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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
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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

Abstract

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

Abstract

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.
Research Trends in Ionic Liquids as Green and Low-Cost Solvents: Bibliometric Analysis from 2013 to 2023 Andika Purnama Shidiq; Risti Ragadhita; Meli Fiandini; Asep Bayu Dani Nandiyanto
Indonesian Journal of Limnology Vol. 4 No. 2 (2023): Indonesian Journal of Limnology
Publisher : Indonesian Society of Limnology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51264/inajl.v4i2.62

Abstract

Challenged by global awareness of environmental problems and demands of the industrial revolution, the Ionic Liquids (ILs) approach as a cheap and environmentally friendly solvent has been explored in various chemical reactions in many industrial fields. This article aims to perform bibliometric analysis of ILs by combining mapping analysis using Publish or Pheris and VOSviewer software and to pinpoint trends in scientific research. For this purpose, an exploratory study with a quantitative approach was developed based on secondary data from journals in google scholar, between 2013 and 2023. The keywords used in the data search are Ionic Liquid, low cost, and green solvent. The bibliometric indicator refers to 1,000 different relevant articles from 52 publishers with the largest number of articles produced by Elsevier, totaling 423 articles. The results showed that the peak of production occurred in 2014 and then decreased every year. The main reason for this increase is the need for cheap and environmentally friendly solvents to replace expensive and environmentally damaging conventional solvents, while the decline is due to the shift of interest into the field of applied chemistry. From the results of the Bibliometric analysis, there are 9 clusters with 126 related terms including low-cost, green solvent, application, study, and extraction. The most popular terms in 2022-2023 are related to fuel terms. This study shows the importance of bibliometric analysis in providing analytical data about what phenomena occur. This research is expected to help and become a reference for researchers in conducting and determining research themes to be taken.
Ethnoscience Study: Chemistry Aspects of the Local Practice of Mango (Mangifera Indica L.) Fruit Ripening with Carbide for Contextualized Chemistry Learning Ragadhita, Risti; Sriyati, Siti; Liliawati, Winny
Journal of Tropical Chemistry Research and Education Vol. 7 No. 1 (2025)
Publisher : Chemistry Education Department, Faculty of Tarbiyah and Education, UIN Sunan Kalijaga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/jtcre.2025.71-02

Abstract

This study aims to explore the chemistry aspects of local practices on Mango (Mangifera indica L.)fruit ripening process with calcium carbide to be integrated in contextual chemistry learning.Literature studies from scientific journals related to natural and artificial fruit ripening werecomparatively analyzed in relation to local knowledge and scientific concepts to identify potentialintegration into science learning (especially chemistry). The results showed that the integration ofnatural science with local practices, such as fruit ripening, is an innovative way to teach chemicalkinetics in a contextualized way. The study of the fruit ripening process can help students understandchemical concepts, especially chemical kinetics, in a more relevant and practical context. Thus,chemistry learning is not only limited to theory and laboratory experiments, but also includes realapplications that are relevant to the lives of students and society.
Why 200°C is Effective for Creating Carbon from Organic Waste (from Thermal Gravity (TG-DTA) Perspective)? Ragadhita, Risti; Nandiyanto, Asep Bayu Dani
ASEAN Journal for Science and Engineering in Materials Vol 2, No 2 (2023): AJSEM: Volume 2, Issue 2, September 2023
Publisher : Bumi Publikasi Nusantara

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Abstract

The purpose of this study was to evaluate the decomposition of organic waste into carbon microparticles under atmospheric conditions. Carbon microparticles are made by drying and carbonizing raw water hyacinth. Then, the carbon microparticles that have been produced are ground using a saw-milling apparatus. Carbon microparticles prepared from raw water hyacinth were heated in an electric heating furnace at a specific temperature for the analysis. The experimental results show that the thermal decomposition process has three steps. Water hyacinth is stable at temperatures below 100°C. As carbon decomposes at higher temperatures, the process of decomposition into smaller molecules occurs. Then, at temperatures ranging from 150 to 280°C, an effective carbonization process occurs to form carbon. The advantages gained, in this case, will provide a better understanding of how to use heat treatment on water hyacinth.
How to Calculate and Design Shell and Tube-type Heat Exchanger with a Single Heat Transfer Ragadhita, Risti; Nandiyanto, Asep Bayu Dani
ASEAN Journal for Science and Engineering in Materials Vol 3, No 1 (2024): AJSEM: Volume 3, Issue 1, March 2024
Publisher : Bumi Publikasi Nusantara

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

Abstract

The process in the industry requires equipment with high efficiency, especially energy. This is closely related to the need to measure the heat-transfer process in heat exchangers. A study of the effectiveness of a heat exchanger is needed to increase the effectiveness of the heat exchanger because each heat exchanger product created has different effectiveness. This study aims to discuss and explain the calculations in the design of shell and tube-type heat exchangers. A step-by-step method for calculating heat exchanger designs is presented, including reviewing simple cases regarding heat exchanger design calculations. This research has the potential to be used as standard information on how to do step-by-step calculations for heat exchanger design.
Bibliometric Data Analysis of Research on Resin-Based Brake-Pads from 2012 to 2021 using VOSviewer Mapping Analysis Computations Nandiyanto, Asep Bayu Dani; Al Husaeni, Dwi Fitria; Ragadhita, Risti
ASEAN Journal for Science and Engineering in Materials Vol 2, No 1 (2023): AJSEM: Volume 2, Issue 1, March 2023
Publisher : Bumi Publikasi Nusantara

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

Abstract

This study examines the mapping of research bibliometric data analysis related to resin-based brake pads. The research data was collected through the publish or perish reference manager application from the Google Scholar database. The title of the study material and abstract is used as a basis for searching for availability based on the specified keywords, namely "Resin-based Brake Pads". The search results show a total of 398 articles that are relevant and used in the mapping analysis. VOSviewer is used to complete the mapping process. The study period used as the study material was articles published in Google Scholar indexed journals from 2012 to 2021. We examined the number of published articles on resin-based brake pads and their relationship to problem areas using VOSviewer. The results showed that research on resin-based breake pads experienced an increase in research interest from 2017 to 2021. The smallest number of publications occurred in 2015 with 23 publications. There are main terms that are usually discussed and related to the research theme of resin-based brake pads, namely pad material, development and epoxy resin. This review is expected to serve as a starting point for conducting research by taking the field of study of resin-based brake pads.
Definition and Role of Sustainable Materials in Reaching Global Sustainable Development Goals (SDGs) Completed with Bibliometric Analysis Ragadhita, Risti; Nandiyanto, Asep Bayu Dani; Farobie, Obie; Kurniawan, Teguh; Bilad, M. Roil
ASEAN Journal for Science and Engineering in Materials Vol 5, No 1 (2026): (ONLINE FIRST) AJSEM: Volume 5, Issue 1, March 2026
Publisher : Bumi Publikasi Nusantara

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Abstract

Sustainable materials are essential in achieving the Sustainable Development Goals (SDGs), particularly in clean energy, water purification, waste reduction, and green infrastructure. This study investigates the role of material innovation in supporting the SDGs using a Systematic Literature Review (SLR) and bibliometric analysis (from Scopus database (2015–2025) using keywords “Sustainable Material,” “Green Material,” and “SDGs”). The findings showed a growing research trend, especially after the COVID-19 pandemic, with significant contributions from chemistry, engineering, and environmental sciences. Materials like nanomaterials, biomaterials, biodegradable polymers, and waste-derived products contribute to SDG 6, 7, 9, 12, and 13. Innovations such as green nanotechnology, bio-based materials, and circular material design show strong potential to address global sustainability challenges. These materials not only support emission reduction and waste valorization but also encourage green job creation and sustainable production. This study highlights interdisciplinary pathways to align material science with sustainable development.
Memberdayakan Pendidik di Era AI: Identifikasi dan Edukasi Kesadaran Guru terhadap Teknologi AI dalam Dunia Pendidikan Gandidi, Indra Mamad; Mahmudatussa'adah, Ai; Sukrawan, Yusep; Nandiyanto, Asep Bayu Dani; Fiandini, Meli; Ragadhita, Risti
Jurnal Abdimas Kartika Wijayakusuma Vol 6 No 2 (2025): Jurnal Abdimas Kartika Wijayakusuma
Publisher : LPPM Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jakw.v6i2.904

Abstract

Proyek layanan masyarakat ini bertujuan untuk meningkatkan pemahaman dan kesiapan publik terhadap integrasi Kecerdasan Buatan (AI) dalam pendidikan dengan mempromosikan literasi AI dasar di kalangan pendidik dan siswa. Program ini secara khusus berfokus pada upaya mengungkap misteri teknologi AI dan menumbuhkan kesadaran kritis tentang implikasi etis, pedagogis, dan praktisnya dalam lingkungan belajar. Metode ini melibatkan serangkaian lokakarya interaktif dan sesi pelatihan langsung yang ditujukan kepada guru, calon guru, dan siswa sekolah menengah atas. Kegiatan ini dirancang untuk memperkenalkan konsep AI mendasar, mengeksplorasi aplikasi dunia nyata, dan memberikan pengalaman terbimbing dalam menggunakan alat berbasis AI yang mudah diakses untuk tujuan pendidikan. Hasilnya menunjukkan peningkatan signifikan dalam kesadaran dan pemahaman peserta tentang AI, sebagaimana tecermin dalam survei pra dan pascaprogram. Pendidik melaporkan kepercayaan diri yang lebih besar dalam membahas topik AI di kelas dan menunjukkan peningkatan keterampilan dalam mengintegrasikan alat berbasis AI ke dalam praktik mengajar. Siswa menunjukkan peningkatan rasa ingin tahu dan pemikiran kritis tentang peran AI dalam masyarakat dan pendidikan. Sebagai kesimpulan, program ini berhasil mencapai tujuannya dengan membekali peserta dengan pengetahuan dasar dan keterampilan praktis yang terkait dengan AI sehingga mempersempit kesenjangan literasi digital di komunitas sasaran. Dampak dari inisiatif ini meluas melampaui peserta langsung karena mendorong efek berantai pemberdayaan teknologi dalam lembaga pendidikan. Hal ini juga berkontribusi pada agenda nasional untuk membina warga negara yang siap menghadapi masa depan yang mampu menavigasi dan membentuk lanskap digital yang terus berkembang dengan perspektif yang etis dan terinformasi.
Heat Exchanger Design for WO3 Synthesis using Hydrothermal Method Lianawati, Maya; Nandiyanto, Asep Bayu Dani; Kurniawan, Teguh; Ragadhita, Risti
CHEMTAG Journal of Chemical Engineering Vol 4, No 1 (2023): CHEMTAG Journal of Chemical Engineering
Publisher : Universitas 17 Agustus 1945 (UNTAG) Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56444/cjce.v4i1.3636

Abstract

This study aims to analyze a heat exchanger (HE) design in the synthesisof WO3 using hydrothermal method. The data were calculated using Microsoft Excel application using several parameters and assumption. The result found that shell and tube designed heat exchanger have 80.04% effectiveness with initial heat transfer (Q) 383197 and some specifications included. However this result further calculation for fouling factor and appropriate value for TEMA standards.
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