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All Journal Jurnal Otomasi Kontrol dan Instrumentasi Journal of Energy, Material, and Instrumentation Technology Jurnal Pustaka AI : Pusat Akses Kajian Teknologi Artificial Intelligence
Nazuwatussya'diyah, Nazuwatussya'diyah
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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Effect of Corona Plasma Radiation on the Contact Angle and Wettability of Bamboo Surface Alfajrin, Achmad Chalid Afif; Muhlisin, Zaenul; Komariah, Rahma Nur; Putra, Bintang Ridzky Ranindra; Nazuwatussya'diyah, Nazuwatussya'diyah; Arzi, Yudha Hamdi; Mardhiyatna, Mardhiyatna; Sari, Rizki Yustisia
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 2 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v6i2.294

Abstract

Bamboo is a widely utilized non-timber forest product, often innovated into laminated boards, particle boards, and plywood. The outer bamboo surface (skin) possesses high compressive strength but exhibits hydrophobic properties, limiting its wettability toward liquids. Plasma corona technology, operating at atmospheric pressure and using surrounding gases at a relatively low cost, offers a promising solution to modify bamboo surfaces by increasing their surface energy. This study aimed to analyze the hydrophilic resistance and wettability of bamboo surfaces treated with plasma corona, measured through contact angle analysis. The direct drop method was employed by dripping water and phenol formaldehyde (PF) fluids onto bamboo surfaces treated with plasma corona. Contact angle measurements were performed using ImageJ drop analysis software. Results demonstrated that plasma corona treatment significantly reduced contact angle values, improving surface wettability. Untreated bamboo surfaces showed contact angles of 72.7° for water and 111.5° for PF fluids, indicating limited wettability. Post-treatment, the contact angles decreased to less than 30° for water and below 90° for PF, signifying enhanced wettability. However, the hydrophilic properties were found to be non-permanent, with contact angle values gradually increasing over 13 days of observation. Among the tested parameters, plasma corona treatment with a current strength of 75 mA for 5 minutes provided the most optimal wettability improvement for water and PF fluids. This study highlights the effectiveness of plasma corona in enhancing bamboo surface wettability, making it more suitable for applications requiring adhesive bonding or fluid spreading in industrial processes.
Analisis Sentimen Digital Publik terhadap Perguruan Tinggi Negeri Menggunakan Google Review: Studi Kasus ITERA Sari, Rizki Yustisia; Nazuwatussya'diyah, Nazuwatussya'diyah; Mardhiyatna, Mardhiyatna
Jurnal Pustaka AI (Pusat Akses Kajian Teknologi Artificial Intelligence) Vol 5 No 2 (2025): Pustaka AI (Pusat Akses Kajian Teknologi Artificial Intelligence)
Publisher : Pustaka Galeri Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55382/jurnalpustakaai.v5i2.1163

Abstract

Transformasi digital telah mengubah cara masyarakat menyampaikan opini terhadap institusi publik, termasuk perguruan tinggi. Salah satu bentuk opini digital tersebut adalah ulasan pada platform Google Review yang dapat diolah untuk memahami persepsi publik secara real time. Penelitian ini bertujuan untuk menganalisis sentimen masyarakat terhadap Institut Teknologi Sumatera (ITERA) sebagai representasi persepsi digital terhadap perguruan tinggi negeri. Keterbaruan studi ini terletak pada pemanfaatan data ulasan publik dari platform terbuka dan dinamis sebagai indikator alternatif dalam mengevaluasi kualitas layanan institusi pendidikan tinggi dalam ekosistem digital. Metode yang digunakan adalah pendekatan analisis sentimen berbasis leksikon menggunakan algoritma Valence Aware Dictionary and sEntiment Reasoner (VADER), setelah proses translasi data dari Bahasa Indonesia ke Bahasa Inggris. Dari 1.683 data ulasan awal, diperoleh 504 data bersih yang layak dianalisis. Hasil menunjukkan bahwa 62,1% ulasan bersentimen positif, 31,3% netral, dan 6,5% bersifat negatif. Aspek yang paling banyak diapresiasi meliputi fasilitas kampus, aksesibilitas, dan layanan akademik. Temuan ini menunjukkan bahwa opini digital publik terhadap ITERA cenderung positif dan dapat menjadi masukan strategis dalam pengembangan mutu institusi pendidikan berbasis teknologi dan kecerdasan buatan.
Kontrol Adaptif Referensi Model untuk Netralisasi pH dalam Pengolahan Air Limbah Batik Nazuwatussya'diyah, Nazuwatussya'diyah; Ekawati, Estiyanti; Pradipta, Justin
Jurnal Otomasi Kontrol dan Instrumentasi Vol 18 No 1 (2026): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2026.18.1.4

Abstract

The batik industry generates wastewater with elevated pH levels due to sodium hydroxide usage in dyeing processes, frequently exceeding the regulatory standard of pH 6–9. Traditional dilution methods prove economically inefficient, necessitating more adaptive control strategies. This research designs and simulates a nonlinear adaptive control system based on Model Reference Adaptive Control (MRAC) for pH neutralization using acetic acid. The Continuous Stirred Tank Reactor (CSTR) mathematical model was developed from mass balance, acid-base equilibrium, and electroneutrality principles, then simulated using Ordinary Differential Equation (ODE) functions in MATLAB. MRAC performance was compared with conventional PI controller across various initial wastewater pH conditions. Simulation results demonstrate that MRAC achieves faster convergence, reaching pH 7 in 2488.68 seconds from initial pH 9, compared to PI controller (3080.96 seconds) or uncontrolled system (10225 seconds). With settling time of 2377 seconds versus 2566.4 seconds for PI, MRAC reduces neutralizer consumption by 0.61% (9.5380 L versus 9.5969 L) while maintaining safety criteria above the lower pH bound of 6.80. Lyapunov stability analysis confirms the asymptotic stability of the adaptive controller. This study demonstrates that MRAC offers superior performance for batik wastewater pH control while reducing dependency on uneconomical dilution methods.
Co-Authors Alfajrin, Achmad Chalid Afif Arzi, Yudha Hamdi Ekawati, Estiyanti Justin Pradipta Komariah, Rahma Nur Mardhiyatna, Mardhiyatna Putra, Bintang Ridzky Ranindra Sari, Rizki Yustisia Zaenul Muhlisin