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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

Published : 52 Documents Claim Missing Document

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Articles

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How to Read and Interpret FTIR Spectroscope of Organic Material Nandiyanto, Asep Bayu Dani; Oktiani, Rosi; Ragadhita, Risti
Indonesian Journal of Science and Technology Vol 4, No 1 (2019): IJOST: VOLUME 4, ISSUE 1, 2019
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v4i1.15806

Fourier Transform Infrared (FTIR) has been developed as a tool for the simultaneous and quantitative determination of organic components, including chemical bond, as well as organic content (e.g. protein, carbohydrate and lipid). However, until now, there is no further information for the detailed information in the FTIR peaks. The objective of this study was to demonstrate how to read and assess chemical bond and structure in the organic material. The analysis was then compared with the literatures. The step-by-step method on how to read the FTIR data was presented, including reviewing simple to the complex organic materials. This study is potential to be used as a standard information on how to read FTIR peaks in the biochemical and organic materials.

IMPROVED MATHEMATICS UNDERSTANDING OF TIME, DISTANCE AND SPEED USING TAMIYA GAME TOWARDS STUDENT WITH HEARING IMPAIRMENT Rusyani, Endang; Sutisna, Nia; Hernawati, Ati; Maryanti, Rina; Husaeni, Dwi Fitria Al; Ragadhita, Risti
Jurnal Pengajaran MIPA Vol 26, No 2 (2021): JPMIPA: Volume 26, Issue 2, 2021
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v26i2.37201

This study aimed to determine the effect of using Tamiya's game in improving the mathematical understanding of students with hearing impairment on time, distance and speed. The method used was Classroom Action Research using Tamiya games as learning media. The research was conducted in two cycles using the Kemmis and Taggart model which consists of 4 components, namely planning, action, observation and reflection. From the research conducted, it was found that in cycle I, there was a slight increase in learning outcomes where 25% of students passed and 75% did not graduate from the initial conditions, 100% of students passed the class with an average score of 53.75. In cycle II there was a significant change, 100% of students passed after making learning improvements from cycle I, an active learning situation emerged and an increase in learning outcomes. These results were obtained due to an increase in the involvement of teachers and students in learning. The use of Tamiya games as a concrete learning medium by involving students in direct experience could help the limitations of deaf children in receiving information and abstraction power that cause obstacles to knowledge achievement. The impact of this study shows that the use of the Tamiya game as a concrete learning medium could improve the mathematical understanding of the topic of time, distance and speed towards fifth grade students with hearing impairment.

The Effect of the Team-Games-Tournament Method on Improving the Learning Ability of Student with Hearing Impairment in Multiplication Concepts Rusyani, Endang; Saepulloh, Anwar; Maryanti, Rina; Ragadhita, Risti; Al Husaeni, Dwi Fitria
Indonesian Journal of Multidiciplinary Research Vol 1, No 2 (2021): IJOMR: VOLUME 1, ISSUE 2, 2021
Publisher : Universitas Pendidikan Indonesia (UPI)

This study aimed to evaluate and analyse the results of mathematics learning about the concept of multiplication in students with hearing impairment. In this study, the team-games-tournament (TGT) method was used to teach the concept of multiplication to seven students with hearing impairment in an elementary school at the Special School in Cimahi through four stages of learning, namely: 1) pretest presentation, 2) learning presentation with the TGT method, and 3) posttest presentation. The results of the study showed that there was a significant increase in the ability to learn multiplication concepts using the TGT method. Therefore, the TGT method could be a suitable choice of learning method used in learning the multiplication concept for students with hearing impairment because, through the TGT method, students collaborate and teach each other in-game activities, that make the students understand the concept of multiplication easier, thus improve students' ability to learn the concept of multiplication. This research is important because it provides information about the use of new and unique media or learning methods that can be used to improve students' abilities, especially students with hearing impairments in the mathematics learning process.

Computational Bibliometric Analysis on Publication of Techno-Economic Education Ragadhita, Risti; Nandiyanto, Asep Bayu Dani
Indonesian Journal of Multidiciplinary Research Vol 2, No 1 (2022): IJOMR: VOLUME 2, ISSUE 1, 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

Techno-economics involves the systematic evaluation of economic aspects to provide solutions to technical problems encountered. The study of techno-economic analysis can provide a basis for decision-making related to economic factors. This study was to analyze the scope of research on techno-economic education using bibliometric evaluation and data mapping approach (i.e., VOSviewer software). Material research data was gathered from application reference manager databases. The study material titles, keywords, and abstracts are used to guide the search process. In the period 2017-2022, the analysis was conducted using the number of publications collected, which totaled 288 related papers. Based on the number of publications related to techno-economic educations, the total publications from 2017-2022 are unstable. However, in 2021 publications related to techno-economic education have increased. This study highlights the value of bibliometric analysis in providing information on how phenomena occur. This study is meant to assist and serve as a reference for researchers undertaking and deciding on research topics.

Resin-based Brake Pad from Rice Husk Particles: From Literature Review of Brake Pad from Agricultural Waste to the Techno-Economic Analysis Asep Bayu Dani Nandiyanto; Dwi Fitria Al Husaeni; Risti Ragadhita; Tedi Kurniawan
Automotive Experiences Vol 4 No 3 (2021)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

A brake pad is the most crucial component in motorized vehicles. Many ways have been done and reported on how to prepare resin-based brake pads, but information relating to the economic analysis of resin-based brake pads on a large-scale production is still rare. This study aimed to report a literature review of brake pad production from biomass and agricultural wastes, optimal design of brake pad, and techno-economic analysis of resin-based brake pad production from rice husk. In the techno-economic analysis, we focused on engineering and economic perspectives. Engineering analysis was conducted by calculating the mass balance in the resin-brake pad production process. To support the analysis, economic parameters including gross profit margin (GPM), payback period (PBP), break-even point (BEP), cumulative net present value (CNPV), profitability index (PI), internal rate return (IRR), and return on investment (ROI) were calculated to predict the feasibility of project under ideal condition. We also calculated the techno-economic analysis for the worst cases in the project, calculating the internal problems (i.e., raw materials, sales, utility, labor, employee, fixed cost, variable cost, and production capacity) and the external issues (i.e., taxes and subsidiaries). Based on the engineering evaluation, the resin-based brake pad project is prospective. From economic evaluation, GPM, PBP, BEP, CNPV, PI, and ROI showed positive results, indicating that the project is potential for the large-scale production. This work has demonstrated the importance of the projects for further development and can be used as a reference for further production of brake pads made from agricultural waste.

Synthesis of Carbon Microparticles from Red Dragon Fruit (Hylocereus undatus) Peel Waste and Their Adsorption Isotherm Characteristics Asep Bayu Dani Nandiyanto; Rina Maryanti; Meli Fiandini; Risti Ragadhita; Dian Usdiyana; Sri Anggraeni; Wafa Raihana Arwa; Abdulkareem Sh. Mahdi Al-Obaidi
Molekul Vol 15, No 3 (2020)
Publisher : Universitas Jenderal Soedirman

This study aims to demonstrate the preparation of carbon microparticles obtained from red dragon fruit peel waste and their adsorption isotherm characteristics. The carbon microparticles were prepared by combining carbonization (at 250°C) and saw-milling process, and to get carbon microparticles with a specific size, sieve analysis was used. The adsorption isotherm was done by testing the adsorption ability of carbon microparticles with a specific size into curcumin solution in the batch-type reactor. The adsorption results were then compared to several standard isotherm models (i.e., Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models) for understanding what phenomena happen during the adsorption process. The adsorption analysis was also confirmed by testing several sizes of the carbon microparticles to predict the proposal mechanism in the adsorption process. The analysis results showed that the multilayer adsorption process occurs for all sizes in the micrometer range, and the process involves physical interactions between adsorbate and surface of adsorbent. The existence of multilayers is due to the possibility in the existence of porous structure in the carbon microparticles. This study is important for giving an alternative solution for reusable organic waste as well as supporting the fundamental researches in the further applications of carbon particles as catalyst and adsorbent.

Literature Review: Fabrication Method, Characterization, Performance, and Application of Cassava Peel as Bio-Coagulant for Wastewater Treatment Yustika Desti Yolanda; Mia Widyaningsih; Risti Ragadhita; Asep Bayu Dani Nandiyanto
Jurnal Kartika Kimia Vol 5 No 1 (2022): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v5i1.93

The purpose of this study was to conduct a literature review to determine the understanding of current research on the use of Cassava Peel (CP) in the field of wastewater treatment, especially as a coagulant. This study reports on the types of coagulant modification of CP, coagulants characterization of CP for each modification, coagulants performance of CP under various conditions, and various applications of CP coagulant for wastewater treatment. This literature study takes references from 51 articles from the period 2011-2022. We mapped each article used and visualized it using the VOS viewer to find out the relationship between topics and absorption capacity in terms of article titles and keywords. From the results of a literature review study, CP is an attractive option and has the potential to be used as a natural coagulant or adsorbent to remove pollutants (such as dyes and turbidity) in wastewater treatment. The results of this study are expected to provide benefits and ideas for utilizing agricultural waste such as CP to become an economically efficient material. Keywords: Adsorbent, Agricultural waste, Cassava peel, Economical coagulant, VOS viewer, Water treatment.

The Application of The Word "Lembaga" Method In Improving The Articulation Ability of Hearing Impairment in Second Grade of Elementary Special School Sumbersari Endang Rusyani; Fika Annisa Sabrina; Risti Ragadhita
Indonesian Journal of Community and Special Needs Education Vol 2, No 2 (2022): IJCSNE: September 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

The purpose of this study was to determine the effect of the application of the word method for the "LEMBAGA" word on improving the articulation ability to hear impairment students in the second grade of elementary special school. This study uses the Single Subject Research (SSR) method with an A-B-A design on one elementary special school student with a hearing impairment student. The learning method begins with the introduction of a particular word. This word is then broken down into syllables, syllables into letters. Next, letters are the process of arranging letters into syllables and syllables into words. The results showed that there was an increase in the child's articulation ability before and after the intervention was given. The application of the word "Lembaga" method is used by showing children how to write a word and a picture of the word, thus children are more interested in participating in learning.

Resin Matrix Composition on the Performance of Brake Pads Made from Durian Seeds: From Computational Bibliometric Literature Analysis to Experiment Asep Bayu Dani Nandiyanto; Dwi Novia Al Husaeni; Risti Ragadhita; Meli Fiandini; Dwi Fitria Al Husaeni; Muhammad Aziz
Automotive Experiences Vol 5 No 3 (2022)
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.6852

The purpose of this study was to analyze the effect of a resin composition on the performance of brake pads with durian seeds (BDs) as the base material. Experiments were done by attaching saw-milled BD particles to a polymer matrix. Various resin compositions were used for preparing the brake pad, which was then tested (press test, puncture test, and friction test). Physical properties (i.e., particle size, surface roughness, morphology, and density), as well as mechanical properties (ie: hardness, wear rate, and friction coefficient properties), were investigated. Based on observations, the best mechanical properties were found in the highest resin mixture, reaching a compressive strength value of 2.4 MPa. The impact of the homogeneity of the brake pad filler particles is the main reason. The high resin composition causes more cross-links to be formed. This research demonstrates the prospective environmentally friendly and inexpensive brake pads used to replace current products that use hazardous materials.

Application of Scrabble Game in Improving Learning of Simple Sentence Structure on the Student with Hearing Impairment Endang Rusyani; Rina Maryanti; Sri Rahayu; Risti Ragadhita; Dwi Fitria Al Husaeni; Budi Susetyo
ASEAN Journal of Science and Engineering Education Vol 2, No 1 (2022): AJSEE: March 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

The purpose of this study was to analyze the application of scramble games on the learning ability to compile simple sentence structures in students with hearing impairment. Scramble Game is the learning method that was chosen to convey the material for constructing simple sentences in this study. The research method used in this study was an experimental method with a Single Subject Research (SSR) design which was conducted in three stages, namely: 1) learning in initial condition (before intervention), 2) learning in the intervention condition, and 3) learning after the intervention. The research subject is a second-grade student with hearing impairment at a special junior high school in Cirebon Regency. The Scramble Game method is prepared by making picture cards containing simple words to be arranged into coherent sentences. The results of the study show that after being given learning with the scramble game with picture word cards, the student with hearing impairment experienced increases in their ability to compose simple sentence structures. This study provides alternative learning strategies, especially for teachers who teach the student with hearing impairment.

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 Bayu Dani Nandiyanto, Asep 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, Rosi 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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