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All Journal Jurnal Teknik Industri Jurnal Pengajaran MIPA Indonesian Journal of Science and Technology IJoLE: International Journal of Language Education Communications in Science and Technology Jurnal Kartika Kimia Molekul: Jurnal Ilmiah Kimia JEDCHEM (JOURNAL EDUCATION AND CHEMISTRY) Jurnal Penelitian Enjiniring Fakultas Teknik Unhas Acta Chimica Asiana Science Midwifery Journal of Tropical Chemistry Research and Education Jurnal Abdimas Kartika Wijayakusuma Asean Journal of Science and Engineering (AJSE) ASEAN Journal of Science and Engineering Education (AJSEE) Indonesian Journal of Multidiciplinary Research (IJoMR) Indonesian Journal of Community and Special Needs Education (IJCSNE) Indonesian Journal of Educational Research and Technology (IJERT) Indonesian Journal of Teaching in Science International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) International Journal of Research and Applied Technology (INJURATECH) Automotive Experiences Journal of Mechanical Engineering, Science, and Innovation CHEMTAG Journal of Chemical Engineering Fraction: Jurnal Teori dan Terapan Matematika Journal of Engineering Environtmental Energy and Science Journal of Educational Sciences Indonesian Journal of Limnology Open Global Scietific Journal Jurnal Inovasi Teknologi Manufaktur, Energi dan Otomotif ASEAN Journal for Science and Engineering in Materials ASEAN Journal of Educational Research and Technology

Ragadhita, Risti

Universitas Pendidikan Indonesia

Author-ID : 3606611

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Nursing Public Health Social Sciences Transportation Veterinary Other

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Production of Brake Pad from Epoxy Resin: From Polymerization Concept to the Experiment with Analysis of Mechanical Properties Nandiyanto, Asep Bayu Dani; Fiandini, Meli; Al Husaeni, Dwi Novia; Ragadhita, Risti; Hofifah, Siti Nur
Jurnal Penelitian Enjiniring Vol 25 No 2 (2021)
Publisher : Center of Techonolgy (COT), Fakultas Teknik, Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jpe.112021.05

The purpose of this study was to determine the effect of variations in the use of catalysts on the performance of brake pads. The performance testing is compressive strength and puncture strength. The resin is formed from a mixture of Bisphenol A-epichlorohydrin and cycloaliphatic amine. Based on the results of the study, it was found that brake pads with samples B and C had better performance. The hardness values of samples A, B, and C are 307.4; 331.1; and 334.3 N, respectively. The ratio of resin and catalyst mixture affects the performance of the brake pad. The more catalysts added, the faster the hardening process. It is hoped that this research can be the basis for developing brake pads.

Innovation of Environmentally Friendly Solid Electrolyte Biobattery Based on Carrageenan and Rotten Tomatoes Widyaningsih, Mia; Abidin, Muhamad; Hafidh, Ashary Fathul; Murniati, Anceu; Ragadhita, Risti; Rizky, Karina Mulya; Mudzakir, Ahmad
ASEAN Journal of Science and Engineering Vol 4, No 1 (2024): AJSE: March 2024
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ajse.v3i3.49681

This research aims to create and evaluate the performance of environmentally friendly biobattery based on carrageenan and rotten tomatoes to reduce B3 waste. To make a biobattery based on carrageenan and rotten tomatoes, five ratios of carrageenan and rotten tomatoes mixtures were used with the composition of carrageenan values of 1, 2, 3, 4, and 5% for each type of battery. The parameters observed in this study were the potential difference, current strength, and stability of the biobattery. Carrageenan was added to prevent battery leakage and maintain battery stability. As a result, the biobattery has a potential difference value equivalent to a commercial battery, namely 1.5 V, but the current generated is still low. On the other hand, biobatteries can be applied to alarm clocks. The difference in carrageenan concentration has no significant effect on the value of potential difference, current strength, power, recharging ability, and application on wall clocks, as well as the stability of the biobattery. The experiment was carried out with the hypothesis that husk ash can absorb rotten tomatoes, preventing electrolyte leakage. However, the resulting biobattery is still leaking. After that, we modified it again by using electrolytes made from rotten tomatoes and coconut dregs, but the leakage was still the same. Therefore, the biobattery made from a combination of carrageenan and rotten tomatoes was assumed to keep the battery more stable and prevent leakage. This research was expected to contribute to the development of environmentally friendly batteries to reduce B3 waste, along with the increasing need for batteries in the era of industrial revolution 4.0.

Techno‐Economic Evaluation of The Production of Resin-Based Brake Pads using Agricultural Wastes: Comparison of Eggshells/Banana Peels Brake Pads and Commercial Asbestos Brake Pads Ragadhita, Risti; Al Husaeni, Dwi Fitria; Nandiyanto, Asep Bayu Dani
ASEAN Journal of Science and Engineering Vol 3, No 3 (2023): AJSE: December 2023
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ajse.v3i3.47362

The purpose of this study was to analyze, evaluate, and compare the results of the feasibility analysis of producing egg shells/banana peels brake pads and commercial asbestos brake pads based on engineering and economic perspectives. Mass balance and several economic parameters (i.e., gross profit margin (GPM), payback period (PBP), break-even point (BEP), cumulative net present value (CNPV), and profitability index (PI)) are calculated to analyze the feasibility projects based on engineering and economic perspectives, respectively. The process of analyzing the economic feasibility of the project is assumed to be in ideal conditions. The engineering perspective shows that the project of banana peels/egg shells brake pads and commercial asbestos brake pads are prospective if the fabrication uses simple apparatus on a large scale. Economic evaluations such as GPM, PBP, BEP, CNPV, and PI all returned positive results, indicating that the project has the potential for large-scale production. It is hoped that the research could well demonstrate the project's importance for future development and serve as a model for future production of brake pads made from agricultural waste.

Particulate Matter Emission from Combustion and Non-Combustion Automotive Engine Process: Review and Computational Bibliometric Analysis on Its Source, Sizes, and Health and Lung Impact Nandiyanto, Asep Bayu Dani; Ragadhita, Risti; Setiyo, Muji; Obaidi, Abdulkareem Sh. Mahdi Al; Hidayat, Arif
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.10259

This study aimed to comprehensively analyze particulate matter (PM) emissions from vehicles, focusing on their sources based on combustion and non-combustion process, classification (PM10, PM2.5, PM0.1), and health implications (including PM transportation into lungs). Employing bibliometric analysis, we assessed the growth of scientific publications related to PM, identifying top-cited works based on citations, publisher, author, country, and affiliation. We also visually mapped the development of research in this field using keyword-based publication data from Scopus (2019-2023) with the keywords "particulate matter", "emission”, and "particle size" by utilizing Publish or Perish and VOSviewer software. Our findings underscore a significant uptrend in particulate matter research, shedding light on key areas of investigation. This study serves as a valuable resource for academics seeking research direction and a reference point for future investigations.

Utilization of Bamboo Powder in The Production of Non-Asbestos Brake Pads: Computational Bibliometric Literature Review Analysis and Experiments to Support Sustainable Development Goals (SDGs) Nandiyanto, Asep Bayu Dani; Syazwany, Aisha Nadhira; Syarafah, Karina Nur; Syuhada, Themy Sabri; Ragadhita, Risti; Piantari, Erna; Farobie, Obie; Bilad, Muhammad Roil
Automotive Experiences Vol 7 No 1 (2024)
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.11109

This study aims to develop asbestos-free and environmentally friendly brake pads using apus bamboo powder (Gigantochloa apus). In the experiments, bamboo powder, resin, and catalyst were used as the raw materials and varied to ensure the quality of the prepared brake pads. To analyze the performance of brake pads, the fabricated brake pads are subjected to physicochemical tests (such as microscopic tests and functional group analysis) and mechanical tests (such as puncture tests, compression tests, and friction tests). The research results showed that adjusting the composition of the raw materials allowed a change in the performance of the brake pad, including porosity, morphological structure, and mechanical properties. Indeed, the condition of the low porosity on the inside of the brake pad strategically optimizes the compression strength of the material, making this design ideal for applications that require high resistance to compression loads. This study shows the possibility of apus bamboo powder as an alternative to asbestos in the production of non-asbestos brake pads, offering a safer and environmentally friendly solution as well as giving ideas for supporting current issues in the sustainable development goals (SDGs).

DESAIN REAKTOR UNTUK PRODUKSI NANOPARTIKEL ZnO Salsabila, Annisa Rizky; Bayu Dani Nandiyanto, Asep; Ragadhita, Risti
Jurnal Inovasi Teknologi Manufaktur, Energi dan Otomotif Vol. 1 No. 2 (2023): Jurnal Inovasi Teknologi Manufaktur, Energi, dan Otomotif
Publisher : Politeknik Negeri Banyuwangi

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

Studi tentang desain reaktor menjadi penting karena merupakan salah satu tahapan yang diperlukan dalam suatu desain proses dalam industri. Di samping itu, nanopartikel ZnO juga merupakan salah satu material dengan permintaan yang tinggi untuk diproduksi dalam skala industri karena kegunaannya yang luas. Penelitian ini bertujuan untuk mendesain reaktor yang akan digunakan dalam memproduksi nanopartikel seng oksida (ZnO). Dalam mendesain reaktor ini digunakan perancangan tipe Continuous Stirred Tank Reactor (CSTR), dimana komponen utama reaktor terdiri dari tangki dan pengaduk. Untuk merancang tangki dan pengaduk, perhitungan rancangan dilakukan dengan menggunakan aplikasi Microsoft Excel. Dari hasil perhitungan diperoleh spesifikasi tangki dengan volume 4.30 ft3, tinggi 219.73 in, dan diameter vessel 73.30 in, dengan satu pengaduk berdaya 7.68 Hp. Diharapkan penelitian ini dapat dijadikan acuan dalam merancang reaktor yang lebih efisien, ekonomis, dan handal dalam kegiatan produksi nanopartikel ZnO.

Attitudes of High Special School Students with Hearing Impairment to Online Adaptive Physical Education Learning Rusyani, Endang; Permana, Sidik; Ragadhita, Risti
Indonesian Journal of Teaching in Science Vol 2, No 1 (2022): IJOTIS: March 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

The research is quantitative descriptive research on the attitudes of high school students with hearing impairment towards learning adaptive physical education online in special schools based on phenomena happening right now. To find out the attitude of high school hearing impairment students towards adaptive physical education online learning, a method that was used in this research was a survey method at high special needs school in Bandung, while the data collection using a questionnaire. The results show that the attitude of high school students with hearing impairment towards online learning of physical education adaptive shows that 12.50% are included in the category very good, 12.50% included in the good category, 50% included in the category quite good, 12.50% is included in the poor category, 12.50% is included in the very poor category. Hopefully, subject teacher adaptive physical education can continue to provide motivation and understanding to students about the importance of adaptive physical education and creativity in teaching adaptive physical education though online thus students can be interested and show a very good attitude.

Practical Computation in the Techno-Economic Analysis of the Production of Magnesium Oxide Nanoparticles using Sol-gel Method Veronica, Jessica; Intan Febriani, Lidia; Nurhashiva, Citra; Ragadhita, Risti; Nandiyanto, Asep Bayu Dani; Kurniawan, Tedi
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol 2 No 2 (2021): International Journal of Informatics, Information System and Computer Engineering
Publisher : Universitas Komputer Indonesia

The purpose of this study was to determine the feasibility of a project for the manufacture of magnesium oxide nanoparticles using the sol-gel method by evaluating both technically and economically. Evaluation from the technical side is determined by stoichiometric calculations and evaluation of the initial factory design, while the evaluation from the economic side is determined by several parameters to determine the benefits of the project to be established (Gross Profit Margin, Internal Rate Return, Break-Even Point, Payback Period, and Cumulative Net Present Values). Some of these economic evaluation parameters were analyzed to inform the production potential of magnesium oxide nanoparticles, such as determining the level of profitability of a project (Gross Profit Margin), predicting the length of time required for an investment to return the initial capital expenditure (Payback Period), predicting the condition of a production project in the form of a production function in years (Cumulative Net Present Value), etc. The results of the technical analysis show that this project can produce 1,425 kg of magnesium oxide nanoparticles per day and the total cost of the equipment purchased is 45,243 USD. Payback Period analysis shows that the investment willbe profitable after more than three years. To ensure project feasibility, the project is estimated from ideal to worst-case conditions in production, including salary, sales, raw materials, utilities, as well as external conditions such as taxes

Desain Reaktor untuk Produksi Nanopartikel Nikel Ferit (NiFe2O4) Aulia Rahma, Sifa; Dani Nandiyanto, Asep Bayu; Ragadhita, Risti
Journal of Engineering Environtmental Energy and Science Vol. 2 No. 1 (2023): January 2023
Publisher : LPPMP Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/kvet5y65

Tujuan dari penelitian ini adalah untuk merancang reaktor sederhana tipe Continous Stirred Tank Reactor (CSTR) dan menganalisis reaktor melalui analisis komputasi dengan menghitung reaktor, pengaduk yang digunakan dan neraca massa menggunakan Microsoft Excel. Berdasarkan hasil perhitungan dimensi reaktor CSTR, diperoleh tekanan design sebesar 44,61 psig, tebal dan tinggi tabung silinder masing-masing 0,14 in dan 85,46 in, ketebalan tutup atas dan bawah tabung silinder adalah 0,15 in dan 0,23 in begitu pun ketinggian tutup atas dan bawah tabung silinder sebesar 9,63 in dan16,47 in serta tinggi reaktor sebesar 114,06 in. Tidak hanya itu, reaktor juga dilengkapi 1 pengaduk dengan diameter, tinggi, panjang dan lebar berturut-turut 28,49 in, 18,99 in, 7,12 in dan 5,70 in dengan daya pengadukan pada prosesnya sebesar 32,73 Hp. Penulisan artikel ini diharapkan menjadi referensi yang bermanfaat sebagai metode pembelajaran perancangan reaktor untuk menghasilkan produk nanopartikel nikel ferit (NiFe2O4) yang berpuluh ribu kali lebih besar dari skala laboratorium.

Isotherm adsorption characteristics of carbon microparticles prepared from pineapple peel waste Nandiyanto, Asep Bayu Dani; Santiuly Girsang, Gabriela Chelvina; Maryanti, Rina; Ragadhita, Risti; Anggraeni, Sri; Fauzi, Fajar Miraz; Sakinah, Putri; Astuti, Asita Puji; Usdiyana, Dian; Fiandini, Meli; Dewi, Mauseni Wantika; Al-Obaidi, Abdulkareem Sh. Mahdi
Communications in Science and Technology Vol 5 No 1 (2020)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

The objective of this study was to investigate isotherm adsorption of carbon microparticles from pineapple peel waste. Carbon microparticles were prepared by carbonizing pineapple peel waste at 215-250°C and grinding using a saw-milling process. To investigate adsorption properties of carbon microparticles, experiments were done by evaluating adsorption of curcumin (as a model of adsorbate) in the ambient temperature and pressure under constant pH condition. To confirm the adsorption characteristics, carbon particles with different sizes (i.e., 100, 125, and 200 ?m) were tested, and the adsorption results were compared with several standard isotherm adsorption models: Langmuir, Freundlich, Temkin, and Dubinin- Radushkevich. To support the adsorption analysis, several characterizations (i.e., optical microscope, sieve test, and Fourier transform infrared analysis) were conducted. The adsorption test showed that the adsorption profile is fit to the Freundlich model for all variations, indicating the multilayer adsorption process on heterogeneous surfaces and interactions between adsorbate molecules. The results from other isotherm models also confirmed that the adsorption process occurs physically via Van der Waals force in binding adsorbate on the surface of adsorbent.

Co-Authors A Nurdiana Abdulkareem Sh. Mahdi Al-Obaidi Abdulkareem Sh. Mahdi Al-Obaidi Abidin, Muhamad Adani Ghina Puspita Sari Adzra Zahra Ziva Agus Kamaludin, Agus Ahmad Aminudin Al Husaeni, Dwi Fitria Al Husaeni, Dwi Novia Al-Obaidi, Abdulkareem Sh. Mahdi Anceu Murniati Andika Purnama Shidiq Andika Purnama Shidiq Andri Syah Putra Anisa Noorlela Arif Hidayat Asep Bayu Dani Nandiyanto Asep Supriatna, Asep Astuti, Asita Puji Aulia Rahma, Sifa Bilad, M. Roil Bilad, Muhammad Roil Budi Susetyo Citra Nurhashiva Citra Nurhashiva Dewi, Mauseni Wantika Dian Usdiyana Dwi Novia Al Husaeni Dwi Novia Al Husaeni Eddy Soeryanto Soegoto Endang Rusyani Fadhillah, Farid Fatimah, Siti Fauzi, Fajar Miraz Fauzia Nur Awaliah Fiandini, Meli Fika Annisa Sabrina Fitri Febriyanti Hafidh, Ashary Fathul HERNANI - Hernawati, Ati Hofifah, Siti Nur Indra Mamad Gandidi Intan Febriani, Lidia Irine Sofianty Jessica Veronica L Astuti Lianawati, Maya Lidia Intan Febriani Mahmudatussa'adah, Ai Maya Lianawati Meli Fiandini Mentari Putri Aprilia Mia Widyaningsih Muhammad Aziz Muhammad Aziz Muhammad Roil Bilad Muji Setiyo Nia Sutisna, Nia Noorlela, Anisa Nurhashiva, Citra Nyoman Ayu Kristinawati Obaidi, Abdulkareem Sh. Mahdi Al Obie Farobie Piantari, Erna R P Dewi Ratnengsih, Een Rina Maryanti Rizky, Karina Mulya Rofi Fadilah Madani Rosi Oktiani Rusyani, Endang Saepulloh, Anwar SAKINAH, PUTRI Salsabila, Annisa Rizky Santiuly Girsang, Gabriela Chelvina Sidik, Adi Permana Sifa Aulia Rahma Siti Sriyati Sri Anggraeni Sri Rahayu Sukrawan, Yusep Syarafah, Karina Nur Syazwany, Aisha Nadhira Syuhada, Themy Sabri Tedi Kurniawan Tedi Kurniawan Tedi Kurniawan Tedi Kurniawan Tedi Kurniawan Teguh Kurniawan Teguh Kurniawan Tria Nurwina Novianti Veronica, Jessica Wafa Raihana Arwa Widyaningsih, Mia Winny Liliawati Yuni Kartika Suryana Yusrianti Sabrina Kurniadianti Yustika Desti Yolanda

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