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Tom Mboya University

DR. NICHOLAS CYRIL ONGWEN, PhD

DR. NICHOLAS CYRIL ONGWEN, PhD

DR. NICHOLAS CYRIL ONGWEN, PhD

Faculty of Physical and Biological Sciences

Dr. Ongwen holds a PHD in physics (expereimental and computational mechanics, thermodynamics, and acoustics) from Maseno University (Kenya). His research experience spans over 6 years with special interest in computational and experimental mechanics, acoustics, electronics, and thermodynamics of materials; micro electromechanical systems (MEMS); porous materials (earth blocks) for building and construction of affordable houses; materials for the aerospace; and material discovery by machine learning. Dr. has publised a total of 21 journal articles since 2019.

nongwen@tmu.ac.ke

Publications

1. Alruqi, A. B.; Ongwen, N. O. Effect of pressure on the structural and mechanical properties of cubic silicon carbide reinforced with aluminum and magnesium. Aerospace, 2024, Volume 11, 1026 (1-11). https://doi.org/10.3390/aerospace11121026.
2. Alruqi, A. B.; Ongwen, N. O. Ab initio investigation of the mechanics and thermodynamics of the cubic EuAlO3 and GdAlO3 perovskites for optoelectronic applications. Crystals, 2024, Volume 14, 1084. https://doi.org/10.3390/cryst14121084.
3. Alruqi, A. B.; Ongwen, N. O. First principles investigation of elastic, electronic and thermoelectric properties of lead-free Cs–X–I (X = Pb, Gd, Nd, Y) perovskites. Journal of Physics Communications, 2024, Volume 8(12), 125004. https://doi.org/10.1088/2399-6528/ad8da8.
4. Ongwen, N. O. Synthesis and characterization of cadmium tin oxide for MEMS substrates and its comparative computational study with silicon and silicon carbide. Brazilian Journal of Physics, 2024, Volume 54 (254), 1-12. https://doi.org/10.1007/s13538-024-01624-6.
5. Ochieng, V. O.; Ongwen, N. O.; Otieno, C. Tuning the structural and mechanical properties of SiC-Li and SiC-Na alloys for aerospace application: An ab initio study. Journal of Physics Communications, 2024. https://doi.org/10.1088/2399-6528/ad756f.
6. Alruqi, A.B.; Ongwen, N.O. Structural and mechanical properties of NbN alloyed with Hf, In, and Zr for orthopedic applications: A first-principles study. Inorganics, Volume 24, 43(1-10), 2024. https://doi.org/10.3390/inorganics12020043.
7. Benlachemi, R.; Ogam, E.; Ongwen, N.; Boudour, A.; Fellah, Z.E.A. Investigating the Young’s modulus of Cu-Al-Be shape memory alloy using a phase diagram, vibration spectroscopy and ultrasonic waves. Journal of Alloys and Compounds, Volume 976, 173010 (1-18), 2024. https://doi.org/10.1016/j.jallcom.2023.173010.
8. Alruqi, A.B.; Ongwen, N.O. A comparative thermodynamic study of AlF3, ScF3, Al0.5Sc0.5F3, and In0.5Sc0.5F3 for optical coatings: A computational study. Coatings, Volume 13, 1840, 2023. https://doi.org/10.3390/coatings13111840.
9. Kipkorir, P.; Ongwen, N.O.; Mageto, M.; Odari, V. & Gaitho, F.M. Mechanical properties of Al–Mg–Si alloys (6xxx Series): A DFT-based study. Alloys, Volume 2, 213–226, 2023. https://doi.org/10.3390/alloys2030015.
10. Ongwen, N. & Adel A. B. Acoustics of compressed earth blocks bound using sugarcane bagasse ash and water hyacinth ash, Applied Sciences (MDPI), Volume 13, 2023, 8223(1-11). https://doi.org/10.3390/app13148223.
11. Ouma, J., Ongwen, N., Ogam, E., Auma, M., Fellah, Z. E. A., Mageto, M., Mansour, M. B., & Oduor, A. Acoustical properties of compressed earth blocks: Effect of compaction pressure, water hyacinth ash and lime, Case Studies in Construction Materials, Volume 18, 2023, e01828(1-9), 2023. https://doi.org/10.1016/j.cscm.2023.e01828.
12. Ongwen, N., Ogam, E., Fellah, Z. E. A., Mageto M., Othieno, H., & Otunga, H. Thermal properties and pressure-dependent elastic constants of cadmium stannate as a substrate for MEMS: An ab initio study, Physica B: Condensed Matter, Volume 651, 414599(1-7), 2023. https://doi.org/10.1016/j.physb.2022.414599.
13. Fellah, Z.E.A.; Bouchendouka, A. Martin, P.; Marchand, L.; Ongwen, N. et al. Ultrasonic propagation in fractal porous material having rigid frame, 10th ECCOMAS Thematic Conference on Smart Structures and Materials, 1006-1017, 2023. doi: 10.7712/150123.9852.446938.
14. Bouchendouka, A., Fellah, Z. E. A., Larbi, Z., Ongwen, N. O., Ogam, E., Fellah, M., & Depollier, C. Flow of a Self-Similar Non-Newtonian Fluid Using Fractal Dimensions, Fractal and Fractional, Volume 6 (582), 1-11, 2022. https://doi.org/10.3390/fractalfract6100582.
15. Benmorsli, D., Fellah, Z. E. A., Belgroune, D., Ongwen, N. O., Ogam, E., Depollier, C., & Fellah, M. Transient Propagation of Longitudinal and Transverse Waves in Cancellous Bone: Application of Biot Theory and Fractional Calculus, Symmetry (MDPI), Volume 14 (10), 1-29, 2022. https://doi.org/10.3390/sym14101971.
16. Ongwen, N., Ogam, E., Fellah, Z. E. A., Otunga, H., Oduor, A., & Mageto M. Accurate Ab-initio calculation of elastic constants of anisotropic binary alloys: A case of Fe–Al, Solid State Communications, Volume 353, 30-35, 114879(1-6), 2022. https://doi.org/10.1016/j.ssc.2022.114879.
17. Ongwen, N., Ogam, E. Otunga, H. Oduor, A. Z. E. A. Fellah & Mageto M. Temperature-Dependent Elastic Constants of Substrates for Manufacture of Mems Devices, Kabarak Journal of Research & Innovation, Volume 12 (1), 30-35, 2022. http://ojs.kabarak.ac.ke/index.php/kjri/article/view/524.
18. Fellah, Z. E. A., Fellah, M., Ronsen, R., Ongwen, N., Ogam, E., & Depollier, C., Transient Propagation of Spherical Waves in Porous Material: Application to Fractal Calculus, Symmetry (MDPI), Volume 14 (2), 233-247, 2022. https://doi.org/10.3390/sym14020233.
19. Fellah, Z. E. A., Ronsen, R., Ongwen, N., Ogam, E., Fellah, M. & Depollier, C., Influence of Higher Order Viscous and Thermal Effects on an Ultrasonic Wave Reflected from the First Interface of a Porous Material, Materials (MDPI), Volume 15 (798), 1-15, 2022. https://doi.org/10.3390/ma15030798.
20. Fellah, Z.E.A., Fellah, M., Ongwen, N., Ogam, E. & Depollier, C., Acoustics of Fractal Porous Material and Fractional Calculus, Mathematics (MDPI), Volume 1774 (9) (1-16), 2021. https://doi.org/10.3390/math9151774.
21. Ogam, E., Fellah, Z.E.A., Ogam, G., Ongwen, N. & Oduor, A., Investigation of Long Acoustic Waveguides for the Very Low Frequency Characterization of Monolayer and Stratified Poroelastic Materials, Applied Acoustics (Elsevier), Volume 182, 108200 (1-13), 2021. https://doi.org/10.1016/j.apacoust.2021.108200.
22. Ongwen, N., Chanbi, D. Ogam, E. Otunga, H. Oduor, A. & Z. E. A. Fellah, Corrigendum on “Microstructural and Elastic Properties of Stable Aluminium-rich TiAl and TiAl2 Formed Phase Intermetallics”, Materials Letters (Elsevier), Volume 287, 129295 (1-4), 2021. https://doi.org/10.1016/j.matlet.2021.130701.
23. Ongwen, N., Chanbi, D. Ogam, E. Otunga, H. Oduor, A. & Z. E. A. Fellah, Microstructural and Elastic Properties of Stable Aluminium-rich TiAl and TiAl2 Formed Phase Intermetallics, Materials Letters (Elsevier), Volume 287, 129295 (1-4), 2021. https://doi.org/10.1016/j.matlet.2020.129295.
24. Ongwen, N., Ogam, E & Otunga, H. (2021). Ab initio study of elastic properties of cadmium stannate as a substrate for the manufacture of MEMS devices, Materials Today Communications (Elsevier), Volume 26 (101822), 2021. https://doi.org/10.1016/j.mtcomm.2020.101822.
25. Ongwen N., Oduor A. Odhiambo and Ayieta E. Amolo, Effect of concentration of reactants on the optical properties of iron-doped cadmium stannate thin films deposited by spray pyrolysis, American Journal of Materials Science, Volume 9 (1), 2019.
26. Ongwen N., Oduor A. Odhiambo and Ayieta E. Amolo, Effect of deposition temperature on the optical properties of iron-doped cadmium stannate thin films deposited by spray pyrolysis, International Journal of Scientific and Technical Research in Engineering (IJSTRE), Volume 4 (3), 2019.
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