Nigeria Journal of Pure and Applied Physics

Use of spectral decomposition technique for mapping geologic features of ‘Reigh’ field, Onshore Niger Delta

O.K. Olaleye, P.A. Enikanselu, M.A. Ayuk — Thu, 06 May 2021 00:00:00 +0000

Spectral Decomposition Technique based on Short-Window Discrete Fourier Transform (SWDFT) was applied to threedimensional (3D) seismic data obtained from ‘Reigh’ field, onshore Niger Delta with a view to enhancing stratigraphic interpretation for geological features which are beyond seismic resolution. Two sands units from the study area were studied to produce spectrally decomposed
surfaces. The result of the study revealed thin bed layer at the centre of the field on sand unit ‘A’. Sand-filled meandering channel was
detected and highlighted in the northern part of sand unit ‘B’ based on Red-Green-Blue frequency modulation of spectral decomposition. The study has enhanced geologic understanding of the field by improving thin bed resolution, highlighting geologic features and displaying bed thickness variation of studied sand units in the study area.

Keywords: geologic features, Niger Delta, seismic data, spectral decomposition

The effect of electrodes on the voltage generation of microbial fuel cell

N.E. Adesiji, M. Adeoye, A.O. Omojokun, J.A. Fatile — Thu, 06 May 2021 00:00:00 +0000

Microbial fuel cell (MFC) is a device that coverts the chemical energy contents of organic matter to electrical energy by the catalytic action of microorganisms. Cow dungs as organic substrates were used in three sets of dual chambered MFCs to study the effects of
electrodes on the open circuit voltage (OCV) generation of MFC. The anode and cathode compartments were connected using a proton
exchange membrane, 1 kg of the cow dung diluted with 500 ml of water was introduced in the anode compartment of each of the setups. The electrode configurations for set-up 1, 2 and 3 respectively were Carbon-Carbon(C-C), carbon-copper(C-Cu) and carbon- zinc(C-Zn). Samples for microbial load count were collected every two days from the anode compartment of the MFC and analyzed using standard microbiological methods. The OCV of the three setups were measured daily for two weeks using a digital multimeter. The microbial load ranged from 4.2 × 10⁴to 8.5 × 10⁴ CFU/ml for bacteria and 2.1 × 10² to 2.3 × 10³ CFU/ml for fungi. The range (average) of the OCV obtained from the set-ups were 0.06 to 0.72 V (0.42 V) for the C–C; 0.02 to 0.67 V (0.26 V) for C-Cu and 0.11 to 0.78 V (0.39 V) for the C-Zn. The OCV for the C-C electrode combination showed an increasing trend while the OCV of C-Cu and C-Zn showed decreasing trends with increasing number of days. The C-C electrode combination gave the best OCV.

Keywords: microbial fuel cell, open circuit voltage, electrodes, organic substrate

Thermal Response at Room Temperature and Device Applications of Two Wood Species in Akure, South Western Nigeria

M.A. Adekoya, A.O. Adelakun, A.A. Faremi, S.S. Oluyamo — Thu, 06 May 2021 00:00:00 +0000

Thermal properties (Density, Thermal conductivity and Specific heat capacity) play important impact in the formation of devices
made of wooden materials. This study examines the room temperature thermal response of ten bulk samples from the species of Pterygota macrocarpa and Antiaris africana wood species found in South Western Nigeria. The samples were processed into appropriate shapes to fit into the parallel plane arrangement to determine the thermal properties. Temperature dependent models were used to obtain the specific heat capacities of the samples within a temperature variation of 308.25? - 310.00?. The results revealed that the thermal properties (thermal conductivities and specific heat capacities) increase as temperature increases for all the bulk samples considered. The results of the research showed that the selected wood samples could find useful applications in industrial insulating devices.

Keywords: Wood material, Lee’s disc apparatus, Temperature and Thermal properties.

Characterization of magnetic field horizontal component in selected stations along the 210^o MM

A. Idowu, A. Adimula — Thu, 06 May 2021 00:00:00 +0000

Characterizing the magnetic field horizontal component (H) variability helps to better accommodate the irregular fluctuations in
the electron/ion density of the ionosphere for mitigating short-wave radio communication and Global Navigation Satellite Systems (GNSS) disruptions. This study employed three year data (2007-2009) from Magnetic Data Acquisition System (MAGDAS) facilities at six (6) observatories along the 210o magnetic meridian (MM) for investigating hourly, seasonal and annual variations in the horizontal component of the Earth’s magnetic field. The baseline value of H was computed from its average value near local midnight hours between 2400 and 0100 local time (LT) and subtracted from other hours value for the hourly variation; while the monthly and annual averages were computed for seasonal and yearly analysis respectively. Results indicates that maximum values of Sq are recorded in equinoctial season with an annual peak value of 70.96 nT for year 2009 recorded at Langkawi (LKW) as against the lowest peak value of 27.45 nT recorded in Cooktown (CKT) at 1300LT.

Keywords: Magnetic field, horizontal component, solar quiet, seasonal variation, solar equinox

Nigeria Journal of Pure and Applied Physics

Use of spectral decomposition technique for mapping geologic features of ‘Reigh’ field, Onshore Niger Delta

The effect of electrodes on the voltage generation of microbial fuel cell

Thermal Response at Room Temperature and Device Applications of Two Wood Species in Akure, South Western Nigeria

Characterization of magnetic field horizontal component in selected stations along the 210o MM

Characterization of magnetic field horizontal component in selected stations along the 210^o MM