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OALib Journal期刊

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Investigation of the Effects of Air-Conditioning System on the Temperature and Speed of Automobile Engine Using Paired T-Test and Regression Analysis  [PDF]
Olufemi Sylvester Bamisaye, Anthony Yinka Oyerinde, Ubong Akpan Essien
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105090
Abstract:
This study investigated the effect of air-conditioning system on the tem-perature and speed of automobile engine before and after the air-conditioning system was put to use, while the vehicle was at static position. A 16-valve Nissan engine was used for this study, the engine was first run for 20 minutes before the data are collected. In the first case, the temperatures (℃) of the engine were taken in the interval of 10 minutes before and after the air-conditioning system is run and in the second case, the speeds of the engine were taken under the same conditions. The research hypothesis was formulated for 20 observations to argue that neither temperature nor speed of the engine changes when the air-conditioning system is put on and Paired t-Test statistics were used. The obtained result of t-statistics analysis for temperature and speed were -4.0329 and -5.51832 respectively. These results when compared to their critical values at 5 percent significant level, t-Statcritical < -1.73 for temperature and speed, were discovered to be at the rejection region which indicates that the null hypothesis (Ht0 and Hs0) in each case is rejected and accept that the air-conditioning system changes the temperature of the engine. Also, changes in speed requirements of the engine are not immediate and it could be as a result of an increase in fuel consump-tion due to more load on the engine. The regression correlation coefficients of 0.999996066 and 0.999653453 were obtained for the temperatures and speeds respectively with their R2 values, 0.999992132 and 0.999307027. The coefficients in the analysis were used to formulate the regression equations; T2 = 135.640 1.025t 0.496T1 and N2 = 634.005 3.824t 0.270N1 which can be used to forecast the temperatures and speeds of the engine during air-conditioning usage giving the initial parameters.
Oral health status and treatment needs of children and young adults attending a day centre for individuals with special health care needs
Folakemi A Oredugba, Yinka Akindayomi
BMC Oral Health , 2008, DOI: 10.1186/1472-6831-8-30
Abstract: This study was carried out as part of an oral health screening program organized by the institution and consent was obtained from parents and guardians before the screening. All information was supplied by the parents during the screening using a questionnaire completed by the dentist. Oral examination was carried out on all consenting subjects in attendance on the days of screening in the school clinic with parents and teachers in attendance, using standard World Health Organisation oral health indices to assess dental caries, oral hygiene status, malocclusion and other oral health parameters.Fifty-four subjects aged 3–26 years (mean 12.28 ± 6.82 years) and comprising 72.2% males and 27.8% females participated in the study. Over 90% were from parents of high and middle level educational background. Thirty-six (66.7%) were caries free, with a mean dmft score of 0.7 ± 1.77 and mean DMFT score of 0.4 ± 1.44 with no significant difference across gender (p = 0.5) and parents' educational status (p = 0.43). The mean OHI-S of the total population in this study was 1.36 ± 0.16. Females had a mean score of 0.88 ± 1.10 while males had a mean score of 1.55 ± 1.24 with no significant difference (p = 0.6). Twenty-five (46.3%) had good oral hygiene, 17 (31.5%) had fair oral hygiene and 12 (22.2%) had poor oral hygiene, with no significant difference across gender (p = 1.11) and age groups (p = 0.07). Fifteen (27.8%) had gingivitis with no significant difference across age groups (p = 0.17). Forty-five (83.3%) had Angle's class I malocclusion, 6(11.1%) class II and 3 (5.6%) class III. Chronologic enamel hypoplasia was found in 9 (16.7%) of the total population. Up to 53.7% of the total population will require oral prophylaxis, 33.3% required restorations on their posterior teeth and 12.9% required veneers for labial facing of hypoplastic enamel.The subjects in this study had a high prevalence of dental caries and need for restorative care. They would benefit from parental educati
Comparative Cost Structure and Yield Performance Anzlysis of Upland and Mangrove Fish Farms in Southwest, Nigeria
Mafimisebi Taiwo Ejiola,Okunmadewa Foluso Yinka
International Journal of Agricultural Management and Development , 2012,
Abstract: The bias against mangrove areas in siting fish farmsprompted a comparison of the cost structure and yieldperformance in upland and mangrove locations. Tools utilizedincluded descriptive statistics, budgetary and cash flow analysesand profitability ratios. Empirical results revealed that substantialrevenue could be realized from both farms. While the uplandfarms yielded average gross revenue per hectare per year of$9,183.53, the mangrove farms made $8,135.93 revealing aslight difference. Results of combined cash flow and sensitivityanalysis buttressed that of budgetary analysis. NPVs were$10,888.11 and $10,375.84, B/Cs were 1.28 and 1.29 and IRRwere 48.55% and 48.51% for the upland and mangrove farms,respectively. Profitability ratios were also comparable butslightly higher in the upland farms. The conclusion is thatthere was little or no difference in yield performance. However,the high risk of investment loss in years of excessive floodshould prompt investors in mangrove farms to compulsorilyinsure their farms.
Application of Bousinesq's and Westergaard's formulae in analysing foundation stress distribution for a failed telecommunication mast
Olalekan Yinka Ojedokun,Festus Adeyemi Olutoge
Physics , 2012,
Abstract: The concurrent foundation failure of telecommunication masts in Nigeria and all over the world which endanger the lives and properties of residents situated within the fall distance of the telecommunication mast are a thing of great concern. In this study, a GSM mast that underwent foundation failure at Ibadan, Oyo State, Nigeria was critically examined with a view to providing engineering solution. The soil investigation at the global system for mobile communications (GSM) telecommunication tower comprised of laboratory tests: sieve analysis, Atterberg limits and moisture content tests were carried out on the soil samples obtained while Dutch cone penetrometer test was performed on the site to a depth of refusal to determine the allowable bearing pressure at various depths of the soil. The application of Boussineq's and Westergard's formulae for point loads using Java programme to simulate and compute the stress distribution at various predetermined depths showed the stress distribution pattern beneath the failed foundation of the structure. The stress distribution pattern revealed that the soil strength was lower than the imposed loadings from the structure thereby resulting in differential settlements and cracks at the foundation. A variety of engineering solutions were recommended to improve the soil strength and thus prevent such occurrences in future.
Tax Burden Implication of Tax Reform  [PDF]
Yinka Mashood Salaudeen, Tayibat A. Atoyebi
Open Journal of Business and Management (OJBM) , 2018, DOI: 10.4236/ojbm.2018.63058
Abstract:
This study examines the effect of the 2007 reform pertaining to the corporate tax system on the tax burden of listed firms in Nigeria using the “t” test and canonical correlation analysis. Data were collected from the financial statements of the 86 sampled firms for the period 2003-2011 subdivided into pre-reform (2003-2006) and post reform (2008-2011) sub-periods for the purpose of comparing periods’ tax burdens. Data were also segregated along the Nigerian Stock Exchange industrial sector classifications. This study finds, on the whole, that the 2007 corporate tax reform has brought no additional tax burden on listed firms, however, sectoral analysis reveals the heterogeneity in the effect of the tax reform as firms within the agricultural and natural resources sectors witnessed increases in tax burden while firms in health and oil and gas sectors were favoured with reduced tax burden. The tax burden of other sectors is unaffected by the reform.
Identification of the forest strain of Onchocerca volvulus using the polymerase chain reaction technique
B Adewale, MA Mafe, JPO Oyerinde
West African Journal of Medicine , 2005,
Abstract: Annual mass treatment with ivermectin for 12 – 15 years in endemic communities is the control strategy adopted by the African Programme for Onchocerciasis Control (APOC) for the control of onchocerciasis in Nigeria. This long-term treatment necessitates the use of Polymerase Chain Reaction (PCR) for the proper identification of the Onchocerca species and strains in endemic areas and also for monitoring recrudescence of infection in areas where infection has been controlled. This study, which forms part of a larger study on transmission of onchocerciasis identifies the Onchocerca volvulus strain in Ondo state using the Polymerase Chain Reaction (PCR) technique. Deoxyribonucleic acid (DNA) was extracted from the adult worm of Onchocerca parasite using the glass bead method of extraction. The repeated sequence family present in the genome of the parasite designated as 0-150bp was amplified by the polymerase chain reaction (PCR). The amplified parasites produced significant products visible as bands in a 2% agarose gel stained with ethidium bromide. Hybridization of the PCR products with specific DNA probe identified the products as forest strain of Onchocerca volvulus. The epidemiological implication of this is that there would be more of the skin lesions and low blindness rate in the area.
Some mineral profiles of fresh and bottled palm wine – a comparative study
M E Ukhun, N P Okolie, A O Oyerinde
African Journal of Biotechnology , 2005,
Abstract: Some mineral profiles of fresh palm wine and those of seven brands of bottled palm wine were analysed using atomic absorption spectroscopy and the values were compared. Three of the bottled samples contained toxic levels of either Pb or Cd or both. Neither metal was detected in fresh palm wine. Zn, Cr and Ni were 2 to 15 times higher while Cu was 2 to 5 times lower in bottled samples than values for fresh sample. The likelihood of water- derived heavy metal contamination during bottling, and its potential health implication for consumers are discussed.
Food Potentials of Some Indigeneous Wild Fruits in Lowland Rainforest Ecosystem of South West Nigeria
V.A.J. Adekunle,O.V. Oyerinde
Journal of Food Technology , 2013,
Abstract: Food potentials of some selected plant species with edible fruits of the lowland rainforest ecosystem of southwest Nigeria were examined in this study. Eight fruits species distributed among seven families were harvested fresh from Ala Forest Reserve located in Ondo State, southwest Nigeria for the analysis. Proximate, mineral and anti-nutritional factors were determined on dry matter basis for the samples. Six of the fruits were analyzed raw while two were roasted and also boiled to bring them to the same level of consumption. It was discovered that the plant species flower and fruit at different period of the year and this made them to be available all year round. The results of the chemical analysis show that all the selected fruits contained adequate level of food nutrients required for normal body functioning and the levels of the anti-nutrients obtained are well below the lethal dose which can make them detrimental for consumption. Their protein values were discovered to be high (above 100 g kg-1 DM) except C. albidum. All the fruits are potentially good as cheap source of protein and other essential nutrients for the rural sector of the economy that are facing food crisis today. Conservation strategies were recommended for the species to avert the extinction threat on them as a result of increased pressure on this lowland rainforest ecosystem. This will also make them sustainable.
Socio-Economic Characteristics of African Locust Bean Producers in South West Nigeria
O.V. Oyerinde,1A. G. Daramola
Pakistan Journal of Social Sciences , 2012,
Abstract: This study assessed the socio-economic characteristics of African locust bean producers in the savannah zone of Oyo State, South West Nigeria. Data for the study were collected from 160 respondents through the use of validated questionnaire. Descriptive statistics and gross margin analysis were used to analyze the data. The findings revealed the three stages of production as collection, semi-processing and processing. It also revealed the tenurial status of collectors of African locust bean, as a factor that impedes its promotion and development in this area of study. It was also discovered that, women mainly do the processing of African locust bean into food condiment, while the collection of the matured fruits is carried out by men.
A Review of the Impact of Requirements on Software Project Development Using a Control Theoretic Model  [PDF]
Anthony White
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.39099
Abstract: Software projects have a low success rate in terms of reliability, meeting due dates and working within assigned budgets with only 16% of projects being considered fully successful while Capers Jones has estimated that such projects only have a success rate of 65%. Many of these failures can be attributed to changes in requirements as the project progresses. This paper reviews several System Dynamics models from the literature and analyses the model of Andersson and Karlsson, showing that this model is uncontrollable and unobservable. This leads to a number of is-sues that need to be addressed in requirements acquisition.
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