IJRERD (ISSN: 2455-8761) Volume No. 06 - Issue No. 12, December 2021 S. No. Article Title & Author Name Page No. Download/View 1 The Role of Innovation in Economic Development Dr Smitha Pillai || Dr Shumayela Hasan || Leslene Sunny 01-06 2 Design, Fabrication and Testing of Falling Head Permeability Test Apparatus Alyasa‟u Jafaru || Ghazali Muhammad Sani 07-13 3 Design the generator Battery supervision in the Base Transceiver Station Nguyen Thi Xoan || Tran Van Binh || Ha Ngoc Thuận || Bach Van Nam 14-22 4 Design and Analysis of Two Stage and Single Stage OP-AMP in 90nm CMOS Technology Pham Duy Khanh || Tran Van Binh || Nguyen Thi Xoan || Ha Ngoc Thuan 23-31