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All Journal Review of Management, Accounting, and Business Studies Jurnal Akademika Kimia
Kurniawan, Niko
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Chemistry Economics, Econometrics & Finance Education

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Gamers' interest in microtransaction activities at valve corporation Sari, Desak Made Febri Purnama; Kurniawan, Niko; Sumarningsih, Ni Made; Basmantra, Ida Nyoman
Review of Management, Accounting, and Business Studies Vol. 5 No. 2 (2024)
Publisher : Universitas Pendidikan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38043/revenue.v5i2.5639

Abstract

The rapid growth of the online gaming industry has led to the rise of microtransactions, which have become a core component of the gaming experience. Valve Corporation, a prominent player in this industry, implemented a widely recognized microtransaction model through its platform. This study explored the factors influencing gamers in Bali to engage in microtransaction activities offered by Valve Corporation. Specifically, it investigated the effects of functional quality and price utility on purchase interest, with enjoyment serving as a mediating factor. The research targeted gamers in Bali who had previously engaged in microtransactions, employing an Accidental Sampling technique to collect data from 112 respondents. The analysis utilized Structural Equation Modeling - Partial Least Squares (SEM-PLS) to test the hypotheses. The findings revealed that functional quality and price utility both had significant positive effects on enjoyment and purchase interest. Furthermore, enjoyment not only directly influenced purchase interest but also mediated the effects of functional quality and price utility on purchase interest. These results highlight the critical role of enjoyment in shaping gamers’ decisions to participate in microtransactions, offering valuable insights for companies aiming to optimize their gaming platforms.
Atmospheric Corrosion Inhibition of Steel Using Tea Leaf Extract in the Coastal Environment of Air Tawar, Padang Kurniawan, Niko; Saputra, Sabrizal; Dinalia, Dinalia; Yerimadesi, Yerimadesi; safitri, sauli
Jurnal Akademika Kimia Vol. 14 No. 2 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i2.pp123-131

Abstract

This study evaluates the effectiveness of tea leaf extract as a corrosion inhibitor for steel under real coastal atmospheric exposure. The novelty of this work lies in its direct assessment of a plant-derived inhibitor in an open-air marine environment, a setting that has not been adequately addressed in previous studies, which have largely focused on controlled aqueous systems. In addition, this study employs mature tea leaves, an abundant agricultural byproduct with naturally high tannin content, processed through a simple, solvent-free extraction method, thereby offering a sustainable route for green inhibitor development. The extract was obtained from mature tea leaves through aqueous boiling, and its tannin content was quantified using UV–Vis spectrophotometry. ASSAB 760 steel specimens were coated by immersion in tea extract at varying concentrations and soaking durations, followed by natural exposure in a coastal environment for 1 to 30 days. Corrosion behavior was evaluated using the weight loss method. The results showed that mature tea leaves contained the highest tannin concentration (29530.95 ppm), supporting their selection for inhibitor application. The optimum extract concentration was identified as 11000 ppm with a 5-hour immersion time. Under these conditions, treated steel exhibited a substantially lower corrosion rate (7.78 × 10⁻⁵ g/cm²/day) compared to untreated steel (1.66 × 10⁻⁴ g/cm²/day), corresponding to a maximum inhibition efficiency of 84.71%. The inhibition mechanism is attributed to the formation of a stable Fe³⁺–tannin chelate complex that adsorbs onto the steel surface, forming a protective film that restricts the ingress of aggressive chloride-rich moisture in the coastal atmosphere. Overall, the findings demonstrate the practical viability of mature tea leaf extract as an effective and environmentally benign atmospheric corrosion inhibitor, providing field-relevant insight into sustainable protection strategies for marine-exposed steel infrastructure.
Co-Authors Basmantra, Ida Nyoman Desak Made Febri Purnama Sari Dinalia, Dinalia Safitri, Sauli Saputra, Sabrizal Sumarningsih, Ni Made Yerimadesi Yerimadesi