January 2020

Assessment of groundwater quality condition at Tarauni dumpsite area, Kano Northwestern Nigeria

2-D resistivity imaging and physicochemical analysis were used to investigate the intrusion of leachates on groundwater quality around a dumpsite in Tarauni Local Government Area of Kano State, Nigeria. Four (4) imaging traverse lines were established and Wenner configuration was adopted using an electrode spacing from 5.0, 10.0, 15.0 to 60.0 m. Data collected from the imaging were inverted using AGI EarthImager 2D...

Author(s): Ismaila Adenoyi Sule, Mohammed Saleh, Maryam Lawan, Abdulrahim Ali Bunawa and Farouq Mohammed Jibril  

February 2020

Estimation of swelling potential of Enugu Shale using cost effective methods

The behavior of swelling soils is mainly governed by its mineralogical composition as well as its environmental factors and stress history. Enugu Shale is one of these shales that assessment of its soil swelling potential cannot only be based on its mineralogical composition alone. The identification of its clay mineral types is basic to understand the roles of other factors of swelling in the soils. The results of...

Author(s): Chidiebere Nnamani and Ogbonnaya Igwe  

March 2020

Solar events and seasonal variation of foF2 at Korhogo station from 1992 to 2002

In this paper we report the effect of solar events (CMEs and solar winds) on foF2 diurnal profiles at Korhogo Station (Long 8.427° W; Lat: 9.336° N; dip: -1.88°) from 1992 to 2002. We reviewed on seasons and all the four geomagnetic activity classes (Quiet activity, recurrent activity, Shock activity, and Fluctuating activity). The results show that (1) Coronal Mass Ejections (CMEs) and high-speed solar...

Author(s): Karim Guibula, Jean Louis Zerbo, Salfo Kaboré and Frédéric Ouattara  

March 2020

Performance assessment of cross polarization models at millimetre wavelengths along Earth–Space path in Nigeria

Rain-induced depolarization impairments have been a constraint on the effective use of satellite communication systems at millimetre wave band especially in the tropical regions like Nigeria. This region often experiences high and varying degree of rainfall intensity accompanied with large raindrops due to distortion of raindrops when dual orthogonal polarization is employed to double the channel capacity without...

Author(s): H. O. David, M. O. Ajewole, J. S. Ojo and A. T. Adediji