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International Journal of Science and Environment
Published by CV. Inara
ISSN : -     EISSN : 28090551     DOI : https://doi.org/10.51601/ijse.v2i4
Core Subject : Science, Education, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Physics
International Journal of Science and Environment (IJSE) is to provide a research medium and an important reference for the advancement and dissemination of research results that support high-level research in the fields of Science and Environment . Original theoretical work and application-based studies, which contributes to a better understanding all fields of Science and Environment. The aim and scope of the journal Chemistry, Chemical Analysis, Physical Chemistry, Physics, Biology, Ecology, Biodiversity, Zoology, Biochemistry, Mathematics, Environmental Science, Agriculture, Environment, Forestry.
Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)
Articles 635 Documents
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Analysis And Control Of Genset Damage Risk In The Facility Department Using The Hazard And Operability Study (Hazop) And Fault Tree Analysis (FTA) Methods Boas Ginting; Hery Irwan
International Journal of Science and Environment (IJSE) Vol. 6 No. 3 (2026): August 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i3.778

Abstract

A generator set (genset) is an essential supporting facility that ensures the continuity of electrical power supply in manufacturing companies during failures of the main power source. Generator failures may interrupt production activities, increase maintenance costs, and reduce overall operational effectiveness. This study aims to identify potential risks of generator set failures using the Hazard and Operability Study (HAZOP) method, analyze the root causes of failures using Fault Tree Analysis (FTA), and propose appropriate risk control recommendations. The research data were collected through observations, interviews, documentation, and historical maintenance records from the Facility Department. The HAZOP analysis revealed that radiator overheating had the highest Risk Score of 20, categorized as an extreme risk, while battery drop and fuel filter blockage each obtained a Risk Score of 16, categorized as high risk. Furthermore, the FTA results indicated that generator failure was caused by several basic events, including battery drop, fuel filter blockage, radiator overheating, alternator failure, starter motor failure, and oil leakage, with a calculated top event probability of 67.2%. The proposed recommendations include implementing preventive maintenance, conducting routine inspections, replacing components based on service life, and improving generator condition monitoring to enhance equipment reliability and minimize operational failure risks.
Effects of EDTA and Phosphate Concentrations on Sandstone Permeability: A Multiple Linear Regression Analysis Bayu Satiyawira; Mustamina Maulani; Andry Prima; Cahaya Rosyidan; Lisa samura; Havidh Pramadika; Puri Wijayanti
International Journal of Science and Environment (IJSE) Vol. 6 No. 3 (2026): August 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i3.779

Abstract

Permeability determines how readily fluids can move through reservoir rock, and any reduction caused by formation damage may directly affect well productivity. This study examined the effect of a completion fluid containing EDTA (ethylenediaminetetraacetic acid) and sodium phosphate (Na₃PO₄) on sandstone permeability and evaluated the experimental results using multiple linear regression. Laboratory tests were performed on two sandstone core plugs, S-1 and S-2, with initial effective oil permeabilities (Ko) of 9.9784 mD and 13.4409 mD and porosities of 19.52% and 19.23%, respectively. Three fluid formulations were tested: CF-1 (5% phosphate + 10% EDTA), CF-2 (10% phosphate + 10% EDTA), and CF-3 (15% phosphate + 10% EDTA). After each injection, the samples were aged for 24 hours, and permeability was measured with a Hassler Core Holder using a modified form of Darcy's law. The regression analysis produced the model Y = 0.148 + 1.476X₁ + 5.447X₂, with R² = 0.9794 and an F-statistic of 71.37 (p < 0.0001). Within the model, phosphate accounted for an estimated 78.7% of the permeability improvement, while EDTA accounted for 21.3%. The highest Ko values were obtained with CF-3: S-1 increased from 9.9784 to 19.4885 mD (+95.31%), and S-2 increased from 13.4409 to 26.0651 mD (+93.92%). Incremental improvement decreased from an average of 40.15% at CF-1 to 23.71% at CF-2 and 12.26% at CF-3, indicating diminishing marginal gains at higher phosphate concentrations. Porosity remained unchanged during the injection sequence, suggesting that the increase in permeability was associated with the removal of material restricting pore throats rather than an increase in pore volume. These results support the potential use of the phosphate-EDTA system for formation treatment and completion-fluid optimization within the tested concentration range.
Servant Leadership, Organizational Culture, And Employee Performance: Examining The Mediating Role of Job Satisfaction at The Regional Revenue Agency of Riau Province Windi Desvianti; Abd. Rasyid Syamsuri; Rosnelly Roesdi
International Journal of Science and Environment (IJSE) Vol. 6 No. 3 (2026): August 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i3.781

Abstract

This study examines the effects of servant leadership and organizational culture on employee performance, with job satisfaction acting as a mediating variable, among employees of the Regional Revenue Agency of Riau Province, Indonesia. A quantitative research approach was employed using survey data collected from 58 employees selected from a population of 118 employees through the Slovin formula. Data were analyzed using the Statistical Package for the Social Sciences (SPSS) and Structural Equation Modeling–Partial Least Squares (SEM-PLS) with SmartPLS software. The findings reveal that servant leadership and organizational culture have positive and significant effects on both job satisfaction and employee performance. Furthermore, job satisfaction has a positive and significant effect on employee performance and significantly mediates the relationships between servant leadership and employee performance as well as between organizational culture and employee performance. These findings highlight the importance of strengthening servant leadership practices and fostering a supportive organizational culture to enhance employee satisfaction and ultimately improve employee performance in public sector organizations.
Effectiveness of Corn Cob Activated Carbon In Removing Total Suspended Solids And Total Chromium In Batik Waste Canda Diwratna Wulandari; Anis Artiyani; Maria Roslyn Dwiputri; Hery Setyobudisudarso
International Journal of Science and Environment (IJSE) Vol. 6 No. 3 (2026): August 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i3.783

Abstract

The batik production process involves several stages that generate liquid, gaseous, and solid waste. Furthermore, the process requires significant amounts of water. Without proper treatment, this can degrade water quality. Certain waste parameters, specifically Total Suspended Solids (TSS) and Total Chromium, exceed established quality standards. Given the limitations batik artisans face regarding infrastructure, resources, and access to technology, there is a need for a waste treatment model that is simple, modular, and easy to maintain. Adsorption is a widely used method for wastewater treatment, with corn cobs serving as an adsorbent. The purpose of this study is to test the ability of activated carbon from corn cobs to reduce TSS and total chromium in batik wastewater. The adsorbent dosage was 1.5 grams and 3 grams, with stirring times of 30, 60, and 90 minutes, at a stirring speed of 200 rpm. The results indicate that activated carbon derived from corn cobs effectively adsorbed TSS and Total Chromium from batik wastewater. The highest effectiveness of the percentage of TSS and Chromium content allowance at the variation of activated carbon dose of 3 grams and at the contact time of 90 minutes with the percentage of TSS elimination of 80% and Total Chromium of 97%, but it has not met the quality standards in accordance with the Ministry of Environment and Foresty Regulation No. 16 of 2019, namely TSS of 50 mg/L and total Chromium of 1 mg/L.
Design of a Desktop Application System for Sales Data and Inventory Management at CV Eat Cipeng Jatijajar Syamsul Bakhri; Yogi Ridho Syahputro
International Journal of Science and Environment (IJSE) Vol. 6 No. 3 (2026): August 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i3.785

Abstract

CV Eat Cipeng Jatijajar is a culinary business that currently relies on manual methods for recording and managing inventory and sales data. This situation leads to various issues, such as time inefficiency, a high risk of recording errors, and difficulties in generating reports. This study aims to design and develop a desktop application—built using Java and MySQL—to facilitate the computerized management of inventory and sales data. The software development process follows the waterfall model, spanning from requirements analysis to black-box testing. Implementation results demonstrate that the developed application enhances operational efficiency, minimizes recording errors, and accelerates data retrieval and reporting processes. The application also features user login capabilities, master data management, tracking of incoming and outgoing goods, order processing, and comprehensive inventory reporting. Consequently, the system is expected to support the company's operations more effectively and professionally.

Page 64 of 64 | Total Record : 635

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