OALib Journal期刊

ISSN: 2333-9721




2020 ( 5 )

2019 ( 26 )

2018 ( 27 )

2017 ( 32 )


匹配條件: “ Mary Omowumi Oluwole” ,找到相關結果約5753條。
Socio-Economic Characters and Activities of Support Zone Communities in Gashaka Gumti National Park  [PDF]
Zacharia Buba Yaduma, Joyrose Enebuse Adaeze, Mary Omowumi Oluwole, Bijida Zacharia
Open Access Library Journal (OALib Journal) , 2020, DOI: 10.4236/oalib.1106200
Abstract: The study was conducted at Gashaka Gumti National Park to determine socio-economic activities and their relationship with the forest. The Result obtained shows that, the age of the respondents was presented in Table 1. The pooled result indicated that there were 29.82%, for the age class of 36 - 45 years, 28.77%, for the age class of 26 - 35, 20.35%, for the age class of 15 - 25; 13.68%, for the age class of 46 - 55; and 7.37% for the age class of 56 years and above. The result on gender indicated that Males were 75.78%, while female was 24.21%, of the population. The result of marital status revealed that married respondents recorded 58.24%; singles had 29.82% while the widows recorded 11.93%. The results of the family size indicated that the family size of 10 - 14 recorded 37.54%; 5 - 9 family size had 22.46%; 15 - 19 recorded 20.70%; 1 - 4 had 11.23% while 20 and above recorded 8.07%. The result of occupation of the respondent indicated that farmers/grazers recorded 44.91%; business men/women were 18.59%; public servants recorded 14.74%, students were 12.98%, while house wives/widows recorded 8.77%. The educational qualification of the respondents revealed that non formal education recorded 37.89%, primary education recorded 21.40%, adult education, had 15.78%, and post primary education recorded 15.78% while tertiary education had 9.12%. The result of income level of the respondents revealed that N30,000 - N39,000 had 34.38%, N20,000 - N29,000 recorded 23.86%, N10,000 - N19,000, had 23.16%, N40,000 - N 49,000, had 10.88% and N50,000 and above recorded 7.72%. The research reviles that the greater are still in their early forties, but the level of education was lower among the population and which may be the result of the lower income among the population; of which it may have a negative impact on the survival of the forest and its biodiversity. Therefore, more income and better education may help in maintaining a balanced relationship between the population and its environs.
Effects of Planting Methods and Seed Density on Vegetable Yield and Nutrient Composition of Solanum macrocarpon and Solanum scabrum in Southwest Nigeria  [PDF]
Mary K. Idowu, Durodoluwa J. Oyedele, Ojo Kolawole Adekunle, Oluwole Olalekan Akinremi, Bob Eilers
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.513129

Two field studies were carried out using Solanum macrocarpon and Solanum scabrum to investigate the effects of planting methods and seed density required for optimum biomass yield and nutrient content in southwest Nigeria. Two planting methods (drilling and broadcasting), and two seed densities (4 and 8 table spoon full) were investigated as a 2×2×3 factorial experiment in randomized complete block design and replicated three times. Four seed spoons gave 25.78 kg seeds ha-1 for S. macrocarpon and 20.67 kg·seeds·ha-1 for S. scabrum. Significant highest S. macrocarpon shoots (2.75 kg·m-2) and Ca, K, Fe and Zn contents and S. scabrum (2.95 kg·m-2) and Zn content, were obtained with drilling and four spoons of seeds compared with broadcasting and 8 spoons of seeds. This treatment gave average values for N, P, K, Mg, Ca, Na, Fe, Zn, Mn, Cu, Ca/P and Na/K ratio were 2.79%, 0.03%, 3.37%, 1.64%, 0.02%, 300 mg·kg-1, 100 mg·kg-1, 300 mg·kg-1, 8 mg·kg-1, 1.22 and 0.008 for S. macrocarpon and 2.05%, 0.27%, 5.81%, 3.27%, 2.91%, 0.09%, 280 mg·kg-1, 52.99 mg·kg-1, 359.35 mg·kg-1 and 22.42 mg·kg-1, 11.63 and 0.016 for S. scabrum. It was concluded that planting in drilling made weeding, fertilizer application, irrigation and harvesting more effective rather than by broadcasting, and four spoons of seeds per 9 m-2 produced deep green and broader leaves and balanced nutrient contents than eight spoons of seeds.

Electrical resistivity imaging survey for shallow site investigation at University of Ibadan campus, south-western Nigeria
Oluwafemi Omowumi
Journal of Engineering and Applied Sciences , 2012,
Abstract: A geo-electrical imaging survey was conducted at Abadina area of University of Ibadan, Ibadan, Southwestern Nigeria for shallow site investigation in order to determine the applicability of 2-D resistivity imaging in studying the weathered profile, which in turn determines how feasible the area would be in terms of erection of structures that will stand the test of time. The area is underlain mainly by augen gneiss with minor intrusion of dolerite dyke. Geophysical survey was carried out using 2-D electrical resistivity imaging technique. The Wenner array was employed. Field data were obtained for eight electrical imaging lines. The field data was subjected to inversion in order to remove geometrical effects from the pseudosection and produce an image of true depth and true formation resistivity. This layer has a range of resistivity from 10 to 100 Ohm-m. Partially weathered basement were observed on some of the traverses with relatively high resistivity anomalies. The image lines depict clearly that the subsurface material differs in terms of their competence. This is reflected in the weathering pattern where part of the image line was showing deeply weathered material towards one side whereas the other side is showing very shallow overburden at less than 2 m. In conclusion, site investigation using 2-D electrical resistivity imaging is an essential step to be taken before the erection of any structure for minimum damage because a balanced interaction of soil and structure is the hall-mark of a successful design of foundation. Further studies such as soil test should be carried out to ascertain the suitability of the soil for future planning of the site.
Engineering Research for Self-Reliance-Modeling and Simulation Perspective  [PDF]
O. Oluwole
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.82010
Abstract: Engineering research is a sine-qua-non for development of new products, new production processes, hence production lines in the quest for self reliance in any economy. Modeling and simulation is a veritable tool for such research and development. This paper presents the multifaceted use of modeling and simulation as decision tools for engineering facet of an economy drawing examples from two different engineering disciplines- Metallurgical and Civil.
Regulatory effect of heat shock protein 70 in stress-induced rat intestinal epithelial barrier dysfunction
Ping-Chang Yang,Ya-Hong Tu,Mary H. Perdue,Christine Oluwole
North American Journal of Medical Sciences , 2009,
Abstract: Background: Psychological stress is one of the factors associated with many human diseases; the mechanisms need to be further understood. Methods: Rats were subjected to chronic water avoid stress. Intestinal epithelial heat shock protein (HSP) 70 was evaluated. The intestinal epithelial permeability was examined with Ussing chamber technique. Results: HSP70 was detected in normal intestinal epithelial cells. Psychological stress decreased HSP70 in the intestinal epithelial cells that correlated with the stress-induced intestinal epithelial hyperpermeability. Pretreatment with HSP70 abrogated stress-induced intestinal barrier dysfunction. Conclusions: Chronic stress inhibits HSP70 activity in rat intestinal epithelial layer that is associated with intestinal epithelial barrier dysfunction, which can be prevented by pretreatment with HSP70 protein.
Mast cells modulate transport of CD23/IgE/antigen complex across human intestinal epithelial barrier
Ya-Hong Tu,Christine Oluwole,Stevie Struiksma,Mary H. Perdue
North American Journal of Medical Sciences , 2009,
Abstract: Background: Food allergy and chronic intestinal inflammation are common in western countries. The complex of antigen/IgE is taken up into the body from the gut lumen with the aid of epithelial cell-derived CD23 (low affinity IgE receptor II) that plays an important role in the pathogenesis of intestinal allergy. This study aimed to elucidate the role of mast cell on modulation of antigen/IgE complex transport across intestinal epithelial barrier. Methods: Human intestinal epithelial cell line HT29 cell monolayer was used as a study platform. Transepithelial electric resistance (TER) and permeability to ovalbumin (OVA) were used as the markers of intestinal epithelial barrier function that were recorded in response to the stimulation of mast cell-derived chemical mediators. Results: Conditioned media from na ve mast cell line HMC-1 cells or monocyte cell line THP-1 cells significantly upregulated the expression of CD23 and increased the antigen transport across the epithelium. Treatment with stem cell factor (SCF), nerve growth factor (NGF), retinoic acid (RA) or dimethyl sulphoxide (DMSO) enhanced CD23 expression in HT29 cells. Conditioned media from SCF, NGF or RA-treated HMC-1 cells, and SCF, NGF, DMSO or RA-treated THP-1 cells enhanced immune complex transport via enhancing the expression of the CD23 in HT29 cells and the release of inflammatory mediator TNF-α. Nuclear factor kappa B inhibitor, tryptase and TNF-α inhibited the increase in CD23 in HT29 cells and prevents the enhancement of epithelial barrier permeability. Conclusions: Mast cells play an important role in modulating the intestinal CD23 expression and the transport of antigen/IgE/CD23 complex across epithelial barrier.
Finite Element Modelling of Insulation Thicknesses for Cryogenic Products in Spherical Storage Pressure Vessels  [PDF]
Oludele Adeyefa, Oluleke Oluwole
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.46042
Abstract: This study investigates various insulation thicknesses requirements for double-walled spherical pressure vessels for the storage of cryogenic liquids. The inner tank is suspended from the outer tank by straps or cables and the annular space between the tanks is filled with insulation. The outer tank is not subjected to the freezing temperatures and is thus assumed to be a standard carbon steel sphere. In the Finite Element Analysis model of the system, one dimensional analysis was employed. This is due to the assumption that temperature gradient does only exist along the spherical radial direction. In the developed model, once the thickness of the inner shell has been determined based on relevant standards and codes—ASME Sec VIII Div 1 or 2, BS 5500 etc and the thickness of the outer shell is known; the required insulation material thicknesses were calculated for different insulating materials. Set of equations resulting from Finite Element Analysis were solved with computer programme code which was written in FORTRAN 90 programming language. The results obtained are validated by analytical method. The results showed no significant difference (P > 0.05) with values obtained through analytical method. The thicknesses for different insulating materials in-between inner and outer tank shells were compared. The results showed that as the insulating material thickness was increased, the heat flux into the stored product was decreasing and at a certain thickness; it started increasing. The insulating thickness at which this happens is termed as critical thickness of insulating material—the thickness of insulation at which the heat influx to the stored products is minimal; this would therefore reduce boil-off of the stored cryogenic product. High thermal conductivity insulating materials need to be thicker than lower thermal conductivity insulating materials if the system is conditioned to have the same heat flux into the stored product for all insulating materials. In the simulation, different insulating material gives different minimal heat influx into the stored products.
Finite Element Analysis of In-Plane Displacements and Von-Mises Stresses in Ellipsoidal and Circular Cylinderical Petroleum Tankers  [PDF]
Oluleke Oluwole, Eyere Emagbetere
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.52024
Abstract: Road tankers are the most used means of transporting petroleum product to end users due to its cost effectiveness and energy-efficiency. The cylindrical tank has been well designed for by ASME VIII divisions 1 and 2 using analytical equations. Petrol tankers are not circular but elliptical probably for stability during transportation. This paper has used the finite element method to investigate in-plane displacements and Von-Mises stresses in both circular and elliptical cylindrical tanks under full loading. An elliptical OANDO? tanker of 66.78 m3volume and shell thickness of0.2 mmand an equivalent volume circular cylindrical tank was used for the simulation. MATLAB? was used to generate geometrical mesh model of the petroleum tankers, extract element coordinates and conduct the finite element analysis. Plane strain condition was used in analyzing a section of the petroleum tanker. It was observed that an equivalent volume circular cylindrical tank was under a higher internal pressure (16,858 N/m2) compared to the elliptical cylinder (14,480 N/m2). Von-Mises stress and in-plane displacements showed direct linear relationships with internal fluid pressure. Von-Mises stress in the elliptical tank was found to be lower (5.7 × 106 N/m2) than for the circular tank (8 × 106 N/m2). In plane displacements was zero in the longitudinal direction for both tanks and of the order of 10-4 mm in the y-direction for both tanks with the circular larger by about 2.5 × 10-3 cm. So in addition to tank stability on the lorry, the Von-Mises stresses were lower as well for the elliptical tank. It was also observed that Von-Mises stresses were far below the yield stress of the steel plate. However, the effect of weldment area on lowering of yield stress was not studied. Stress values were validated using analytical method and found to be insignificantly different (P > 0.05).
Finite Element Modeling of Seismic Response of Field Fabricated Liquefied Natural Gas (LNG) Spherical Storage Vessels  [PDF]
Oludele Adeyefa, Oluleke Oluwole
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.56065
Abstract: All real physical structures behave dynamically when subjected to loads or displacements. This research paper, therefore, presents seismic response of field fabricated liquefied natural gas spherical storage vessels using finite element analysis. The seismic analysis procedure used represents a practical approach in quantifying the response of spherical storage vessel with its content when it is subjected to seismic loading. In the finite element method approach, six degrees of freedom per node is used for legs/column of the spherical storage tanks. Lumped mass procedure is employed to determine system mass matrix of the structure. Computer programme code is developed for the resulting matrix equation form finite element analysis of the structure using FORTRAN 90 programming language. The modeling of the seismic load utilizes the ground acceleration curve of a site. From the results of the modal analysis, the system is uncoupled thereby gives way to the application of Newmark’s method. Newmark’s method as one of the widely used time-step approach for the seismic response is applied. The developed programme coding is validated with analytical results (P > 0.5). It shows that the approach in this research work can be successfully used in determine the stability of large spherical storage vessels against seismic loadings when base acceleration spectral of the site are known. This approach gives better results than the static-force approach which gives conservative results. While the approach used in this research treats seismic loads as time event, static-force approach assumed that the full ground force due to seismic motion is applied instantaneously.
Finite Element Modeling of Shop Built Spherical Pressure Vessels  [PDF]
Oludele Adeyefa, Oluleke Oluwole
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.56064
Abstract: This work builds on an earlier work done which used global coordinates where a large number of elements were needed to form a convergence of results for shop built spherical pressure vessels. In this work area coordinates were used. Any action that leads to an inability on the part of a structure to function as intended is known as failure. This research, therefore, investigates stresses developed in a shop built carbon steel spherical storage vessels using finite element approach as the analytical tool. 3-D finite element modeling using 3-node shallow triangular element with five degrees of freedom at each node is employed. These five degrees of freedom are the essential nodal degrees of freedom without the sixth in-plane rotation. The resulting equations from finite element analysis are coded using FORTRAN 90 computer programme. Spherical storage vessels are subjected to various internal loading pressures while nodal displacements, strains and the corresponding maximum Von-mises stresses are determined. The calculated maximum Vonmises stresses are compared with the yield strength of the shell plate material. Using specified safety factor, safety internal pressures with the corresponding shell thicknesses for shop built spherical pressure vessels are determined. The finite element modeling carried out in this research can be used to predict in-service stresses, strains, and deformations of shop built spherical pressure vessels using Von-mises yield stress as the failure criteria. The results obtained were validated by analytical method and it showed there was no significant difference (P > 0.05) with values obtained through analytical method.

Copyright ? 2008-2017 Open Access Library. All rights reserved.