Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Multidisciplinary Indonesian Center Journal
Yohanes Engge
Universitas Katolik Weetebula
Religion Humanities Earth & Planetary Sciences Education Engineering Public Health Other

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Scientific Literacy Assistance for Children in Lombu Village, Southwest Sumba Regency Yulita Adelfin Lede; Yohanis U. Kaleka; Yohanes Engge
JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Vol 7 No 1 (2023): Jati Emas (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat)
Publisher : Dewan Pimpinan Daerah (DPD) Perkumpulan Dosen Indonesia Semesta (DIS) Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36339/je.v7i1.726

Abstract

Science literacy is included in one of the science skills that children should possess and is part of the national literacy movement to increase low literacy among children. Especially on the island of Sumba, it is known that the scientific literacy of children has not increased significantly. Scientific literacy assistance activities have been carried out in Lombu Village, Wewewa Tengah District, Southwest Sumba Regency. The participants of the activity were the children of the Lombu Village, totaling 44 people. The purpose of this assistance is to increase children's understanding of literacy in the Lombu village. The implementation method of this activity consists of several stages including: (1) analysis of needs and potential in the village, (2) interviews with village officials, (3) mapping of literacy program activities , (4) implementation of scientific literacy activities, (5) evaluation of the program and follow-up plan in the Lombu village. The results of the study of this activity show that there is a greater understanding of science through practice with children in Lombu village, especially capillarity science, floating eggs and magic powder.
STUDY OF PHOTOCATALYTIC HYDROGEN PRODUCTION OVER Ni-DOPED ZnO AND TiO₂ PHOTOCATALYSTS VIA CHEMICAL STABILIZATION Frendi Maulana; Yohanes Engge
Multidisciplinary Indonesian Center Journal (MICJO) Vol. 3 No. 1 (2026): Vol. 3 No. 1 Edisi Januari 2026
Publisher : PT. Jurnal Center Indonesia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62567/micjo.v3i1.2314

Abstract

This study synthesized Ni-doped ZnO (Ni0.05Zn0.95O) and TiO2 (Ni0.05Ti0.95O2) via immersion-assisted coprecipitation for hydrogen production. UV-Vis confirmed bandgap reduction to 2.87 eV (ZnO) and 2.82 eV (TiO2), enabling visible light activity. XRD and SEM verified Ni incorporation and a significant reduction in crystal size (to 21 nm). To mitigate rapid particle sedimentation (25 min), sodium silicate was applied as a dispersant, successfully extending suspension stability to 4 hours. Notably, this chemical stabilization maintained a lower reactor temperature (49°C) compared to mechanical stirring (52°C), preventing efficiency loss due to thermal effects. Ni0.05Zn0.95O exhibited the highest photocatalytic activity, attributed to its superior Ni atomic composition. This research demonstrates that combining Ni-doping with chemical dispersion effectively optimizes both the electronic and physical properties of photocatalysts for enhanced hydrogen harvesting.
Co-Authors Frendi Maulana Yohanis U. Kaleka Yulita Adelfin Lede