Browsing by Author "Anyanninuola, O.S."

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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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    Effects of Near-Surface Air Temperature on Sub-Surface Geothermal Gradient and Heat Flow in Bornu-Chad Basin, Nigeria
    (Department of physics, Nasarawa State Univesity Keffi, 2021-04-01) Tyor, Andrew A.; Uko, Etim D.; Anyanninuola, O.S.; Onengiyeofori, A.
    A study of the effect of near-surface temperature on fields of subsurface geothermal gradient and heat flow has been carried out in the Bornu-Chad Basin, Nigeria, using corrected Bottom-Hole Temperatures (BHTc) lithologic-log data from 9 oil wells. The geothermal gradient using only BHTs ranges from 15.9oCkm-1 to 38.2oCkm-1 with an average of 26.9+/-3.5oCkm-1, while that computed with mean annual temperature and BHTs ranges from 28.2oCkm-1 to 51.5oCkm-1with an average of 37.5+/-2.5oCkm-1. The geothermal gradient using the mean annual temperature and BHTs in the Bornu-Chad is higher than using only BHTs by 7.0oCkm-1. Heatflow ranges from a minimum of 61 mWm-2 to a maximum of 114mWm-2 with an average of 68+/-5.89mWm-2. The isotherm maps exhibit an increasing SW-NE trend. An average heat flow of 68+/-5.9mWm-2 deduced from Bornu-Chad basin is normal for a continental passive margin with age of about 100My. Geothermal gradient results show a distinct and direct relationship with nearsurface conditions. There are indications that surface heat flow is controlled by lithology, geothermal gradient and near-surface solar radiation conditions in the Bornu-Chad basin. Consequently, it is recommended that the mean surface temperature be used in geothermal gradients and heatflows estimations. The knowledge of geothermal properties is very important in the search for geothermal energy in the area of study.
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    ESTIMATION OF MAGNETIC DEPTH TO SOURCE USING HIGH RESOLUTION OF AEROMAGNETIC DATA OF PARTS OF UPPER BENUE TROUGH, NORTH EASTERN NIGERIA
    (Department of physics, Nasarawa State Univesity Keffi, 2018-06-05) Sawuta, J.M.; Anyanninuola, O.S.; Udensil, E.E.; Ogwola, P.
    A detailed quantitative interpretation of high resolution aeromagnetic data covering latitude 9.0oN – 10.0oN and longitude 11.0oE – 12.0oE with a total area of 12,100km2 which corresponds to parts of upper Benue Trough (Kaltungo, Guyok, Lau and Dong) Northeast, Nigeria has been carried out using Source Parameter Imaging (SPI) and Standard Euler Deconvolution methods for the purpose of estimating the sedimentary thickness of the study area for hydrocarbon maturation or accumulation. The polynomial fitting with order one method was applied in the regional–residual separation. Further analysis was conducted on the residual map. The SPI results revealed a maximum sedimentary thickness of 4908.178m while Standard Euler Deconvolution results also revealed a depth of 4050.1 m. Therefore, the highest sedimentary thickness of the study was found around Wafango, Dong and Lau region of the study area with shallow thickness of 741.108m to 1162.154m around Biliri, Tula and Kaltungo down to Lankoviri in Southern region of the study area. Consequently, the highest sedimentary thickness of about 4908.17 m from SPI and 4050.1 m from Standard Euler deconvolution is sufficient enough for hydrocarbon maturation or accumulation. These areas with maximum sedimentary thickness may be subjected for further geophysical investigation like seismic reflection/refraction, so as to affirm its hydrocarbon potential
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    Estimation of The Structural Pattern and Sedimentary Thickness Over Part Of Anambra Basin, Nigeria Using Aeromagnetic Data
    (Department of physics, Nasarawa State Univesity Keffi, 2021-02-02) Ikiola, Priscilla E.; Ofoegbu, Charles O.; Uko, Etim D.; Anyanninuola, O.S.
    Aeromagnetic data acquired over part of the Anambra Basin is analyzed to determine the structural pattern and sedimentary thickness of the basin. The study area is covered by high resolution aeromagnetic data on sheets 301 (Udi), 302 (Nkalagu), 312 (Okigwe) and 313 (Afikpo), and lies between latitudes 5o30'0''-6o30'0'' and longitudes 7o0'0"-8o0'0". The whole area was divided into 25 overlapping blocks of 37.2km2 each and a 2D energy spectral analysis was carried out. Total magnetic intensity data was subjected to filtering and analytical techniques to determine the structural pattern, mineralization potential, depth to the basement, variation in the sedimentary thickness. The structural map generated using the vertical derivatives shows that the major structural orientation of the area is in the ENE-WSW trend and the minor trend is the NW to SE direction widespread all over the area. These structures are as a result of the various near-surface magnetic intrusion within the study area. The spectral analysis result shows two depth layers, the deep and the shallow depth, the depth to magnetic basement for the deep anomalous source ranges from 3.3km to 4.84km with an average depth of 3.99km, while the depth to shallow magnetic sources ranges between 0.46km to 0.67km and an average of 0.56km within the area. The mineralization pattern in this area follows the ENE-WSW direction.
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    Identification of Medical and Industrial Used Radioisotopes in Min- ing Sites of Nasarawa, Nasarawa State, Nigeria
    (Department of Physics, Nasarawa State University Keffi, 2021-11-11) Usman, Ridwan; Umar, Ibrahim; Samson, Dauda Yusuf; Idris, Mustapha Muhammad; Emmanuel, Ifeanyi Ugwu; Anyanninuola, O.S.
    This research intends to unveil the presence of radioisotopes in the soil of some mining sites in Nasarawa of Nasarawa state using thermos-scientific interceptor (IdentiFINDER). The work aimed at detecting the presence, types and trust level of radioisotopes. The result showed that, 103Pd and 125I were found in 57% of the total points and the percentage abundance of the detector reached 50-65% indicating that, those radioisotopes are likely found in the area, 109Cd was found in 15% of the total areas. The percentage abundance of the detector for 109Cd shows 50% indicating that, those radioisotopes are likely to be found in the area, 241Am was found in 7% of the total areas. The percentage abundance of the detector for 241Am shows 81% indicating that, those radioisotopes are likely found in the area, 235U was found in 7% of the total points. The percentage abundance of the detector for 235U reaches 57% indicating that, those radioisotopes are likely found in the area, 75Se was found in 7% of the total points. The percentage abundance of the detector for 75Se was in abundance up to 57% indicating that, those radioisotopes are likely gotten in the area and 57Co was gotten in 7% of the total areas. The percentage abundance of the detector for 57Co was 54% indicating that, those radioisotopes are likely to be gotten in the area. Based on this high percentage abundance of the detector for these radioisotopes, they can be harnessed and applied appropriately in medicine
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    pectral Analysis of Aeromagnetic Data over Some Parts of Central Benue Trough, Nigeria
    (Department of physics, Nasarawa State Univesity Keffi, 2019-03-28) Ibiene, I.E.; Ofoegbu, Charles O.; Anyanninuola, O.S.; Uko, Etim D.
    The spectral analysis of the magnetic anomalies over some part of Central Benue Trough, Nigeria, has been carried out in order to determine the magnetic source depths and the variability of basement structures. The aeromagnetic maps of the study area was digitized at two kilometer (2km) intervals and were subjected to multi-regression-least-squares analysis in order to obtain the residual field values. Two- dimensional (2-D) spectral analyses were then carried out to determine the average magnetic source depths. The results of the analysis reveal that the thickness of the sedimentary cover in the area varies between 1.25km and 5.60km; and 0.13km and 1.53km for deeper and shallower sources respectively. The results of this study are indicative of the basement overlain being irregular in shape and is associated with faulted structures
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    PROPOSED THERMAL MODEL OF SILICON-ON-INSULATOR (SOI) INTEGRATED CIRCUITS
    (Department of physics, Nasarawa State Univesity Keffi, 2018-10-13) Loko, A.Z.; Anyanninuola, O.S.; Muhammad, S.
    The Silicon-on-insulator (SOI) metal oxide semiconductor field effect transistor (MOSFET) structure with a layer of buried silicon oxide added to isolate the device body and the silicon substrate can significantly cut down source and drain depletion capacitances and can reduce the effect of short channel. Though, the low thermal conductivity of the buried oxide (BOX) can cause local heating, changed electrical properties, altered heat flow down interconnects, and failure of thermal devices. The current thermal models that are presently used in simulation of a circuit to account for thermal effects do not accurately capture the heat flow in the devices. However, accurate models rely on large network circuits or arithmetic simulations which does not execute speedily enough for large scale integrated circuit (LSIC) simulation. The drive of this research work is to advance a method that is efficient balance between accuracy, adaptability and speed and can be used in large scale simulation. The approach will integrate efficient SOI device thermal model and communicate thermal model into integrated circuit (IC) simulation, and will offer accurate, effective and efficient electro-thermal simulation tool for large scale SOI integrated circuit structure.
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    Subsurface Structures of Onshore Fuba Field, Niger-Delta, Niger
    (Department of physics, Nasarawa State Univesity Keffi, 2020-10-10) Ochoma, U.; Uko, E.D.; Anyanninuola, O.S.
    The subsurface structural features of the Fuba Field Onshore Niger Delta, Nigeria using Well-log and 3D Seismic data are here presented. Well-to-Seismic ties, faults and horizon mapping, time-surface generation, velocity modelling and depth conversion were carried out using Petrel software. The structural interpretation of seismic data reveal highly synthetic and antithetic faults which are in line with faults trends identified in the Niger Delta. Of the 29 interpreted faults, only synthetic and antithetic faults are regional, running from the top to bottom across the field. These faults play significant roles in trap formation at the upper, middle and lower sections of the field. Two distinct horizons were mapped. Fault and horizon interpretation reveal closures which are collapsed creatal structures bounded by these two major faults. The depth structure maps reveal anticlinal faults. Reservoirs are found at a shallower depth from 6500 to 7500 ft and at a deeper depth ranging from 11500 to 13000ft. The depth residual maps reveal higher residuals associated with the eastern and western regions which are areas not penetrated by any well. The synthetic and antithetic faults act as good traps for the hydrocarbon accumulation in the study area. In reservoirs, hydrocarbons were encountered by all seven wells drilled in the field.