Browsing by Author "Dada, O. E."

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    Cadmium Tolerance and Phytoremediation Strategies of Selected Tropical plants Cultivated on Industrial Dump Site under the Influences of Two Mycobionts
    (West African Journal of Applied Ecology, 2020-01-23) Dada, O. E.
    This research was carried out on a waste disposal site of a paint industry in Ijebu- Ijesha, Osun State, Nigeria in an attempt to assess the cadmium toxicity tolerance and bioremediation strategies of selected tropical plants cultivated under the influence of two mycobionts. On the waste disposal site, two plots (Plot A and B) having size of about 9 m by 12 m each were prepared with a control plot (Plot C) which is a non-polluted site. The experimental design on the first plots (Plot A) was 4x2x3 in which viable seeds of the four selected weeds were grown and inoculated with two mycobionts (Glomus intraradices and Glomus mosseae) respectively in a randomized complete block design with three replicates. However, on the second (Plot B) and control plots, only the seeds of the weeds were grown without mycorrhiza treatment using the same experimental design of 4x3 respectively. After Twelve weeks of planting, each plant was harvested, separated into root and shoot tissues and analysed for Cd concentrations using Atomic Absorption Spectrophotometry (AAS). Data collected were subjected to descriptive and inferential statistics. The highest (18.51 mg/kg) concentrations of Cd were reported in Amaranthus spinosus with root and shoot bioconcentration factors; and transfer factors greater than 1.00. Out of the four plants, 75% act as cadmium phytostabilizers in the absence of inocula and were good candidates for the biomanagement of hazardous sites while all the plant displayed the characteristics of a cadmium phytoextractor under mycorrhizal inoculation with Amaranthus spinosus having the highest mobility indices of cadmium under the influence of Glomus intraradices. The study concluded that the four weeds are good Cd phytoextractors in the remediation and biomanagement of marginal lands under bioaugmentation.
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    Global Climate Change: The Empirical Study of the Sensitivity Model in China’s Sustainable Development, Part 2
    (Taylor and Francis Online : Energy Sources, Part A: Recovery, Utilization, and Environmental Effects,, 2015) Ojekunle, Z. O.; Oyebamji, F. F.; Olatunde, A. O.; Sangowusi, O. R.; Ojekunle, V. O.; Amujo, B. T.; Dada, O. E.
    In the evolution of CO2 emission intensity, population, total CO2 emission, annual gross domestic product growth, emission intensity, and emission per unit energy index is mainly an empirical issue that cannot resolve with certainty from the experience of a group of countries during a given period of time. The present empirical study reveals that the listed variables cannot be evaluated unambiguously using either variation in carbon emission factor or product of many factors put together as the criteria. Different levels of CO2 emission intensities in different regions resulting from different causes are not a constant or evaluated using constant variables. The article focuses on the challenges of climate change on development in recent times—observed and future climate change and variability, which are a factor of the energy mix utilization within China for some years ago, thus establishing methodology that linked greenhouse gases effect and climate change by Sensitivity Model Prof. Vester in China, in an attempt to evaluate a sustainable indicator in greenhouse gases and change effects.
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    THE IMPACT OF GEOMETRY FACTORS ON NMR DIFFUSION MEASUREMENTS BY THE STEJSKAL AND TANNER PULSED GRADIENTS METHOD
    (International Journal of Theoretical Physics, Group Theory and Nonlinear Optics, 2011) Dada, O. E.; Faromika, O. P.; Awojoyogbe, O. B.; Dada, O. E.; Aweda, M. A.
    Diffusion imaging and particularly diffusion tensor imaging have become popular due to their numerous clinical and research applications which span from brain stroke evaluation to fiber tracking. With few exceptions, these methods are rooted in the classical Stejskal-Tanner formula for the diffusion-attenuated signal, usually obtained by solving the Bloch-Torrey partial differential equations. Here we derive the Stejskal- Tanner formula in the simplest possible manner, avoiding cumbersome integrals and differential equations. This approach makes it easy to understand the origin of the diffusion signal attenuation, the effects of various diffusion sequence parameters, and also the numerous important pitfalls are discussed. This contribution is based on a mathematical formulation for the analysis of geometry factors in Stejskal-Tanner imaging sequence. Calculations are based on the direct analytical solution of the Bloch NMR flow equations by the method of separation of variable in Cartesian, cylindrical and spherical polar coordinates representing the NMR transverse magnetization. Appropriate mathematical transformations are involved in the resolution algorithm at different stages. The mathematical transformations are introduced based on Bessel and Legendre polynomials.
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    Novel epoxy-carbonized coconut shell nanoparticles composites for car bumper application
    (The International Journal of Advanced Manufacturing Technology, 2018-12-12) Agunsoye, J. O.; Odumosu, A. K.; Dada, O. E.
    The structure and mechanical properties of carbonized coconut shell nanoparticles (CSnp) reinforced epoxy composite have been evaluated to establish the possibility of using the composite as a new material for automobile car bumper application. Epoxy resin of the type LY556 was blended together with CSnp at 5–25 wt%. Scanning electron microscopy (SEM), mechanical test, and thermogravimetric analysis (TGA) were examined. SEMmorphology reveals adhesion between CSnp and polymer matrix at low wt%CSnp while at higher weight percent of CSnp agglomeration of CSnp was observed. The addition of CSnp at 25 wt% produced the optimal hardness values of 26.35 VHN, tensile stress of 338.75 MPa, and flexural strength of 156 MPa, while at 10 wt% CSnp produced optimal impact energy value of 5.71 J. The developed epoxy composite when compared with two existing Toyota models showed improved impact energy at break of 10.5% over Big Daddy Model and 37.45% over Carina model under the same testing conditions.