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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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The Drilling Method Application Using Abacus to Arithmetic Operations Skills in Student with Hearing Impairment at Special School Endang Rusyani; Een Ratnengsih; Andri Syah Putra; Rina Maryanti; Dwi Fitria Al Husaeni; Risti Ragadhita
Indonesian Journal of Community and Special Needs Education Vol 2, No 1 (2022): IJCSNE: March 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

The purpose of this study was to determine the effect of the drilling method application using abacus in improving arithmetic subtraction operations skills in deaf children. This study used an experimental method with Single Subject Research (SSR), A-B-A design. The drilling method was used in the learning process. In addition, the abacus media was also used in the subtraction arithmetic operation material in learning mathematics. The results showed that there was an effect of applying the drilling method using abacus in improving the arithmetic subtraction operation skills in deaf children with the initials SS. This could be seen from the increase in the mean level of student’s abilities starting from baseline-1 (A1) by 30%, intervention (B) by 65%, and baseline-2 (A2) by 86.66%. The methods and media were suitable to make the lesson easier to understand for students. The drilling method with the abacus media could be used as an alternative for teachers in improving the skills of arithmetic subtraction operations in deaf children. The results of this study are expected to contribute to developing special education related to the application of the drilling method using abacus media to improve arithmetic operations skills in learning next math.

The Application of Speaking Development on the Establishment of Object Vocabulary in Student with Hearing Impairment Endang Rusyani; Fauzia Nur Awaliah; Rina Maryanti; Dwi Fitria Al Husaeni; Risti Ragadhita; Budi Susetyo
Indonesian Journal of Educational Research and Technology Vol 2, No 1 (2022): IJERT: March 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

This study aims to determine the increase in the results of the application of speech development to the formation of object vocabulary in deaf children. The approach used is a quantitative approach with the Single Subject Research (SSR) experimental method in the A-B-A design. The A-B-A design used has three phases: 1) Before the intervention/treatment is given, 2) when the treatment/intervention is given in the form of speech development (B), 3) after the treatment is given (A2). The results of the study showed the mean level of the baseline-1 phase (A-1) 43.43%, the intervention phase 47.07%, and the baseline-2 phase (A-2) 51.48%. Then, in the intervention phase (B) to baseline-1 (A-1), there was a 50% overlap, while in the intervention (B) to baseline-2 (A-2) there was no 0% overlap. Each session experienced an increase, although not significantly. The influence of the intervention on the formation of the object vocabulary of deaf children can still be said to be quite increasing because it has increased both before being treated and after being given treatment. Thus it can be concluded that the application of speech development is sufficient to increase the formation of object vocabulary in deaf children. The application of speech development is very important for deaf children so that deaf children are able to function their speech organs well and so that deaf children are able to communicate with other people, both the implementation of speech development is carried out in class or providing additional classes outside of class hours.

Computation in the Analysis of Techno-Economic of the Production of Al2O3 (Aluminum Oxide) Nanoparticles through Precipitation Method Yusrianti Sabrina Kurniadianti; Adzra Zahra Ziva; Yuni Kartika Suryana; Risti Ragadhita; Asep Bayu Dani Nandiyanto; Tedi Kurniawan
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol 2 No 1 (2021): International Journal of Informatics, Information System and Computer Engineering
Publisher : Universitas Komputer Indonesia

This study aims to demonstrate computation in the techno-economic analysis of the production of aluminum oxide (Al2O3) using the precipitation method on an industrial scale. This evaluation is based on the perspective of technical and economic evaluation. Several economic evaluation parameters were analyzed to obtain potential information from the manufacture of Al2O3 nanoparticles based on gross profit margin, payback period, and cumulative net present value. The results of this study identified that the manufacture of Al2O3 nanoparticles using the precipitation method could be done industrially. Based on the engineering perspective, Al2O3 nanoparticles can be produced as much as 6.9 tons and earn an annual profit of 144,635.69 USD with a period of 20 years. To ensure that this project can be carried out, an economic evaluation is made based on estimates of ideal and non-ideal conditions, including tax increases, sales changes, raw material prices, utility prices, and laborâ€™s salary. This study is expected to provide information for the manufacture of Al2O3 nanoparticles using the precipitation method on an industrial scale.

Computation Application: Techno-Economic Analysis on the Production of Magnesium Oxide Nanoparticles by Precipitation Method Lidia Intan Febriani; Citra Nurhashiva; Jessica Veronica; Risti Ragadhita; Asep Bayu Dani Nandiyanto; Tedi Kurniawan
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol 1 No 1 (2020): International Journal of Informatics, Information System and Computer Engineering
Publisher : Universitas Komputer Indonesia

This study aims to analyze the feasibility of a project for the production of magnesium oxide nanoparticles using precipitation methods on a large scale. The feasibility analysis of this project was determined using an evaluation from an economic and engineering perspective. Evaluation from an engineering perspective is determined by the evaluation of the initial factory design and stoichiometric calculations. Meanwhile, the evaluation from an economic perspective is determined by several parameters, such as Payback Period, Gross Profit Margin, Cumulative Net Present Value, etc. The analysis results show that the production of magnesium oxide nanoparticles using the precipitation method can be carried out on an industrial scale. In this project, 11,250 kg of magnesium oxide nanoparticles were obtained per day, and the total profit earned was 1,881,184,752.91 USD in 10 years. Payback Period analysis shows that the investment will be profitable after more than three years. To ensure project feasibility, projects are estimated from ideal to worst-case conditions in production, including salary, sales, raw materials, utilities, and external conditions such as taxes.

Techno-economic Analysis on the Production of Zinc Sulfide Nanoparticles by Precipitation Assisted Ultrasonic Radiation Method L Astuti; R P Dewi; A Nurdiana; R Ragadhita; A B D Nandiyanto
International Journal of Research and Applied Technology (INJURATECH) Vol 1 No 1 (2021): International Journal of Research and Applied Technology (INJURATECH) 2021
Publisher : Universitas Komputer Indonesia

Zinc sulfide is a material that has many uses in various fields. Zinc sulfide is deriving from the mineral sphalerite. The purpose of this study was to evaluate the feasibility of producing zinc sulfide from zinc acetate and sodium sulfide using the precipitation-assisted ultrasonic radiation method. This method is the most efficient method for the synthesis of zinc sulfide nanoparticles, because it does not take much time and the resulting product is high. The evaluation was done from the engineering and economic perspectives. The feasibility analysis method from the engineering perspective was done by designing the initial production design on a large scale, whereas the analysis from an economic perspective was done by calculating various economic parameters, that is Gross Profit Margin, Cumulative Net Present Value, Internal Rate Return, Payback Period, Break Event Point, and Profitability Index. The engineering perspective showed that the production of zinc sulfide nanoparticles can be done on a large scale due to the commercial availability of materials and tools. Based on the economic evaluation, the production of zinc sulfide nanoparticles by precipitation-assisted ultrasonic method is ideal for an industrial scale. Earned increased profits over 20 years, the payback on investment costs lasted only two years. We hope that this study can provide references to readers, industry, and researchers regarding the feasibility analysis of the production of zinc sulfide nanoparticles using the precipitation-assisted ultrasonic radiation method.

Review: Manufacturing Of Magnesium Oxide Nanoparticles As Antibacterial Agents Asep Nandiyanto; Risti Ragadhita; Citra Nurhashiva; Tedi Kurniawan
Science Midwifery Vol 10 No 1, October (2021): Science Midwifery
Publisher : Institute of Computer Science (IOCS)

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

The purpose of this article is to determine the most efficient synthesis method of magnesium oxide nanoparticles as an antimicrobial. The magnesium oxide synthesis method discussed in this study is complemented by the results of the study of the material sources, methods, advantages, and disadvantages of each method so that it can be a reference for choosing which method is more efficient in the synthesis of magnesium oxide. synthesis of magnesium oxide such as (1) synthesis of plant extracts,(2)) combustion, (3) sonochemical synthesis, (4) sol-gel synthesis, and (5) solid-state taken from the journal 2017-2020. This synthesis method resulted in the characterization of magnesium oxide nanoparticles which were analyzed using X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), Field Emission Scanning Electron Microscopy (FESEM). The results showed that there were advantages and disadvantages of each method of synthesis of magnesium oxide used. The most efficient method for synthesizing magnesium oxide as an antimicrobial is the sol-gel synthesis method. The sol-gel method uses readily available materials, has a relatively low cost, easy procedure to perform, and was found to be a light and efficient route for large-scale industrial production of fine magnesium oxide nanoparticles as antimicrobials.

Techno-Economic Analysis of Lanthanum Oxide Nanoparticles Production using Combustion Solution and Hydrothermal Supercritical Water Condition Asep Bayu Nandiyanto; Irine Sofianty; Rofi Fadilah Madani; Adani Ghina Puspita Sari; Fitri Febriyanti; Risti Ragadhita; Rina Maryanti; Eddy Soeryanto Soegoto
Jurnal Teknik Industri Vol. 23 No. 2 (2022): August
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/JTIUMM.Vol23.No2.79-92

Lanthanum oxide (La2O3) nanoparticles are widely applied in various fields and have the potential to be made on a fabrication scope. As a consequence, feasibility studies for generating industries for La2O3 production are required, particularly in developing countries. The purpose of this research was to evaluate and investigate the prospect of the production of La2O3 nanoparticles. This study was carried out to determine whether large-scale La2O3 production using solution combustion (SC) and hydrothermal supercritical water conditions (HSWC) is profitable or not. The analysis method was evaluated based on economic evaluation parameters such as gross profit margin, payback period, and cumulative net present value, while also taking technical aspects into account by designing commercial tools. An economic evaluation was made based on estimates of ideal conditions, such as tax increases, changes in raw materials, sales, workers' salaries, and utility costs. The results of the analysis show that the best method, and has great advantages, was the HSWC method. Based on an engineering perspective, this method produces 4.08 tons of La2O3 in 20 years of production. This study is expected to provide information on the production of La2O3 nanoparticles by comparing the solution combustion method and hydrothermal supercritical water conditions on an industrial scale.

RANCANGAN HEAT EXCHANGER JENIS SHELL AND TUBE UNTUK PRODUKSI NANOPARTIKEL Fe3O4 SKALA INDUSTRI: DESIGN OF SHELL AND TUBE TYPE HEAT EXCHANGER FOR INDUSTRIAL SCALE Fe3O4 NANOPARTICLE PRODUCTION USING MATHEMATIC MODELING Mentari Putri Aprilia; Asep Bayu Dani Nandiyanto; Teguh Kurniawan; Meli Fiandini; Risti Ragadhita
Fraction: Jurnal Teori dan Terapan Matematika Vol. 2 No. 2 (2022): Fraction: Jurnal Teori dan Terapan Matematika
Publisher : Jurusan Matematika, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/fraction.v2i2.33

Nanopartikel Fe3O4 merupakan jenis nanopartikel yang berperan penting dalam kehidupan industri. Namun, masih jarang ditemukan proses sintesis Fe3O4 menggunakan sistem heat exchanger pada skala industri sehingga penelitian ini dilakukan untuk merancang heat exchanger jenis shell and tube dalam proses produksi nanopartikel Fe3O4 pada skala industri. Metode yang digunakan pada penelitian ini yaitu perhitungan matematis menggunakan lebih dari 20 persamaan yang diturunkan berdasarkan pengaruh dimensi dan spesifikasi fluida dan kemudian data yang diperoleh diolah dengan menggunakan aplikasi Microsoft Excel. Rancangan alat HE memiliki spesifikasi panjang tube 4,572 m, diameter tube 0,0254 m, dan ketebalannya 0,0018 m. Lalu data diolah menggunakan software pengolah data Microsoft Excel. Hasilnya menunjukkan bahwa rancagan heat exchanger jenis shell and tube ini memiliki nilai efektivitas 93% dengan faktor kemurnian 0,01 jam.ft2.oF/Btu. Dari penelitian ini diketahui jenis HE shell and tube yang dirancang belum sesuai dengan standar yang telah ditetapkan oleh industri.

Interpretation of Fourier Transform Infrared Spectra (FTIR): A Practical Approach in the Polymer/Plastic Thermal Decomposition Asep Bayu Dani Nandiyanto; Risti Ragadhita; Meli Fiandini
Indonesian Journal of Science and Technology Vol 8, No 1 (2023): IJOST: April 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i1.53297

Fourier transform infrared (FTIR) is one of the tools to represent molecular structure based on atomic vibration. It can denote a specific property of the chemical bond and molecular structure in the material, especially when analyzing specimens relating to plastics, polymers, and organic components. The FTIR peaks and spectrum act as a fingerprint of a specific molecular structure and chemical bonding, which need a sufficient reference database to distinguish them. This paper is to address issues of the need for a reference database of FTIR. This paper exhibits step-by-step information on how to read and interpret the FTIR spectra and identify a molecule's backbone with its functional groups. Practical examples from the analysis of several plastics/polymers and the thermally decomposing plastics/polymers were included to help and guide the reader to comprehend the basic concept of FTIR spectra.

How to Calculate Crystallite Size from X-Ray Diffraction (XRD) using Scherrer Method Siti Fatimah; Risti Ragadhita; Dwi Fitria Al Husaeni; Asep Bayu Dani Nandiyanto
ASEAN Journal of Science and Engineering Vol 2, No 1 (2022): AJSE: March 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

X-Ray Diffraction (XRD) has been developed to analyze a crystal structure in the material. XRD is then improved for determining and identifying the presence of a compound, crystallinity, and crystal properties. XRD works by observing the ray refraction pattern as a result of the beam being refracted by a material that has an atomic arrangement in its crystal lattice. Until now, there is less information regarding detailed information on how to read the XRD spectrum and peak. This study aims to demonstrate how to calculate and interpret the crystallite size based on the XRD spectra. The step-by-step method in the calculation based on the XRD data is presented, which can help especially students and first-time users in understanding XRD results. This study is prospective to be used as standard information on how to read and interpret XRD spectra.

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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