Browsing by Author "Nwankwo, LI"
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Item Cooling Effect of Some Materials in Clay Composite Bricks for Tropical Region(School of Environmental Sciences, Modibbo Adama University of Technology, 2014) Alabi, AB; Babalola, OA; Nwankwo, LI; Olatunji, SThe thermal resistive effect of embedded materials in composite bricks resulting in cooling has been investigated. Different particulate materials and continuously aligned polyethylene fibers were used as supposed thermal resistors in preparing the bricks for houses in the tropical region. The face change in temperature {Outside temperature(T1) – Inner Temperature (T2)} across the brick insulated with particulate wood dust, paper, PVC, palm kernel, glass, and no-material are 27.9, 27.5, 19.0, 24.0, 25.5, and 26.6 °C respectively after 90 minutes and 26.2, 26.3, 17.9, 22.9, 22.8 and 24 °C respectively after 120 minutes. It is observed that ΔT°C after 90 and 120 minutes are higher for wood dust and paper than brick with no material but lower for PVC, palm kernel, and glass. A high face change in temperature indicates a drop in temperature T2, resulting in a cooling effect if used in building bricks. The same cooling effect was observed when continuous and aligned polyethylene fibers were used to make fiber–clay composite bricks. A side of each sample was subjected to the heat of about 70°C and heat transferred was measured at the other side as done for particulate-embedded bricks. Change in temperature ΔT°C was found to increase with the increasing quantity of polyethylene fibers embedded in the samples 34.2°C (0%), 35.4°C (0.5%), 35.5°C (1%), 35.7°C (1.5%), 36.6°C (2%) and 37.4°C (2.5%), these show that heat transfer decreases due to decrease in T2 with the quantity of fiber. The result shows that the effect is continuous and tends to equilibrium and the change in temperature becomes steady with time.Item Estimation of Sedimentary Thickness of Maiduguri, Northeastern Nigeria, from Fourier Analysis of Aeromagnetic Data(2016) Nwankwo, LI; Sunday, J. A; Lawal, T. O; Ige, S. O; Shehu, A. TA quantitative interpretation of the aeromagnetic anomalies of Maiduguri (Sheet 90) in the north-eastern region of Nigeria has been carried out using Fourier transform method. The study arear covers approximately 3,025 square Kilometers and forms part of Chard Basin. Regional anomalies were removed from the total magnetic field using 2D least method and the resulting residual data were used to obtain Fourier Spectra of 20 selected profiles. Slopes of high and low frequency portions of each spectrum were utilized to estimate depths to shallow and deeper magnetic sources. The results show that the depths to shallow and deeper magnetic sources vary from 0.30 to 0.84 km with an average of 0.42 km and from 0.85 to 3.27 km with an average of 1.59 km respectively. Depths to deeper magnetic sources are normally inferred as sedimentary thickness; therefore the results indicate that the estimated thickness of sedimentary fill in Maiduguri area of Chad basin ranges between 0.85 and 3.27 kmItem Structural and Qualitative Analysis of Solid Minerals (Marble) in Selected Locations in Nigeria(Nigerian Institute of Physics, 2013) Alabi, AB; Olatunji, S; Babalola, OA; Nwankwo, LI; Johnson, LM; Odutayo, JO; Alabi, AMarbles are formed from the recrystallization of limestone or dolomite during metamorphism and occur as a coarse-grain rock composed of interlocking calcite crystals. The structural and porosity analysis of some selected Nigerian marbles were investigated with a view of establishing crystal configuration and constituents of the marble in Nigeria namely: Igbeti, Oyo State; Olayinka, Kwara State; Jakura, Kogi State; Biribiri, Niger State and Takalafia, Nassarawa State. The samples were examined by X-ray diffraction which confirmed the presence of CaCO3 in all the samples. Other constituents present are Calcium Magnesium, Calcium Magnesium Carbonates, and Magnesium Carbide. The average grain sizes of the Samples are 32.15, 31.42, 31.47 and 30.95 nm from Igbeti, Olayinka, Biribiri, Takalafia, and Jakura respectively. The samples were further examined by density profiling to determine the porosity of the marble samples. The comparison of the dry and wet density of the samples in percentage change in density revealed the porosity of all the samples and it was deduced that the marble sample has different pore size due to their formation processes. The porosity for the samples are as follow: from Igbeti (69%), Biribiri (62.4%), Takalafia (24.9%), Olayinka (10.3%), and Jakura (13.8%).