Mulawarman University

Copper radiators are widely used in automobiles due to their high thermal conductivity. However, they are prone to corrosion, which can lead to reduced vehicle performance. This study aimed to identify the chemical components of copper radiator parts and evaluate corrosion inhibition by keruing oleoresin as a natural, eco-friendly coating material. The research involved determining the chemical elements of copper radiator parts using emission spectroscopy and assessing the corrosion rate of copper radiator parts coated with keruing oleoresin in distilled water conditions using electrochemical tests. The results showed that a 5 % concentration of keruing oleoresin provided the best corrosion inhibition, with an OCP of 0.124 V, a corrosion rate of 0.00673 mm/year, and an inhibition efficiency of 88.15 %. The study demonstrates the potential of keruing oleoresin as a natural corrosion inhibitor for copper radiators, helping prevent corrosion and maintain radiator efficiency.

The escalating global demand for high-quality animal-derived proteins has driven the search for sustainable alternatives. Black soldier fly larvae (BSFL; Hermetia illucens L.) oil presents a promising option, by addressing organic waste management while providing nutrient-rich feed. This study evaluated the effects of dietary supplementation with BSFL oil on growth performance, hematological characteristics, and blood lipid profiles in mice (Mus musculus). Male mice were randomly assigned to five groups (n = 5): positive control (fish oil, 5 mL/kg body weight [BW]), negative control (Aquadest, 5 mL/kg BW), and three treatment groups receiving BSFL oil at 2.5, 5, and 10 mL/kg BW, respectively. Interventions were administered orally for 28 days; assessments included BW, hematological parameters, and lipid profiles. The results indicated that 10 mL/kg BW BSFL oil significantly increased BW (34.40 +/- 0.74 g) compared to the fish oil group (31.6 +/- 0.67 g, p < 0.05). Hematological parameters and lipid profiles did not differ significantly across groups (p > 0.05). However, leukocyte profiles exhibited significant variations (p < 0.05), particularly at 10 mL/kg BW of BSFL oil, suggesting immunomodulation. This preliminary proof-of-concept study in mice provides the first head-to-head comparison of unrefined BSFL and commercial fish oil utility, offering mechanistic insights applicable to livestock nutrition.

PurposeTo map and synthesize research on the patterns of associations between social media use and psychological well-being among higher-education populations.Design/methodology/approachBibliometric review of 467 Web of Science records (articles/reviews; searched date: December 11, 2024) spanning 2019 to 2024. We applied bibliographic coupling and co-word analysis using VOSviewer with standardized keywords (stemming, stop-word removal; minimum co-occurrence threshold; and association-strength normalization).FindingsFour robust clusters emerged: (1) pandemic-related stress and disparities; (2) FoMO/social comparison and affect; (3) problematic or excessive use and its correlates (anxiety, depression, loneliness); and (4) technology affordances, engagement, and subjective well-being. These findings reflect recurrent patterns in the literature rather than causal effects. Active/meaningful use is often linked to social support and life satisfaction, whereas passive, exposure-heavy, or dysregulated use is often linked to stress and poor well-being.Research limitations/implicationsReliance on a single, English-language database may under-represent region-specific scholarship and introduce citation lag and publication-language bias. Consistent with bibliometric methods, the results describe associations rather than causal relationships.Practical implicationsProvides evidence-informed guidance for universities and student counselling services to support digital-hygiene education and platform-sensitive, prevention-focused interventions.Social implicationsClarifies opportunities to foster connectedness while identifying risk profiles and usage patterns that warrant prevention.Originality/valueThis study provides a transparent, open, and reproducible network-level mapping centered on higher-education cohorts and platform-sensitive insights.

Companies strive to improve performance by adopting a green supply chain, integrating suppliers and customers to maintain product quality through supplier selection decisions. The purpose of this study is to examine the relationship between supplier selection decision-making and firm performance, with supply chain integration, green supply chain practice, and supply chain quality as intervening variables. Data collection was conducted at manufacturing companies by distributing questionnaires directly to practitioners and providing online links for respondents to complete. The results of data collection for this study amounted to 174 questionnaires ready for further processing using SmartPLS. The results of data processing show that supplier selection decision-making directly influences supply chain integration and green supply chain practice but does not directly impact supply chain quality. Supply chain integration plays a direct role in improving green supply chain practice, supply chain quality, and company performance. The green supply chain practice established within the company can improve supply chain quality and company performance. The company's ability to implement supply chain quality standards in its product production can improve its performance. The practical contribution of the research provides enlightenment for managers in designing appropriate policies and procedures in supplier selection that not only consider costs, but also encourage integration, implementation of green practices, improvement of supply chain quality, and ultimately strengthen company performance. (c) 2026 by the authors; licensee Growing Science, Canada

Reliable indicators of early soil biological change remain limited in tropical agroecosystems, where soil organic carbon (SOC) stocks may respond more slowly than microbial processes. We evaluated whether seasonal vegetation dynamics derived from Sentinel-2 fractional vegetation cover (FVC) are associated with spatial variation in SOC stock and microbial indicators in Jembrana, Bali, Indonesia. We mapped seasonal FVC from 2019 to 2024 and derived site-level metrics of mean cover and temporal variability (standard deviation, anomaly, coefficient of variation, and a temporal stability index). In July 2023, we sampled topsoil (0-30 cm) at 12 sites representing contrasting land uses and topographic settings. We calculated SOC stock from organic carbon concentration, bulk density, and sampling depth, and measured basal respiration and culturable microbial density (colony-forming units, CFU). Vegetation cover peaked consistently during the wet season (December to February), and mean site FVC ranged from 0.31 to 0.99. Mean FVC showed positive but non-significant associations with culturable microbial density (Spearman's p = 0.48, P = 0.114) and basal respiration (p = 0.29, P = 0.361), whereas higher vegetation variability metrics tended to coincide with lower culturable microbial density (p =-0.43 to-0.51, P = 0.090 to 0.163). SOC stock showed near-zero coefficients and no statistical evidence of association with vegetation metrics (p = 0.09, P = 0.781) or microbial indicators (p = 0.01, P = 0.975). Principal component analysis of FVC traits explained 99.65% of the variance and separated sites along a gradient from stable, high cover to more variable, lower cover. Overall, FVC stability metrics captured spatial differences that were directionally consistent with microbial indicators, but associations were not statistically significant in this dataset (n = 12). Larger, replicated studies with repeated soil sampling are required to evaluate whether seasonal FVC metrics have robust predictive utility for SOC stock and soil biological indicators.