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Bellstech IR is the Bells University of Technology, Ota Repository that houses and preserves the robust scholarly contributions of the Bellstech Community poised to achieve the following objectives:
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Recent Submissions
Mechanical and Structural Investigation of Zn-MnO2 Coating on Mildsteel
(Scientific Net, 2024-11-01) DEREK Alima O.; FAYOMI Ojo S.I.; ATIBA Joshua O.
Abstract:
Failure in manufacturing industries is a worldwide concern and it occurs most often at elevated temperatures and pressure. Acid, gases, and steam are known to be corrosion and stress-induced propagators resulting in incessant catastrophes. More so, material failure can be due to the substrate material used in the coating while substrate failure can further be classified into the substrate morphology, surface chemistry as well as contamination. Thus, the study developed a multifaceted layer of zinc barrier coating via the electrodeposition technique and observe its response by characterizing the developed coating. The mild steel plate, Zn and MnO2 were procured and characterized according to the ASTM standard. Mild steel of dimension 60×30×2 mm was sectioned and polished using varying sizes of abrasives. The result of the coating thickness showed that Zn-6MnO2 had a weight gain of 0.30g. Zn-12MnO2 was observed to have excellent corrosion performance compared to the as-received and the other formulations of Zn-MnO2 with a corrosion resistance of 2.117 mm/year. The SEM image of Zn-MnO2 showed aggregates of clustered grains, thus, no possible fracture lines were observed on the coating surface. Zn-12MnO2 exhibited a hardness value of 252.72 BHN. Additionally, the EDS of the coatings revealed significant elements that helped in the corrosion performance and hardness properties of the coatings.
Continuous Learning and Employees Peformance in Bells University of Technology, Ota, Ogun State, Nigeria
(Bells University of Technology, 2024-08-06) OLUSUPO, Margaret Odunayo
This study investigates the impact of employee engagement on organizational performance among selected commercial banks in Ota, Ogun State. The objectives of the study were to determine how training and development, work-life balance and employee retention impact organizational performance. Data for the study was sourced primarily with the aid of a structured questionnaire. The study made use of the entire population for the sample study as the population was less than 100 (population < 100). To test the hypotheses, the data was analyzed using descriptive statistics such as percentage, mean, and standard deviation, as well as inferential statistics such as multiple regression analysis. The findings revealed that all variables understudy (raining and development, work-life balance and employee retention) all had a moderately significant impact on organizational performance, showing a predictive value of .95%. The research findings emphasize the multifaceted nature of organizational performance and the necessity for organizations to adopt a holistic approach to talent management; While training and development, work-life balance, and employee retention each play a role in shaping organizational outcomes, their combined influence yields the most significant impact. Thus, organizations must strive to create a conducive work environment that fosters employee growth, well-being, and retention to drive sustained organizational success in the long term. Furthermore, the study recommends that organizations should prioritize the development and implementation of strategies to enhance employee engagement, such as fostering a supportive work environment, providing opportunities for growth and development and promoting a healthy work-life balance.
Determinant of Heavy Metals Organic Pollutions in Fish Sample collected from Ogun River
(Bells University of Technology, 2020-12-10) AJIBODE, Comfort Pelumi; Dr. D. O. Nwude
Fish is generally accepted as a delicacy and serves as an important source of protein consumed daily by all strata of the society. Awareness on the possible exposure to heavy metals and organic pollutants in fish and its associated health risks in Nigeria are generally low. Therefore, this study aims at assessing heavy metals and organic pollutants' levels in the muscle tissues of fish samples from five (5) different fishing locations in the Ogun River, Ogun State. The levels of the heavy metals (Zinc, Lead, Iron, Chromium, Cadmium and Copper) in the muscle tissues of the fish samples were determined by wet digestion method using a Perkin Elmer, Analyst - 200 Atomic Absorption Spectrometer. The mean Zn values in the five (5) different locations (Oyan Dam, Oriyanrin, Adigbe Bridge, Apo Village and Odo-eran Lafenwa) were (4.596±2.820, 5.094±1.216, 4.733±2.033, 6.228±1.348 and 7.771±2.003); mean Pb values were (0.641±1.236, 1.667±3.960, 0.741±0.738, 0.806±0.852 and 0.566±0.353); mean Fe values were (7.805±2.681, 10.391±4.485, 8.281±1.901, 7.971±4.068 and 8.868±2.052); mean Cr values were (0.100±0.166, 0.076±0.071, 0.102±0.095, 0.172±0.149 and 0.052±0.039); mean Cd values were (0.1000.116, 0.074±0.077, 0.101±0.956, 0.174±0.148 and 0.087±0.039) and mean Cu values were (-0.405±0.017, 0.404±0.011, -0.403±0.016, -0.509±0.328 and -0.396±0.130). Most of these values were generally lower than permissible limits of FAO/WHO except Pb and Cr which were higher than the permissible limits. The fish samples contained levels of Zn, Fe, Cd and Cu in the sampled fish muscle tissues. The organic pollutants which include the Organochlorine Pesticides, Polycyclic Aromatic Hydrocarbons and the Polychlorinated Biphenyls were also determined. The Organochlorines and Polyaromatic Hydrocarbons in the fish samples were Soxhlet extracted using n-hexane and dichloromethane. The extracts were cleaned up using silica gel and analyzed using a gas chromatograph equipped with an electron capture detector (GC-ECD) and flame ionization detector (GC-FID) respectively. The Polychlorinated biphenyls were also extracted using n-hexane and cleaned up using a glass column and analyzed using a gas chromatograph equipped with an electron capture detector (GC-ECD). The mean values obtained after the analysis of Polycyclic Aromatic Hydrocarbons, the BaPeq for the first four (4) locations had values that exceeded the permissible limit of 0.002mg/kg (European Commission) while it was absent in the fifth location PCBs 8 (2,4 - Dichlorobiphenyl), 18 (2,2',5 - Trichlorobiphenyl), 157 (2,3,3',4,4'5
Hexachlorobiphenyl) and 180 (2,2',3,4,4',5,5' - Heptachlorobiphenyl) were the principal
contaminants for the Polychlorinated biphenyls while the others were either non-existent or below
the permissible limit of 0.335mg/kg (European Union). For the Organochlorine Pesticides
Endosulfan sulphate was the only pesticides detected in all locations along the Ogun River
Alpha0BHC ranged between BDL and 0.394 mg/kg with Odo-Eran Lafenwa (0.0394 mg/kg
having the highest AlphaOBHC while Oriyanrin had 0.0048. AlphaOBHC was below detectable
limits in samples from Adigbe Bridge. The levels of the Organochlorine Pesticides in the muscle
tissue of the analyzed fish samples was below the accepted Maximum Residue Limits (MRL), a
adopted by the WHO/FAO Codey Alimentarius commission.
Corrosion and Surface Modification of Hybridized Seashell Composite on AA6063 Alloy for Advance Application
(Asian Journal of Chemistry, 2025-08-30) FAYOMI Ojo S.I.; AJIBOLA Otitolaye A.; MIN Ho Soon; OLUWASEGUN Kunle M.
Abstract
This study focuses on utilizing abundantly available seashell ash by dispersing it in AA6063 alloy to form composites. A new aluminium metal matrix composite was developed by reinforcing AA 6063 alloy with particles of seashell ash as reinforcement materials in varying percentages (0, 10, 20, 30, 40 wt.%). The samples were prepared by using the stir casting method. The microstructural characterizations were carried out using optical microscopy and the scanning electron microscope (SEM), revealing particle shape and size descriptions for the composite microstructural features. The results indicate that the composite materials exhibit relatively larger and more uniformly distributed grain sizes compared to the base material. The outcomes demonstrate a significant improvement in the tensile strength and hardness of the composites, accompanied by a decrease in corrosion rates. The best samples display a 90.95% increase in tensile strength, a 38.01% increase in hardness and a 71.5% decrease in corrosion rate in an HCl environment, along with a 46.7% decrease in a NaCl environment. Furthermore, there is a 207.7% increase in impact strength in the sample reinforced with 20 wt.% of seashell ash. Overall, the AA-SS composite with 20% wt. seashell ash exhibits the most favourable properties, featuring a 90.95% increase in tensile strength, a 38.01% increase in hardness and a lower corrosion rate when compared to the control sample.
Gender Discrimination and Performance of Female Employees in Selected Private Universities in Ado/Odo Ota Local Government area, Ogun state, Nigeria
(Bells University of Technology, 2024-08-06) ONWUEGBUNA, Godness Nneoma; Dr onifade, T.A.
This study examined the impact of gender discrimination on performance of female employees in selected private universities in Ado/Odo Ota local government area of Ogun state. Specifically, the study examined the influence of discrimination in managerial roles on the performance (task performance) of female employees in selected private Universities. To achieve the stated research objectives, a quantitative survey research design was adopted as a research objective, a quantitative survey research design was adopted as a research design, and a 25-item structured questionnaire was used as the research instrument for data collcetion. The target population comprised of 404 female employees of selected private universities in Ado/Odo Ota local government area. The sample size of 200 females was determined using taro Yamane formula. The collected data were analyzed with descriptive statistics (Mean and Grand mean) and inferential statistics (Simple Linear Regression).