Crown Ratio Models for Tectona grandis (Linn. f) Stands in Osho Forest Reserve, Oyo State, Nigeria

Popoola F.S.,Adesoye P.O. 강원대학교 산림과학연구소 2012 Journal of Forest Science Vol.28 No.2

Crown ratio is the ratio of live crown length to tree height. It is often used as an important predictor variable for tree growth equation. It indicates tree vigor and is a useful parameter in forest health assessment. The objective of the study was to develop crown ratio prediction models for Tectona grandis. Based on the data set from the temporary sample plots, several non linear equations including logistics, Chapman Richard and exponential functions were tested. These functions were evaluated in terms of coefficient of determination (R2) and standard error of the estimate (SEE). The significance of the estimated parameters was also verified. Plot of residuals against estimated crown ratios were observed. Although the logistic model had the highest R2 and the least SEE, Chapman-Richard and Exponential functions were observed to be more consistent in their predictive ability; and were therefore recommended for predicting crown ratio in the stand.

Teachers’ preparedness for sexuality education in Nigerian secondary schools

Popoola Bayode Isaiah 한국교육개발원 2009 KEDI Journal of Educational Policy Vol.6 No.1

Current educational policy in Nigeria does not provide for the integration of Sexuality Education (SE) into the school curriculum mainly because policy makers do not have reliable data on vital issues such as topic ppropriateness and teachers’ competence/willingness to teach the subject. The study investigated teachers’ perception of appropriate topics for SE and determine their level of preparedness should SE be introduced in schools. In a survey of 612 teachers, it was found that most teachers recommended the teaching of abstinence and relationship skills in secondary schools. Though the teachers supported the introduction of SE, most of them indicated that they would be uncomfortable teaching it. Adequate preparation of teachers was recommended before introducing SE into school curriculum in Nigeria.

Porosimetry and thermal analysis of lateritic clay minerals-Ag-TiO2 nanocomposite as ceramic photocatalyst material

Emmanuel Ajenifuja,Abimbola P I Popoola,Abiodun E Adeoye,Olawale M Popoola 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.1

Silver nanoparticle doped titanium oxide photocatalyst material is intercalated into chemically activated lateritic clay (CLY)minerals using sol-gel technique for the preparation of powder ceramic nanocomposite photocatalyst. The photocatalystnanocomposites were sintered at high temperature to induce thermal reaction and crystalline growth between the constituentsvia Oswald ripening. Physical and thermal characterizations of intercalated (STOX-C) and sintered-intercalated (STOX-CS)samples were studied using BET (N2 adsorption-desorption analysis), differential scanning calorimetry (DSC/DTA), andscanning electron microscopy (SEM). Microstructural examination of Ag-NPs doped TiO2 revealed evenly distributed uniformnanocrystallites after the sol-gel synthesis. The micrograph of the clay mineral samples indicated transition from acombination of rod-like and platelet phases to aggregates of spherical crystallites after intercalation and sintering. The naturalstructure of the clay mineral changed after sol-gel intercalation with Ag-TiO2 nanoparticle. Nitrogen adsorption-desorptionanalysis of the samples revealed that nanoparticle intercalation does not really affect the particle surface area, howeverisothermal sintering after intercalation caused remarkable reduction in crystallites surface area (37.912 m2/g to 8.971 m2/g). Meanwhile, the pore sizes increased after sintering from 17.47 nm to 24.42 nm. Changes from hysteresis loop to a nearreversibleisotherm behaviour were observed after photocatalyst nanoparticle sintering. The thermal analysis revealedtransformation reactions of lateritic mineral influenced by between Ag-TiO2 intercalation.

Occupational Hazards and Safety Measures Amongst the Paint Factory Workers in Lagos, Nigeria

Awodele, Olufunsho,Popoola, Temidayo D.,Ogbudu, Bawo S.,Akinyede, Akin,Coker, Herbert A.B.,Akintonwa, Alade Occupational Safety and Health Research Institute 2014 Safety and health at work Vol.5 No.2

Background: The manufacture of paint involves a variety of processes that present with medical hazards. Safety initiatives are hence introduced to limit hazard exposures and promote workplace safety. This aim of this study is to assess the use of available control measures/initiatives in selected paint factories in Lagos West Senatorial District, Nigeria. Methods: A total of 400 randomly selected paint factory workers were involved in the study. A well-structured World Health Organization standard questionnaire was designed and distributed to the workers to elicit information on awareness to occupational hazards, use of personal protective devices, and commonly experienced adverse symptoms. Urine samples were obtained from 50 workers randomly selected from these 400 participants, and the concentrations of the heavy metals (lead, cadmium, arsenic, and chromium) were determined using atomic absorption spectroscopy. Results: The results show that 72.5% of the respondents are aware of the hazards associated with their jobs; 30% have had formal training on hazards and safety measures; 40% do not use personal protective devices, and 90% of the respondents reported symptoms relating to hazard exposure. There was a statistically significant (p < 0.05) increase in the mean heavy metal concentrations in the urine samples obtained from paint factory workers as compared with nonfactory workers. Conclusion: The need to develop effective frameworks that will initiate the integration and ensure implementation of safety regulations in paint factories is evident. Where these exist, there is a need to promote adherence to these practice guidelines.

Characterization and Corrosion Behaviour of Zn-Sn Binary Alloy Coatings in 0.5 M H₂SO₄ Solution

Fatoba, O.S.,Popoola, A.P.I.,Fedotova, T. The Korean Electrochemical Society 2015 Journal of electrochemical science and technology Vol.6 No.2

This work examines the characterization and corrosion behaviour of laser alloyed UNSG10150 steel with three different premixed composition Zn-Sn binary powders using a 4.4 kW continuous wave (CW) Rofin Sinar Nd:YAG laser processing system. The steel alloyed samples were cut to corrosion coupons, immersed in sulphuric acid (0.5 M H₂SO₄) solution at 30℃ using electrochemical technique and investigated for its corrosion behaviour. The morphologies and microstructures of the developed coated and uncoated samples were characterized by Optic Nikon Optical microscope (OPM) and scanning electron microscope (SEM/EDS). Moreover, X-ray diffractometer (XRD) was used to identify the phases present. An enhancement of 2.7-times the hardness of the steel substrate was achieved in sample A₁ which may be attributed to the fine microstructure, dislocations and the high degree of saturation of solid solution brought by the high scanning speed. At scanning speed of 0.8 m/min, sample A₁ exhibited the highest polarization resistance R_p (1081678 Ωcm² ), lowest corrosion current density i_corr (4.81×10⁻⁸A/cm² ), and lowest corrosion rate Cr (0.0005 mm/year) in 0.5 M H₂SO₄. The polarization resistance R_p (1081678 Ωcm² ) is 67,813-times the polarization of the UNSG10150 substrate and 99.9972% reduction in the corrosion rate.

Occupational Hazards and Safety Measures Amongst the Paint Factory Workers in Lagos, Nigeria

Olufunsho Awodele,Temidayo D. Popoola,Bawo S. Ogbudu,Akin Akinyede,Herbert A.B. Coker,Alade Akintonwa 한국산업안전보건공단 산업안전보건연구원 2014 Safety and health at work Vol.5 No.2

Background: The manufacture of paint involves a variety of processes that present with medical hazards. Safety initiatives are hence introduced to limit hazard exposures and promote workplace safety. This aim of this study is to assess the use of available control measures/initiatives in selected paint factories in Lagos West Senatorial District, Nigeria. Methods: A total of 400 randomly selected paint factory workers were involved in the study. A wellstructured World Health Organization standard questionnaire was designed and distributed to the workers to elicit information on awareness to occupational hazards, use of personal protective devices, and commonly experienced adverse symptoms. Urine samples were obtained from 50 workers randomly selected from these 400 participants, and the concentrations of the heavy metals (lead, cadmium, arsenic, and chromium) were determined using atomic absorption spectroscopy. Results: The results show that 72.5% of the respondents are aware of the hazards associated with their jobs; 30% have had formal training on hazards and safety measures; 40% do not use personal protective devices, and 90% of the respondents reported symptoms relating to hazard exposure. There was a statistically significant (p < 0.05) increase in the mean heavy metal concentrations in the urine samples obtained from paint factory workers as compared with nonfactory workers. Conclusion: The need to develop effective frameworks that will initiate the integration and ensure implementation of safety regulations in paint factories is evident. Where these exist, there is a need to promote adherence to these practice guidelines.

Organizational Culture And Emotional Intelligence As Predictors Of Job Performance Among Library Personnel In Academic Libraries In Edo State, Nigeria

Igbinovia, Magnus O.,Popoola, S.O. Korea Institute of Science and Technology Informat 2016 Journal of Information Science Theory and Practice Vol.4 No.2

This study was designed to investigate organizational culture and emotional intelligence as predictors of job performance among library personnel in Edo state, Nigeria. The survey research design was employed for the study with a population size of 181 library personnel in the 15 academic libraries under study, and due to the manageable population size, total enumeration was adopted as the sampling technique. The questionnaire was used to elicit data from the respondents. Of the 181 copies of the questionnaire administered, 163 copies were retrieved and found valid for analysis constituting a 90% response rate. Four research questions and four null hypotheses (tested at 0.05 level of significance) were formulated to guide the study. The tool used to analyze the research question was descriptive statistics (percentage, mean, and standard deviation) and inferential statistics (correlation and multiple regression) for testing the hypotheses. The findings of the study revealed that there is a high level of job performance, good organizational culture, and high level of emotional intelligence among the personnel. Organizational culture and emotional intelligence jointly and significantly predict job performance of personnel. There is significant positive correlation between organizational culture and job performance. The linear combination of emotional intelligence and organizational culture predict job performance of library personnel in the academic libraries under study. The research concludes that there is a need for high job performance in libraries which is predicted by the organizational culture of the library and the level of emotional intelligence of the library personnel.

Molecular analysis of bacterial community dynamics during the fermentation of soy-daddawa condiment

Ezeokoli, Obinna,Gupta, Arvind,Popoola, Temitope,Bezuidenhout, Cornelius 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.4

Bacterial community dynamics during soy-daddawa fermentation was investigated using culture-dependent and PCR-denaturing gradient gel electrophoresis (PCR-DGGE) molecular methods. The total titratable acidity (TTA), pH, and bacterial counts (BCs) were monitored daily during a 72-h fermentation period. Bacteria were characterized based on 16S rRNA gene sequencing. TTA ranged from 0.08 to 0.26 mg lactic acid/g, whereas pH ranged from 7.01 to 8.19. BCs increased from 3.9 to 10.61 log CFU/g. Fifty-eight isolates were obtained by culture method and clustered into seven operational taxonomic units (OTUs) at 97% sequence similarity, whereas four OTUs were obtained from the PCR-DGGE method. Taxonomic identification revealed that bacteria belonged to the genera Bacillus, Enterobacter, Enterococcus, and Staphylococcus with B. subtilis being present throughout fermentation. Medically significant isolates, including B. anthracis, Enterococcus casseliflavus, and Enterobacter hormaechei were detected. These results emphasize the need for starter culture utilization and offer a platform for starter culture screening and selection.

Economic Analysis of Growing Ginger (Zingiber officinale) Under Teak (Tectona grandis) Canopy in Southwest Nigeria

Adekunle Tajudeen Oladele,Labode Popoola 강원대학교 산림과학연구소 2013 Journal of Forest Science Vol.29 No.2

Multiple use forestry is capable of generating income for forest based communities through Non- Timber forest products (NTFPs) which provide food, medicine, materials for domestic use and cash income for communities adjoining forest areas in developing countries. This study evaluates the economics of producing ginger rhizomes under teak canopy in a multiple land use system during 2007 and 2008 in even aged teak plantations in Ibadan and Ife, Nigeria. Twelve 6 m2 sample plots were randomly selected in Completely Randomized Block Design within and outside the plantation. Average ginger rhizome of (50-60 g) were planted on the slightly tilled soil. NPK 15:15:15 was applied at 180 kg/ha on a split unit dose. ANOVA, Profitability, Benefit-Cost (B/C) ratio were used to analyze data. Results showed no significant differences between sites in ginger rhizome yield, (0.089 and 0.718, ρ≤0.05) in 2007 and 2008 respectively. Average yield were higher outside teak canopy in both sites and treatments, (Ibadan -40.05 g>32.9 g, Ife -67.6 g>25.2 g and Ibadan -41.3 g>31.5 g, Ife -66.8 g>25.0 g) with and without NPK respectively. NPK had no effect on yields within teak plantation, (Ibadan -31.5<32.9 g, Ife -25 g<25.2 g). Ginger rhizome production was viable financially without inorganic fertilizer during second cropping season within and outside plantation (B/C=1.02, 1.09) respectively. Ginger could be raised profitably under teak canopy, however, studies on insolation requirement of ginger under teak canopy and other tree plantations are recommended.

Economic Analysis of Growing Ginger (Zingiber officinale) Under Teak (Tectona grandis) Canopy in Southwest Nigeria

Oladele, Adekunle Tajudeen,Popoola, Labode Institute of Forest Science 2013 Journal of Forest Science Vol.29 No.2

Multiple use forestry is capable of generating income for forest based communities through Non-Timber forest products (NTFPs) which provide food, medicine, materials for domestic use and cash income for communities adjoining forest areas in developing countries. This study evaluates the economics of producing ginger rhizomes under teak canopy in a multiple land use system during 2007 and 2008 in even aged teak plantations in Ibadan and Ife, Nigeria. Twelve $6m^2$ sample plots were randomly selected in Completely Randomized Block Design within and outside the plantation. Average ginger rhizome of (50-60 g) were planted on the slightly tilled soil. NPK 15:15:15 was applied at 180 kg/ha on a split unit dose. ANOVA, Profitability, Benefit-Cost (B/C) ratio were used to analyze data. Results showed no significant differences between sites in ginger rhizome yield, (0.089 and 0.718, ${\rho}{\leq}0.05$) in 2007 and 2008 respectively. Average yield were higher outside teak canopy in both sites and treatments, (Ibadan -40.05 g>32.9 g, Ife -67.6 g>25.2 g and Ibadan -41.3 g>31.5 g, Ife -66.8 g>25.0 g) with and without NPK respectively. NPK had no effect on yields within teak plantation, (Ibadan -31.5<32.9 g, Ife -25 g<25.2 g). Ginger rhizome production was viable financially without inorganic fertilizer during second cropping season within and outside plantation (B/C=1.02, 1.09) respectively. Ginger could be raised profitably under teak canopy, however, studies on insolation requirement of ginger under teak canopy and other tree plantations are recommended.