January 2022

Space-earth coupling with relation to earth’s thermal capacity: A case study for Nsukka Region, Nigeria

The radiation coming from the sun to the earth is the only form of incoming radiant energy that determines the heat balance and thermal regime of the earth. Variation of solar radiation is the single most important factor affecting the earth’s surface temperature. This study seeks to investigate the relationship between ambient temperature and soil temperature with a view to determine the existence of space-earth...

Author(s): Yakubu J. A., Onyeodi U. A., Daniyan L. O., Shuaibu A. and Abangwu U. J.  

January 2022

Mantle electrical conductivity determination employing the ionospheric solar quiet day (Sq) currents in the Southern African regions

Solar quiet (Sq) daily currents variation obtained in the Hermanus (34.34oS, 19.22oE), Tsumeb (19.24oS, 17.72oE), Hartebeesthoek (25.68oS, 28.09oE) and Maputo (25.97oS, 32.57oE), were employed in determining the mantle electrical conductivity depth profile of the Southern African region. The external and internal contributions in the solar quiet field were separated using the spherical harmonic analysis (SHA), after...

Author(s): Ngozi Agatha Okwesili, Francisca Nneka Okeke, Daniel Nnaemeka Obiora, John Akor Yakubu, Johnson Uchenna Abangwu and Kiyohumi Yumoto  

February 2022

Effect of soaking sample cubes on concrete compressive strength: The case of Ethiopian Construction Industry

Concrete is a major component of construction work composed of fine and coarse aggregates bound together with a cement-water solution paste produced with hydration process. Concrete is best characterized by its compressive strength and relatively low in cost as well as the availability of ingredients that makes it the most favorable component of construction compared to other materials like steel. However, this...

Author(s): Zinabu Tebeje