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All Journal Mechatronics, Electrical Power, and Vehicular Technology Padjadjaran Journal of Dental Researchers and Students Automotive Experiences
Agung Wibowo
Faculty Of Mechanical And Aerospace Engineering, Bandung Institute Of Technology
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Immunology & microbiology Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health

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Perbedaan nilai kekerasan permukaan semen Glass Ionomer (GIC) dan modifikasi resin semen Glass Ionomer (RMGIC) akibat efek cairan lambung buatan secara in vitro Nuni Maharani; Agung Wibowo; Dudi Aripin; Mohammad Richata Fadil
Padjadjaran Journal of Dental Researchers and Students Vol 1, No 2 (2017): Oktober 2017
Publisher : Fakultas Kedokteran Gigi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pjdrs.v1i1.22293

Abstract

Pendahuluan: Gastroesophageal reflux disease (GERD) didefinisikan sebagai reflex otot esophagus atau spincter, yang memungkinkan asam lambung bergerak naik melalui kerongkongan hingga masuk kedalam rongga mulut. Asam lambung memiliki pH berkisar 1 hingga 1.5, berada di bawah pH kritis email sebesar 5.5 yang dapat menyebabkan terjadinya demineralisasi email, dentin, dan sementum. Tujuan penelitian adalah untuk membedakan nilai kekasaran permukaan semen glass ionomer (GIC) dan modifikasi resin semen glass ionomer (RMGIC) akibat efek cairan lambung buatan.  Metode: Penelitian yang dilakukan merupakan penelitian eksperimental murni secara in vitro. Sampel dipersiapkan sebanyak 40 buah, yang terdiri dari 20 sampel semen glass ionomer (GIC) dan 20 sampel modifikasi resin semen glass ionomer (RMGIC). Seluruh sampel dibagi ke dalam 4 kelompok, masing-masing terdiri dari 10 sampel yaitu (1) kelompok GIC direndam dalam saliva buatan, (2) kelompok RMGIC direndam dalam saliva buatan, (3) kelompok GIC direndam dalam cairan lambung buatan selama 3 kali 7 menit dan setelahnya direndam kembali dalam saliva buatan, dan (4) kelompok RMGIC direndam dalam cairan lambung buatan selama 3 kali 7 menit dan setelahnya direndam kembali dalam saliva buatan. Perendaman dilakukan selama 9 hari. Nilai kekasaran diukur dengan menggunakan surface roughness tester (Profilometri). Hasil dianalisis secara statistik dengan menggunakan uji ANAVA dan analisis post-hoc dengan menggunakan t-test. Hasil: Terdapat perbedaan nilai kekasaran permukaan semen glass ionomer (GIC) dan modifikasi resin semen glass ionomer (RMGIC) akibat efek cairan lambung buatan. Simpulan: Paparan cairan asam lambung pada pasien GERD dapat mempengaruhi kekasaran permukaan bahan restorasi GIC dan RMGIC. Kata kunci: Gastroesophageal reflux disease, Kekasaran permukaan, semen glass ionomer, modifikasi resin semen glass ionomer, profilometri ABSTRACTIntroduction: Gastroesophageal reflux disease (GERD) is defined as involuntary muscle relaxing of the upper esophageal sphincter, which allows refluxed acid to move upward through the esophagus into the oral cavity. The gastric acid has pH between 1 and 1.5, far below the critical pH of 5.5 at which tooth enamel will dissolve. Gastric juice has been shown to demineralize enamel, dentin, and root cementum. Methods: Fourthy samples of each restorative material, a conventional glass ionomer cement (20 samples) and a resin modified glass ionomer cement (20 samples), were prepared and divided into four groups, each group consist of 10 samples. Group (1) group of GIC immersed in simulated saliva and group (2) group of RMGIC immersed in simulated saliva, both control groups immersed for 9 days. Group (3) were group GIC and group (4) were RMGIC, both groups immersed in simulated saliva for 9 days and in between both groups immersed in gastric juice every 3 times a day for 7 minute. Each group subjected to profilometric analysis. The profilometric values were statistically analyzed using ANOVA and 2-way analysis of variance (post-hoc). Results: There are differences between GIC and RMGIC after immersion in gastric juice. Conclusion: Surface roughness of all tested materials were affected by the simulated gastric juice.Keywords: Gastroesophageal reflux disease, surface roughness, glass ionomer cement, resin modified glass ionomer cement, profilometer
Geometrical and dimensional tolerance analysis for the radial flux type of permanent magnet generator design Muhammad Fathul Hikmawan; Agung Wibowo; Muhammad Kasim
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 12, No 2 (2021)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2021.v12.68-80

Abstract

Mechanical tolerance is something that should be carefully taken into consideration and cannot be avoided in a product for manufacturing and assembly needs, especially in the design stage, to avoid excessive dimensional and geometric deviations of the components made. This paper discusses how to determine and allocate dimensional and geometric tolerances in the design of a 10 kW, 500 rpm radial flux permanent magnet generator prototype components. The electrical and mechanical design results in the form of the detailed nominal dimensions of the generator components, and the allowable air gap range are used as input parameters for tolerance analysis. The values of tolerance allocation and re-allocation process are carried out by considering the capability of the production machine and the ease level of the manufacturing process. The tolerance stack-up analysis method based on the worst case (WC) scenario is used to determine the cumulative effect on the air gap distance due to the allocated tolerance and to ensure that the cumulative effect is acceptable so as to guarantee the generator's functionality. The calculations and simulations results show that with an air gap of 1 ± 0.2 mm, the maximum air gap value obtained is 1.1785 mm, and the minimum is 0.8 mm. The smallest tolerance value allocation is 1 µm on the shaft precisely on the FSBS/SRBS feature and the rotor on the RPMS feature. In addition, the manufacturing process required to achieve the smallest tolerance allocation value is grinding, lapping, and polishing processes.
Development of Battery Pack for Electric Motorcycle Complying with Safety Standard and Indonesia Regulation Robby Dwianto Widyantara; Dito Ata'ul Momin Wicaksono; Syafiq Ade Priyatama; Andika Pandu Nugroho; Raihan Wiradibrata; Anggi Regiana Agustin; Lei Tianqi; Agung Wibowo; Ignatius Pulung Nurprasetio; Bentang Arief Budiman
Automotive Experiences Vol. 8 No. 3 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.13442

Abstract

This paper presents a comprehensive design methodology and mechanical evaluation of an electric motorcycle battery pack that fulfills both international safety standards and Indonesian regulations. As the country with the world’s largest motorcycle fleet, Indonesia faces significant challenges in transitioning to electric mobility—particularly in preventing battery malfunctions and mitigating accident risks. The design process begins by defining minimum technical requirements, ensuring regulatory compliance, and addressing geometric constraints, then proceed with the development of component architectures in accordance with industry best practices. Detailed models of the pack and its subassemblies are subjected to finite element analysis to verify structural integrity under demanding operational conditions. Key performance targets include an IP68 ingress protection rating, sufficient rigidity to withstand vibrational loads, and impact resistance for accident scenarios. Simulation results confirm that the final design maintains mechanical robustness across a variety of load cases. Building on these findings, the paper offers specific recommendations to further enhance pack performance and safety. The described methodology is fully reproducible and provides practical insights for efficient product development, even when resources are limited.
Co-Authors Andika Pandu Nugroho Anggi Regiana Agustin Bentang Arief Budiman Dito Ata'ul Momin Wicaksono Dudi Aripin Ignatius Pulung Nurprasetio Lei Tianqi Mohammad Richata Fadil Muhammad Fathul Hikmawan Muhammad Kasim Nuni Maharani Raihan Wiradibrata Robby Dwianto Widyantara Syafiq Ade Priyatama