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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 213 Documents
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Strengthening the Gyeongsangbuk–West Java Sister Province Relationship through Cultural Exchange at the 8th Global Youth Camp Muthi Najwa Hanifa; Windy Dermawan
International Journal of Science and Environment (IJSE) Vol. 5 No. 4 (2025): November 2025
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i1.282

Abstract

This study analyzes the subnational cooperation between West Java Province, Indonesia, and Gyeongsangbuk-do Province, Republic of Korea, through the 8th Global Youth Camp 2025. Held on August 17–23, 2025, in collaboration with Sangji Catholic University, the event gathered youth delegates from six Asian countries to promote intercultural understanding and regional collaboration. Using a descriptive–qualitative approach, the research explores how this program reflects West Java’s paradiplomacy efforts within Indonesia’s foreign policy framework. The findings show that West Java’s participation strengthens its international presence, enhances youth capacity, and expands global partnerships while aligning with Indonesia’s public diplomacy goals. The cooperation also demonstrates how subnational diplomacy can balance national interests with regional development needs. Overall, the West Java–Gyeongsangbuk-do partnership serves as a model for effective paradiplomacy that fosters mutual growth, people-to-people connections, and sustainable international engagement
Clinical Functional Profile of the Hands of Patients with Rheumatoid Arthritis at Royal Prima Hospital Medan Coray Carolyn Ruth Pardede, Eifel; Alexander, Rico; Chiuman, Linda
International Journal of Science and Environment (IJSE) Vol. 5 No. 4 (2025): November 2025
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v5i4.284

Abstract

Rheumatoid arthritis (RA) is a chronic autoimmune disease that frequently causes progressive joint damage, particularly in the hands, resulting in impaired functional ability in daily activities. This study aims to describe the hand function of patients with rheumatoid arthritis based on age, gender, and family history at Royal Prima Hospital Medan. This research employed a descriptive quantitative design with a cross-sectional approach involving 55 respondents who met the inclusion criteria. Data were collected using a structured hand function questionnaire assessing right hand, left-hand, and bilateral hand function across various activities. Data analysis was conducted using univariate and bivariate descriptive methods through cross tabulation. The results showed that hand function impairment was most prominent in patients aged >40 years, who predominantly fell into the “poor” function category. Female respondents demonstrated a higher level of functional limitation compared to males. Meanwhile, a family history of RAcontributed as a predisposing factor but did not directly correlate with the severity of functional impairment. Patients with a family history tended to fall within the “moderate” category, while more severe impairment was observed among those without a family history. Older age and female gender are major factors associated with reduced hand function in RA patients, whereas family history serves as a predisposition rather than a determinant of severity.
Optimization of Bio-Additive Formulation Using Subang Citronellal, Clove, and Patchouli: Evaluation of Density, Power Output, and CO₂–O₂ Emissions Rahmawati, Rahmi; Aprilliani, Fenny; Muhammad Malikul Adil, Nur
International Journal of Science and Environment (IJSE) Vol. 5 No. 4 (2025): November 2025
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i1.285

Abstract

This research examined the potential of essential oil–based bio-additives derived from citronella, clove, and patchouli to enhance the physicochemical properties, engine performance, and emission characteristics of Pertalite fuel. The study utilized Response Surface Methodology (RSM) with a Central Composite Design (CCD) to assess additive concentrations between 0.1 and 0.3 mL per liter of Pertalite. Findings indicated that these low-level additions did not significantly affect density, which remained similar to pure Pertalite. Likewise, power output and exhaust emissions (CO2 and O2) showed no notable improvements. Statistical evaluation using Design Expert® revealed all regression models were non-significant (p > 0.05), and optimization attempts failed to identify a valid optimum, with desirability values below 0.5. The minimal impact is attributed to the very low additive dosage, insufficient to influence atomization, combustion, or emission reduction. Additionally, gasoline’s non-polar nature limits sensitivity to parameters such as pH, while operational variations during engine testing (temperature, RPM, and load) may have masked minor effects. In summary, essential oil bio-additives at concentrations below 0.03% by volume are ineffective for measurable improvements. Future studies should investigate higher concentrations, purification of active compounds, improved blending techniques, and stricter engine testing protocols. The contribution of oxygenated compounds to combustion enhancement also merits further exploration.

Page 22 of 22 | Total Record : 213

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