Vol 22, No 1 (2025)

Table of Contents

Articles

Volumetric-gravimetric synergy in biomass-derived carbon supercapacitors: A case study on dried banana leaf waste
Apriwandi Apriwandi
PDF
1-10
The effect of reaction time and oil-to-methanol ratio on the calorific value of biodiesel produced from chicken fat oil
Alltop Amri Ya Habib, Tengku Emrinaldi, Yogi Yolanda, Yelmida Azis
PDF
11-14
Evaluation of the Arima-Kalman model in predicting rainfall in Medan City in 2023 using observation data from 2013 – 2022
Alva Josia Lumbantoruan, Yahya Darmawan, Munawar Munawar, Nardi Nardi, Fendy Arifianto, Ervan Ferdiansyah
PDF
15-22
Empirical orthogonal functions (EOF) analysis of spatial patterns of dominant variability in the Indian Ocean
Willy Bonanja Manik, Yahya Darmawan, Munawar Munawar, Nardi Nardi, Fendy Arifianto, Ervan Ferdiansyah
PDF
23-26
Visualization and simulation of ZnO microstructure with various crystal structures and doping compositions based on XRD patterns using VESTA
Dikri Aminnurdin, Ari Sulistyo Rini
PDF
27-34
Modification of magnetic properties and morphology of iron oxide particles of natural sand from Rokan River through copper doping and preparation using ball milling method
Elika Gultom, Salomo Sinuraya, Erwin Amiruddin, Awitdrus Awitdrus
PDF
35-42
The effect of variations in the size of milling balls on the magnetic properties and morphology of natural sand particles in the Rokan River
Dini Afriyunita, Salomo Sinuraya, Erwin Amiruddin, Juandi Muhammad
PDF
43-48
Making supercapacitor carbon electrodes from lemongrass leaf biomass with variations in physical activation temperature
Akmal Jaliaz, Awitdrus Awitdrus
PDF
49-52
Effect of coagulation and filtration in slow sand filters on iron absorption in groundwater
Ayu Cahyati, Krisman Krisman
PDF
53-56
Interpretation of groundwater potential based on the Cooper Jacobs method combined with Schlumberger geoelectricity in Simpang Tiga Village, Pekanbaru City
Joko Kurniawan, Juandi Muhammad
PDF
57-60