Physical Sciences Articles
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  1. Assessment of Activity Concentration of Radionuclides in Sediment from Oil Producing Communities of Delta State, Nigeria

    Prof. Ibiyinka A. Fuwape et. al.

    ABSTRACT Activity concentrations of twenty-six (26) samples of sediment collected from rivers from eleven (11) oil-producing communities and two (2) non-oil producing communities in Delta state of Nigeria were studied. Hyper Purity Germanium (HPGe) Detector was used for counting and detection of radionuclide content of all samples. Results of the samples analysed showed that the radioactivity concentrations of K40, Th232 and U238 in the sediment samples from oil-producing areas range from 32.47 Bq∙kg−1 to 525.1 Bq∙kg−1 with an average of 302.15 Bq∙kg−1, 6.31 Bq∙kg−1 to 19.33 Bq∙kg−1 with an average of 11.66 Bq∙kg−1, and 4.45 Bq∙kg−1 to 18.69 Bq∙kg−1 with an average of 8.66Bq∙kg−1 respectively.

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  2. Assessment of radiological parameters of soil in Kogi State, Nigeria

    Prof. Ibiyinka Fuwape

    Abstract The natural radioactivity levels of soil samples collected from four local government areas in Kogi State, Nigeria were measured using a hyper-pure germanium detector, and the radiological hazard parameters associated with them were estimated. The measured concentration ranged from 7.82 ± 0.63 to 82.22 ± 1.99 Bq kg−1 for 238U, 11.05 ± 1.10 to 114.86 ± 4.72 Bq kg−1 for 232Th, and 3.38 ± 0.50 to 1272.20 ± 23.36 Bq kg−1 for 40K. Omala local government was found to have the highest concentrations of 238U (44.31 Bq kg−1) and 232Th (52.13 Bq kg−1), while Ajaokuta has the highest concentration of 40K (711.72 Bq kg−1).

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  3. Determination of Cyanide Content in Three Sweet Cassava Cultivars in Three Local Government Areas of Benue State, Nigeria

    Monday Abel Otache et. al.

    Abstract The cyanide content of the parenchyma (pulp) of three sweet cassava cultivars: Alhaji (Tropical Manihot Selection; TMS 98/0581), Ochengbila (Tropical Manihot Selection; TMS 98/0505), and Onono (Tropical Manihot Selection; TMS 98/0524) from three local government areas of Benue State were studied. Their contents were: TMS 98/0581 (41.46 - 53.40) mg/kg, TMS 98/0505 (45.12 - 58.93) mg/kg and TMS 98/0524 (46.38 - 58.08) mg/kg for all the local government areas. For the peels, it ranged from (63.41 - 108.96) mg/kg for all cultivars.

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  4. Dynamics of vertical profile of radio refractivity in Akure, South-Western Nigeria

    Prof. Ibiyinka Fuwape

    Abstract This research investigated fractal and chaotic dynamics in the vertical profile radio refractivity in the atmosphere using Tsallis Entropy, Hurst Exponent and Largest Lyapunov Exponent (LLE). Daily temperature, relative humidity and radio refractivity data obtained from the European Centre for Medium Range Weather Forecasts (ECMWF) Re-Analysis Project at thirty seven (37) different atmospheric pressure level from 1979 - 2014 were used in this study.

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  5. FRACTAL AND ENTROPY ANALYSIS OF NIGERIAN ALL SHARE INDEX (ASI) AND GROSS DOMESTIC PRODUCT (GDP)

    Prof. Ibiyinka Fuwape

    ABSTRACT Nigeria is one of the fastest growing economy in the world. This study aims to investigate the dynamics of two important economic indices in Nigeria – All Share Index (ASI) and Gross Domestic Product (GDP) using the Hurst and Entropy measures. Data used in this study were obtained from the Central Bank of Nigeria for the period 1981 – 2012.

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  6. Increased-order generalized synchronization of chaotic and hyperchaotic systems

    Prof. Ibiyinka A. Fuwape et. al.

    ABSTRACT This paper presents increased-order generalized synchronization (GS) of chaotic and hyperchaotic systems with different order based on active control technique. By this technique, we design suitable control functions to achieve GS between (i) a new three-dimensional (3D) chaotic system and four-dimensional (4D) hyperchaotic Lorenz system and (ii) four-dimensional hyperchaotic Lorenz system and five-dimensional (5D) hyperchaotic Lorenz system. The corresponding numerical simulation results are presented to verify the effectiveness of this technique.

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  7. Measurements and Analysis of the Electrical Conductivity of Selected Honey Samples in Nigeria

    Godwin Kparobo Agbajor, Monday Abel Otache and Ambrose Emuobonuvie Akpovona

    ABSTRACT Honey is a natural complex food product produced by bees from nectar of plants and from honeydew. It is a unique sweetening agent that can be used by humans without processing. The study is based on the determination and analysis of the electrical conductivity of this natural product with change in temperature.

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  8. Phase synchronization between tropospheric radio refractivity and rainfall amount in a tropical region

    Prof. Ibiyinka Fuwape

    Abstract This study investigated linear and nonlinear relationship between the amount of rainfall and radio refractivity in a tropical country, Nigeria using forty seven locations scattered across the country. Correlation and Phase synchronization measures were used for the linear and nonlinear relationship respectively.

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  9. Polynomial Solutions of Bloch NMR Flow Equations for Classical and Quantum Mechanical Analysis of Fluid Flow in Porous Media

    Prof. Ibiyinka A. Fuwape et. al.

    ABSTRACT In many NMR experiments it is noticed that liquids confined in porous materials exhibit properties that are different from those of the bulk fluid. Determining the relationship between macroscopic properties and the microscopic structure of porous materials and their components has been difficult. Despite decades of study, researchers’ understanding is generally limited to empirical correlations based on laboratory measurements. Only recently have researchers been able to calculate a few of the macroscopic physical properties of rocks from first principles.

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  10. Spatial variation of deterministic chaos in mean daily temperature and rainfall over Nigeria

    Prof. Ibiyinka Fuwape

    Abstract Daily rainfall and temperature data from 47 locations across Nigeria for the 36-year period 1979–2014 were treated to time series analysis technique to investigate some nonlinear trends in rainfall and temperature data. Some quantifiers such as Lyapunov exponents, correlation dimension, and entropy were obtained for the various locations.

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  11. Spontaneous firing statistics and information transfer in electroreceptors of paddlefish

    Prof. Ibiyinka Fuwape and Alexander B. Neiman

    ABSTRACT We study information processing in a peripheral sensory receptor system which possesses spontaneous dynamics with two distinct rhythms. Such organization was found in the electrosensory system of paddlefish and is represented by two distinct and unidirectionally coupled oscillators, resulting in biperiodic spontaneous firing patterns of sensory neurons. We use computational modeling to elucidate the functional role of spontaneous oscillations in conveying information from sensory periphery to the brain. We show that biperiodic organization resulting in nonrenewal statistics of background neuronal activity leads to significant improvement in information transfer through the system as compared to an equivalent renewal model.

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  12. Synchronization in a chain of nearest neighbors coupled oscillators with fixed ends

    Prof. Ibiyinka Fuwape et. al./p>

    ABSTRACT We investigate a system of coupled phase oscillators with nearest neighbors coupling in a chain with fixed ends.We find that the system synchronizes to a common value of the time-averaged frequency, which depends on the initial phases of the oscillators at the ends of the chain. This time-averaged frequency decays as the coupling strength increases. Near the transition to the frozen state, the time-averaged frequency has a power law behavior as a function of the coupling strength, with synchronized time-averaged frequency equal to zero.

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  13. The comparative study of chaoticity and dynamical complexity of the low-latitude ionosphere, over Nigeria, during quiet and disturbed days

    Prof. Ibiyinka A. Fuwape et. al.

    ABSTRACT The deterministic chaotic behavior and dynamical complexity of the space plasma dynamical system over Nigeria are analyzed in this study and characterized. The study was carried out using GPS (Global Positioning System) TEC (Total Electron Content) time series, measured in the year 2011 at three GPS receiver stations within Nigeria, which lies within the equatorial ionization anomaly region. The TEC time series for the five quietest and five most disturbed days of each month of the year were selected for the study. The nonlinear aspect of the TEC time series was obtained by detrending the data.

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  14. The transient variation in the complexes of the low-latitude ionosphere within the equatorial ionization anomaly region of Nigeria

    Prof. Ibiyinka Fuwape et. al.

    ABSTRACT The quest to find an index for proper characterization and description of the dynamical response of the ionosphere to external influences and its various internal irregularities has led to the study of the day-to-day variations of the chaoticity and dynamical complexity of the ionosphere. This study was conducted using Global Positioning System (GPS) total electron content (TEC) time series, measured in the year 2011, from five GPS receiver stations in Nigeria, which lies within the equatorial ionization anomaly region. The non-linear aspects of the TEC time series were obtained by detrending the data.

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  15. Validation of the AlereTM Methamphetamine Microplate ELISA for the Detection of Methamphetamine in Oral Fluid

    Monday Abel Otache et. al.

    Abstract Abuse of methamphetamine is one of the major social problem faced by many countries. Oral fluid as an alternative matrix for assessing drugs of abuse is gaining prominence. It is therefore essential to investigate assay performance and limitations of screening techniques for methamphetamine in oral fluid. The purpose of this study was to evaluate the validity of AlereTM methamphetamine microplate competitive enzyme-linked immunosorbent assay (ELISA) for the analysis of methamphetamine in oral fluid.

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  16. Women in Physics in Nigeria: Status, Actions, and Progress (2011–2014)

    Prof. Ibiyinka A. Fuwape, Babatunde Rabiu, and Samuel Ogunjo

    Abstract In Nigeria the number of women taking up a career in physics is increasing. The progress made by Nigerian women in physics is presented. The Nigerian Women in Physics working group continues to organize activities to encourage more girls and women into physics. One of such activity is the biannual conference of women in physics in Nigeria.

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