Physics and Material Science

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    Performance Evaluation of UHF Wireless Digital Gait Monitoring Instrumentation for Long Range Data Transmission
    (International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 2013-01-12) Michael Olusope Alade, Adegbenro Sunday Ajani
    This paper presents performance evaluation of a UHF wireless Gait monitoring instrumentation system for long distance. This improvised gait monitoring system consists of two basic units; a mobile transmitting unit sending signal at carrier frequency of 869.85 MHz and a stationary receiving unit placed at the base station. The system was implemented using flexi force sensor A201 connected with the aid of appropriate reference resistance to the operational amplifier LM324 whose outputs are fed into 40-pin 8-bit PIC16F877A microcontroller which is connected to the TX3B, 869.85MHz transmitter connected to micro whip antenna and the receive unit which consists of micro whip antenna connected to 869.85MHz RX3A receiver which is connected trough RS-232 line driver to a Laptop computer. Visual C++ computer programming languages were written to run the various processing stages of the signal received. The performance of the system was tested with a number of pathological patients in relative with normal subjects in form of graphical analysis of the data obtained at various intervals of time. The comparison of range of data transmission obtained with the existing ones shows good agreement. The device is highly recommended for applications where quantitative gait measurements are the optimum requirement, especially in situations where long range data transmission is highly desired.
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    Solutions of the Dirac equation with the shifted Deng Fan potential including Yukawa-like tensor interaction
    (2013-09) Yahya, W.A.; Falaye, B. J.; Oluwadare, O. J; Oyewumi, K.J
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    κ state solutions for the fermionic massive spin-½ particles interacting with double ring-shaped Kratzer and oscillator potentials
    (2014-04-12) K. J. Oyewumi; B. J. Falaye; C. A. Onate; O. J. Oluwadare; W. A. Yahya
    In recent years, an extensive survey on various wave equations of relativistic quantum mechanics with different types of potential interactions has been a line of great interest. In this regime, special attention has been given to the Dirac equation because the spin-½ fermions represent the most frequent building blocks of the molecules and atoms. Motivated by the considerable interest in this equation and its relativistic symmetries (spin and pseudospin), in the presence of solvable potential model, we attempt to obtain the relativistic bound states solution of the Dirac equation with double ring-shaped Kratzer and oscillator potentials under the condition of spin and pseudospin symmetries. The solutions are reported for arbitrary quantum number in a compact form. The analytic bound state energy eigenvalues and the associated upper- and lower-spinor components of two Dirac particles have been found. Several typical numerical results of the relativistic eigenenergies have also been presented. We found that the existence or absence of the ring shaped potential has strong effects on the eigenstates of the Kratzer and oscillator particles, with a wide band spectrum except for the pseudospin-oscillator particles, where there exist a narrow band gap.
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    Nonrelativistic and relativistic bound state solutions of the molecular Tietz potential via the improved asymptotic iteration method
    (2014-04-14) W.A. Yahya; K. Issa; B.J. Falaye; K.J. Oyewumi
    We have obtained the approximate analytical solutions of the relativistic and nonrelativistic molecular Tietz potential using the improved asymptotic iteration method. By approximating the centrifugal term through the Greene–Aldrich approximation scheme, we have obtained the energy eigenvalues and wave functions for all orbital quantum numbers [Formula: see text]. Where necessary, we made comparison with the result obtained previously in the literature. The relative closeness of the two results reveal the accuracy of the method presented in this study. We proceed further to obtain the rotational-vibrational energy spectrum for some diatomic molecules. These molecules are CO, HCl, H2, and LiH. We have also obtained the relativistic bound state solution of the Klein−Gordon equation with this potential. In the nonrelativistic limits, our result converges to that of the Schrödinger system.
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    Thermodynamic properties and the approximate solutions of the Schrödinger equation with the shifted Deng–Fan potential model
    (2014-05) Oyewumi, K. J.; Falaye, B. J.; Onate, C.; Oluwadare, O. J.; Yahya, W. A.
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    Position and momentum information‐theoretic measures of the pseudoharmonic potential
    (2015-04-14) W. A. Yahya; K. J. Oyewumi; K. D. Sen
    In this study, the information‐theoretic measures in both the position and momentum spaces for the pseudoharmonic potential using Fisher information, Shannon entropy, Renyi entropy, Tsallis entropy, and Onicescu information energy are investigated analytically and numerically. The results obtained are applied to some diatomic molecules. The Renyi and Tsallis entropies are analytically obtained in position space using Srivastava–Niukkanen linearization formula in terms of the Lauricella hypergeometric function. Also, they are obtained in the momentum space in terms of the multivariate Bell polynomials of Combinatorics. We observed that the Fisher information increases with n in both the position and momentum spaces, but decreases with for all the diatomic molecules considered. The Shannon entropy also increases with increasing n in the position space and decreases with increasing . The variations of the Renyi and Tsallis entropies with are also discussed. The exact and numerical values of the Onicescu information energy are also obtained, after which the ratio of information‐theoretic impetuses to lengths for Fisher, Shannon, and Renyi are obtained. © 2015 Wiley Periodicals, Inc.
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    Approximate Analytical Solutions of the Improved Tietz and Improved Rosen-Morse Potential Models
    (2015-06-12) Yahya Wasiu Akanni; Issa Kazeem
    In this article, the approximate analytical solutions of the improved Tietz and improved Rosen-Morse potential models are obtained using the parametric Nikiforov-Uvarov method. The energy eigenvalues and wave functions are obtained in the relativistic realm by solving the Klein-Gordon equation. Numerical results of the energy eigenvalues are obtained and studied.
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    Exact and Approximate Solutions of Some Potential Energy Functions for Diatomic Molecules
    (2015-07) Olufadi, Y.; Salami I.; Yahya, W. A.; Adelani, M.
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    Quantum information entropies for the $$\ell $$ ℓ -state Pöschl–Teller-type potential
    (2016-04-14) W. A. Yahya; K. J. Oyewumi; K. D. Sen
    In this study, we obtained the position–momentum uncertainties and some uncertainty relations for the Pöschl–Teller-type potential for any . The radial expectation values of r −2 , r 2 and p 2 are obtained from which the Heisenberg Uncertainty principle holds for the potential model under consideration. The Fisher information is then obtained and it is observed that the Fisher-information-based uncertainty relation and the Cramer–Rao inequality hold for this even power potential. Some numerical and graphical results are displayed.
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    Exploration for iron ore in Agbado-Okudu, Kogi State, Nigeria
    (2017-12-19) Nurudeen Kolawole Olasunkanmi; Olufemi S. Bamigboye; Adebayo Aina
    This report details the result of geophysical exploration for iron ore; which involved vertical magnetic intensity (∆Z) and gravity measurements, to delineate the geometry and depth extent of the deposit and acquiring quantitative and qualitative information for pre-drilling purposes in Agbado-Okudu. It is located about 3 km from Jakura along Lokoja-Jakura marble quarry and within low latitude precambrian basement complex district of Kogi State, Nigeria. A total of 517 magnetic measurement points along 16 traverses and 330 gravity reading along 11 profiles on the deposit in northeast–southwest azimuth were undertaken. The magnetic and gravity data enhancement involved linear regression curve fitting and fast Fourier transform, which were used to construct residual magnetic (RM) and gravity (RG) anomalies, analytic signal amplitude, Euler deconvolution at varying spectral indices (SI), power spectrum, and source parameter image (SPI), using the submenu of Geosoft Oasis Montaj software. Interpretation of the RM and RG anomalies revealed a primary causative body which perfectly correlates the positive anomalies and iron ore deposit, in form of a horizontal or gently dipping dyke with strike length of 600 m and average width of 110–130 m, within the gneiss complex in the north and trending south of the area. A secondary causative body associated with the negative anomalies and inferred as a vertical/near vertical thin sheet striking northeast–southwest coincided with the granitic and quartzitic intrusion. The NW–SE and E–W lineament trend conformed Kibarian and Liberian orogeny cycles of generally known structural trends in Nigeria, which shows that the iron ore deposit is structurally controlled. Depths to sources were estimated within range ≤ 2–24 m and 37.5–60 m, regarded as shallow and relatively deep depths, respectively. Ten vertical boreholes ranging in depth between 50 and 100 m are recommended, five of which require a priority attention to ascertain the thickness of the primary causative body.
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    Comparison of double-folding effective interactions within the cluster model
    (2018) B. D. C. Kimene Kaya; S. M. Wyngaardt; T. T. Ibrahim; W. A. Yahya
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    Proposed Approach on Non Invasive Detection of Diabetes by Spectral Analysis of Absorbed, Reflected and Transmitted Light of Different Wavelengths by the Blood
    (American Research Journal of Biomedical Engineering, 2018-02-06) Olusoji Amos Ogunbode1, Adegbenro Sunday Ajani , Oluwatayo Sandra Ajani
    This investigation pinpoints the major requirements for the development of a clinically reliable devices for blood glucose monitoring. Noninvasive devices for blood glucose have been employed to monitoring blood glucose with the effort to give a better life to diabetic patients by developing easy blood glucose measurement instruments, with little fear of medical risk and mortality related to diabetes. Optically based methods for noninvasive approaches have provided great development to blood glucose monitoring. Various researchers and companies have designed and developed noninvasive blood glucose monitoring devices to detect diabetes, and this paper describes their working principles, importance and limitations, so as to give room for more comfortable designs. It is important to understand that noninvasive monitoring will never be achieved without good calibration approach. At this point, we are far away from reaching the aim of noninvasive blood glucose measurement, with many technical problems yet to be resolved.
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    Development 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 Alabi
    This 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.
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    Analysis of human biosignal information with developed application software for ECG, EMG, EEG and speech signals
    (International Journal of Biosensors & Bioelectronics, 2018-06) Ajani Adegbenro Sunday, Olusope Micheal Alade, Oluwatayo Sandra Ajani, Oladosu Jamiu Alabi
    This paper repots the development of a flexible, robust and user friendly application software for the analysis of human biosignal information. Biosignals are time-varying electrical signals observed in living beings, which can be continually monitored for clinical diagnoses with suitable software. For this research, application softwares for biosignal information were developed with C programming language on MPLAB 4000 ICE. Codes for the analysis and graphical interface session were written using MATLAB 2013a. The programmes were compiled; the system encased and tested successfully with 10 patients per hospital, at five University Teaching Hospitals in South Western Nigeria and development of robust and flexible application software for the analysis of biosignal data was also achieved.
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    EMPIRICAL CHARACTERIZATION AND MODELING OF FADE DEPTH DUE TO MULTIPATH PROPAGATION AT MICROWAVE BAND
    (Global Scientific Journals (GSJ), 2018-06-03) Aremu Olaosebikan Akanni, Ajani Adegbenro Sunday, Anie Nicholas Oliseloke, Akanbi Raymond Adebowale
    In communication system, signal propagates from the base station to the receiver as multitude of partial waves from different directions known as multipath propagation. This effect gives rise to fading of radio signal as the received signal strength decreases. In this work, fade depth, at microwave band signals is estimated and modeled based on the effect of secondary radio parameters such as geoclimatic factor, tropospheric radio reflectivity and refractivity gradient in the year 2017 in Ibadan, south western, Nigeria. The secondary radio parameters were obtained from temperature, relative humidity and atmospheric pressure. The values of point refractivity gradient obtained were used to figure out the geoclimatic factor, K. The results obtained shows monthly and seasonal radio refractivity gradient and geoclimatic factor K and the results affirmed that the geoclimatic factor K is region based. The percentage of time at a given fade depth is exceeded as a single frequency increases rapidly with increasing path length. Based on the geoclimatic factor obtained, the work proposes a general model power1 multipath fading adapted to a link distance at fixed frequency 12.5 GHz and multipath fading model as a function of frequencies at a fixed link distance.