Communities in DSpace
Select a community to browse its collections.
Recent Submissions
Item
A Systematic Review of Nigerian Articles in Radio Research
(Online Journal of Arts, Management and Social Sciences (OJAMSS), 2023-06) Ifeduba, Emmanuel
It is impossible to exaggerate the value of radio in developing nations like Nigeria. It has been essential to national, societal, and educational development. Radio is the most prevalent, accessible, and inexpensive mass media available, especially for rural residents, despite technological breakthroughs that have altered how society functions.This paper examines the research conducted by researchers in Nigeria how radio relates with other aspects of life. The objective of the study was to find out the different areas of research that researchers have covered with in radio research as a medium of mass communication, the research methodology and the theory most preferred by researchers. The study utilized the systematic review and content analysis as methodology for the study. Findings revealed that researchers have focused more on relating radio and health, development, agriculture, education, politics and advertising. The study recommended that researchers should diversify and research on radio and other areas like culture, economy, convergence of the media, sports, climate change etc
Item
Influence of State Control on Media Operations in Nigeria
(RUN Contemporary Journal of Politics and Administration, 2023) Ifeduba, Emmanuel
The mass media in every state is a reflection of the system of governance in such state. However, some governments exercise total control on the media, using tools such as repressive laws and policies amongst others. This paper focused on the instruments of direct state control on the media by the government and its influence on media economics in Nigeria. Deregulation of the broadcast industry, repressive laws, and policies were identified as factors that led to either the sanctioning, fining or closure of some media organisations in recent times. It was concluded that direct control of the press by the government in power can influence media economics as the press becomes dependent on media owners and can be affected when there is an existing policy that places a barrier on profit making. The implication is that the demand and supply of news is greatly affected, portraying news as a commodity that could be bought.
Item
Effect of SiC addition on Laser‑based CoNi Binary Alloy Coatings on Ti‑6Al‑4V alloy
(Springer, 2024-04-25) Adesina, Olanrewaju
This research explores the impact of variations in laser scanning speed and the incorporation levels of SiC-Ni-Co powders
on Ti-6Al-4V alloy using laser surface cladding technique. Key parameters, including a consistent laser power of 700 W,
a 4 mm beam spot size, a powder feed rate of 1.0 g/min, and a gas fow rate of 3 L/min, along with fxed powder composi tions, were maintained. The laser scanning speeds were adjusted to 0.4 m/min, 0.8 m/min, and 1.2 m/min. Microstructural
analyses were carried out using scanning electron microscopy (SEM) while Vickers microhardness was employed to assess
coating hardness, and corrosion properties were evaluated using a linear potentiodynamic polarization technique. Follow ing the corrosion attack, the protective oxides formed were identifed through SEM and X-ray difractometer (XRD). The
results revealed a strong metallurgical relationship between the clad layer and the substrate, demonstrating the efectiveness
of the laser-clad technique. Particularly, the highest laser scan speed exhibited the most signifcant improvements in hardness
and corrosion resistance. The coatings displayed an average hardness value of 1269.20 HV0.1, a notable fourfold increase
compared to the substrate's value of 334 HV0.1. Concerning corrosion, a clear correlation emerged between scan speed and
polarization resistance, confrming that higher scan speeds could lead to enhanced polarization resistance
Item
Optimization and Inhibitive effects of Sweet Potato Leaf Extract (SPLE) on mild steel
(Elsevier, 2023-02-02) Adesina, Olanrewaju
Weight loss and electrochemical techniques were used to evaluate the inhibition efficiency of
sweet potato leaf extracts (SPLE) as inhibitor on mild steel in phosphoric acid. Box Behnken
design was used to examine the interactions of these variables: acid concentration (0.5–1.5 M);
time (5–10 days); inhibitor concentrations (0.3–0.9 g/L) and temperature (30–60
◦ C) respectively. Polarization and Electrochemical impedance and were used to measure the inhibition
efficiency. The surface morphology of coupons was analysed using Scanning Electron Microscope
(SEM). The experimental data was statistically analysed and regression equation was generated
for inhibition efficiency. The weight loss measurement revealed that extract acts as an inhibitor
for mild steel in phosphoric acid and decreases rate of corrosion. The results of inhibition effi
ciency derived from polarization studies and impedance analyses agree. The validated experi
ment’s coupon created a better protected inhibitive layer than coupon of the best process level as
observed from experimental design, according to SEM analysis. It can be concluded that the
extract operated as an inhibitor by producing outer film on the surface of mild steel.
Item
Development of Sacrificial Anode from Al, Mg, and Ti from Iron Ore Tailings
(Taylor & Francis Group, 2024-03-07) Adesina, Olanrewaju
This investigation used aluminium, magnesium, iron ore tailings, and low-carbon steel. Iron ore
tailings (5–30 wt% Mg and 50 μm in size) in an aluminium matrix formed the anode. In 0.5 M
NaCl solution, the weight loss, corrosion rate, and electrochemical properties were measured.
Samples A to E have corrosion rates of 0.43, 0.28, 0.36, 0.08, and 0.11 mm/yr, respectively. SEM/
EDS examination revealed the presence of elemental Al, Mg, O, and Si in the anode. The XRD
patterns indicate intermetallic compounds such as iron nitride (Fe3N), aluminium silver (Ag-Al),
and manganese zirconium (Mn2Zr). In samples A, B, and C, Al and Mg formed a protective
coating on the anode, while C and Si reduced passivation and released electrons to protect the
steel. IOTs and Mg in the aluminium matrix improve the anodic corrosion resistance. The
observed improvements in corrosion resistance highlight the potential of these sacrificial
anodes for practical applications in corrosion protection systems