Study of Crystal Structure, Lattice Strain, and Elemental Content of Natural Iron Sand Nanoparticles Synthesized by the Coprecipitation Method by Tulus Na Duma, Syahrul Humaidi, Erna Frida, Mohd. Mustafa Awang Kechik, Muhammadin Hamid, Martha Rianna, Novita, Rahmadhani Banurea, Norazimah Mohd Yusof, Nur Jannah Azman

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Polyethylene glycol-magnetite composite encapsulated concrete as a thermal energy storage by Achmad M.S. Sebayang, Syahrul Humaidi, Timbangen Sembiring, Anggito P. Tetuko, Erna Frida, Perdamean Sebayang, Martha Rianna, Amdy Fachredzy, Muhammad A.H. Nabawi, Muhammad Fauzi, Eko A. Setiadi, Nining S. Asri, Ayu Yuswita Sari

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