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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 670 Documents
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Legal Certainty for the Parties to a Notarial Deed Minute Not Signed by a Notary Due to Death Ida Ayu Hangganararas Dhaneswara; Putu Ayu Sriasih Wesna; Ida Bagus Agung Putra Santika
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 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.v6i2.511

Abstract

The death of a notary prior to signing a deed minute generates a normative void that existing Indonesian notarial law has yet to adequately resolve. This study examines two central issues: the form and limits of legal protection available to parties in respect of an unsigned deed minute following a notary's death, and the legal remedies accessible to those parties to enforce the substantive content of the agreement. Employing normative legal research through statute, conceptual, and case approaches, this study analyzes primary legal materials including Law Number 30 of 2004 on Notarial Office as amended by Law Number 2 of 2014 (UUJN-P), the Indonesian Civil Code, and the Regulation of the Minister of Law Number 22 of 2025. The findings establish that a deed minute unsigned due to a notary's death is not extinguished in juridical terms but undergoes a degradation of status from an authentic deed to a private deed, retaining limited evidentiary force pursuant to Articles 1869 and 1867 of the Civil Code, provided the parties acknowledge it. This condition is rooted in the normative obscurity of Article 44 paragraph (5) of UUJN-P, which regulates only violations by a living notary and fails to accommodate overmacht arising from death — a deficiency empirically demonstrated to generate divergent practitioner interpretations, thereby directly impairing legal certainty. Non-litigious remedies, namely deed cancellation followed by the execution of a new deed before a different notary, facilitated by the MPND-appointed Temporary Notary Official, constitute the most appropriate resolution mechanism.
Optimizing Student Practice Work Governance With The Information Technology Infrastructure Library (ITIL) V4 Approach Istikoma; Huyearka Usady; Rangga Aditya Saputra
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 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.v6i2.663

Abstract

The Practical Work (KP) process in the Information Systems Study Program at Muhammadiyah University of Pontianak still faces obstacles, such as the absence of reporting standards, limited partner information, monitoring difficulties, and an assessment system that is not yet transparent and integrated. This research aims to optimize KP service governance using the ITIL V4 approach with a focus on Service Request Management, Service Desk, and Continual Improvement. The research result is a website-based application that supports the KP process in an integrated manner, starting from determining location, managing daily logbooks, to online guidance documentation. This system also facilitates educational staff and supervisors to monitor student activities in real-time, so that the evaluation process becomes more objective and accountable. Testing with Black Box Testing ensures all functions run as required, while User Acceptance Testing (UAT) results in a satisfaction level for KP partners of 91%, students of 89%, and Study Program Admins of 95% (strongly agree category). This system is expected to improve efficiency, service quality and KP governance in a sustainable manner.
Evaluation of Methyl Ester Sulfonate (MES) and Ammonium Lauryl Sulfate (ALS) Surfactant Characteristics under Temperature and Salinity Variations for Enhanced Oil Recovery Applications Pauhesti Pauhesti; Sri Feni Maulindani; Apriandi Rizkina Rangga Wastu; Harin Widiyatni; Ade Kurniawan Saputra; Ni Wayan Nanik Juliantari
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 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.v6i2.717

Abstract

This study evaluates the characteristics and effectiveness of two anionic surfactants, palm oil-based Methyl Ester Sulfonate (MES) and synthetic detergent-based Ammonium Lauryl Sulfate (ALS), for chemical Enhanced Oil Recovery (EOR). Tests were performed at five concentrations (0.5–1.7%) under two salinities (4,000 and 15,000 ppm) and two temperatures (60°C and 90°C), evaluating density, aqueous stability, phase behavior, interfacial tension (IFT), and oil recovery via coreflooding on Berea sandstone cores. Density decreased with rising temperature but increased with concentration for both surfactants. MES at 1.1% and 4,000 ppm salinity formed the most stable Winsor Type III middle-phase emulsion at 60°C, persisting 14 days, with the lowest IFT (0.05112 mN/m, low IFT). At 15,000 ppm, the optimum MES concentration shifted to 1.4–1.7%, also yielding stable middle-phase emulsions. ALS formed a middle-phase emulsion only under limited conditions (0.5%; 4,000 ppm; 60°C), with poor stability and a much higher IFT (1.6348 mN/m). Coreflooding showed MES 1.1% achieved the highest cumulative recovery factor (RF) of 82.76%, a 27.59-point gain over waterflooding, outperforming ALS 0.5%, which reached only 54.38% RF with a 20.00-point gain. Overall, MES is recommended as the superior EOR surfactant for sandstone reservoirs with low-to-moderate salinity and temperatures up to 60°C.
Effects of an Urban Home Gardening Program on Plant Diversity and Home Garden Structure in Malang City, Indonesia Erona Wafaretta; Riyan Riyadlun Najih; Amaliah Amriani Amran Saru; Muh. Syaiful Akbar
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.v6i3.763

Abstract

Residential home gardens are important components of urban green spaces that contribute to biodiversity conservation, food security, and public health. This study examined the effects of an Urban Home Gardening Program on home garden structure and plant diversity in Malang City, Indonesia. A total of 95 households were surveyed, comprising participants in the government program (JGP) and non-participants (NJGP). Data on home garden typology, plant composition, abundance, and plant diversity were analyzed using descriptive statistics, chi-square tests, and independent-samples t-tests. Three home garden types were identified: ground, mixed, and vertical/rooftop. Mixed gardens predominated among JGP households (48%), whereas ground gardens were more common in NJGP households (56%). Ornamental plants were the dominant plant group, followed by vegetables, fruits, medicinal plants, tubers, and staple food crops. JGP households maintained significantly higher plant diversity (13 vs. 8.4 varieties; p < 0.05) and a greater proportion of medicinal plants (59% vs. 32%; p = 0.013) than NJGP households. These findings indicate that the Urban Home Gardening Program primarily enhances plant diversity and promotes multifunctional home gardens rather than simply increasing plant abundance. The program therefore has considerable potential to strengthen urban biodiversity conservation, household food security, and the sustainable use of medicinal plants.
Effectiveness of Seed Biopriming Using Indigenous Rhizobacteria From The Rhizosphere of Upland Rice In Improving The Growth of Local Upland Rice On Ultisol Soil La Ode Safuan; Gusti Ayu Kade Sutariati; Abdul Madiki; Muhidin; Tresjia Corina Rakian; I Made Widana Arsana; I Kadek Pande Prasetia Wiguna; Vit Neru Satrah; Arga Wiradama
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.v6i3.771

Abstract

Ultisol soils are widely distributed in Southeast Sulawesi and are characterized by low fertility, acidic pH, low organic matter content, and limited availability of essential nutrients. These constraints contribute to the low productivity of local upland rice and require sustainable technologies that can improve plant growth with lower dependence on synthetic inputs. This study aimed to evaluate the effectiveness of seed biopriming using indigenous rhizobacterial isolates from the rhizosphere of upland rice on the growth of local upland rice cultivated on Ultisol soil. The experiment was arranged in a randomized block design consisting of ten treatments: nine rhizobacterial isolates, namely KNW01, KNW03, KNW05, KNW09, KNW12, BTN15, KNS8, MN06, and BMB01, and a non-inoculated control. Each treatment was replicated three times. The observed variables included plant height, number of leaves, leaf area, number of tillers, root length, plant dry weight, and relative growth rate. The results showed that seed biopriming with indigenous rhizobacteria improved the growth performance of upland rice compared with the control. Isolate KNW05 consistently produced the best response across most growth variables, including plant height of 120.7 cm, leaf area of 1,622 cm², root length of 37.9 cm, plant dry weight of 24.3 g, and relative growth rate of 2.5 g/g/week. KNW05 also increased the number of tillers by 87% compared with the control. These findings indicate that indigenous rhizobacteria, particularly isolate KNW05, have potential as biofertilizer candidates to support sustainable upland rice cultivation on Ultisol soil.
Analysis Of Pipe Welding Quality Control Using The Seven Tools Method In The Manufacturing Industry Bornon Tapubolon; 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.v6i3.775

Abstract

Weld quality plays an important role in ensuring the reliability and safety of pipe products in the manufacturing industry. Welding defects may increase production costs, require rework, and reduce operational efficiency. This study aims to identify welding defects, determine the dominant defect types, analyze their root causes, and propose quality improvement strategies using the Seven Quality Control (Seven QC) Tools. The research applied Check Sheet, Histogram, Pareto Diagram, Fishbone Diagram, Scatter Diagram, Flow Chart, and P-Control Chart (P-Chart). Data were collected from January to June 2026, consisting of 3,090 welded joints with 209 defective welds. The results showed an overall defect rate of 6.76%, with porosity as the most dominant defect (38.28%), followed by crack (25.36%) and undercut (17.70%). Pareto analysis indicated that these three defects contributed 81.34% of the total defects. The P-Chart confirmed that the welding process remained statistically under control, while the Fishbone Diagram identified man, machine, method, material, measurement, and environment as the main causes of defects. The proposed improvements include operator training, strict implementation of the Welding Procedure Specification (WPS), preventive maintenance, improved material control, and enhanced inspection procedures to reduce welding defects and improve product quality.
Quality Assurance Analysis Using The Six Sigma Dmaic Method To Reduce Product Defects Dedy Ariyanto; 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.v6i3.776

Abstract

Forklifts are essential material handling equipment that play a significant role in supporting operational activities in manufacturing companies. The high intensity of forklift usage increases the risk of equipment failure, resulting in higher downtime and reduced operational effectiveness. This study aims to analyze the operational effectiveness of Forklift 1 using the Overall Equipment Effectiveness (OEE) method and to propose maintenance improvements to enhance forklift reliability and operational performance. This research employs the Overall Equipment Effectiveness (OEE) method, which consists of three main indicators: Availability Rate, Performance Efficiency, and Quality Rate. The data were collected through observations, interviews, documentation, and historical records of Forklift 1 operations and maintenance. The results indicate that before the proposed maintenance improvements were implemented, the OEE values were relatively low, reaching 36.9% in October, 63.8% in November, and 18.8% in December. After implementing a preventive maintenance schedule based on 540 operating hours, the OEE values improved significantly to 99.8% in January, 81.2% in February, and 99.8% in March. These findings demonstrate that the implementation of the OEE method effectively improves forklift operational performance by reducing downtime, increasing equipment reliability, and optimizing maintenance scheduling. Therefore, the OEE method can serve as an effective reference for improving productivity and operational efficiency in manufacturing companies.
Analysis of Factors Causing Decrease In Heating, Ventilation, and Air Conditioning (HVAC) Performance Using A Cause Effect Diagram (Fishbone Diagram) Hardimam Arbi; 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.v6i3.777

Abstract

The Heating, Ventilation, and Air Conditioning (HVAC) system is a supporting facility that functions to regulate temperature, humidity, air circulation, and indoor air quality to ensure smooth production processes. A decline in HVAC system performance can increase energy consumption, extend downtime, and reduce overall operational effectiveness. This study aims to identify the factors causing the decline in HVAC performance using the Cause-and-Effect Diagram (Fishbone Diagram). The research was conducted on the Air Handling Unit (AHU) at PT XYZ Batam using maintenance and failure data collected from January to December 2025. The research methods included field observations, documentation, and analysis based on the 6M approach, consisting of Man, Machine, Method, Material, Measurement, and Environment. The results showed a total of 61 failure incidents, with the most dominant failure being dirty air filters accounting for 18 cases (29.51%), followed by dirty cooling coils with 12 cases (19.67%), and worn blower belts with 9 cases (14.75%). The Fishbone Diagram analysis indicated that the Machine and Method factors were the primary causes of HVAC performance degradation, mainly due to dirty filters, contaminated cooling coils, and ineffective preventive maintenance practices. The proposed improvements include routine component cleaning, scheduled preventive maintenance, regular calibration of measuring instruments, the use of standard compliant spare parts, and technical training for maintenance personnel. Implementing these recommendations is expected to improve HVAC system reliability, reduce failure frequency, enhance energy efficiency, and support sustainable industrial operations.
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.

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