jl. Arief Rahman Hakim No.100, Klampis Ngasem, Kec. Sukolilo, Kota SBY, Jawa Timur 60117
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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 104 Documents
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Assessing Crime Vulnerability Levels in Balikpapan City Pratomo, Rahmat Aris; Jourdan, Nadia Almira; Tufail, Dwiana Novianti; Sinamo, Ogamaliel Sohmo; Budiman, Deka Adam; Putri, Ajeng Meidiany
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 Ghafarunnisa, Desyana; Gingga, Flaminggo; Aqla, Syarifah
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 Trisnawardhana, Muhammad Rifky; Piscesa, Bambang; Komara, Indra
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 Okvitasari, Astri Rino; Santoso, Agus Muji; Dewi, Retno Syahriawati; Samudro, Muhammad Arus; Ilmah, Aurista Miftahatul; Faudya, Afifah Bilqis
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.

Page 11 of 11 | Total Record : 104

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