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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 421 Documents
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Study of Greenhouse Gas Emission on the Semarang-Demak 1A Toll Road Project Saputra, Arditya Panca; Prasetyo Nugroho, Andri; Angelia Ginting, Febriyanti; Abdillah Nurusman, Habib
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.v6i2.476

Abstract

This study estimates carbon dioxide (CO₂) greenhouse gas (GHG) emissions during the construction phase of the Semarang–Demak Toll Road Project 1A. Motivated by the significant contribution of the infrastructure sector to global GHG emissions, hence the problem formulation is focused on identifying the main emission sources. The aim of the study is to reveal the dominant emission sources and to formulate decarbonization recommendations to reduce environmental impacts and support national emission reduction targets. The study employs a quantitative approach based on the Technical Guidelines for Estimating CO₂ GHG Emissions in Road Construction (No. 07/P/BM/2014) issued by the Directorate General of Highways, Ministry of Public Works and Public Housing, which adapts the IPCC methodology using emission calculation formulas and specific emission factors. Activity data from January 2023 to October 2025 were analyzed according to emission Scopes and work divisions based on General Specifications Revision 3. A qualitative approach complements the analysis by evaluating the effectiveness of decarbonization strategies through observation and document review. The results show total emissions of 6,942,173 tons CO2-eq, with Scope 3 dominating 5,688,286 tons CO2-eq (81.957%) from Division 10 Concrete Structures due to intensive cement production, Scope 1 at 741,235 tons CO2-eq (10.677%), and Scope 2 at 512,652 tons CO2-eq (7.385%). Decarbonization strategies include Green Construction, innovation in work methods and technology, BIM integration in Lean Construction, monitoring based on PP No. 22/2021, AMDAL, and RKL-RPL, and the use of renewable energy such as solar power plants (PLTS) and solar panels for Scope 2 electricity supply.
Enhancing Vinasse Treatment Efficiency using Electro-Fenton: The Role of Electrode Thickness and Power Supply Voltage Suprianti, Lilik; Nur Cahyani, Friska; Deardo HP, Andreas; Nurma Wahyusi, Kindriari; Noor Indah, Nindia
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.v6i2.478

Abstract

The production of ethanol from molasses generates vinasse as a by-product of the distillation process. Vinasse waste produced by PT Energi Agro Nusantara contains COD and BOD levels of 910.5 ppm and 460.5 ppm, respectively, which significantly exceed the maximum limits set by wastewater quality standards, necessitating treatment. One treatment method is the use of Advanced Oxidation Processes (AOPs), which utilize hydroxyl radicals to oxidize organic pollutants in vinasse. One such process is the electro-Fenton process. In this study, 500 ml of vinasse was placed in a beaker and stirred for 90 minutes. A 25 ml addition of hydrogen peroxide was made, with a 2 cm gap between the iron electrode plates. Voltage variations of 3V, 6V, 9V, and 12V, along with electrode thicknesses of 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm, were tested. COD and BOD levels were analyzed using the titrimetric method. The results showed that increasing the voltage and electrode thickness reduced COD and BOD levels, while the percentages of COD and BOD removal increased. The highest voltage (12V) and electrode thickness (6 mm) yielded the lowest final COD and BOD values of 163.5 ppm and 88.9 ppm, respectively, with COD removal at 82% and BOD removal at 81%.
Analysis of Air Quality Problems in the Engine Room Using the USG method Kadek Ceisa Ari Putri Laksmi; Agus Prawoto; Dyah Ratnaningsih; Antonius Edy Kristiyono; Intan Sianturi
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.v6i2.481

Abstract

Air quality in a ship's engine room significantly impacts crew health and operational safety, yet the priority of the problem remains underexplored in the Indonesian maritime context. This study analyzes air quality issues in the engine room of KM Sabuk Nusantara 101 using the USG (Urgency, Seriousness, Growth) method. With a quantitative cross-sectional survey design, data were collected through a Likert-scale questionnaire from a purposive sample of 30 engineers (Chief to 4th Engineer) with at least one year of experience in the engine room. The instrument was validated (r_hitung > 0.374) and reliable (Cronbach's α > 0.80) using SPSS. The analysis included descriptive statistics and calculation of USG scores for problem ranking. The results showed gas leaks as the top priority (USG score 13.66), followed by bilge odor (11.56) and increased temperature (11.34). In conclusion, routine seal repair, daily bilge cleaning, and blower optimization are recommended to reduce USG scores by up to 20 percent, improving crew safety and compliance with IMO 2020 regulations.
The Influence of Service, Price, and Promotion on Online Transportation User Decisions in Medan Alamsyah Harahap, Rahmat; Nicolas Sibarani, Eszra; Romaito Siahaan, Melisa; Victoria M Pangaribuan, Riris; T Telaumbanua, Frida
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.v6i2.482

Abstract

Online transportation first became popular in Indonesia with the arrival of Gojek in 2010. There are several online transportation services available in Medan, such as Grab, Gojek, Maxim, and InDrive. Service issues include inconsistency in service delivery, drivers who are unfriendly and unprofessional. Pricing issues include price differences between application platforms and complex fare structures. Promotional issues include excessive reliance on promotions to attract new users and a lack of user education on promotions in payment methods. Quantitative descriptive research is the research method, and explanatory research is the nature of the research. Interviews, questionnaires, and documentation studies are the data collection methods. Multiple linear regression with classical assumption testing, namely normality, multicollinearity, and heteroscedasticity, is the method of analysis. The research population consists of 300 users, 171 of whom were selected through simple random sampling divided into 21 sub-districts in Medan, and the validity and reliability were tested on 30 of them. The simultaneous effect of service, price, and promotion (F-test) has a positive effect on the success rate. Fcount 34.524 > Ftable 2.66 with sig. 0.000 < 0.05. Partially (t-test), service tcount 4.883 > ttable 1.65392 and sig. 0.000 < 0.05, price tcount 1.494 < ttable 1.65392 and sig. 0.137 > 0.05, promotion tcount 1.769 > ttable 1.65392 and sig. 0.079 > 0.05. The adjusted Rsquare coefficient test result is 0.372, meaning that 37.2% of the decision to use online transportation services in Medan is influenced by service, price, and promotion, while the remaining 62.8% is explained by other factors.
Ecopedagogic: The Influence of Geography Learning On Environmental Care Attitudes Rohsulina, Pranichayudha
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.v6i2.483

Abstract

Environmental problems are closely related to low levels of environmental awareness and attitudes. Students’ environmental care attitudes are influenced by educational processes, particularly Geography learning, which integrates ecological and spatial perspectives. This study aims to analyze the influence of Geography learning on students’ environmental care attitudes. The research employed a quantitative approach using a simple linear regression model with a sample of 41 students. Data were collected through questionnaires, interviews, and documentation. The novelty of this study lies in integrating ecopedagogic perspectives into Geography learning to strengthen environmental care attitudes among high school students. The results show that Geography learning has a significant positive effect on environmental care attitudes, with a correlation coefficient of 0.516 and a coefficient of determination of 26.67%. This indicates that improving the quality of Geography learning contributes to enhancing students’ environmental awareness and attitudes.
Analysis of the Effect of Cooling Water Temperature on Thermal Efficiency in the Main Engine of the MV Pritha Lely Widyaningrum; Agus Prawoto; Dyah Ratnaningsih; Antonius Edy Kristiyono; Intan Sianturi
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.v6i2.486

Abstract

Main engines in marine diesel vessels require optimal cooling systems to maintain thermal efficiency amid fluctuating operational loads. This study analyzes the effect of coolant temperature on thermal efficiency of the main engine aboard MV Pritha. Employing a quantitative descriptive-analytic approach, data were collected from operational parameters (RPM, inlet/outlet coolant temperatures, fuel oil consumption) during 12-month sea practice (Sep 2024-Jul 2025). The population comprised all engine data at 70-80% stable load; purposive sampling yielded 30-50 daily observations. Instruments included ship-standard thermometers, flow meters, and tachometers, analyzed via simple linear regression (Y = 64.183 - 0.395X), Pearson correlation (r = 0.995), and ANOVA in SPSS. Results revealed significant negative correlation; 1°C coolant increase temperature reduces thermal efficiency by 0.395% (Sig. < 0.001). Conclusions recommend real-time coolant monitoring and routine maintenance to optimize fuel efficiency and engine longevity.
The Effect of Product Quality and Service Quality on Customer Satisfaction in TikTok Shop: The Mediating Role of Brand Image Simanjuntak, Ahmad Yusuf Fauzan; Siburian, Suparman J; Pardede, Bryan Carlos Yeremia; Jamaluddin
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.v6i2.487

Abstract

This study aims to examine the effects of product quality and service quality on customer satisfaction in TikTok Shop, with brand image serving as a mediating variable. This study employed a quantitative research approach. The population consisted of active students in North Sumatra who had purchased products through TikTok Shop. Using purposive sampling, 400 respondents were selected. Data were collected through an online questionnaire measured on a five-point Likert scale and analyzed using Structural Equation Modeling-Partial Least Squares (SEM-PLS) with SmartPLS. The findings reveal that brand image has a positive and significant effect on customer satisfaction. Service quality also has a positive and significant effect on both brand image and customer satisfaction. In contrast, product quality does not have a significant effect on either brand image or customer satisfaction. Furthermore, brand image significantly mediates the relationship between service quality and customer satisfaction, but it does not mediate the relationship between product quality and customer satisfaction. These results suggest that service quality and brand image shape customer satisfaction in TikTok Shop more strongly than product quality. This suggests that, within the social commerce context, consumers place greater emphasis on service experience and digital brand perception in evaluating satisfaction. This study is limited to active students in North Sumatra and focuses only on product quality, service quality, brand image, and customer satisfaction. This study enriches the literature on social commerce by highlighting the dominant role of service quality and brand image in explaining customer satisfaction on TikTok Shop and offers practical insights for sellers in enhancing customer experience and strengthening brand image.
The Effect of Price and Promotion on Customer Satisfaction With Service Quality as a Mediating Variable at Leslie Rent Car in Medan Leslie, Daniel; Hutagaol, Jarungjung
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.v6i2.488

Abstract

This study examines the effect of price and promotion on customer satisfaction with service quality as a mediating variable at Leslie Rent Car in Medan. The research was designed to identify the main factors that shape customer satisfaction in the car rental service sector and to test whether service quality acts as an important mechanism linking marketing variables to customer satisfaction. A quantitative approach was employed using survey data collected from 382 active customers of Leslie Rent Car in Medan. The data were analyzed using Structural Equation Modeling based on Partial Least Squares (SEM-PLS), including measurement model evaluation, structural model testing, and hypothesis testing. The results show that all indicators met the requirements of convergent validity, discriminant validity, and reliability, indicating that the measurement model was acceptable. In the structural model, customer satisfaction was explained by price, promotion, and service quality with an R-square value of 0.510, while service quality was explained by price and promotion with an R-square value of 0.035. Hypothesis testing revealed that price had a positive and significant effect on service quality and customer satisfaction. Service quality also had a positive and significant effect on customer satisfaction and was found to be the strongest predictor in the model. In addition, service quality significantly mediated the relationship between price and customer satisfaction. However, promotion did not have a significant effect on service quality or customer satisfaction, and service quality did not mediate the effect of promotion on customer satisfaction. The study concludes that customer satisfaction at Leslie Rent Car is primarily influenced by fair and appropriate pricing as well as the actual quality of service experienced by customers. Service quality plays a central role in transforming price perceptions into customer satisfaction, while promotion alone is not sufficient to improve either service quality or satisfaction. These findings suggest that improving vehicle condition, punctuality, staff friendliness, driver competence, and special attention should become the company’s primary strategic focus.
Digital Innovation and Organizational Agility Towards Improving Business Performance In Digital Startup Companies In Indonesia Quraysin, Icin; Rizki Amalina, Dira; Mustofiyah, Ely; Sofiaty, Eva; Pratama , Sukma
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.v6i2.489

Abstract

This study aims to analyze the influence of digital innovation and organizational agility on business performance in digital startup companies in Indonesia. The research approach used was quantitative with a survey method. The study population was employees at digital startup companies that have adopted digital technology, with a sample of 120 respondents selected using a purposive sampling technique. Data collection was conducted through a questionnaire with a Likert scale of 1–5. Data analysis used validity tests, reliability tests, classical assumption tests, and multiple linear regression analysis. The results showed that digital innovation had a positive and significant effect on business performance. Organizational agility also had a positive and significant effect on business performance. Simultaneously, digital innovation and organizational agility were proven to have a significant effect on business performance with a significant contribution. This indicates that the higher the company's ability to develop digital innovation and improve organizational agility, the better the resulting business performance. This study implies that digital startups need to strengthen their innovation strategies and increase organizational flexibility to face increasingly dynamic business competition in the digital era.
Global Trends In Digital Business: The Role of Artificial Intelligence, Big Data and The Platform Economy In Technology Startups In Indonesia Quraysin, Icin; Desian, Aan; Aninda Balqis, Aninda; Wibowo, Raditia; Putriana, Putriana
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.v6i2.492

Abstract

This study aims to analyze global trends in digital business through the role of artificial intelligence, big data, and the platform economy in technology startups in Indonesia. The research approach uses a descriptive qualitative method with the help of NVivo software to analyze data from interviews, observations, and documentation. The study was conducted from November 2025 to January 2026, involving startups from the e-commerce, fintech, edutech, and other digital service sectors. The results show that artificial intelligence contributes to improving operational efficiency, customer service automation, and transaction security. Big data plays a crucial role in strategic decision-making, consumer behavior analysis, and determining more accurate marketing strategies. Meanwhile, the platform economy has proven effective in expanding markets, increasing user connectivity, and creating scalable business models. However, Indonesian startups still face challenges such as limited digital talent, high technology implementation costs, intense market competition, and data protection issues. This study concludes that the integration of artificial intelligence, big data, and the platform economy is a strategic factor in strengthening the competitiveness of Indonesian startups in the global digital economy era. Support from an innovation ecosystem, adaptive regulations, and multi-stakeholder collaboration are needed for sustainable startup growth.

Page 41 of 43 | Total Record : 421

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