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- ItemTitus Taofk Ogunseye, Godwin Babatunde Egbeyale, Adekunle K. Bello, Adegbenro S. Ajani(Open Journal of Applied Sciences, 2022-12-03) Design and Construction of a Microcontroller Based Electronic Moving Message DisplayLED-based moving-message displays are becoming appreciated among the general public for transmitting information to groups of people quickly. This work presents a simple design and implementation of a microcontroller-based electronic moving message display system. The design involves the arrangement of Light Emitting Diodes (LEDs) and the programming of a microcontroller that controls and determines the pattern and session of the display. The implementation of a moving message displays a text containing 22 characters (i.e. WELCOME TO DEPT. OF PHYSICS). The electronic message display helps to pass information, educates, enlightens, facilitates commercial activities through the advertisement and marketing of goods and services, description of places, etc. The ease in which it displays information makes it a veritable, suitable, and excellent tool for passing information fast and pleasurable to the public. Furthermore, it enhances the response to information in an attractive way and manner in which it displays messages. The microcontroller used in this work is the PIC16F84A. It belongs to a class of 8-bit microcontrollers of RISC (reduced instructions set) architecture. Its output controls the switching of the relays through a transistor switching stage that switches its socket. The LED matrix (array) is arranged in parallel and soldered to a Vero board with the microcontroller and other electronic components, such as resistors, capacitors, transistors, relays, LEDs, diodes, and transformers. In view, this work served as a means of digging into the technology involved in the use of a microcontroller and some other basic electronic components and enhanced visualization of message display.
- ItemDevelopment of a mobile multimodal biosignal instrument for simultaneous measurement and analysis of four clinically relevant biosignals, obtained from both normal and pathological subjects(International Journal of Biosensors & Bioelectronics, 2018-04-18) Adegbenro Sunday Ajani, Olusope Michael Alade, Oluwatayo Sandra Ajani, Oladosu Jamiu AlabiThis paper presents the development and construction of a multimodal biosignal instrument to monitor and analyse simultaneously for clinically relevant biosignals, obtained from both normal and pathological subjects. Biosignals were tapped from the appropriate locations of subjects’ bodies and buffered by operational amplifiers through disposable electrodes. This was directly followed by pre-processing the generated signals, feeding their outputs into an analogue to digital converter (ADC) input of 40PIC18F4450 self programmed microcontroller, and then fed into ADS1299 amplifier with supporting logics 74HC14 and HEF4050 respectively. The signals obtained were transmitted through 869.95 MHz frequency modulation transmitter with an improvised whip antenna, to stationary end consisting of FM receiver circuit connected to a 64 bit 4G RAM Computer, through a USB COM Port.
- ItemEgbeyale G. B., Ogunseye T. T., Ajani A. S., Bello A. K., OyeroP. O. and Odeyem C. S(IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG), 2022-08-06) Data Acquisation and Interpretation of Hydrogeological Survey in Parts of MALETE, Southwestern NigeriaThis study was carried out to acquire hydro-geophysical data and provide detailed interpretation of the data in parts of Malete, Moro local government, Kwara State, Nigeria. The geographical coordinates of the study area are longitude 8˚ 42’ 0” East and Latitude 4˚ 28’ 0” North. A total of 16 Vertical Electrical Soundings were carried/ estimated out across three profiles using the Schlumberger electrode array configuration, with current electrode separation (AB/2) varying from 1m to 80 m. The data obtained were subjected to interpretation by partial curve matching and then by computer iteration. The interpretation of the VES data also assisted in the characterization of three to four geo-electric layers from which the aquifer unit was delineated. The layers are divided into Topsoil, Laterites, weathered basement and Fresh bed rock. The weathered and fractured basements are the aquifer unit delineated across the area. The thickness of the weathered basement unit varies from 10.1m to 38.3m in the area.
- ItemRadiological Impact Assessment of Activity Concentrations in Soil Samples of Selected Region of Kwara State Nigeria(International Journal of Science and Research, 2022-03-09) OYERO O. P., AJANI A. S., and AINA A. O.The soil, being a natural source of radiation consists of 238U, 232Th and 40K radionuclides which at elevated levels can pose a radiological health concern to humans as man is continuously exposed to radiation in the environment. Studies on soil activity levels and radionuclide distributions in selected region of Kwara state were carried out to provide a baseline data on gamma radiation due to soil samples. Following standard procedures, Gamma spectroscopy measurements were performed on a total of sixty four (64) collected soil samples from sixteen (16) selected regions using a high-resolution NaI(Ti) detector. Activity concentrations of 238U and 232Th vary from 1.76±1.5 to 16.25±2.1 below 35Bq/kg world limit at ASD location and 2.98±4.8 to 33.9±3.8 below 30 Bq/kg world limit at TK location. The activity of 40K was found significantly higher than 400 Bq/kg limit in 14 sampling regions. From gamma spectroscopy results, radiological hazard indices were estimated to assess the safety of the residents of the study area. In all locations, external and internal hazard indices revealed values significantly lower than “unity” which is the limit set by International Commission on Radiation Protection (ICRP). The average values for annual effective dose falls below 1 mSv/yr limit set by (ICRP). Excess lifetime cancer risk (ELCR) estimated in TK location only showed value (0.4050 ×10-3) higher than the world average(0.29 × 10-3). Overall, average ELCR (0.2564 ×10-3) value in the study area falls below the world average value. This implies that cancer risk of one member of the public in the study area over a 70 years lifetime is high.
- ItemSynthesis, Characterization, and Optoelectronic Properties of Zinc Oxide Nanoparticles: a Precursor as Electron Transport Layer(Heliyon, 2024-05-15) Sunday Wilson Balogun, Hakeem Olayinka Oyeshola, Adegbenro Sunday Ajani, Olusola Oladele James, Mojoyinola Kofoworola Awodele, Hope Kofoworola Adewumi, George Atilade Àlàgbé, Olusegun Olabisi, Opeyemi Samson Akanbi, Festus Akintunde Ojeniyi, Yekinni Kolawole SanusiThis experimental study examines and reports the result of synthesis, characterization, and optoelectronic properties of zinc oxide nanoparticles a precursor as electron acceptor. Zinc oxide nanoparticles was synthesized using extract from cordyline fruticosa plant (c f) to act as electron acceptor to address the issue of recombination of electron-hole pair; a flaw associated with photovoltaic cells and polymer solar cells. A clean, credible, economical, and environmentally friendly alternative method to mitigate this undesirable effect is being sought for by introduction of electron transport layer. synthesized ZnONPs were characterized by UV-Visible spectroscopy (UV-Vis), X-Ray diffraction (XRD), scanning electron spectroscopy (SEM) with Electron Dispersive X-ray (EDX). Transmission electron microscopy (TEM), Fourier transform infra- red microscopy (FT-IR), and Four Point probe equipped with Keithley 2400 SMU. The results showed optical band gap energy of 3.58 eV. XRD revealed synthesized nanoparticles wurtize hexagonal shape and crystallinity. SEM and TEM images shows gain size in nanometer range. EDX analysis showed elemental composition of the atomic and weight percentage of ZnONPs. Electrical properties showed sheet resistance (RS) of 4349.03 Ω., resistivity (ρ) 110.47 Ω-m and conductivity (σ) 9.1 Sm-1. The result indicated electrical conductivity of ZnO has been improved by cordyline fruticose extract. This implies the properties of pure ZnO can be tuned or controlled by plant extract to reduce the electron recombination rate by injection of photo excited electron into the conduction band resulting in the production of ZnONPS which increases electron mobility. Thereby enhances the solar cell performance. The reported results are promising for potential application of ZnONPs as electron transport layer.