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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmiah Teknologi dan Rekayasa Indonesian Journal of Chemistry Prosiding Seminar Nasional Teknik Mesin Journal of Applied Materials and Technology Automotive Experiences
Manawan, Maykel
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Rancang Bangun Prototipe Case Powerbank dengan Solarcell sebagai Media Konversi Energi Panas ke Energi Listrik Rizka, Hawa; Gotama, Priya Esa; Manawan, Maykel; Sukandi, Agus
Seminar Nasional Teknik Mesin 2019: Prosiding Seminar Nasional Teknik Mesin 2019
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Smartphone yang merupakan salah satu contoh kemajuan teknologi di abad ini, yang membuktikkan bahwa kebutuhan manusia semakin tinggi dan menjadi kebutuhan vital, bisa digunakan diperjalanan dengan baterai yang telah diisi dengan pengisi daya sebelumnya. Kinerja baterai smartphone yang terbatas menyebabkan turunnya effisiensi daya baterai sehingga dapat membuat smartphone lebih cepat tereksploitasi baterainya dan membutuhkan pengisi daya yang dapat dibawa kemanapun. Dengan memanfaatkan energi matahari, inovasi powerbank akan membuat pengisian smartphone menjadi lebih mudah dan efisien secara tempat dan waktu. Inovasi yang diperlukan yaitu penambahan solarcell bagi penangkapan sinar matahari lalu dikonversi menjadi energi listrik dan superkapasitor untuk mempercepat pengisian daya bagi smartphone. Metode yang akan digunakan yaitu deskriptif dan eksperimen, yaitu dengan mengadakan survei bagi masyarakat terutama bagi pekerja lapangan seperti driver ojek online sebagai batasan masalah untuk penelitian guna keperluan produk yang dibuat lalu kami akan membuat produk sesuai kebutuhan konsumen dengan hasil yang diinginkan ialah pengisian daya baterai menjadi lebih mudah dan efisien secara waktu dan tempat
Coil Spring Failure Analysis Reviewed from Residual Stress, Crytal Orientation, and Texture Andoko, Andoko; Ananto, Rifqi Ryandi Dwi; Suryanto, Heru; Gapsari, Femiana; Manawan, Maykel
Automotive Experiences Vol 6 No 3 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9803

Abstract

Crystal defects can be identified through the crystallographic characteristics of crystal orientation (lattice), microstrain, and texture. Identification of crystal defects on the atomic scale through crystallography is very important in analyzing the mechanism of material properties due to the influence of dislocations. The slip mechanism is analyzed to minimize coil spring failure. This study aims to analyze the causes of coil spring failure based on crystallography. XRD testing was carried out for analysis of residual stress, crystal orientation, and texture using MAUD 2.94 version software. Hardness testing was carried out on the surface of the coil spring with locations near and far from the fracture using micro Vickers. The macro fracture morphology was analyzed using a DSLR camera and the micro fracture morphology was analyzed using SEM. The XRD result shows that the coil spring material has a tensile residual stress value of "202.4 ± 15.9 MPa" with the resulting crystal orientation showing the hkl (100), (200), (211), (200) fields. The plane (200) has a texture characteristic that is oriented towards the Rolling direction along the spring axis. Texture oriented towards Rolling Direction can be shown with a maximum probability value of 1.191. A high probability will have an impact on the presence of material surface defects. Surface defects are indicated by the presence of pit corrosion on micro and macro fracture morphology observations. The pit corrosion defects that occur in the failed coil springs are the beginning of the formation of crack initiation and cause stress concentration. The stress concentration will increase with loading and cause crack propagation.
Optimized Carbonization and Kinetic Analysis of Palm Kernel Shell Porous Carbon for Heavy Metal Adsorption Hafizah, Mas Ayu Elita; Manaf, Azwar; Valency, Tiara; Andreas, Andreas; Manawan, Maykel
Indonesian Journal of Chemistry Vol 25, No 3 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100714

Abstract

This study explores the use of porous carbon derived from palm kernel shells to adsorb lead ions (Pb2+) from water. Porous carbon was produced by carbonizing palm kernel shells at different temperatures (400, 600, and 800 °C) and was evaluated for its effectiveness in a lead chloride (PbCl2) solution. The best adsorption rate, reducing Pb2+ concentration by 27.5%, was observed by carbonized material at 800 °C with a 3 h contact time. Kinetic analysis suggested that the process followed a pseudo-second-order model, indicating that chemical adsorption was the dominant mechanism. The adsorption data were best described by the Freundlich isotherm, implying multilayer adsorption on an uneven surface. These findings highlight the efficient and low-cost potential of palm kernel shell-based porous carbon for removing heavy metals from wastewater. Palm kernel shell-derived porous carbon has proven to be a sustainable, cost-effective, and practical solution for mitigating Pb2+ contamination, positioning it as a promising candidate for environmentally friendly water treatment applications.
Synthesis and Characterization of Aluminated Santa Barbara Amorphous-15 via Ultrasonic-Enhanced Hydrothermal Method: Effects of Sonication, Solvent Acidity, and Si/Al Ratio Putri, Dini Hariyanto; Subagyono, RR Dirgarini Julia Nurlianti; Allo, Veliyana Londong; Manawan, Maykel
Jurnal Kimia Sains dan Aplikasi Vol 28, No 6 (2025): Volume 28 Issue 6 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.6.292-298

Abstract

Aluminated Santa Barbara Amorphous-15 (Al-SBA-15) materials were successfully synthesized using an ultrasonic-enhanced hydrothermal method. The synthesis was conducted by varying the mole ratio of Si precursor and Al precursor (10 and 20), sonication time (3 and 5 hours), and solvent type (2 M hydrochloric acid (HCl) and distilled water). The resulting materials were characterized using N2 sorption analyzer, Fourier Transform Infrared Spectroscopy (FTIR), Small-Angle X-ray Diffraction (SAXRD), Scanning Electron Microscopy (SEM), and Ammonia-Temperature Programmed Desorption (NH3-TPD). FTIR spectra confirmed the presence of siloxane, silanol, and hydroxyl functional groups in all Al-SBA-15 samples. SAXRD analysis showed three characteristic peaks of SBA-15, indicating a two-dimensional hexagonal structure (p6mm). Increasing the sonication time enhanced the surface area from 718 to 767 m2/g, while reducing the pore diameter from 5.96 to 4.81 nm and the pore volume from 1.07 to 0.92 cm3/g. Raising the Si:Al molar ratio slightly increased the surface area (718 to 722 m2/g) and decreased the pore diameter and volume. Additionally, using distilled water instead of 2 M HCl as the solvent raised the surface area from 722 to 785 m2/g, while decreasing the pore diameter from 5.61 to 5.05 nm and slightly lowering the pore volume. The acidity of the Al-SBA-15 material varied according to the sonication time and the amount of Al precursor used, suggesting the potential of regulating the acidic properties through optimization of the synthesis parameters.
Photo-Fenton of Dyes Degradation Using Covalent Triazine Frameworks: Toward Industrial Wastewater Treatment Applications Prawiranegara, Barata Aditya; Sugesti, Heni; Suhendri; Abid, Hussein Rasool; Azhar, Muhammad Rizwan; Rada, Zana Hassan; Manawan, Maykel; Utama, Panca Setia
Journal of Applied Materials and Technology Vol. 5 No. 2 (2024): March 2024
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.5.2.77-85

Abstract

A Covalent Triazine Framework (CTF-1) and carbon nanospheres (CS) were synthesized to develop a porous, thermally stable, and efficient photocatalyst for dye degradation in wastewater treatment applications. The synthesized composite material exhibited a high surface area exceeding 400 m²/g, a well-defined mesoporous structure, and excellent optical properties, including strong light absorption extending up to 550 nm and a moderate band gap of approximately 2.8 eV. These characteristics promote effective visible light-driven photocatalysis. The photocatalytic performance was assessed by degrading methylene blue (MB) as a model organic dye pollutant under photo-Fenton conditions. The system demonstrated high efficiency, with over 90% of the dye removed within 120 minutes of irradiation. The degradation followed pseudo-first-order kinetics, confirming the photocatalytic nature of the reaction. Parameter studies indicated that hydroxyl radicals (•OH) were the dominant reactive species responsible for dye degradation. Moreover, CTF-1 retained its photocatalytic activity and structural integrity over multiple reuse cycles, showcasing excellent reusability and stability. The integration of high surface area for dye adsorption, efficient photoactivation under visible light, and robust radical generation synergistically contributed to the enhanced degradation performance. The study highlights the promising role of CTF-1 and its composites as multifunctional materials for advanced oxidation processes. Given its effectiveness, durability, and environmental compatibility, CTF-1 presents a sustainable and scalable solution for the treatment of dye-laden industrial wastewater. This work contributes to the development of next-generation photocatalysts aimed at addressing global challenges in water pollution and environmental remediation.
Strategi Pemeliharaan Berbasis CBM+ pada Mesin TPE331 untuk Meningkatkan Keandalan Operasional: Studi Kasus Pesawat CASA 212-200 di PT NTP Ramadhani, Agita; Amperiawan, Gita; Manawan, Maykel; Gani, Erzi Agson; Furqon, M Zainal
Jurnal Ilmiah Teknologi dan Rekayasa Vol. 30 No. 3 (2025)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2025.v30i3.17

Abstract

Aircraft engine maintenance strategies have evolved from schedule-based approaches toward condition-driven systems that emphasize actual component health conditions. The TPE331 turboprop engine used on the CASA 212-200 aircraft is critical in supporting both military and civil aviation operations. However, its maintenance process faces challenges related to high operational intensity, diverse operating environments, spare part availability, and turnaround time. This research was conducted at PT Nusantara Turbin dan Propulsi (NTP) to analyze the existing maintenance system and to propose the implementation of Condition-Based Maintenance Plus (CBM+) as an optimization strategy. The research employed a qualitative descriptive approach using maintenance records, engine performance parameters, and operational cost data. The results show that CBM+ implementation has the potential to reduce unexpected downtime, improve cost efficiency by approximately 8–12%, and enhance fleet readiness through early detection of component degradation. This research demonstrates that CBM+ provides not only technical benefits but also strategic value in supporting the transformation of the national MRO industry toward data-driven maintenance practices.
Co-Authors Abid, Hussein Rasool Agus Sukandi Allo, Veliyana Londong Amperiawan, Gita Ananto, Rifqi Ryandi Dwi Andoko Andoko, Andoko Andreas Andreas Azhar, Muhammad Rizwan Azwar Manaf Femiana Gapsari MF Furqon, M Zainal Gani, Erzi Agson Gotama, Priya Esa Heru Suryanto Mas Ayu Elita Hafizah Prawiranegara, Barata Aditya Putri, Dini Hariyanto Rada, Zana Hassan Ramadhani, Agita Rizka, Hawa Subagyono, RR Dirgarini Julia Nurlianti Sugesti, Heni Suhendri Utama, Panca Setia Valency, Tiara