This issue consists of 5 articles from 13 authors affiliated with 4 institutions from 2 countries including:

• Indonesia (Universitas Pendidikan Indonesia, Universitas Sultan Ageng Tirtayasa, UIN Sunan Gunung Djati Bandung)
• India (Osmania University)

Articles

Processing and Interpretation of Magnetic and IP-Resistivity Data

K. Haritha

How to Calculate and Design Shell and Tube-type Heat Exchanger with a Single Heat Transfer

Risti Ragadhita, Asep Bayu Dani Nandiyanto

Design and Construction of Portable Oxygen Concentrator using Pressure Swing Adsorption Technology

Yunus Bahari, Sri Agustina, Teguh Kurniawan

Sustainable Packaging: Bioplastics as a Low-Carbon Future Step for the Sustainable Development Goals (SDGs)

Jumharijah Basnur, Muhammad Fakhri Ferdian Putra, Shabrina Vee Amelia Jayusman, Z. Zulhilmi

Implementing Project-Based Worksheets on Making Kaolin Soap with the Addition of Kefir Curd to develop students' scientific performance in Islamic School

Teja Zakiah Darojah, Neneng Windayani, Ferli Septi Irwansyah