IoT-Based 100 WP Solar Power Plant for Ultraviolet Lighting in Dragon Fruit Cultivation: Design and Performance Comparison of Tracking and Non-Tracking Systems

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The use of solar energy for agricultural applications can reduce dependence on conventional electricity while enabling operation in locations where grid access is limited. This study aimed to design and evaluate a 100 Wp photovoltaic system integrated with an Internet of Things (IoT) monitoring and control system for lighting in a dragon fruit plantation. The system employed a 100 Wp monocrystalline solar panel, a solar charge controller, a battery storage unit, an inverter, an ESP32 microcontroller, voltage and current sensing, and Telegram as the remote monitoring interface. Electrical parameters were observed hourly from 09:00 to 17:00 WIB under two panel configurations: solar tracking and fixed non-tracking. Panel voltage, panel current, battery voltage, and calculated panel power were analyzed. For the tracking configuration, the average panel voltage and current were 19.64 V and 4.12 A, respectively, corresponding to an average calculated power of 81.47 W. The maximum calculated power was 100.94 W at 12:00. Under the non-tracking configuration, the average voltage and current were 18.69 V and 3.61 A, with an average calculated power of 68.08 W and a maximum of 91.65 W at 12:00. Thus, the tracking configuration produced approximately 19.7% higher average calculated panel power than the non-tracking configuration. The ESP32–Telegram system successfully transmitted operating information in real time when a stable Internet connection was available. The results demonstrate that combining solar tracking with IoT monitoring can improve the observed electrical performance and facilitate remote management of a small off-grid photovoltaic lighting system.

Experimental Study of Cyclotron-Related Electromagnetic Waves and Their Interaction with Electronic Circuits

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Electromagnetic fields generated by systems involving charged-particle motion are important in accelerator physics, microwave engineering, and electromagnetic compatibility (EMC). A cyclotron accelerates charged particles by the coordinated action of a magnetic field and a radio-frequency (RF) electric field, while accelerated charges and time-varying fields provide a general physical basis for electromagnetic radiation (Lawrence & Livingston, 1932; Wiedemann, 2015). The present study investigates, experimentally, how microwave electromagnetic fields interact with electronic circuits and uses a magnetron-based laboratory source as an accessible experimental model for phenomena related to charged-particle electromagnetics. The apparatus consisted of a high-voltage power-supply/transformer unit, high-voltage capacitor, microwave magnetron, electrical connecting leads, and a metallic enclosure lined internally with aluminium. The electromagnetic response of a mobile phone, digital camera, calculator, radio, and lamp was observed. At an initial source-to-device separation of approximately 30 cm, temporary functional disturbances were observed, and the disturbances generally became more pronounced when the devices were moved closer to the source. Inside the aluminium-lined enclosure, the response was spatially non-uniform: some positions produced stronger disturbances than others. This behaviour is physically consistent with reflection from the conducting enclosure and interference between incident and reflected microwave fields, producing spatial maxima and minima. The mobile phone showed screen instability and temporary touch-response disturbance at some positions, while the radio, calculator, digital camera, and lamp also exhibited abnormal responses. The study interprets these observations through electromagnetic coupling, induced voltage/current, frequency-dependent susceptibility, and spatial field redistribution. Because calibrated measurements of field strength, power density, and exact operating frequency were not performed, the results are reported as qualitative evidence of electromagnetic susceptibility rather than as calibrated failure thresholds. The work provides an experimentally accessible bridge between accelerator-physics concepts, microwave generation, and EMC and offers a basis for future quantitative measurements.

Effects of Varied Nitrogen Fertilization Rates on Yield and Growth parameters of Hybrid Maize under agro-climatic conditions of Nangarhar, Afghanistan

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Nitrogen is one of the most essential nutrients influencing the growth, development, and productivity of maize (Zea mays L.). This study was conducted to evaluate the effects of different nitrogen fertilization rates on the growth and yield performance of hybrid maize under the agro-climatic conditions of Nangarhar, Afghanistan. The experimental treatments consisted of four nitrogen fertilization rates; 0, 130, 160 kg and 190 kg N ha⁻¹, Nitrogen fertilizer was applied in form of Urea (46%N) in three split application ¼ dose at sowing, ½ at knee high stage and ¼ at tasseling stage. The experiment was conducted as randomized complete block design (RCBD). The results showed that the application of 190 kg N ha⁻¹, produced significantly higher values than the other treatments for plant height (244 cm), stem diameter (3.58 cm), number of leaves per plant (15.83), cob length (22 cm), number of grain per cob (455), grain weight per cob (133.17 g), 1000-grain weight (300 g), biological yield (808 g), fresh cob yield (8.33 kg), fresh net grain yield per cob (153.17 g). The lowest values were recorded under the control treatment (0 kg N ha⁻¹) across all plant growth and yield parameters.
Therefore, this article recommends 190 kg N ha⁻¹ for farmers in the region and in similar climatic regions to achieve good maize growth and high yields.

ESP Students’ Perceptions of the Use of Technological Devices in Assessing English Listening Skills

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Nowadays, technology plays an increasingly vital role in language education. Recently, more and more educators and researchers have explored how technological devices can support the assessment of English listening skills. This study, therefore, aims to explore students’ perceptions of the use of technological devices in the assessment of listening skills in an ESP course, namely ‘English for Logistics’. More specifically, the research was conducted at Ho Chi Minh City College of Transport with the participation of 80 second-year ESP students majoring in Logistics. A mixed-methods research design was employed to collect both quantitative and qualitative data through the employment of a questionnaire and semi-structured interviews. For data analysis, descriptive statistics and content analysis were used. The findings revealed that the main purposes of using technological devices in assessing English listening skills include enhancing students’ listening skills and giving feedback to students via formative assessment. Besides, most students had positive perceptions of the use of technological devices in assessing listening skills in the course of English for Logistics, such as having convenience, increasing interest, saving time, and giving immediate feedback. In addition, the findings showed that distraction, anxiety, security, and technical problems were several major challenges of using technological devices in English listening.

Developing EFL Students’ Communicative Performance Through Experiential Cross-Cultural Interaction with International Tourists: A Mixed-Methods Study at TSES English Club

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The disconnect between formal language instruction and real-world communicative competence remains a core challenge in global EFL education. This convergent mixed-methods study examines an innovative experiential learning model at the TSES English Club in Ho Chi Minh City, Vietnam, where university students practise their English skills via structured, authentic interactions with international tourists in public spaces. The quantitative data, collected over an 18-week intervention period, comprised pre/post-test scores of 11 students assessed using a 100-point rubric, alongside student post-intervention perception surveys from 71 students and 7 expert facilitators. The qualitative data, gathered via semi-structured interviews with 3 facilitators and 5 students, underwent reflexive thematic analysis and were supplemented by ethnographic observation. Findings reveal significant practical communication score gains (t(10)=24.06, p<.001, d=7.25), indicating an extremely large effect. Post-intervention surveys indicated over 77% of students improved across all criteria. Thematic analysis revealed three primary catalysts: authentic communicative pressure, intrinsic motivation from meaningful cross-cultural exchange, and peer scaffolding with emotional support. Three principal barriers emerged: accent-triggered anxiety, cultural and pragmatic misunderstandings, and environmental noise. The study theoretically operationalises experiential learning and intercultural competence frameworks within this non-institutional, tourism-driven context. Practically, it offers ten evidence-based, actionable recommendations to maximise pedagogical impact for language clubs.

Factors Influencing the Quality of Cultural Tourism Experiences: Integrating Don Ca Tai Tu and Cai Luong Performing Arts in the Mekong Delta

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This article presents a conceptual framework and research protocol for investigating the factors that influence the quality of cultural tourism experiences associated with Đờn ca tài tử (Southern Vietnamese folk music) and Cải lương (Vietnamese traditional opera) in the Mekong Delta, Vietnam. Recognised by UNESCO as a Representative Intangible Cultural Heritage of Humanity in 2013, Đờn ca tài tử embodies the cultural soul of Southern Vietnam. Despite its heritage significance and the growing global shift toward experience-based tourism, the integration of these traditional performing arts into tourism offerings remains underdeveloped and empirically understudied. This article addresses three critical research gaps: the absence of an integrated theoretical framework combining Experience Economy Theory, Authenticity Theory, Co-creation Theory, Memorable Tourism Experience (MTE), and the Stimulus-Organism-Response (S-O-R) model; the lack of quantitative studies employing structural equation modelling in this context; and the scarcity of comprehensive research on cultural tourism experiences tied to these art forms in the Mekong Delta. The proposed research employs an exploratory sequential mixed-methods design, combining qualitative interviews with artisans, managers, and tourists, followed by a quantitative survey of 400-500 respondents analysed using PLS-SEM. This article contributes to the theoretical advancement of cultural heritage tourism research and offers practical implications for sustainable tourism development in the Mekong Delta.

Pharmacogenomics of Adverse Drug Reactions: Integrating Genetic Biomarkers into Precision Pharmacotherapy

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Adverse drug reactions (ADRs) remain a major global healthcare challenge, accounting for significant morbidity, mortality, treatment failure, and increased healthcare expenditure. Although clinical factors such as age, comorbidities, organ function, and polypharmacy contribute to ADR susceptibility, they inadequately explain the marked interindividual variability in drug response. Pharmacogenomics has emerged as a transformative approach to precision medicine by identifying inherited genetic variants that influence drug metabolism, transport, efficacy, and toxicity. This review critically examines the role of pharmacogenomic testing in predicting, preventing, and managing ADRs, with emphasis on clinically actionable pharmacogenes including CYP2D6, CYP2C19, TPMT, NUDT15, HLA-B15:02, HLA-B57:01, and HLA-B 58:01. Evidence from international pharmacogenomic guidelines demonstrates that genotype-guided prescribing significantly reduces severe hypersensitivity reactions, drug toxicity, and treatment failure while improving therapeutic efficacy and patient safety. The review further discusses current clinical applications, implementation challenges, ethical considerations, and emerging advances in genomic technologies, artificial intelligence, and clinical decision-support systems. The integration of pharmacogenomics into routine healthcare has the potential to optimize individualized drug therapy, minimize preventable ADRs, and accelerate the transition toward precision medicine, ultimately improving clinical outcomes and healthcare quality.

Service Quality, Citizen Satisfaction, and Citizen Participation: Evidence from Independent (PBPU) Members of Indonesia’s National Health Insurance Program

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Universal health coverage schemes in developing countries face a recurring sustainability problem: keeping voluntarily enrolled members active once they have joined. This study investigates how the five dimensions of service quality proposed in the SERVQUAL framework, namely tangibles, reliability, responsiveness, assurance, and empathy, shape the satisfaction of independent participants (Pekerja Bukan Penerima Upah/PBPU) of Indonesia’s Jaminan Kesehatan Nasional (JKN) programme administered by BPJS Kesehatan, and whether this satisfaction subsequently drives citizen participation. Data were obtained from 180 PBPU participants who had used BPJS Kesehatan services at least twice, selected through purposive sampling, and analyzed with Partial Least Squares Structural Equation Modeling (PLS-SEM) in SmartPLS. All five service-quality dimensions were found to exert a significant positive effect on citizen satisfaction, with responsiveness and empathy showing the strongest influence, while citizen satisfaction in turn had a strong positive effect on citizen participation and fully mediated the link between each service-quality dimension and participatory behavior. The measurement model satisfied established criteria for convergent and discriminant validity, and the structural model showed adequate explanatory and predictive relevance. The findings extend the SERVQUAL framework and expectation confirmation theory into the domain of participatory behavior and provide BPJS Kesehatan with practical direction for strengthening service delivery to sustain long-term member engagement.

Beyond Digitalization: Understanding Taxpayer Adaptation, Compliance Costs, and Voluntary Compliance in Indonesia’s Coretax Reform

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Indonesia’s implementation of the Core Tax Administration System (Coretax) represents a major shift toward integrated digital tax administration. This study examines how taxpayers and tax professionals adapt to Coretax, how the transition reshapes compliance costs, and how these experiences relate to voluntary tax compliance. A qualitative case study approach was employed involving 100 participants from Jakarta, Bandung, Surabaya, and Malang, including corporate taxpayers, tax and accounting staff, tax consultants, tax practitioners, academics, and tax administration officials. Data were collected through semi-structured interviews and analyzed using reflexive thematic analysis. The findings reveal that Coretax implementation is experienced not merely as technological change, but as an administrative transformation requiring procedural relearning, internal workflow adjustment, cross-functional coordination, and the development of new administrative capabilities. Six dimensions of compliance costs emerged: learning, time, monetary, organizational, technological, and psychological costs. These burdens were most pronounced during the early transition period, although some declined as users developed familiarity and administrative routines. The findings further show that digitalization alone does not automatically strengthen voluntary compliance. Participants associated willingness to comply more closely with procedural clarity, system reliability, accessible support, and trust in tax administration. The study contributes to digital tax administration literature by integrating taxpayer adaptation, administrative burden, compliance costs, and voluntary compliance within a single qualitative framework. Practically, it highlights the importance of user-centered implementation strategies that reduce transition burdens while strengthening taxpayers’ confidence in digital tax administration.

Rickets on the Rise: A Case Series Highlighting the Importance of Growth Monitoring and Nutritional Assessment in Preventing Rickets

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Nutritional rickets, though a preventable condition, continues to show an increased incidence in clinical practice. It is crucial to recognize these cases during early stages in order to prevent the progression from vitamin D deficiency to clinical rickets, with the potential for irreversible complications. This case series describes five pediatric patients in which vitamin D deficiency and rickets was identified by close observation through growth monitoring and nutritional assessment. These workups were conducted due to the initial presentation of failure to thrive in each of these cases, prompting further evaluation to identify the underlying causes of growth faltering. A common theme throughout was normocalcemia, however, it is important to understand that this finding does not rule out the potential for rickets, as both subclinical rickets and stage two compensatory rickets can lead to normal laboratory findings. Therefore, growth faltering should always prompt nutritional assessment because early recognition, growth monitoring, a well-balanced diet with calcium-rich foods, compliance with vitamin D supplementation, and consistent follow-ups are essential to prevent the risk of developing clinical rickets.