Selected recent works:

Ocaya, R.O. & Malevu, T.D. (2025) -  Space debris is falling from the skies. We need to tackle this growing danger. Nature 639, 571-573 (2025). doi: 10.1038/d41586-025-00797-7

Ocaya, R. (2024). Extraction of Semiconductor Diode Parameters. Springer Nature. ISBN 978-3-031-48846-7. doi: 10.1007/978-3-031-48847-4

Ocaya, R.O., Yakuphanoglu, F. (2021), Ocaya–Yakuphanoglu method for series resistance extraction and compensation of Schottky diode I-V characteristics, Measurement, Vol. 186 art. No. 110105. doi: doi: 10.1016/j.measurement.2021.110105

Invited Talks:

•  Method for series resistance extraction from the I-V characteristics of Schottky diodes, 8th International conference on materials science and nanotechnology for next generation (MSNG2021), 14 -16 July 2021 http://msng2021.fytronix.com/invited_speakers.html

• 5th Collaboration Symposium - Central University of Technology, 27th November 2020

• The Reuse and Recyling of Electronic Components, a talk in the "60 Years Celebration of University of Zululand", 9th October 2020

Computing, Mathematical methods, New techniques for device characterization, Material science, and  Embedded and microcontroller-based instrument design.

Solid State Physics (PHYS3724)

Electronics (PHYS2624)

Electronics (PHYE6844)

Computational Physics (PHYS6864)

Semiconductors (PHYI6864).

1. Ambassador - UFS Rhodes Scholarship Trust Ambassador (2020-2023)

2. Member - Insight Physics journal http://insight.piscomed.com/index.php/IP/about/editorialTeam

3. External Examiner - 

1. University of Botswana (2006-present)
2. Medical University of South Africa (formerly Medunsa – Pretoria Campus): 2006-2008
3. NWU (Mafikeng Campus): 2012 –present
4. School of Physics & Chemistry (UKZN): 2020 and ongoing
5. University of Limpopo

4. Reviewer for over 30 journals