B. Elhub, Sohif Mat, K. Sopian, A.M. Elbreki, Mohd Hafidz Ruslan, A.A. Ammar.  (2018).  Performance evaluation and parametric studies on variable nozzle ejector using R134A.  - Case Studies in Thermal Engineering.  . 

Amanda Halim, Ahmad Fudholi, Kamaruzzaman Sopian, Mohd Hafidz Ruslan,Stephen J. Phillips.  (2018).  Feasibility study on hybrid solar photovoltaic with diesel generator and battery storage design and sizing using HOMER Pro.  - Jurnal Kejuruteraan.  . 

Cheku Nurul Aisyah, Ahmad Fudholi, Mohd Yusof OthmAN, Adnan ibrahim, Mohd Hafidz Ruslan, Kamaruzzaman Sopian.  (2018).  Kecekapan pengumpul PV/T menggunakan pengumpul terma reka bentuk pilin (Efficiency of PV/T Collector using Spiral Thermal Absorber Design).  - Sains Malaysiana.  . 

Idris Zulkifle, Mohd Hafidz Hj Ruslan, Mohd. Yusof Hj Othman, Zahari Ibarahim, Kamaruzzaman Sopian.  (2018).  Pengeringan asam gelugur (garcinia atroviridis) menggunakan sistem pengering suria.  - Jurnal Teknologi (Sciences & Engineering).  . 

Ali, M. K. M., Sulaiman, J., Yasir, S. M., Ruslan, M. H., Fudholi, A., Muthuvalu, M. S., and Ramu, V..  (2017).  Cubic Spline as a Powerful Tools for Processing Experimental Drying Rate Data of Seaweed Using Solar Drier.  - Malaysian Journal of Mathematical Sciences.  159-172. 

ROONAK DAGHIGH, MOHD HAFIDZ RUSLAN,KAMARUZZAMAN SOPIAN.  (2015).  Parametric studies of an active solar water heating system with various types of PVT collectors.  - Sadhana-Academy Proceedings in Engineering Sciences.  2177-2196. 

M. A. Islam, K. S. Rahman, F. Haque, N.A. Khan, M. Akhtaruzzaman, M. M. Alam, H. Ruslan, K. Sopian, N. Amin.  (2015).  Effect of Sn Doping on the Properties of Nano-Structured ZnO Thin Films Deposited by Co-Sputtering Technique.  - Journal of Nanoscience and Nanotechnology.  9184-9191. 

S. A. Shahahmadi, B. Yeganeh, N. Huda, N. Asim, M. Hafidz, M. M. Alam, Z. A. AlOthman, K. Sopian, and N. Amin.  (2015).  Properties of a-SiGe Thin Films on Glass by Co- Sputtering for Photovoltaic Absorber Application.  - Journal of Nanoscience and Nanotechnology.  9275-9280. 

Al-Shamani A.N., Sopian K., Mohammed H.A., Mat S., Ruslan M.H., Abed A.M..  (2015).  Enhancement heat transfer characteristics in the channel with Trapezoidal rib-groove using nanofluids.  - Case Studies in Thermal Engineering.  48-58. 

Mohd. Yusof Hj. Othman, Faridah Hussain, Kamaruzzman Sopian, Baharuddin Yatim & Hafidz Ruslan.  (2013).  Performance Study of Air-based Photovoltaic-thermal (PV/T) Collector with Different Designs of Heat Exchanger.  - Sains Malaysiana.  42(9):1319-1325. 

Mohd. Yusof Hj. Othman, Ahmad Fudholi, Kamaruzzaman Sopian, Mohd. Hafidz Ruslan & Muhammad Yahya.  (2012).  Analisis Kinetik Pengeringan Rumpai Laut Gracilaria changii Menggunakan Sistem Pengering Suria.  - Sains Malaysiana.  41(2):245-252.