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Assessment of the Effects of Temperature, Precipitation and Altitude on Greenhouse Gas Emission from Soils in Lagos Metropolis  [PDF]
Rose Alani, Shakurideen Odunuga, Nkenie Andrew-Essien, Youpele Appia, Kolawole Muyiolu
Journal of Environmental Protection (JEP) , 2017, DOI: 10.4236/jep.2017.81008
Abstract: Significant pool of carbon is present in the biosphere as soil organic carbon (SOC). More carbon is stored in the soils which include peatlands, wetlands and permafrost than is present in the atmosphere. There are still controversies regarding the effects of climate change on global soil carbon stocks. This study seeks to: assess the effect of altitude, temperature and precipitation on the greenhouse gas emission from soil; and to examine the correlation between soil organic carbon and soil texture. With a total of 81 samples collected at 3 different depths (0 - 10 cm, 10 - 20 cm, 20 - 30 cm) from 27 locations in different regions of Lagos, the relation of soil organic carbon concentration to climate was investigated. Samples taken were analyzed for soil organic matter, soil organic carbon (SOC), and percentage of silt/clay/sand. The amount of carbon dioxide released was calculated. Temperature, precipitation and altitude were also taken into consideration. From the 27 locations topsoil had 8 locations of highest SOC contents; middle soil had 2 locations of highest SOC contents while bottom soil had 17 locations of highest SOC contents. SOC contents of top soil were linked with soil texture, vegetation type, temperature, precipitation, and altitude. The study showed that SOC increased with decrease in temperature, decrease in precipitation, and increase in altitude. Forest, shrubs and grassland types of vegetation, as well as soil depths also favour SOC contents. The study also showed that increase in temperature and altitude favours greenhouse gas emission from the soil. From our findings, SOC and climate change are greatly linked.
The State of Reading in Selected Secondary Schools in Oyo State, Nigeria
COO Kolawole
African Research Review , 2009,
Abstract: The paper is a survey of reading in selected secondary schools in Oyo State, Nigeria. It covered schools selected across the three senatorial zones of the State. In undertaking the study, the researcher with the support of research assistants first observed the teachers and students in the schools in their reading activities and later administered a self-designed questionnaire on them. The questionnaire sought information on the reading related activities of teachers and students as well as the availability or otherwise of materials to facilitate reading in the schools concerned. Descriptive statistics of frequency and percentage counts were used to analyse the data generated from the study. The outcome of the study revealed that reading is not given adequate attention in the schools the way it ought to, all the subject teachers do not handle the teaching of reading while the reading activities in the school are left to the discretion of students. Among the teachers who give attention to reading, we found a majority of them who failed to give students the necessary motivation to strengthen their interest in reading. It was also found out that most school heads contributed to the poor reading culture of the students by their attitude to issues that bother on reading and how it can be promoted in their schools. This is because most of the schools have no functional libraries and other facilities that can promote effective reading of reading. Based on the foregoing, adequate recommendations that would promote reading at the secondary school level in the State have been made in the paper.
Determinants of Profit Effciency among Small Scale Rice Farmers in Nigeria: A Profit Function Approach
Ogundari Kolawole
Research Journal of Applied Sciences , 2012,
Abstract: This study employs a stochastic frontier approach to examine profit efficiency of small scale rice farmers in Nigeria using farm-level survey data collected from 200 farmers in the study area. Data were analysed using descriptive statistics and standard profit function. The result shows that about 60% of potential profit is gain due to production efficiency while the remaining can be attributed to both technical and allocative inefficiencies in the study area.Also, the result further revealed that age, educational level, farming experience and household size positively affected profit efficiency .These variables are thus important in policy formulation by government.
Colonial and Military Rules in Nigeria: A Symmetrical Relationship
Dipo Kolawole
Pakistan Journal of Social Sciences , 2012,
Abstract: The Nigerian state has been fundamentally affected by two historical phenomena, colonial rule and military rule. Whereas colonial rule ended about forty-five years ago at the attainment of independence, military rule as a post-colonial instrument of conquest does not seem to have a perceivable abatement. This is in spite of the return to another civil rule since 1999. Indeed, the military conquest has reemerged in the involvement of ex-military rulers in politics. This study presents the dilemma of a post-colonial state coping with contradictory factors of development and democracy.
From Isolation to Globalization: Transformation of Nigeria’s Foreign Policy from the Abacha Regime to the Obasanjo Administration
Dipo Kolawole
Pakistan Journal of Social Sciences , 2012,
Abstract: Nigeria at Independence in 1960 presented an image of an ideal colonial state transiting to independence with the prospects of an admirable model of Westminster democracy. The hope collapsed soon after, due to a barrage of internally contradictory factors of building a nation out of disperse and diverse states. The intervention of military in the post-colonial government retarded and indeed, aborted the process of democracy. Different military leaders emerged projecting different interests not related to the national interest. This study interrogates the descent of Nigeria to a pariah state under Abacha and her resurgence into global politics under Obasanjo.
Effects of Russelia equisetiformis methanol and aqueous extracts on hepatic function indices
OT Kolawole
Biology and Medicine , 2010,
Abstract: Russelia equisetiformis is a medicinal plant used by traditional healers to treat malarial, cancer and inflammatorydiseases. It is also claimed to promote hair growth. Methanol and aqueous extracts of Russelia equisetiformis wereadministered orally to experimental rats at various doses of 100mg/kg, 200mg/kg and 400mg/kg for 28 days. At the endof the 28-day treatment, the animals were sacrificed under light ether anesthesia. The blood samples were collectedseparately by carotid bleeding into sterilized dry centrifuge tubes. The clear serum was separated at 2500 rpm for10min. The effect of the extracts on hepatic function was evaluated by the assay of biochemical parameters (serumprotein, total bilirubin, aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase(ALP). In both aqueous and methanol extract – treated animals, there was significant dose – dependent increase intotal bilirubin, ALT, AST, and alkaline phosphatase levels but a significant reduction in serum protein. However, theseeffects were more pronounced with the methanol extract. The study showed that chronic use of both aqueous andmethanol extracts of Russelia equisetiformis could impair normal liver function.
Interference Mitigation in Satellite Personal Communication Networks Using Adaptive Antenna Arrays and Filtering Technique  [PDF]
Sunday E. Iwasokun, Michael O. Kolawole
Wireless Engineering and Technology (WET) , 2010, DOI: 10.4236/wet.2010.12013
Abstract: We address the problem of interference as related to Satellite Personal Communication Networks (S-PCNs). Basic low Earth orbit (LEO) constellation is considered. The paper uses combined adaptive antenna arrays and adaptive filtering technique. This hybrid linear adaptive technique provides improved performance eliminating interference, particularly uncorrelated signals residing in the antenna sidelobes.
USING Hybrid Adaptive Techniques to Reduce Multipath Effects in S-PCN Mobile Terminals  [PDF]
Sunday E. Iwasokun, Michael O. Kolawole
Communications and Network (CN) , 2010, DOI: 10.4236/cn.2010.24035
Abstract: Multipath signal processing is a promising technique for increasing the capacity of downlink frequency of satellite communication networks (S-PCN). The paper presents an approach to processing and reducing multipath signals received from S-PCN typified of mobile terminal users in clustered or mountainous environment. Use of hybrid linear adaptive antenna array technique and adaptive filtering technique provides improved performance by eliminating uncorrelated signal residing in antenna sidelobes.
Uplink Performance Evaluation of CDMA Communication System with RAKE Receiver and Multiple Access Interference Cancellation  [PDF]
Ayodeji J. Bamisaye, Michael O. Kolawole
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.36072
Abstract: In CDMA communication systems, all the subscribers share the common channel. The limitation factor on the system’s capacity is not the bandwidth, but multiuser interference and the near far problem. This paper models CDMA system from the perspective of mobile radio channels corrupted by additive white noise generated by multipath and multiple access interferences. The system’s receiver is assisted using different combining diversity techniques. Performance analysis of the system with these detection techniques is presented. The paper demonstrates that combining diversity techniques in the system’s receivers markedly improve the performance of CDMA systems.
Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System  [PDF]
Ayodeji J. BAMISAYE, Michael O. KOLAWOLE
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.21001
Abstract: In wireless Code Division Multiple Access (CDMA) system, the use of power control is indispensable to combat near-far and fading problems. Signals transmitted over a multipath propagation channel which exhibits inter-path interference and fading. The receiver has to employ measures to mitigate these effects or it will incur severe performance degradation. A classic approach in CDMA communications is the rake receiver. In this paper, the downlink performance is estimated for a CDMA mobile system at the vertex of multiple adjacent cells. At the base station the received signal is coherently dispread and demodulated using a rake receiver. The effects of power control, error correction and rake receiver were also investigated on the assumption that the received signals undergo Rayleigh fading, lognormal shadowing, and frequency selective fading. The evaluation of performance measures of base to mobile link (downlink) of a multiple-cell CDMA mobile system is presented. This study demonstrates that significant performance improvements are achievable with combined use of power control, rake receiver and error correction scheme.
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