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Analysis of Vertical Profiles of Precipitable Liquid Water Content in a Tropical Climate Using Micro Rain Radar

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Journal of Geoscience and Environment Protection 2019年第2期7卷 140-155页

作者： Joseph S. ojo Omololu O. Daodu olalekan L. ojo Department of Physics Federal University of Technology Akure Nigeria Department of Physics Elizade University Ilara-Mokin Nigeria

In this paper, some distinctive features of the vertical profile of precipitable liquid water content (LWC) with considerable respect to rain rates (R) and radar reflectivity (Z) obtained in a tropical location are presented. Assessment of LWC allows applications in the specific area of flight icing severity, aviation safety as well as signals traversing through the atmosphere. The parameters were typically measured using vertically-pointing Micro Rain Radar (MRR) over a period of 2 years (2011-2012) at Akure, a tropical location of Nigeria. The radar scanned at every 10 seconds and integrated over one minute samples to reduce event logging error associated with the instrument. The vertical profile of the LWC typically reveals a prominent seasonal variation. However, majority of the LWC profiles has low LWC, less than 0.1 gm?3 while the maximum observed LWC is about 3.18 gm?3. A strong like hood relation was observed between the melting layer height and the LWC, with the LWC reaches peak at the considerable height of about 4160 m which coincides precisely with the freezing height level (rain height of ~4520 m) of the study location. Good correlation was also observed between the LWC and R in most of the heights considered. The results obtained will assist system engineers to assess the level of absorption, reflection and attenuation of electromagnetic signals as a result of precipitable LWC along the transmitting paths. The novelty of the present work is in the area of linking LWC and Z as against usual relation between Z and R.

关键词： Liquid Water Content Micro Rain Radar Vertical Profile Tropical Climate Radar Reflectivity Factor

Comparison of Thickness and Depth Resolution Power of Wenner and Schlumberger Arrays: A Case Study of Temidire Quarters, Akure, Nigeria

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Journal of Geoscience and Environment Protection 2017年第3期5卷 233-239页

作者： Igbagbo Adedotun Adeyemo Bosede Taiwo ojo Wasiu olalekan Raheem Department of Applied Geophysics Federal University of Technology Akure Nigeria

An electrical resistivity sounding investigation was carried out within the vicinity of some hand dug wells at Temidire Quarters in Akure, Ondo State, Nigeria. The aim of this study was to compare depth and thickness resolution power of Schlumberger and Wenner arrays. The investigation involved twenty-four vertical electrical soundings (VES) which consisted of twelve Schlumberger array VES and twelve Wenner array VES. The VES results delineated geoelectric layers beneath each VES locations, their layer resistivities, layer thicknesses and depth to aquifer layer(s). Depth to aquifer layer was also determined from static water level measurement and this aided the aquifer layer delineation from VES results. The geoelectric sounding results showed that the study area is dominated by a KH-curve type which consists of top soil, clay/weathered layer, fractured basement and fresh basement. Results from both Schlumberger and Wenner array data were correlated with the static water level measurement;Schlumberger array was found to have higher correlation value than Wenner array.

关键词： Vertical Electrical Sounding (VES) Wenner Array Schlumberger Array Static Water Level Correlation

Plantar Cornu Cutaneum Associated with Cutaneous Myxoma

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Surgical Science 2011年第1期2卷 13-15页

作者： olugbenga ojo Oludiran Victor James Ekanem Phillip Felix Umebese 不详

Cutaneous horns are rare in black patients probably as a result of the rarity of sun induced associated skin lesions. However reports of these lesions are filtering in from Africa. In this paper we report an unusual case on the sole of the foot in a native African from Nigeria. This is probably the first documentation of the lesion on the sole of the foot in the world literature.

关键词： Horn Cutaneous Horn Cornu Cutaneum

Effects of Planting Methods and Seed Density on Vegetable Yield and Nutrient Composition of <i>Solanum macrocarpon</i>and <i>Solanum scabrum</i>in Southwest Nigeria

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Food and Nutrition Sciences 2014年第13期5卷 1185-1195页

作者： Mary K. Idowu Durodoluwa J. Oyedele ojo Kolawole Adekunle Oluwole olalekan Akinremi Bob Eilers Department of Crop Production and Protection Faculty of Agriculture Obafemi Awolowo University Ile-Ife Nigeria Department of Soil Science and Land Resources Management Faculty of Agriculture Obafemi Awolowo University Ile-Ife Nigeria Department of Soil Science University of Manitoba Winnipeg Canada

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.

关键词： Solanum macrocarpon Solanum scabrum Planting Method Seed Density and Nutrient Contents

Bradyarrythmias: A Study of Anthropometric, Demographic and Comorbidity Profiles in an African Population

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World Journal of Cardiovascular Surgery 2013年第7期3卷 209-214页

作者： Martins Oluwafemi Thomas Ezekiel O. Ogunleye olugbenga O. Olusoji Augustin Olugbemi O. O. ojo Cardiothoracic Surgery Unit Lagos University Teaching Hospital Lagos Nigeria College of Medicine of University of Lagos-Idiaraba Lagos Nigeria

Background: Bradyarrhythmias are a group of cardiac rhythm disorders that are characterized by bradycardia and they are cosmopolitan in distribution. Their demographic, anthropometric and comorbidity attributes are yet to be clearly established in Africa. Aims and Objectives: This study was conducted to determine the anthropometric, demographic and comorbidity factors in an African population. Methods: We got data from two groups of patients—Group A were bradyarrhythmia patients who already had permanent pacemaker insertion (PPI). Group B were non-cardiac non-debilitated patients of similar age bracket. The sample population consisted of referrals received via clinics, admission through the emergency centres and wards. Their bio-data, hospital identification numbers, ages and gender and other relevant parameters were carefully documented. The ensuing data was analyzed with SPSS 21 statistical software. Results: There were 31 patients in group A (17 male and 14 female patients) and 36 in group B (22 male and 14 female patients). They were all above 20 years of age. Group A had a mean age of 65.8 ± 4.76 years while group B had a mean age of 62.2 ± 4.47 years. Body Mass Index (BMI ≥ 25 Kg·m-2), elevated BP, and diabetes mellitus were important clinical attributes of bradyarrhythmias in the studied group. Discussion and Conclusion: Our study showed that the stated anthropometric, demographic and comorbidity parameters are important attributes for bradyarrhythmias in African population.

关键词： Bradyarrhythmias Anthropometry Demography Comorbidity

Evaluation of Effects of Synthetic Compound and Mineral Admixture on Crystal Structure of Concrete

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Journal of Minerals and Materials Characterization and Engineering 2015年第3期3卷 134-141页

作者： Samuel Oloruntoba olugbenga Olusunle Theresa Chikwuo Ezenwafor Bidemi Sikirat Jiddah-Kazeem Akeem Kareem ojo Jeremiah Akinribide Adekunle Taofeek Oyelami Engineering Materials Development Institute Akure Nigeria

The effects of mineral admixture on the internal morphology of concrete were studied and evaluated in this work. Portland cement with five different additives was used in the complex admixture. These includes: extracted silica from corn hob ash, synthetic calcium carbonate, synthetic calcium hydrogen carbonate, white and dark kaolin, each replacing 10% of cement in the concrete formulation. The additives and the pure cements were subjected to intensive mixing to ensure homogeneity prior to water addition, after which each undergoes casting and curing. Elemental characterizations of the additives indicated the presence of some elemental oxides and crystallography studies were carried out on the pure and reinforced concrete. The obtained result indicated crystallographic adjustments of the indigenous concrete which will definitely contribute to modifying its mechanical properties.

关键词： Synthetic Carbonates Crystallography Elemental Characterization

Effect of Organic Waste on Crystal Structure and Mechanical Properties of Concrete

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Journal of Minerals and Materials Characterization and Engineering 2015年第5期3卷 427-434页

The influence of organic waste as an additive to concrete formulation has been studied by replacing up to 10% of cement ratio with locally sourced organic additive. The reference cement used was Portland cement;three different organic wastes were used in the mixture: periwinkle shell, extracted silica from corn hob ash and coconut shell ash. Uniform distribution of the additive was ensured by thorough mixing prior to water addition. Casting and curing of the concrete were done in line with established standard. The compressive strength test was carried out using the Instron universal testing machine and the oxides of elemental composition of the cement and the additives were determined using EDXRF Spectrometer (EDX 3600B) while the crystallography studies were carried out using EMMA) X-ray diffractometer . The result obtained indicated that there was a significant difference between the value of density, packing efficiency and compressive strength of each reinforced concrete with that of the reference cement which was attributable to the presence of additives. The cement formulation with silica as admixture was found to have the highest compressive strength of 217.94 MPa, while the reference cement had the lowest compressive strength of 81.45 MPa. This study has established that locally sourced organic additives (emerging additives), influence the mechanical properties of concretes.

关键词： High Strength Concrete (HSC) Organic Waste Compressive Strength Elemental Characterization

Variational Iteration Method Solutions for Certain Thirteenth Order Ordinary Differential Equations

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Applied Mathematics 2013年第10期4卷 1405-1411页

作者： Tunde A. Adeosun olugbenga J. Fenuga Samuel O. Adelana Abosede M. John Ogunjimi olalekan Kazeem B. Alao Department of Mathematics University of Lagos Lagos Nigeria Department of Mathematics Yaba College of Technology Lagos Nigeria Department of Mechanical Engineering Yaba College of Technology Lagos Nigeria

In this paper, we extend variational iteration method (VIM) to find approximate solutions of linear and nonlinear thirteenth order differential equations in boundary value problems. The method is based on boundary valued problems. Two numerical examples are presented for the numerical illustration of the method and their results are compared with those considered by [1,2]. The results reveal that VIM is very effective and highly promising in comparison with other numerical methods.

关键词： Variational Iteration Method Boundary Value Problems Linear and Nonlinear Problems Approximate Solution

Synthesis, characterization and antimicrobial activities of some metal(II) amino acids’ complexes

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Advances in Biological Chemistry 2012年第3期2卷 268-273页

作者： Temitayo Olufunmilayo Aiyelabola Isaac Ayoola ojo Adeleke Clement Adebajo Grace Olufunmilayo Ogunlusi Olayinka Oyetunji Ezekiel olugbenga Akinkunmi Adebowale Olusoji Adeoye Adis Pharma Inc. 5238 Palmetto Place Mississauga ON L5M OC8 Canada Department of Chemistry Faculty of Science Obafemi Awolowo University Ile-Ife Nigeria Department of Chemistry University of Botswana Gaborone Botswana Department of Pharmaceutics Faculty of Pharmacy Obafemi Awolowo University Ile-Ife Nigeria Department of Pharmacognosy Faculty of Pharmacy Obafemi Awolowo University Ile-Ife Nigeria

Metal(II) coordination compounds of glycine and ph-enylalanine were synthesized and characterized using infrared and electronic spectroscopic, and magnetic susceptibility measurements. The complexes were tested for antimicrobial activity against Bacillus subtilis, Staphylococcus aureus, Methicillin Resistant Staphy-lococcus aureus (MRSA), Escherichia coli, Pseudo-monas aeruginosa, Proteus vulgaris and Candida albicans. The stoichiometric reaction between the metal (II) ions and ligands in molar ratio M:L (1:3) [where M = Mn, Co, Ni, Cu and Cd;L= glycine;phenylalanine] resulted in the formation of five-coordinate square pyramidal dinuclear geometry for both copper complexes and six-coordinate octa-hedral geometry for the other complexes. The spectroscopic and magnetic moment data suggested that the ligands coordinated via both their amino and carboxylate ion moieties. The complexes demonstrated better activities against one or more of the tested microbes than acriflavine, the standard drug used.

关键词： Glycine Phenylalanine Coordination Compound Antimicrobial Chelation