Browsing by Author "Oyero O P"

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    Effect of Prenatal Exposure to Electromagnetic (2.45 GHz) Radiation on Liver Organ of Albino Rat’s Offspring
    (Adeleke University journal of science, 2025-06) Oyero O P; Amuda D B; Adeleke D K; Ajani Adegbenro Sunday; Aremu A A; Egbeyale Godwin B; Oyero A B; Oni A A
    This study was aimed to examine the effect of 2.45 GHz radiofrequency radiation prenatal exposure on the liver of first filial generation (F1) of albino rats. Two specially designed electromagnetic field cages containing three (3) pregnant rats each were marked as experimental exposed group (EEG) and control unexposed group (CUG) in this study. A portable radio picostation of RF up to 2.45 GHz with Ubiquitous Network, USA, with its integrated omnidirectional antenna was placed inside the EEG cage at 15 cm proximity to the pregnant rats to serve as RF radiation source. Pregnant rats in CUG cage were kept unexposed. Radiofrequency radiation exposure was performed on pregnant rats in the EEG cage for 1 hour everyday between 13th to 21st day of gestation. Power density of 0.066 W/m2 (5 V/m) was maintained during the period of exposure. After parturition, two new groups namely New-EEG and New-CUG were established from pups obtained from EEG and CUG respectively. Male rat pups from New-EEG and New-CUG were sacrificed on 50th day postnatal and their livers were harvested for histological examination. Result from the photomicrograph revealed degenerated liver in New EEG characterized by a mild loss of liver parenchyma, some mild derangement in the cellular profiles, severe hemorrhage and presence of inflammatory red cells within and around the central vein including the sinusoids as against New-CUG. Result of this study showed that RF radiation prenatal exposure caused morphological changes in the liver of F1 generation of albino rats.
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    EXPERIMENTAL MEASUREMENT OF SIGNALS ATTENUATION OF SOBI FM AT VHF ALONG ILORIN - JEBBA ROAD, NIGERIA.
    (NJP, 2023) Ajani Adegbenro Sunday; Egbeyale Godwin B; Yusuf O A; Aliu T O; Aremu O A; Odeyemi C S; Oyero O P
    The study of propagation loss and fade margin of 101.9MHz (Sobi FM) signals along Ilorin (Lat 80541 & Long 40551E) – Jebba (Lat 90111N & Long 40821E) road at very high frequency (VHF) band was done experimentally using spectrum analyzer. Alongside theoretical calculation to determine the attenuation was also done using Friis and Free Space attenuation equations. The attenuation and fade margin were measured regularly at intervals of two kilometers (2 km) from the base station up to a total of sixty kilometers (60 km) along the chosen axis. The analytical models were obtained in form of polynomial equations for received power, measured attenuation and the fade margin of the signals. The calculated results correlated with the measurements (Correlation coefficient value R2 = 1), but gave deviation when compared with the measurements. The variance of the results for the existing formula with the measurements was adjudged to hills, valleys, trees and bends along the links. The highest value of the fade margin obtained (75.89 dB) did not exceeded the receiver’s sensitivity of 80 dB, which implies that the radio-signals can be improved, by increasing the height and the power of transmitting antenna. This research provides information on improving Sobi FM transmission coverage and a guide to upgrade or redirect their transmission signals appropriately.