Văn Hiến University

Plasmonic nanomaterials (Au, Ag, Pt, and Cu) have attracted attention for enhanced spectroscopic sensing applications. Different approaches have been developed for nanostructure synthesis. In this study, high aspect ratio silver nanowires were successfully synthesized using the polyol method. During the preparation step, iron (III) chloride was introduced as a catalytic agent to help the nanowires development. The influence of FeCl3 reduction time on the morphology and plasmonic behavior of silver nanowires was systematically investigated. The UV-Vis spectra of silver nanowires presented a main absorption peak around 400 nm and a prominent shoulder around 350 nm. Scanning electron microscopy images confirmed the micrometer-scale lengths and narrow diameters. Furthermore, low-cost Surface-Enhanced Infrared Absorption Spectroscopic substrates were fabricated by depositing silver nanowires onto filter paper. Owing to the strong localized surface plasmon resonance of metallic nanostructures, the silver nanowires-based substrates enabled ultrasensitive detection of Eosin Y down to 10 ppb. The study highlighted the key role of iron (III) chloride in silver nanowire synthesis and demonstrated the facile economical preparation of silver nanowire-on filter-paper substrates as chemical sensors for trace-level detection.

Objectives: This study evaluated the accuracy of an artificial intelligence (AI)-based cephalometric software (WebCeph version 2.0.0.) compared with manual tracing and determined whether stratifying patients by chronological age or dentition stage provides a more clinically relevant assessment of AI accuracy. Methods: Three hundred lateral cephalometric radiographs of Vietnamese patients were traced manually by an orthodontist (reference standard) and analyzed automatically by WebCeph. Intra-observer reliability was validated using ICC and Dahlberg's error. We analyzed the data using three stratification strategies: (1) Overall; (2) Chronological age (<18, 18-25, >25 years); and (3) Dentition stage (<9 primary-early mixed, 9-12 late mixed, >12 permanent). The primary outcome was the absolute measurement difference (∣Δ∣), analyzed using the Kruskal-Wallis test and effect size (η2). Results: Overall, WebCeph showed high concordance with manual tracing (ICC > 0.80 for most parameters). Chronological age stratification showed weak associations with measurement error; differences between groups were largely non-significant (p>0.05) with a small effect size (η2≈0.015). In contrast, the dentition stage revealed significant performance disparities (p<0.05). Notably, accuracy for the Mandibular Arc (ICC = 0.349) and Mandibular Plane Angle (p=0.048) degraded significantly in the primary-early mixed group, a vulnerability obscured by chronological age-based stratification. Conclusions: Dentition stage is a more sensitive and biologically relevant predictor of AI accuracy than chronological age. While WebCeph is reliable for permanent dentition, accuracy degrades significantly in the primary-early mixed phase. Clinicians should prioritize manual verification of mandibular and incisor landmarks in mixed-dentition children.

Background: Internet addiction has emerged as a widespread concern, particularly among adolescents. Despite this growing issue, there is a scarcity of empirical data regarding the socio-demographic factors of internet addiction among high school students in Vietnam. Therefore, this study aimed to investigate the extent of internet addiction and its associated factors among Vietnamese high school adolescents. Methods: This analytical cross-sectional study was conducted from February to March 2025 among Vietnamese high school students. Internet addiction was assessed using the Internet Addiction Test – Short Version (IAT-SV), alongside data on demographics, academic performance, and psychosocial factors. Statistical analyses, including independent t-tests, one-way ANOVA, Post-Hoc Test, and multiple linear regression, were applied to explore differences between these variables and internet addiction. Results: A total of 789 students participated in the study, with a mean IAT-SV score of 28.79 (SD = 9.41). Female students (M = 29.84) and older students (M = 30.24) exhibited significantly higher internet addiction scores. Similar trends were observed among students with a family history of psychological disorders (M = 32.48) or smoking addiction (M = 31.22). Higher internet addiction scores were also found among students from families with difficult or very difficult economic conditions (M = 32.37), those reporting lower levels of happiness (M = 33.16), and those who perceived their academic environment negatively (M = 33.59). In contrast, lower scores were observed among male and younger students, those without such family histories, from families with moderate economic status, who reported being happy or very happy, and who viewed their academic environment positively. The regression model was statistically significant and accounted for 7.4% of the variance in internet addiction scores. Conclusion: Several factors are associated with internet addiction. Notably, fostering a supportive academic environment and enhancing students’ overall well-being and happiness may contribute to reducing the prevalence of internet addiction. Further research is warranted to explore effective strategies for addressing internet addiction among adolescents.

This study examines the influence of corporate social responsibility (CSR) dimensions on sustainable tourism development at tourist destinations in the Mekong Delta. The research employs the Partial Least Squares (PLS) method using a two-stage approach to analyze data collected from a sample of 320 tourists who had previously visited destinations across six provinces in the Mekong Delta: Tien Giang, Ben Tre, Dong Thap, Can Tho, Kien Giang, and An Giang. The data analysis results indicate that all proposed hypotheses are supported, except for the impact of legal responsibility on sustainable tourism development in the region. Moreover, the findings reveal that tourist satisfaction plays a mediating role in the relationship between ethical responsibility, economic responsibility, and philanthropic responsibility with sustainable tourism development in the Mekong Delta. In contrast, the mediating role of tourist satisfaction in the relationship between legal responsibility and sustainable tourism development is not supported. These findings provide useful insights for tourism managers, travel companies, and local authorities to reassess their strategic framework, identify key drivers, and determine effective approaches to enhance the tourism sector’s performance in the Mekong Delta. Consequently, the study suggests appropriate and practical policies and strategies to promote the sustainable development of tourism in the region.

In the domain of mobile robots (MRs) utilizing multi-wheel directional control, position synchronization in steering wheels remains a challenging problem, particularly when implemented in permanent magnet steering wheels for vertical tank robots. Addressing this critical problem, this paper presents a position synchronization control strategy that integrates a mean deviation coupling strategy (MDCS) with state feedback tracking control (SFTC) enhanced by integral action. In essence, MDCS minimizes position synchronization errors, especially during deviations or fluctuations, while SFTC enables fast responses to state changes and improves adaptability in uneven terrain. Combined with integral action, SFTC compensates for static errors, enhancing long-term stability. Furthermore, to establish robust evidence for the proposed strategy, this paper validates the results through both simulation and experimental analysis. Initially, simulation results show that integrating the MDCS with SFTC improves settling time, reducing it from 0.6 to 0.4 s. Additionally, experimental tests demonstrated that the improvement in settling time closely matched the simulation results during the reference angle change phase, excluding the initial startup phase. Without the synchronization strategy, the settling time was 0.5 s, whereas applying the control strategy increased it to 0.7 s. This discrepancy arises from the selected MDCS control coefficients, which were not well-suited to the actual system, leading to ineffective compensation signal intervention. As a result, the system dynamics were altered, and the stability of the poles was no longer ensured compared to the original selection. It can be concluded that the integration of MDCS with SFTC holds strong potential for practical application in steering wheels, improving synchronization while reducing the computational burden on hardware.