1. Okonkwo, W.I., C.J. Ohagwu, O. Ojike, G.I. Ezenne, K.E. Olayinka and A.U. Onyechi, 2022. Socio-economic importance of solar energy application in poultry production system. J. Sci. Res. Rep., 28: 112-126.
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2. Kolawole, E. and W.I. Okonkwo, 2022. Impacts of climate change on environment and the remedies. Int. J. Weather Clim. Change Conserv. Res., 8: 1-9.
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3. Okonkwo, W.I., C.O. Akubuo and C.J. Ohagwu, 2021. Design, construction and performance evaluation of a trombe wall poultry day-old chick brooding house. J. Food Process. Technol., Vol. 12. .
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4. Ogbu, B.U., W.I. Okonkwo and S.N. Ugwu, 2021. Development of a modified environment for oyster mushroom (Pleurotus ostreatus) production system for rural use in Southeast Nigeria. Niger. J. Technol., 40: 518-525.
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5. Ugwu, S.N., O. Ojike, W.I. Okonkwo, E. Okafor, B.O. Ugwuishiwu and E.A. Echiegu, 2020. Evaluation studies of a mixed mode solar kiln with phase change material and distributed-type solar kiln. Case Stud. Ther. Eng., Vol. 22. 10.1016/j.csite.2020.100748.
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6. S.A. Ngabea, W.I. Okonkwo, E.A. Echiegu, G.I. Okafor, P.I. Akubor, 2020. Optimization of temperature, packaging materials and time on the proximate compositions of Bambara nut flour. Asian J. Plant Sci., 19: 343-353.
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7. Obi, O.F., J.C. Ezema and W.I. Okonkwo, 2020. Energy performance of biomass cookstoves using fuel briquettes. Biofuels, 11: 467-478.
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8. Chikwado, U.K., O.W. Ifeanyi and O.G. Ifeanyi, 2020. Determination of cashew juice specie's shelf-life at natural storage using multivariate regression model. Int. J. Recent Eng. Sci., 7: 10-18.
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9. Asoiro, F.U., W.I. Okonkwo, C.O. Akubuo, N.O. Nweze and C.N. Anyanwu, 2019. Effects of temperature and time on oil extraction from some Nigerian indigenous fresh water microalgae species. CIGR J., 21: 159-169.
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10. Ugwu, K.C., C.C. Mbajiorgu, W.I. Okonkwo and A.O. Ani, 2018. Design, fabrication and performance evaluation of a portable hand-held refractometer. Niger. J. Technol., 37: 537-542.
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11. Kwino, D.I., W.I. Okonkwo and O.F. Obi, 2017. Effects of roasting on the physical properties of Monodora myristica (African nutmeg). Int. Food Res. J., 24: 1148-1155.
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12. Okonkwo, W.I., E.A. Echiegu, N.J. Ogbuisi and J.T. Liberty, 2015. Characterization of a fibre reinforced plastic concentrating solar cooker. Int. J. Innovation Appl. Stud., 10: 1058-1064.
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13. Obi, O.F., C.O. Akubuo and W.I. Okonkwo, 2013. Development of an appropriate briquetting machine for use in rural communities. Int. J. Eng. Adv. Technol., 2: 578-582.
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