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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) Mechanical Engineering for Society and Industry 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 Sasambo: Jurnal Abdimas (Journal of Community Service) 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.

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 Engineeri
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.

Domestic waste (eggshells and banana peels particles) as sustainable and renewable resources for improving resin-based brakepad performance: Bibliometric literature review, techno-economic analysis, dual-sized reinforcing experiments, to comparison ... Nandiyanto, Asep Bayu Dani; Ragadhita, Risti; Fiandini, Meli; Al Husaeni, Dwi Fitria; Al Husaeni, Dwi Novia; Fadhillah, Farid
Communications in Science and Technology Vol 7 No 1 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.1.2022.757

The objective of this study is to develop a new environmentally-friendly brake pad made from eggshells (Es) and banana peels (BPs) as reinforcement agents. E and BP particles as dual reinforcement with various compositions were combined. The E/BP mixture was then embedded on a polymer matrix composing a resin/hardener mixture in a 1:1 ratio. As a standard, brake pads using a single reinforcement of E and BP particles were also fabricated. Physical properties (i.e. particle size, surface roughness, morphology, and density), as well as mechanical properties (i.e. hardness, wear rate, and friction coefficient properties) were investigated. It was observed that using dual reinforcements was preferable (compared to using single reinforcements) because they had a synergistic effect on the mechanical properties of the brake pad. The best mechanical properties were found in dual reinforcements of brake pad specimens using E/BP particles with a higher BP ratio in which the value of the stiffness test, puncture test, wear rate, and coefficient of friction were 4.5 MPa, 86.80, 0.093×10-4 g/s.mm2, and 1.67×10-4, respectively. A high BP particle ratio played a dominant role in dual reinforcements, increasing the resin's bonding ability and resulting in good adhesion between the reinforcement and matrix. When compared to commercial brake pads, the brake pad specimens fabricated in this study met the standards. The techno-economic analysis also confirmed the prospective production of brake pads from E and BP particles (compared to commercial brake pads). From this research, it is expected that environmentally friendly and low-cost brake pads can be used to replace the dangerous friction materials.

Design of reactor for the production of zinc oxide nanoparticles Noorlela, Anisa; Nandiyanto, Asep Bayu Dani; Ragadhita, Risti; Kurniawan, Teguh
Acta Chimica Asiana Vol. 6 No. 1 (2023)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v6i1.146

This study aims to design a continuous stirred tank reactor (CSTR) type reactor to produce zinc oxide (ZnO) nanoparticles. Mass balance calculations were carried out in this study as a benchmark to determine whether the reactor was working properly by knowing the flow of incoming raw materials and the products produced by the reactor. Furthermore, the reactor's design and the stirrer used in the reactor are calculated manually using Microsoft Excel. Based on the calculation results of the reactor design, the reactor volume is 8224.359 liters, with a vessel diameter of 73.298 in, a cylinder height of 166.090 in, and a cylinder thickness of 73.444 in. The top cover of the reactor measures 12.387 inches with a thickness of 0.072 inches, while the bottom cover measures 21.185 inches with a thickness of 0.083 inches, so the overall height of the reactor is 37.552 in. The reactor is equipped with one stirrer with an impeller diameter of 36.722 in, impeller height from the bottom of the tank is 24.433 in, impeller width is 7.344 in, and impeller length is 9.180 in. Turbulent stirring flow conditions with a standard motor power for the stirrer is 6.849 HP. This design will be a reference for building more economical, efficient, and highly demanding reactors.

Co-Authors A Nurdiana Abdulkareem Sh. Mahdi Al Obaidi Abdulkareem Sh. Mahdi Al-Obaidi Abdulkareem Sh. Mahdi Al-Obaidi Abidin, Muhamad Adani Ghina Puspita Sari Adzra Zahra Ziva Agus Kamaludin, Agus Agus Solehudin Agus Solehudin Ahmad Aminudin Aini, Rifti Nurul Al Husaeni, Dwi Fitria Al Husaeni, Dwi Novia Al-Obaidi, Abdulkareem Sh. Mahdi Anasdzaky, Fawwaz Rizqi 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 Budi Susetyo Chen, Fatimah Chen 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 Faturohman, Andika Haikal Fauzi, Fajar Miraz Fauzia Nur Awaliah Fiandini, Meli Fika Annisa Sabrina Fitri Febriyanti Fitri, Siti Hikmatul Hafidh, Ashary Fathul Haipan Salam 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 Mahmudatuss’adah, Ai Maya Lianawati Meli Fiandini Mentari Putri Aprilia Mia Widyaningsih Muhammad Aziz Muhammad Aziz Muhammad Irfansyah Maulana Muhammad Roil Bilad Muji Setiyo Nia Sutisna, Nia Noorlela, Anisa Nurhashiva, Citra Nyoman Ayu Kristinawati Obie Farobie R P Dewi Ratnengsih, Een Rina Maryanti Rizky, Karina Mulya Rofi Fadilah Madani Rosi Oktiani Rusyani, Endang Saepulloh, Anwar SAKINAH, PUTRI Salam, Haipan Salsabila, Annisa Rizky Santiuly Girsang, Gabriela Chelvina Sidik, Adi Permana Sifa Aulia Rahma Siti Sriyati Sri Anggraeni Sri Rahayu Sukrawan, Yusep 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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