Article Per Year (5 Year)
p-Index From 2021 - 2026
0.817
P-Index
This Author published in this journals
All Journal MEDIA KOMUNIKASI TEKNIK SIPIL JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pengabdian Masyarakat (ABDIRA) Jurnal Penelitian Teknologi Informasi dan Sains
Roni Adi Wijaya
Universitas Negeri Jakarta
Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Languange, Linguistic, Communication & Media Nursing Social Sciences Other

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Pemanfaatan Fly Ash Limbah Pembakaran Batubara sebagai Zat Mineral Tambahan (Additive) terhadap Perbaikan Kualitas dan Kuat Tekan Semen Wijaya, Roni Adi; Astuti, Yayuk; Wijayanti, Septi
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 27, Nomor 1 (2021)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (410.244 KB) | DOI: 10.14710/mkts.v27i1.31558

Abstract

Serangkaian pengujian dilakukan untuk menentukan pengaruh penambahan fly ash limbah pembakaran batubara sebagai zat mineral tambahan (additive) terhadap perbaikan kualitas dan kuat tekan semen sesuai Standar Nasional Indonesia (SNI 15-2049-2004). Metode penelitian meliputi preparasi sampel, pembuatan semen dengan variasi fly ash 0%, 5%, 8%, 12%, dan 15%, uji sifat kimia dan fisika semen. Parameter yang diukur yaitu kadar komposisi kimia (%) menggunakan X-Ray Fluorescence Spectroscopy (XRF) ARL 9800 OASIS, kadar freelime (%) secara volumetri, kadar Insoluble Residue (%) secara gravimetri, kuat tekan (kg/cm2), dan kehalusan semen (cm2/g). Hasil penelitian menunjukkan bahwa penambahan fly ash meningkatkan kandungan SiO2 semen, sehingga memperbanyak senyawa C3S dan C2S yang merupakan komponen kuat tekan semen. Selain itu, penambahan fly ash berbanding lurus dengan kadar IR, kuat tekan, kehalusan, dan berbanding terbalik dengan kadar freelime. Sehingga penambahan fly ash dapat memperbaiki kualitas semen dengan menaikan komponen kimia, menaikan kuat tekan, dan mengurangi keretakan atau ekspansi semen.
Synthesis, Characterization of Ag2s from AgCl Waste of Argentometry Titration with Heating Temperature Variations and Its Application as a Temperature Sensor Based on Negative Temperature Coefficient (NTC) Gunawan Gunawan; Sarahtrinita Glikeria Like Megawati; Nor Basid Adiwibawa Prasetya; Roni Adi Wijaya
Jurnal Kimia Sains dan Aplikasi Vol 25, No 8 (2022): Volume 25 Issue 8 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.25.8.292-299

Abstract

Synthesis of Ag2S from AgCl waste of argentometric titration with heating temperature variations as a temperature sensor has been done. This study aims to synthesize Ag2S and examine the effect of heating temperature on crystal quality and electrical characteristics as a temperature sensor based on the Negative Temperature Coefficient (NTC). Ag2S synthesis was carried out by precipitation in a water bath with various heating temperatures of 40°C, 60°C, and 80°C. The success of the synthesis was confirmed by X-Ray Diffraction (XRD) with a typical peak of 2θ from Ag2S standard at 29.07°, 31.60°, 36.97°, 37.81°, and the highest crystallinity was obtained at a heating temperature of 60°C. Meanwhile, UV-Vis Diffuse Reflectance Spectroscopy (DRS UV-Vis) showed a band gap corresponding to Ag2S (0.9-1.05 eV). Furthermore, the Ag2S powder was made into pellets and applied as a temperature sensor. Then the resistance value and the electrical characteristics of the resulting sensor were measured. The best resistance was obtained from Ag2S synthesized at a temperature of 60°C with constant (B) and sensitivity (α) values of 2974 K and −3.35%, respectively. This indicated that Ag2S had been successfully synthesized, and the best sensor quality was obtained from Ag2S heated at a temperature of 60°C.
Penguatan Literasi Energi Terbarukan Model Sel Bahan Bakar Hidrogen bagi Guru MGMP Kimia DKI Jakarta Afrizal Afrizal; Hayyun Lisdiana; Roni Adi Wijaya; Fitri Ramadhani; Siti Azizah; Laurensia Laurensia; Imam Hanafi
Jurnal Pengabdian Masyarakat (ABDIRA) Vol 6, No 2 (2026): Abdira, April
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/abdira.v6i2.1801

Abstract

This community service program aims to enhance renewable energy literacy and improve the skills of chemistry teachers at Madrasah Aliyah (MA) in DKI Jakarta in developing a hydrogen fuel cell model based on polymer electrolyte membrane (PEMFC) technology. The training was conducted in three stages: preliminary, implementation, and evaluation. The initial stage involved a needs analysis and data collection on teachers’ understanding of fuel cell technology. The implementation stage consisted of lectures, discussions, simulations, assignments, and direct observation of participants’ practical skills in designing the fuel cell model. The evaluation stage assessed the training materials, instructors, and participants to determine the program’s effectiveness. The results showed a significant improvement in teachers’ conceptual understanding and practical competence in integrating hydrogen fuel cell technology into chemistry learning. This program is expected to foster innovative teachers capable of utilising renewable energy technology in classroom practice and improving the quality of students’ academic assessment.
Penerapan Mini Cooler Berbasis Minyak Kelapa dan Beeswax Sebagai Media Pembelajaran untuk Penguatan Literasi Sains Siswa SMA Neng Tresna Umi Culsum; Rinda Mulmeyda; Citra Santikasari; Roni Adi Wijaya; Ika Keumala Fitri; Key Yodiananda Divia; Nadine Davina Nawing; Cut Gianna Naifa Dharmawan; Ni Putu Ryane Pinajeng; Meta Arishanti
Jurnal Penelitian Teknologi Informasi dan Sains Vol. 4 No. 1 (2026): : JURNAL PENELITIAN TEKNOLOGI INFORMASI DAN SAINS (JPTIS)
Publisher : Institut Teknologi dan Bisnis (ITB) Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54066/jptis.v4i1.5057

Abstract

Scientific literacy among high school students needs to be strengthened through contextual and experiential learning that connects scientific concepts with their applications in everyday life. This community service program aimed to support teachers in developing experiment-based learning activities to enhance students’ scientific literacy through the utilization of coconut oil and beeswax as thermal energy storage materials. The activities consisted of scientific material delivery, experiments involving coconut oil and beeswax, assembly of a simple mini cooler prototype, and observation and temperature measurement. The results showed that participants' understanding of phase change and energy concepts improved, with an average post-test score of 98.75; furthermore, participants successfully produced a mini cooler prototype based on coconut oil and beeswax. The prototype can be utilized as a learning medium to introduce phase changes, heat transfer, and thermal energy storage concepts. The activity also provided teachers with an applicable approach to designing experimental learning that encourages students to observe phenomena, interpret experimental data, and apply scientific concepts to real-life situations. This program demonstrates the potential of locally available materials and simple experimental technology to support the development of innovative science learning and strengthen scientific literacy among high school students.
Co-Authors Afrizal Afrizal Citra Santikasari Cut Gianna Naifa Dharmawan Fitri Ramadhani Gunawan Gunawan Hayyun Lisdiana Ika Keumala Fitri Imam Hanafi Key Yodiananda Divia Laurensia Laurensia Meta Arishanti Nadine Davina Nawing Neng Tresna Umi Culsum Ni Putu Ryane Pinajeng Nor Basid Adiwibawa Prasetya Rinda Mulmeyda Sarahtrinita Glikeria Like Megawati Siti Azizah Wijayanti, Septi Yayuk Astuti