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Institution

Akwa Ibom State University

EducationUyo, Nigeria
About: Akwa Ibom State University is a education organization based out in Uyo, Nigeria. It is known for research contribution in the topics: Aquifer & Diatomic molecule. The organization has 331 authors who have published 472 publications receiving 2360 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, a laboratory study on the stabilization of black cotton soil (BCS) with up to 8% lime admixed with 10% iron ore tailing (IOT) by dry weight of soil compacted with British Standard light, BSL energy (relative compaction 100%) was carried out to establish the soil improving potential of the lime -IOT blend.
Abstract: A laboratory study on the stabilization of black cotton soil (BCS) with up to 8% lime admixed with up to 10% iron ore tailing (IOT) by dry weight of soil compacted with British Standard light, BSL energy (relative compaction – 100%) was carried out to establish the soil improving potential of the lime – IOT blend. Tests carried out include index, compaction, strength and durability. Unconfined compressive strength (UCS), CBR (soaked and unsoaked condition) and resistance to loss in strength of specimen yielded peak values at 8% lime/8% IOT treatment. Microanalysis using scanning electron microscope (SEM) revealed that crystalline hydration products present in the optimally treated black cotton soil majorly contributed to the gain in strength. The batch equilibrium test results on the leaching potential of iron (Fe2+) from the BCS–lime–IOT mixture into the environment show that the desorbed value 0.272 mg/l of iron (Fe2+) concentration for 8% lime/8% IOT content falls within the permissible value of not more than 0.3 mg/l iron (Fe2+) concentration for drinking water recommended by the World Health Organisation (WHO) and Nigerian Industrial Standard (NIS). Based on strength criterion, an optimal 8% lime/8% IOT is recommended for treatment of black cotton soil for use as sub base material in the construction of low volume roads. The benefits of the application include reduction in the environmental impact of the disposal of iron ore tailings.

100 citations

Journal ArticleDOI
TL;DR: In this article, the authors have used information generated from geophysical, geochemical and hydrogeological data in assessing the groundwater resource potential, quality and usability and in mapping flow directions within the shallow subsurface of the Mamfe Embayment, Cross River State, Nigeria.
Abstract: Information generated from geophysical, geochemical and hydrogeological data has been used in assessing the groundwater resource potential, quality and usability and in mapping flow directions within the shallow subsurface of the Mamfe Embayment, Cross River State, Nigeria. The electrical resistivity technique in which the Schlumberger’s vertical electrical sounding field procedure has been adopted was the geophysical method employed; lithology logs from drilling records, discharge rates, static water level information were the hydrogeological information utilized, while the geochemical techniques involve analyses of water samples. Apparent resistances were measured using different resistivity meters including OYO McOhm (model 2115), ABEM terrameter (SAS300B and SAS1000 models) and IGIS (SSP-ATS-MRP model) with maximum current electrode separation reaching 1 km in some communities. Geological information was used as control in the modelling and interpretation of all geophysical data. The physico-chemical parameters of the water samples from the different water sources in the area were determined using different analytical techniques and in some cases, by in situ direct measurement of some parameters. Measured values of electrical conductivity, static water level, available aquifer discharge information and calculated SAR and %Na were integrated into the geophysical and hydrogeological results. The shallow subsurface of the area is segmented into four hydrogeological provinces [crystalline basement province (CBP), Cross River Plain Province (CRPP), Nkporo-Afikpo Shales Province (NASP) and alluvial/buried river province (ABRP) with localized groundwater flow patterns]. Results indicated that the alluvial (discharge rate of 3.83 L/s), fractured sandstone (discharge rate of 2.43 L/s) and basement (discharge rate of 1.80 L/s) aquifers are more yielding than the aquifers in areas covered with deformed shales (discharge rate of 0.62 L/s) and siltstone aquifers (discharge rate of 0.97 L/s). The aquifer horizons are inhomogeneous and anisotropic with topography and lithology exerting significant influence on groundwater flow direction. However, there appears to be some high yielding aquifers at depths greater than 100 m in the CRPP areas although researches on their distribution are still ongoing. Precipitation is the major source of recharge and the water is enriched with Na+, K+, Ca2+, Mg2+, $${\text{HCO}}_{ 3}^{ - }$$ , Cl−, $${\text{SO}}_{ 4}^{2 - }$$ and $${\text{NO}}_{ 3}^{ - }$$ throughout the year. Graphical analyses of hydrochemical data using Piper and Stiff diagrams show that Ca–(Mg)–CO3–HCO3 is the dominant water facies. Results from EC, SAR and %Na show that the water is fresh and belongs to the good-to-excellent class and is, therefore, suitable for domestic, agricultural and industrial use.

76 citations

Journal ArticleDOI
TL;DR: In this article, an approximate solution of the Schrodinger equation for the modified Kratzer potential plus screened Coulomb potential model, within the framework of Nikiforov-Uvarov method, was obtained.
Abstract: We obtained an approximate solution of the Schrodinger equation for the modified Kratzer potential plus screened Coulomb potential model, within the framework of Nikiforov–Uvarov method. The bound state energy eigenvalues for N2, CO, NO, and CH diatomic molecules were computed for various vibrational and rotational quantum numbers. Special cases were considered when the potential parameters were altered, resulting into modified Kratzer potential, screened Coulomb potential, and standard Coulomb potential, respectively. Their energy eigenvalues expressions and numerical computations agreed with the already existing literatures.

76 citations

Journal ArticleDOI
TL;DR: In this article, the bound-state solutions of the radial Schrodinger equation with this adopted molecular model via the Factorization Method were obtained by using the improved Pekeris-type approximation, to deal with the centrifugal term.
Abstract: The Deng–Fan–Eckart potential is as good as the Morse potential in studying atomic interaction in diatomic molecules. By using the improved Pekeris-type approximation, to deal with the centrifugal term, we obtain the bound-state solutions of the radial Schrodinger equation with this adopted molecular model via the Factorization Method. With the energy equation obtained, the thermodynamic properties of some selected diatomic molecules (H2, CO, ScN and ScF) were obtained using Poisson summation method. The unnormalized wave function is also derived. The energy spectrum for a set of diatomic molecules for different values of the vibrational n and rotational $$\ell$$ are obtained. To show the accuracy of our results, we discuss some special cases by adjusting some potential parameters and also compute the numerical eigenvalue of the Deng–Fan potential for comparison sake. However, it was found out that our results agree excellently with the results obtained via other methods.

70 citations

Journal ArticleDOI
TL;DR: In this paper, the authors review microplastic's impact on agroecosystem components and possible effects on the food chain and propose a solution to deal with the problem.
Abstract: This work reviews microplastic's impact on agroecosystem components and possible effects on the food chain. Microplastics are sized

68 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202213
2021106
2020100
201972
201850