Authors: Akhmad Hanan and Mayora Bunga Swastika* There is no denying that all countries in the world should use clean energy in the future. Based on...
The increasing of technological advances, the needs of each country are increasing. The discovery of innovations, the production of goods that are increasing, and renewing energy...
The “rare-earth elements”, also called rare-earth metals or rare-earth oxides, or lanthanides are a set of 17 white soft heavy metals. The uses, applications and demand...