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Azeez, L.,Oyedeji, O.A.,Abdulsalami, I.O.,Adewuyi, S.O. Techno-Press 2013 Advances in environmental research Vol.2 No.2
This study investigated the concentrations of odourous compounds in air, leachate, stream and well in and around Taju-Bello dumpsite. Meteorological parameters (temperature, relative humidity, wind velocity) and six odour families comprising sulphur ($H_2S$), ammonia ($NH_3$), aromatic (benzene, toluene, ethylbenzene, styrene, p-xylene, m-xylene), aliphatic (hexane), oxygenated (formaldehyde, acetaldehyde) and halogenated (tetrachloroethene, trichloroethene, carbontetrachloride) compounds were measured. Meteorological parameters suggested low dispersal of pollutants at L1 with possible perspiration and suffocation from exposure to high temperature, relative humidity and low wind velocity. The trend of abundance of odourous compounds at studied locations is of the order dumpsite (L1) > leachate (L4) > 100 m away from dumpsite (L2) > 200 m away from dumpsite (L3) > stream (L5) > well (L6). $H_2S$, Oxygenated and aromatic compounds were the major contributors to odour strength in these locations. Correlation, factor and cluster analyses of the data revealed similarities of sources as biogenics and xenobiotics inherent in the wastes as the main sources of these odourous compounds.
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Abifarin Johnson Kehinde,Abifarin Fredah Batale,Oyedeji Elijah Oyewusi,Prakash Chander,Zahedi S. Abolfazl 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.6
In this research, Taguchi–grey relational analysis has been applied to mitigate the insufficient assumptions made on the optimization of mechanical and structural (mechanostructural) properties of synthesized hydroxyapatite (HAp)–alumina–titanium nanocomposite. This nanocomposite has already been developed and studied in the previous study. This paper employs the L9 (3**3) orthogonal array, including displaying factors and levels of 3, 5, 7 wt % for alumina, 5, 10, 15 wt % for titanium, and 1100, 1150, 1200 °C sintering temperature. The computational analysis presents the predicted mechanostructural grey relational response as 0.7271, higher than the highest response shown in the ninth experimental run. The optimal control factors are analyzed to be 7 wt % alumina, 15 wt % titanium, and 1200 °C sintering temperature. The obtained result elucidates the hypothesis that a singular response optimization is not enough in the fabrication of biomedical material, disproving the assumption made in the previous literature. Importantly, to fabricate a high clinical grade HAp–alumina–titanium nanocomposite, titanium is the most invaluable contributor with a contribution of 49.11%, followed by alumina (45.52%), and then sintering temperature (3.2%). Although the confidence level and probability distribution analysis show that all the experimental mechanostructural responses were within the 95% confidence level, the employment of the predicted optimal factors is strongly recommended for experimentation.
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Animasaun, David Adedayo,Afeez, Azeez,Adedibu, Peter Adeolu,Akande, Feyisayo Priscilla,Oyedeji, Stephen,Olorunmaiye, Kehinde Stephen The Korean Society of Plant Biotechnology 2020 JOURNAL OF PLANT BIOTECHNOLOGY Vol.47 No.4
Genetic diversity among Thaumatococcus daniellii populations in the southwestern region of Nigeria were assessed using morphometric and molecular markers to determine the population structure and existing genetic relationship for its improvement, conservation and sustainable utilisation. Populations from five locations in each of the six states were used for the study. Morphometric data were collected on folia characters and analysed for variability. Genome DNA was isolated from the plant leaf and amplified by polymerase chain reaction with inter-simple sequence repeat markers (ISSR) to determine the allelic polymorphism, marker effectiveness and genetic relationship of the population. The results showed significant variations in petiole length and leaf dimensions of the populations within and across the states. These morphometric traits are the major parameters that delimit the populations and they correlated significantly at P≤0.05. Analysis of the electrophoregram showed that the ISSR markers are effective for the diversity study. A total of 136 loci were amplified with an average of 7.16 loci per marker, 63.2% of the loci were polymorphic. The Principal Coordinate Analysis revealed that seven factors accounted for 81.6% of the variation and the dendrogram separated the populations into two major groups at a genetic distance of 10 (about 90% similarity) with sub-groups and clusters. Most populations within the state had a high degree of similarity, nonetheless, strong genetic relationship exists among populations from different states. The close relationship between populations across the states suggests a common progenitor, which are likely separated by ecological or geographical isolation mechanisms.
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Mechanical behaviour of porous kaolin-based ceramics for potential catalysts support applications
Obada David O.,Salami Kazeem A.,Alabi Abdulmumin A.,Oyedeji Ayodeji N.,Csaki Stefan,Hulan Tomáš,Meher Alok K. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
In this study, porous kaolin-based ceramic support materials were successfully fabricated using conventional sintering techniques. The support materials were prepared using two different weight per cent (wt.%) of sawdust addition (10–20 wt.%), compacted at 10–20 MPa and sintered at 900 and 1000 °C. The physical and mechanical properties of the support materials as formed by sintering were examined, while the failure rate of the fabricated support materials was determined using Weibull statistical tool. The experimental data show that the best result for the hardness and fracture toughness was obtained as 0.409 GPa and 0.835 MPa·m1/2 for supports sintered at 1000 °C with 20 wt. % pore formers. The mass loss for the support materials with the best properties was reported to be about 5%, making the support a potential material for use as catalyst support. The Weibull modulus (m) obtained for the ceramic support was in a range of 2.75–4.00, indicating that the samples had a lower failure rate than most ceramic support materials with a Weibull modulus of more than 6. The control samples and samples with the inclusion of pore formers demonstrated acoustic emission (AE) response during the entire cooling process during the acoustic emission test.
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