International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2570

IJPS Articles

Evaluation of simulated rain-based attenuation techniques at k-v frequency bands for satellite services under different modulation techniques over Southwestern Nigeria

January 2021

Rain-based attenuation (RBA) is a major deteriorating factor affecting radio wave signals operating at microwave and millimetre wave bands for a typical Earth-Space Communication Link (ESCL). Although the international telecommunication union (ITU) recommended a standard model for predicting RBA along the terrestrial and ESCL, the technique underperforms in tropical environments. However, the model can be supported by...

Author(s): J. S. Ojo, K. D. Adedayo and A. N. Uchegbu  

Coherent perfect absorption in plasmonic planar metasurface

December 2020

The coherent perfect absorption (CPA) for a planar resonator of silver has been elaborated here in numerical and analytical approaches. It is investigated numerically in different geometrical shapes and spectral regimes. The CPA mode is observed to be spectrally sensitive to the geometry of the resonator. The scattering matrix method is employed in theoretical analysis. The CPA conditions and output irradiance...

Author(s): Alamgir Badsha  

Analysis and feasibility of 50 kWp self-consumption solar photovoltaic system for four Senegalese typical climatic zones using PVsyst software

December 2020

This study investigates analysis and feasibility of 50 kWp self-consumption photovoltaic system used for supplying the electrical load of military bases in Senegal. It refers to a simulation of performance photovoltaic system in four Senegalese typical climatic zones. In constructing the 50 kWp self-consumption photovoltaic simulation, the number of modules is 144, the power of each module is 280 Wp, 18 modules are in...

Author(s): Adama Sarr, Cheikh Mohammed Fadel Kebe and Ababacar Ndiaye  

Fof2 prediction with IRI-2016 at Dakar Station during quiet activity over solar cycles 21 and 22

October 2020

This study deals with comparison between Dakar station ionospheric’s F2 layer critical frequency (foF2) data and the two subroutines (CCIR and URSI) of IRI-2016 model predictions. Comparisons are made for very quiet geomagnetic activity during the four phases of the solar cycles 21 and 22 (minimum, increasing, maximum and decreasing). Model's predictions are suitable with observed data by day than by night....

Author(s): Sibri Alphonse Sandwidi, Doua Allain Gnabahou and Frédéric Ouattara  

Modification of plastic tank for bio-digestion of food wastes for biogas generation for cooking foods

October 2020

The anaerobic states of the modified bio-digester and potentials of the generated biogas in cooking foods were evaluated. The study adopted experimental design. Data generated were analyzed using one - way analysis of variance and independent t-test. Carbon, free fatty acid, chemical and biochemical oxygen demand decreased significantly (p<0.05) while moisture and protein contents of the wastes increased...

Author(s): Nwankwo, Chibuzo Stanley and Okoyeuzu, Chigozie Francis  

Optical and scanning kelvin probe microscopic characterization of sol-gel synthesized aluminum doped zinc cobalt ferrite nanoparticles

October 2020

In this work, Zn1-xCoFe2AlxO4 (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0) ferrites were synthesized using the sol-gel method. XRD analysis was done and confirmed the formation of spinel structure, where the particle size and lattice parameter decrease with increase of aluminum concentration. This may be attributed to a shift of the bigger Al3+ ions, from the tetrahedral to the octahedral sites, interchanging with smaller Zn2+...

Author(s): Butembu Sabastine, Osamong Gideon Akou, Kamweru Paul Kuria, Gichumbi Joel Mwangi and Ndiritu Francis,  

Preparation of MWCNT/Ba0.2Sr0.2La0.6MnO3/PANI nanocomposites and investigation of its electromagnetic properties in KU-band

October 2020

The aim of this study was enhanced the absorption of electromagnetic waves by nanocomposite containing polyaniline (PANI), functionalized multi wall carbon nanotubes (MWCNTs) in the presence of magnetic Ba0.2Sr0.2La0.6MnO3 nanoparticles (NPs). At First MWCNTs was functionalized by 3:1 ratio of sulfuric and nitric acid, then functionalized MWCNTs was coated by NPs with the traditional sol-gel method. In the final step,...

Author(s): S. H. Hosseini, R. Paymanfar, T. Afshari and S. S. Hosseini  

Effects of elevated humidity on stratospheric ozone content in the tropics

October 2020

This study examines the effects of elevated humidity on stratospheric ozone content in the tropics, a case study of Nigeria. The specific stations in Nigeria studied with their co-ordinate include Makurdi (7.7°N 8.5°E), Maiduguri (11.9°N 13.2°E), Kano (12.0°N 8.5°E), Port-Harcourt (4.9°N 7.0°E) and Lagos (6.5°N 3.4°E). Using monthly mean stratospheric ozone data from Earth Probe...

Author(s): Chukwuebuka Stephen Ejimofor, Eucharia Chidinma Okoro, and William Tafon Sivla  

River water lever sensor as river flood warning system

October 2020

Senate Report recorded last 2013 show that tropical storms and floods are the principal disasters with 102 and 72 occurrences, respectively. Distinctly, flood is still one of the biggest problems of the country. Statistics shows that 31.9% of the natural disasters, which occur in the Philippines in the years 1990-2014, are attributed to flood related episodes with a mortality rate of 5.9%. The researchers seek to...

Author(s): Collenn Callanga, Carl Agustin Alegrado, Kathleen Hurano, Gwen Stefani Tenio, Paul Velarde and Clare Maristela V. Galon  

Application of integrated geophysical methods in environmental studies: A case study of oil spillage in Thange Area Makueni County, Kenya

August 2020

This research was conducted with the aim of mapping the extent of soil and ground water hydrocarbon contamination from an oil pipeline leak point within the area. An integrated geophysical survey approach involving horizontal electrical profiling (HEP), vertical electrical sounding (VES) and Gravity Survey was applied. Resistivity and gravity lows were identified as aquifer zones confined within basalts and potential...

Author(s): K’orowe Maurice O., Mwanzia Dorothy K., Obonyo Evance O., Kitavi Stephen M., Masila Karen N. and Machimbo Evans W.  

Variations in equatorial electrojet current along the 210ºMM chain: A comparison of two approaches

August 2020

Variations of equatorial electrojet (EEJ) in six Magnetic Data Acquisition System (MAGDAS) stations (four stations within the magnetic equator region and two stations outside the region) on the 210ºMagnetic Meridian (MM) chain were examined. Data of hourly values of horizontal component of magnetic field, H in the year 2007 for Cooktown (CKT), Amami-oh-Shima (AMA), Davao (DAV), Langkawi (LKW), Yap- Island (YAP) and...

Author(s): A. O. Idowu, I. A. Adimula and B. O. Adebesin  

Application of the alternative variational iteration method to solve delay differential equations

July 2020

In this paper, alternative variational iteration method (AVIM) is presented to solve linear and nonlinear delay differential equations (DDEs). A general lagrange multiplier is used to construct a correction functional. The proposed series solutions are found to converge to exact solution rapidly. The computation of three test examples of DDEs was presented to confirm the efficacy and validity of AVIM. The results...

Author(s): Ahmad A. H. Mtawal, Saif A. E. Muhammed and Ayiman A. Almabrok

Simulating ionosphere parameters by thermosphere-ionosphere-electrodynamics general circulation model

July 2020

Ionosphere region is the part of atmosphere layer where radio waves reflect for telecommunication. This is due to its composition in particles. Solar radiation hit particles in ionosphere. This phenomenon causes an ionization of particles in the ionosphere. According to the particles density in this region, radio waves emitted in telecommunication can pass through this region or be reflected. The ionization of...

Author(s): Emmanuel Nanéma, Christian Zoundi, Amadou Ousseini Kotia and Frédéric Ouattara  

Thermo-mechanical properties of V-5Cr-5Ti alloy: 3D molecular dynamics simulation

July 2020

This paper presents the results of the study of 3D molecular dynamics simulation to investigate the thermomechanical properties of the V-5Cr-5Ti ternary alloy. The main purpose of this work is to evaluate the quality of the Finnis-Sinclair potential for V-rich V-Cr-Ti random alloys with a body-centered-cubic (bcc) structure. The results demonstrated that the elastic constants of the V-5Cr-5Ti alloy are close to the...

Author(s): M. M. Aish and S. A. Aljasar  

Interpretation of aeromagnetic data over some parts of Sokoto Basin, Nigeria, using source parameter imaging and 3D Euler deconvolution methods

June 2020

This investigation is aimed at determining depth to the bottom of magnetic source and to reveal some certain geological features across Sokoto basin using source parameter imaging and 3D Euler deconvolution techniques. The investigation employed fifteen number aeromagnetic sheets covering longitude 4°30'E - 6°00E and latitude 11°00'N - 13°30'N. The total magnetic intensity of the area was...

Author(s): Suleiman Taufiq, Okeke, F. Nneka and Obiora, N. Daniel  

Determination and establishment of empirical relationship between magnetic susceptibility and mechanical properties of typical basement rocks in Southwestern Nigeria

June 2020

Magnetic susceptibility and mechanical properties of rocks in a typical basement complex Southwestern Nigeria were correlated with the aim of establishing empirical equations relating the two parameters and evaluate the parameters as related to its competency in hosting civil structures. A total of thirty rock samples were taken across the geology of the area and subjected to mechanical properties determinations....

Author(s): Akintorinwa, O. James, Ajayi, C. Ayodele and Oyedele, A. Akinola  

Influence of natural additives and crushed bricks on the physical and mechanical properties of repair and restoration mortars

May 2020

This study aims to evaluate the influence of different additives, including natural additives such as olive oil and eggs, on repair and restoration mortars. This work enables us to verify the effects of these natural components and their impact on the physical and mechanical characteristics of various types of repair mortars. Four mortar formulations were developed and analysed: Two jointing mortars, including the...

Author(s): Naima Abderrahim Mahindad  

Preparation of thermal neutron absorber based B4C/TiO2/polyaniline nanocomposite

April 2020

B4C nanoparticles (NPs) have been integrated at that point veiled by TiO2 NPs lastly composited by utilizing polyaniline (PANI), (B4C/TiO2/PANI). Shields of thermal neutrons by B4C/TiO2/PANI have been considered, B4C/TiO2/PANI nanocomposite was described by FTIR spectroscopy, and nanometer size, morphology, and structures of tests were estimated by SEM and XRD. The electric property was additionally performed by the...

Author(s): Seyed Hossein Hosseini, Mona Tarakameh and Sama S. Hosseini  

Solar events and seasonal variation of foF2 at Korhogo station from 1992 to 2002

March 2020

In this paper we report the effect of solar events (CMEs and solar winds) on foF2 diurnal profiles at Korhogo Station (Long 8.427° W; Lat: 9.336° N; dip: -1.88°) from 1992 to 2002. We reviewed on seasons and all the four geomagnetic activity classes (Quiet activity, recurrent activity, Shock activity, and Fluctuating activity). The results show that (1) Coronal Mass Ejections (CMEs) and high-speed solar...

Author(s): Karim Guibula, Jean Louis Zerbo, Salfo Kaboré and Frédéric Ouattara  

Performance assessment of cross polarization models at millimetre wavelengths along Earth–Space path in Nigeria

March 2020

Rain-induced depolarization impairments have been a constraint on the effective use of satellite communication systems at millimetre wave band especially in the tropical regions like Nigeria. This region often experiences high and varying degree of rainfall intensity accompanied with large raindrops due to distortion of raindrops when dual orthogonal polarization is employed to double the channel capacity without...

Author(s): H. O. David, M. O. Ajewole, J. S. Ojo and A. T. Adediji  

Estimation of swelling potential of Enugu Shale using cost effective methods

February 2020

The behavior of swelling soils is mainly governed by its mineralogical composition as well as its environmental factors and stress history. Enugu Shale is one of these shales that assessment of its soil swelling potential cannot only be based on its mineralogical composition alone. The identification of its clay mineral types is basic to understand the roles of other factors of swelling in the soils. The results of...

Author(s): Chidiebere Nnamani and Ogbonnaya Igwe  

Assessment of groundwater quality condition at Tarauni dumpsite area, Kano Northwestern Nigeria

January 2020

2-D resistivity imaging and physicochemical analysis were used to investigate the intrusion of leachates on groundwater quality around a dumpsite in Tarauni Local Government Area of Kano State, Nigeria. Four (4) imaging traverse lines were established and Wenner configuration was adopted using an electrode spacing from 5.0, 10.0, 15.0 to 60.0 m. Data collected from the imaging were inverted using AGI EarthImager 2D...

Author(s): Ismaila Adenoyi Sule, Mohammed Saleh, Maryam Lawan, Abdulrahim Ali Bunawa and Farouq Mohammed Jibril  

On the slow-time geomagnetic field modulation of cosmic rays

November 2019

In this work, monthly means of cosmic ray count rates from two mid latitude (Hermanus and Rome), and two higher latitude (Inuvik and Oulu) neutron monitors (NM) were employed and their variability was compared with geomagnetic stations that are in close proximity to the NMs. The data spans 1966 to 2008 and covers four solar cycles. The difference (CRdiff) between the mean count rate of all days and the mean of the five...

Author(s): Egbunu Friday, and Okpala Kingsley Chukwudi  

Assessment of heavy metal pollution in marine sediments receiving produced water, Delta State, Nigeria

October 2019

Every aspect of oil and gas operations poses significant negative impacts on the environment in varying levels, these environmental impacts have economic and public health consequences on the indigenes of the operation locality. Produced water discharge is one of such aspects of the upstream oil and gas operation whose potential for environmental degradation has necessitated both local and international regulations for...

Author(s): Moses Ngwoke, Ogbonnaya Igwe and Obinna Hyginus Ozioko  

Comparative study of caffeine content in beans and leaves of Coffea arabica using UV/Vis spectrophotometer

October 2019

Caffeine is one of the compounds found in coffee beans and other parts of coffee plant. However, the relative caffeine content in different coffee plant parts is least researched. Therefore, this study was designed to determine the content of caffeine in green coffee leaves and beans. In this work, we report content of caffeine in green coffee beans and leaves of Coffea arabica using UV/Vis spectrophotometer with...

Author(s): Adane Tadesse Dado, Yoseph Alresawum Asresahegn and Kusse Gudishe Goroya  

The magnetic moment of elementary particles is studied by space vector and space curvature

September 2019

This paper reaffirms the basic agreement of the material space theory: (1) Space is a physical existence; (2) "Force" is the action to space, and "force" is equal to the reciprocal value of "time"; in the absence of special description, "force" is the reciprocal of time; (3) There is a steady velocity field in three-dimensional space, whose intensity is the speed of light C; (4)...

Author(s): Haitao Gao  

Seasonal analyses of solar radiation on flat ground for different stat of sky: Case of Nouakchott, Mauritania

August 2019

This paper proposes a method to evaluate solar energy on flat ground for different state of sky (clear sky, moderately covered sky and covered sky). Four semi-empirical models (Link Cloudiness Factor (LCF), Perrin-Brichambaut (PB), Ghouard (GD), Bird Hulstrom (BH)) have been considered to predict solar radiation. An influence analysis of the seasonal variation on the quality of solar energy potential was carried out. In...

Author(s): Eslemhoum Jiddou ABDI, Mohamed Mahmoud ALI, Boudy BILAL, Nourou DIA, Mamoudou NDONGO, Ckeikh Mohamed Fadel KEBE and Papa Alioune NDIAYE

Integrated geophysical approach for imaging sedimentary outcrop at Northwestern Peninsular Malaysia

August 2019

An outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. In recent years, outcrop studies have become very important to understand the geology of the earth. The lack of studies on outcrops depends on the interpretations and observations at the surface of the earth only. Besides that, lack of specific physical value for the type of materials can cause misinterpretation of...

Author(s): Nordiana Mohd Muztaza, Nordiana Ahmad Nawawi, Hazrul Hisham Badrul Hisham, Muhamad Taqiuddin Zakaria and Adeeko Tajudeen Olugbenga  

Gravitational waves as a test of general relativity

August 2019

General relativity has been very successful as a model for space and gravity. It is supported from a range of experimental results. With the advent of the detection of gravitational waves, another platform exists to trumpet its triumph. The merger of black holes has provided evidence in support of the theory of Einstein. Furthermore, the one neutron star merger so far detected provides much more information because of...

Author(s): Keith John Treschman  

Mineralogical and major oxide characterization of Panyam clays, North - Central Nigeria

July 2019

Clay minerals are form over long periods of time, through weathering as a result of gradual chemical breakdown of rocks rich in feldspar. The extent of weathering is determined by many factors. Most common constituent mineral of clays is often one of the members of the mica mineral group. They include illite, sericite, muscovite, and biotite. Others are kaolinite, smectite, mixed-layer clays and chlorite. This paper...

Author(s): Umbugadu A. A. and Igwe O.  

A framework of 5G networks as the foundation for IoTs technology for improved future network

June 2019

The quest for improved communications among objects interconnected in a network has long been awaited. The current fourth generation network (4G) does not enable the range of services the future require, as the fifth-generation network (5G) will be faster and more flexible. The 5G networks and Internet of Things technology seem to be the reality that best describes the basic principles of the future generation mobile...

Author(s): Modesta E. Ezema, Francis A. Okoye and Anthony O. Okwori  

Designing off-grid hybrid energy supply with photovoltaics in Senegal

June 2019

In Africa, electrification of rural areas are low and off-grid power supply is needed. Often diesel generators are used to provide local electricity supply. However, the tremendous decrease in the costs of photovoltaics provides an attractive option to substitute existing diesel generation or to build up a new electricity supply in those locations, lowering power costs and environmental impact. Photovoltaics (PV) hybrid...

Author(s): T. Schneiders, L. Alvarez and S. Fassbender  

Application of density matrix renormalization group to one-dimensional Hubbard model to study strongly correlated electrons system

June 2019

In this work, we applied density matrix renormalization group to one-dimensional Hubbard model at five numbers of sweep to solve strongly correlated interacting electrons system, starting from two electrons on two sites up to ten electrons on ten sites at half filling. The results that emerged from the present study is in agreement with that of exact diagonalization, variational and Lanczos solution at the varying...

Author(s): Olusanmi Ebenezer Odeyemi Akinola Samson Olayinka Arthur Imooah Ejere  Ikponmwosa Samuel Okunzuwa, Enorense Eddy Aigbekaen and John O.A. Idiodi  

Multivariate statistical assessment and spatial distribution of groundwater contamination in Neke and its environs, South-Eastern Nigeria

May 2019

Groundwater quality in Neke area of southeastern Nigeria was investigated applying multivariate statistical analyses using Statgraphics centurion XVII, ArcGIS 10.2.2 and Surfer 10 software on hydrochemical and bacteriological data from 25 groundwater samples over land cover of about 1283 km2 , in order to unravel the factors influencing ground water quality. From the correlation analysis, Ca2+, Mg2+, K+, and SO42-...

Author(s): Onwuka Solomon Obialo and Ezugwu Chimankpam Kenneth  

Magneto-Stark effect on exciton in parabolic bandGaAs/〖Ga〗_(0.7) 〖Al〗_(0.3) As quantum well heterostructure

May 2019

The effect of applied crossed electric and magnetic fields on the heterostructure semiconductor is used in the scientific investigation on electronic and optical exciton properties. The aim of this work is to study the magneto-Stark effect for confined excitons in single GaAs-〖Ga〗_(0.7) 〖Al〗_(0.3) As QWs. The magnetic field B is taken as perpendicular to the z-growth direction of the heterostructure, whereas the...

Author(s): Alemu Gurmessa and Menberu Mengesha  

Estimation of sedimentary thickness using spectral analysis of aeromagnetic data over Otukpo and Ejekwe areas of the lower Benue Trough, Nigeria

April 2019

The aeromagnetic data of Otukpo (sheet 270) and Ejekwe (sheet 289) areas of the lower Benue Trough of Nigeria were interpreted quantitatively. The quantitative interpretation employed spectral analysis technique with the aim of locating specific basement depths to buried magnetic source rocks in the study area. First order polynomial fitting was adopted for regional-residual separation of the total magnetic intensity...

Author(s): Asielue, K. O., Ugwu, G. Z. and Ikeh, J. C.  

A study on the effects of solar wind and interplanetary magnetic field on geomagnetic H-component during geomagnetic storms

April 2019

During geomagnetic storms, the geomagnetic H component is depressed which is preceded by a sudden storm commencement (SSC) or not and this is categorized as sudden or gradual storms. Using the method of cross correlation analysis, we have studied the associations of geomagnetic H components at four low latitude stations at longitudinal separations of 145° - 215° with solar wind density and interplanetary...

Author(s): S. O. Chiaha, O. J. Ugonabo and K. C. Okpala  

Magnetic source basement depth determination of Ikogosi Warm Water Spring South Western Nigeria and the environ using aeromagnetic data

March 2019

Structural features of Ikogosi Warm Spring and its environs have been delineated using qualitative and quantitative interpretation methods. Euler-Deconvolution and local wave number methods were adopted for quantitative and qualitative interpretation of aeromagnetic data sheet 243 by Geological Survey Agency of Nigeria (GSN) in 2008, respectively. Euler solution revealed depth range of -2.98 to -290 m to the magnetic...

Author(s): Ayobami I. Ojoawo and Muideen I. Lateef  

Structural, magnetic and transport properties of samarium (Sm) doped Cu-Zn ferrites

March 2019

The present work is focused on investigating the effect of rare earth ion on structural, magnetic and transport properties of (Cu0.5Zn0.5Fe2-x)SmxO4[x = 0.00, 0.05 and 0.10] ferrites which were prepared by solid state reaction technique at 1100°C for 3 h. The X-ray diffraction analysis revealed that rare earth free sample shows formulation of single phase cubic spinel structure with no extra peak whereas Sm...

Author(s): Prodip Kumar Mondal, Mohammad Alamgir Hossain, Mohammed Nazrul Islam Khan and Shibendra Shekher Sikder

Thermospheric neutral winds over Abuja, Nigeria

January 2019

We present nighttime variation of thermospheric winds estimated from the Fabry-Perot interferometer (FPI) which was recently deployed at Abuja in Nigeria. These results apply to the thermosphere region around 250 km and were obtained during the period of weak solar activity with solar flux values generally below 70 s.f.u. The results presented cover three months, from October 2017 to December 2017. The high geomagnetic...

Author(s): Sivla W. T., Ogunjobi O., Okoro E. C., Ugonabo O. J. and Orji P. O.  

Spectral analysis and source parameter imaging of aeromagnetic data of Lafia and Akiri Areas, Middle Benue Trough, Nigeria

January 2019

This study aimed to estimate the depth of magnetic source bodies in Lafia and Akiri areas which fall within the middle Benue trough, Nigeria. Aeromagnetic data were used and spectral analysis and source parameter imaging were used for the quantitative interpretation of the data. The total magnetic intensity (TMI) contour map obtained from gridding of the data ranging from -39.5 to 100.0 nT was separated into regional...

Author(s): Ngozi Agatha Okwesili, Johnson Uchenna Abangwu and Igwe Emmanuel Awucha.  

Magnetosphere convection electric field (MCEF) time variation from 1964 to 2009: Investigation on the signatures of the geoeffectiveness coronal mass ejections

December 2018

The signatures of the geoeffectiveness solar disturbed events on the Magnetosphere Convection Electric Field (MCEF) universal time variation from 1964 to 2009 are investigated. Here, attention is focused our on the periods concerned by the whole shock activity and by the different types of the geoeffectiveness Coronal Mass Ejections (CMEs) which are one-day-shock, two-days-shock and three-days-shock. The investigation...

Author(s): Kaboré Salfo and Ouattara Frédéric  

Assessment of outdoor radiation levels and radiological health hazards in Emene Industrial Layout of Enugu State, Nigeria

December 2018

A study to assess the outdoor Background Ionizing Radiation (BIR) levels in Emene Industrial Layout of Enugu State, Nigeria has been conducted. An in-situ measurement of BIR exposure rate in mRh-1 for 30 locations was done using a well calibrated portable GQ GMC-320 PLUS nuclear radiation detector at an elevation of 1.0 m above ground level with a geographical positioning system (GPS) for geographical location. The...

Author(s): Ugbede F. O. and Benson I. D.  

Noise exposure levels and health implications on daily road side petty traders at some major roundabouts in Ibadan, Nigeria

December 2018

The level of noise exposure to daily road side traders at five major roundabouts in Ibadan metropolis was assessed. Noise measurements were made using a precision multi-function sound level meter. Measurements were made at three different periods of the day; morning (7:30 to 11:30 a.m.), afternoon (12:00 to 3:00 p.m.) and evening (4:00 to 5.00 p.m.) for a consecutive period of ten days. The highest mean maximum noise...

Author(s): Ogunseye T. T., Jibiri N. N. and Akanni V. K.  

Mathematical modeling and numerical simulation for the formation process of nanofilms

November 2018

This study applied a generalized model to describe and optimize the formation process of nanofilms from their polymeric solutions. Through this model, one can optimize the concentration of the solvent in the polymeric solution, the appropriate geometric dimensions as well as the nanofilm formation speed. A comparison of this model with experimental data has revealed some similarities and differences in the...

Author(s): M. M. Aish  

Deriving an expression for electron-reflection-coefficient at metal-semiconductor-interface of dye-sensitized solar cells

October 2018

This work aims to derive an expression to describe the reflection coefficient of an escape electron from metal-semiconductor interface of DSSC.  The derivation was obtained by analytically solving electron diffusion equation with assumptions of steady state DSSC and negligible current flow at the outer most part of the film. The derived corrected Richardson-Dushman equation including a reflection of electron wave...

Author(s): Lurwan Garba  

Quantification and correction of the Thomsen’s Delta Anisotropy for improved quantitative seismic interpretation in “AMFO” Field, Western Niger Delta

October 2018

The Niger Delta is a sedimentary deposit with continuing sediment deposition to date. In a stratified earth, seismic waves tend to propagate faster along layers than across layer boundaries. Shales, due to the clay minerals they contain, exhibit similar behavior. As a result, velocities derived from surface seismic are often faster than well-derived velocities, causing depths of structures from surface seismic...

Author(s): Ogagarue D. O. and Ebeniro J. O.  

Radionuclide concentration: The coal ash effect

August 2018

Radionuclide concentrations in coal ash, soil mixed with coal ash and soil were determined using the gamma spectroscopic method. The average activity concentrations of 226Ra, 232Th, and 40K in coal ash samples were found as 35.0, 5.8, and 109.4 Bq/kg, respectively. The average activity concentrations of 226Ra, 232Th and 40K in soil mixed with coal ash samples varied from 21.2 to 30.8, 48.6 to 82.7, and 162.5 to 180.1...

Author(s): Amakom M. Chijioke, Orji E. Chikwendu, Iroegbu Chinedu, Eke C. Benedict, Nkwoada U. Amarachi, Madu D. Afam, Ugochuwu G. Kosisochukwu and Oforma J. Tochukwu  

Mineralogical and geochemical properties of clay deposits in parts of Southeastern Nigeria

July 2018

The rocks underlying many parts of Southeastern Nigeria had undergone extensive alterations to form considerable clay deposits. The mineralogical compositions of some of these clay deposits were evaluated with the X-Ray Diffraction (XRD) method to ascertain the suitability of the deposits as raw materials. Results of the analyses indicated that kaolinite (Al2Si2O5 (OH)4) is the dominant clay mineral. Traces of bentonite...

Author(s): Onyekuru S. O., Iwuoha P. O., Iwuagwu C. J., Nwozor K. K. and Opara K. D.  

Theoretical models for prediction of methane production from anaerobic digestion: A critical review

July 2018

This work presents a critical analysis for three models group of methanogen potential prediction. The first group allows determination of the methane productivity of substrates, through three models (BMPthCOD, BMPthAtC and BMPthOFC). The BMPthCOD is suitable for a first approximation calculation. BMPthAtC and BMPthOFC are more accurate; however, require a complex characterization of substrates. The second models group...

Author(s): Mohamed Mahmoud ALI, Nourou DIA, Boudy BILAL and Mamoudou NDONGO  

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