Scholarly work in the Department of Physics with Electronics
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Item Extension of Designed Public Potable Water Distribution Channel to Igberen-Aboloyin Community, Ota, Ogun State, Southwestern Nigeria(International Journal of Recent Research in Interdisciplinary Sciences, 2024) Adedulu Olalekan; Atanley Pauline; Atanley Paul; Alawami Muhammed; Lasisi AdewaleIgberen–Aboloyin Community of Ado-Odo/Ota local government Area of Ogun state, Southwestern Nigeria is susceptible to disease outbreaks due to the presence of Kurata dumpsite located in the heart of the community. Over the years, leachate from this dumpsite had percolated through the soil to contaminate the water table, rendering groundwater in this environment unfit for consumption. To ensure the availability of potable water to this community, the design of a water distribution network was made in this research. Coordinates and elevations were taken at various points in the field using the Global Positioning System (GPS). The elevation data was simulated using a mathematical function to generate a colour-coded Digital Elevation Model (DEM) depicting varying heights across the area; facilitating an easy identification of the most suitable part to site a storage tank to serve the community. The geospatial road network of the environment was imported and manipulated using architectural design software while referencing the generated Digital Elevation Model (DEM) for the pattern and structure of the terrain to produce the new water distribution network for the Igberen-Aboloyin community. Results from this study showed that the population of this community would increase to about 60 thousand by the year 2040 with a maximum daily water demand of about 8.64 million litres. The execution of this research would ensure an uninterrupted supply of this required quantity of water to the community till at least the year 2040 thereby reducing the health risk posed to the populace through the use of contaminated water. This study has been able to design a distribution channel for the inhabitants of the Igberen-Aboloyin community in Ota, Ogun State, Southwestern Nigeria which can meet the Sustainable Development Goals (SDG 6 and 15) of “Clean Water and Sanitation” and “Life on Land” when the design is implemented. Distribution network, Dump sites, Groundwater, Leachates, Potable water, Water demand.Item Models for Prediction of Global Solar Radiation On Horizontal Surface for Akure, Nigeria(Global Journal of Pure and Applied Sciences, 2016) Akinnawo Olumide Olufemi; Oludotun James Samuel Oladunjoye; Usifo Abel Giwa; Adejuwon Samuel OluyemiThe estimation of global solar radiation continues to play a fundamental role in solar engineering systems and applications. This paper compares various models for estimating the average monthly global solar radiation on horizontal surface for Akure, Nigeria, using solar radiation and sunshine duration data covering years 1981 to 1995. The analysis was performed using Angstrom models, two dimensional principal component analysis (PCA) and adaptive neuro-fuzzy inference system (ANFIS). The performance of the models were tested using statistical indicators such as mean bias error (MBE), mean percentage error (MPE), root mean square error (RMSE) and correlation coefficient (CC). The results indicated that ANFIS and linear regression analysis provide relatively higher degree of prediction, with the performance of ANFIS slightly better.Item Fuzzy Model, Neural Network and Empirical Model for the Estimation of Global Solar Radiation for Port-Harcourt, Nigeria(Journal of Scientific Research & Reports, 2017) Akinnawo Olumide Olufemi; Adebayo Oluwaseun Caleb; Usifo Abel Giwa; Ogundele Abiodun KazeemThe invaluable role of the estimation of global solar radiation in solar engineering systems provides very useful direction for various solar applications. This paper employs the Adaptive Neuro Fuzzy Inference System (ANFIS), Artificial Neural Network (ANN) and regressive technique for the prediction of global solar radiation(GSR) on horizontal surface using temperature swing and relative humidity as input parameters covering years 1981 to 2005. The performance of the models was tested using statistical indicators such as mean bias error (MBE), root mean square error (RMSE), and correlation coefficient (CC). The results with ANFIS and ANN method provide a relatively better prediction with ANFIS the more preferable.Item Effect Of Coulomb Interactions on The Amplitude Of Persistent Currents In One Dimensional Disordered Mesoscopic Metallic Rings(arXiv preprint, 2021) Onaiwu Kingsley Nosakhare; Okanigbuan Robinson O; Ehika SPersistent current is a small but perpetual electric current that flows in metallic rings in the absence of any applied source. We compute the persistent currents of one-dimensional disordered metallic rings of interacting electrons in the presence of impurity on lattices up to 8-sites at half-filling and also away from half-filling using the Lanczos algorithm. For the case of half-filling, we observe that both interaction and disorder suppress the amplitude of the persistent currents by localizing the electrons. However, in the presence of disorder and away from half-filling, the Coulomb interaction is observed to enhance the persistent current. Furthermore, in the half-filled case, there is a transition from metal to insulator as U is increased significantly. In addition, shifting away from half-filling, the system is observed to remain in the metallic state irrespective of the value of the Coulomb repulsion (U). The observations are quite in agreement with the results from other techniques.Item Hamiltonian Complete Number of Some Variants Of Caterpillar Graphs(arXiv preprint, 2025-04) Onaiwu Kingsley Nosakhare; Adefokun Tayo Charles; Ajayi Deborah Olayide; Ogundipe Opeoluwa LawrenceA graph G is said to be Hamiltonian if it contains a spanning cycle. In this work, we investigate the Hamiltonian completeness of certain classes of caterpillar graphs, which are trees with a central path to which all other vertices are adjacent. For a non-Hamiltonian graph G, the Hamiltonian complete number H(G) is the minimum number of edges that must be added to G to make it Hamiltonian. We focus on both regular and irregular caterpillar graphs, deriving explicit formulas for H(G) in various cases. Specifically, we show that for a regular caterpillar graph Gn(k) where each vertex on the central path is adjacent to k leaves, H(Gn(k)) = n(k−1). We also explore irregular caterpillar graphs, where the number of leaves adjacent to each vertex on the central path varies, and provide bounds for H(G) in these cases. Our results contribute to the understanding of Hamiltonian properties in tree-like structures and have potential applications in network design and optimization.Item Ground State Properties Of The One-Dimensional Hubbard Model: Symmetry Projected Variational Wave Function Approach(arXiv preprint, 2021) Onaiwu Kingsley Nosakhare; Okanigbuan Robinson OWe use the C4v symmetry group of the 4*site Hubbard model to construct a ground state variational wave function of two- and four interacting electrons. In the limit U 0, ground state energies of the two- and four interacting electrons system is of the order *4t. The variational wave function of the four interacting electrons obtained using the B1 irreducible representation is valid for on-site Coulomb repulsion, while the one obtained using the A1 representation is valid for negative values of the Coulomb interaction. The system exhibits antiferromagnetic correlations.Item Evaluation of Lateritic Soil Using 2-D Electrical Resistivity Methods at Alapoti, Southwestern Nigeria(Global Journal of Pure and Applied Sciences, 2021-04) Onaiwu Kingsley Nosakhare; Akinnawo Olumide Olufemi; Adeola Adewole John; Usifo Abel GiwaA 2-D resistivity survey was carried out in Alapoti, Ogun State, a sedimentary terrain of South-western Nigeria. This area lies between longitude 0060 34′0″N and 0060 40′0″N and latitude 00302′0″E and 00306′0″E. The wenner alpha electrode configuration was engaged through out in this study. Ten profiles were covered; five in the north-south direction, and the other five in the west-east direction. To obtain a good 2-D picture of the subsurface, the coverage of the measurements must be 2-D as well. The distance between adjacent traverse is 25 metres. The data from each 2-D survey line was inverted independently with RES2DINV to give 2-D cross-sections with averages of 4.8 iteration and RMS error of 8.15%. A contoured pseudosection conveys a qualitative two- dimensional resistivity variation with depth within the subsurface. The inversed model resistivity sections created models for the subsurface resistivity using an iterative smoothness constrained least square inversion and are interpreted to generate the subsurface geologic characteristics. Results from 2-D inversed resistivity section showed that the second layer with resistivity value of about 200 m to 600 m and thickness of about 4.0m is composed of lateritic clay. The third layer is made up of moderate laterite having a thickness of about 3.0m and apparent resistivity ranging from 600 m to 1,000 m, while the fourth layer of apparent resistivity value 1,000 m to 1,500 m is laterite but rich in sand and it is located at a deep of about 12.0m.