Browsing by Author "Ewa, I.I."

Now showing 1 - 11 of 11
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    Ab-Initio Quantum Calculations of Some Molecular and Physical Properties of Alamine-Templated Gold Metal Nanoclusters for Application in Biosensing
    (Department of Physics, Nasarawa State University Keffi, 2020-09-11) Nafiu, S.A.; Lumbi, W.L.; Ewa, I.I.; Gurku, U.M.
    Alamine derived nanoclusters with Gold carriers for Biosensing are studied using ab-initio Quantum Chemical calculations. Density functional computations at the Becke3LYP (B3LYP) are arrived at with the aid of LANDL2DZ basis set. The molecular structure, dipole moment, quadrupole moment, charge transfer, polarizability and energy are studied. The Alamine DNA basis shows that the properties of pure Alamine are greatly influenced with the addition of Gold nanoclusters. The computed dipole moments are high showing that the nanocluster molecules are polar and the charge distribution is not symmetrical. The quadrupole moment showed that the molecules are a bit elongated along the ZZ axis. The total energies indicate that the Alamine molecules are slightly more stable with increase in the number of Alamine segments in the Gold four chains.
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    Complete Einstein’s Equations of Motion for Test Particles Exterior to Spherical Massive Bodies using a Varying Potential
    (Department of Physics, Nasarawa State University Keffi, 2021-04-07) Maisalatee, A.U.; Azos, M.M.; Ewa, I.I.
    In this article, a generalized varying gravitational scalar potential was used to completely define the metric tensors and coefficients of affine connections for spherical massive bodies whose tensor field varies with time, radial distance and polar angle. The completely defined metric tensors and coefficients of affine connections were used to study Einstein’s equations of motion for test particles within this field. The results obtained to the limit of c0 reduced to the corresponding Schwarzchild equations and to the limit of c2 , it contained additional terms not found in Schwarzchild equations which can be used in the study of blackhole and gravitational wave in this field and other astrophysical phenomena.
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    COMPUTATION OF ELECTRONIC STRUCTURE OF AN ATOM IN THE HARTREE-FOCK APPROXMATION
    (Department of Physics, Nasarawa State University Keffi, 2016-08-28) Anyanninuola, O.S.; Ewa, I.I.; Umar, I.; Liman, M.S.
    In this work, FORTTRAN program has been applied to evaluate the energy level of generally small atomic systems. The program was specifically directed to compute the Hartree-Fock equations. The ground state structures of small atomic systems are obtained using Hartree-Fock approximation. The total energies calculated for each of the state (1s, 2s, 2p) approximately agreed with those of experimental results as compared. Due to non-linearities introduced by Hartree-Fock approximation, the equations are solved using non-linear method such as iteration. The physical implication of this important finding has helped to identified clearly the parameter space accessible to the Hartree-Fock method.
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    DESIGN AND CONSTRUCTION OF A TWO AXIS SOLAR MAXIMUM POWER POINT TRACKING USING PIC16F877A MICRCONTROLLER BASED SYSTEM
    (Department of Physics, Nasarawa State University Keffi, 2016-09-01) Loko, A.Z.; Bugaji, A.I.; Ewa, I.I.; Ibrahim, Umar; Kwaha, B.J.
    Today, most of the streetlights in Nigeria use solar energy to operate; however, streets and road within cities of Nigeria experience street black out as night goes by due to minimum power tracking of sunlight during the day time thereby resulting to low or slow charging of backup systems (battery). Consequently, this research focus on the design and implementation of a maximum power tracking using the PIC16F877A microcontroller and dc motors for two dimensional sun tracking under different temperature, humidity and irradiation and extract maximum available power from photovoltaic (PV) panel that would serve as an alternative solution towards solving the issue of street blackout. This paper also covers the designing and construction of the Solar Tracking mechanical structure together with the associated electronic circuits and two DC motors. One DC motors is mounted to control the rotation part, while the second one is to control the tilting part. Four pairs of Light sensors Cadmium sulphide (CdS) were installed for detecting the light source position. The PIC16F877A is programmed using C language in microC PRO for PIC. The sensor values, temperature of the day are transmitted to the PC for monitoring purpose. A working system was finally demonstrated to validate the design.
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    DFT COMPUTATIONS OF SOME MOLECULAR AND PHYSICAL PROPERTIES OF GLUTAMINE-TEMPLATED NOBLE METAL NANOCLUSTERS FOR APPLICATION IN BIOSENSING
    (Department of Physics, Nasarawa State University Keffi, 2020-09-05) Nafiu, S.A.; Lumbi, W.L.; Ewa, I.I.; Gurku, U.M.
    The molecular geometry of Glutamine derived nanoclusters with Gold carriers for Biosensing are studied using abinitio Quantum Chemical calculations. Density functional calculations at the Becke3LYP (B3LYP) are carried out using LANDL2DZ basis set. The molecular structure, dipole moment, quadrupole moment, charge transfer, polarizability and energy are studied. It is predicted that the properties of pure Glutamine are affected when attached with Gold nanoclusters. The predicted dipole moment is high indicating that the nanocluster molecules are polar and the charge distribution is not symmetrical. The quadrupole moment predicts that the molecules are slightly elongated along the ZZ axis. Using the total energies, it is predicted that the Glutamine molecules are slightly more unstable with increase in the molecular size.
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    Environmental Sustainability through Non-destructive Core Testing for Petroleum Reservoir Characterisation
    (Department of Physics, Nasarawa State University Keffi, 2013-01-10) Woma, Yakubu Timothy; Ewa, I.I.; Amaitem, Iseh J.
    There is growth in environmental concern associated with increase in petroleum production as energy demand continues to increase. Reduction in each of the several inter-related activities of petroleum production will ultimately lead to environmental sustainability. Conventional core testing is expensive, has little regards for environmental concern and is not based on geological, statistical and petrophysical criteria. Probe permeability and magnetic susceptibility measurements correlates well with conventional core testing results, and are possible ways to reduce environmental impact petroleum reservoir characterization
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    Generalization of Quantum Mechanical Wave Equation in Spherical Coordinate Using Great Metric Tensors and a Variable Gravitational Scalar Potential
    (Department of Physics, Nasarawa State University Keffi, 2020-07-30) Maisalatee, A.U.; Lumbi, W.L.; Ewa, I.I.; Mohammed, M.; Kaika, Y.K.
    In this research work, the Riemannian Laplacian operator for a spherical system which varies with time, radial distance and time was obtained using the great metric tensors and a varying gravitational scalar potential. Furthermore the obtained Laplacian operator was used to obtain the generalized quantum mechanical wave equation for particles within this field. The Laplacian operator obtained in this work reduces to the well known Laplacian operator in the limit of c0 , and it contained post Euclid or pure Riemannian correction terms of all orders of c2 . Also the generalized quantum mechanical wave equation obtained, in the limit of c0 reduces to the well known Schrodinger mechanical wave equation, and in the limit of c2 contained additional correction terms not found in the well known Schrodinger wave equation. Hence the results in this work satisfy the Principle of Equivalence in Physics.
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    Gravitomagnetic Coupling in a Weak Field Approximation
    (Department of Physics, Nasarawa State University Keffi, 2019-06-12) Sarki, M.U.; Ewa, I.I.; Mustapha, I.M.; Yusuf, M.A.; Isah, S.H.
    According to general relativity, a moving or rotating matter should produce contribution to the gravitational field which is in analogy to the magnetic field of a moving charge or magnetic dipole; we can thus express the general relativity in a Maxwellian structure with the existence of single operator for both fields. In this research work, we studied the coupling of Maxwell's dynamical theory of electromagnetism in a non-static gravitational field by applying an obtained gravitational scalar potential to the Riemann's laplacian operator. In the limit of weak gravitation, we obtained the dynamical gravitomagnetic scalar potential across the fields. While in the boundary conditions the results are generalized gravitomagnetic potential. our results will thus widen the scope into study of gravitomagnetic coupling.
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    Gravitomagnetism, Coupling, Scalar Potential, Vector potential, Riemann’s Laplacian Operator
    (Department of Physics, Nasarawa State University Keffi, 2018-12-10) Lumbi, W.L.; Uchenna, E.T.; Ewa, I.I.; Loko, A.Z.; Ndikilar, Chifu E.
    In this article, the generalized Schwarzschild metric for time varying spherical fields is used to derive equations of motion for test particles in the vicinity of a time varying spherical mass. A generalized gravitational scalar potential is expanded and used to construct equations of motion for test particles exterior to a time varying spherical distribution of mass. The world line element at the equatorial plane of a spherical massive body was constructed. This was used to study the motion of photons. The equations of motion obtained have additional terms not found in equivalent equations in the Schwarzschild’s field. These are uncovered for theoretical and astrophysical development and applications. Remarkably, when the time varying scalar gravitational potential reduces to that of a static field, results obtained in Schwarzschild's field are obtained. Thus, our generalization is mathematically satisfactory and has astrophysical implications for the study of time varying spherical gravitational fields.
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    Quantum Energy of a Particle in a Finite-potential Well Based Upon Golden Metric Tensor
    (Department of Physics, Nasarawa State University Keffi, 2019-07-18) Ewa, I.I.; Howusu, S.X.K.; Lumbi, W.L.
    In our previous work titled “Riemannian Quantum Theory of a Particle in a Finite-Potential Well", we constructed the Riemannian Laplacian operator and used it to obtain the Riemannian Schrodinger equation for a particle in a finite-potential well. In this work, we solved the golden Riemannian Schrodinger equation analytically to obtain the particle energy. The solution resulted in two expressions for the energy of a particle in a finite-potential well. One of the expressions is for the odd energy levels while the other is for the even energy levels.
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    Riemannian Quantum Theory of a Particle in a Finite-Potential Well
    (Department of Physics, Nasarawa State University Keffi, 2018-12-14) Ewa, I.I.; Lumbi, W.L.; Howusu, S.X.K.
    In this article, the golden Riemannian Laplacian operator was constructed using the golden metric tensor in spherical polar coordinate and was applied to the Schrodinger wave equation in order to obtain the golden Riemannian Schrodinger equation for a particle in a finite-potential well. The results are that the golden Riemannian Laplacian operator and golden Riemannian Schrodinger equation were augmented with additional correction terms; which are not found in the existing equations and can be applied to a finite-potential well problem, so as to obtain the expression for the allowed energy values