Nkakini S.O.,Rivers State University of Science And Technology
International Agricultural Engineering Journal | Year: 2015
Sensitivity measured parameters were used to evaluate a better tractive efficiency and tractor forward speeds. The predictive models for tractive force were developed using dimensional analysis. A disc ploughing tillage operations in a loamy sand soil, at tractor forward speeds of 1.94 m/s, 2.22 m/s and 2.5 m/s were conducted, using trace tractor techniques. The dependent and independent variables involved in the models were measured. The wheel tractors tractive force models have sensitivity coefficients ranging from -0.004394 to 2.353,-6.25E.05 to 1.0877 and -1.32E-07 to 1.00 for ploughing, with all the independent variables at 1,94 m/s,2.22 m/s and 2.5 m/s forward speeds respectively. The results obtained in this disc ploughing tillage operation showed that independent variable (U1) caused a negligible change in dependent variables (N). This shows that the sensitivity coefficients obtained in the developed predicted models as variables change are insignificants. Thus, sensitivity coefficients of the tractive force models developed fitted experimental data. Therefore the developed predicted models could be applied.
Olatunji O.M.,Rivers State University of Science And Technology
Research Journal of Applied Sciences, Engineering and Technology | Year: 2011
In this research study, dimensional analysis was used to model the relationship between depth of cut, weight of disc plough and draught on a sandy loam soil. Field experiment was carried out on a site with three different moisture content levels at five different plough speeds (0.83, 1.39, 1.94, 2.4 and 2.78 m/s). It was observed that the depth of penetration of plough disc increased with an increased draught and soil moisture content. The depth of cut was minimum at 4.9% and maximum at 9.4% moisture content. The result obtained from the validation shows that the model can be used effectively to determine the depth of cut in sandy loam soil at different soil moisture levels. Also the draught-speed relationship obtained from this study can be used to predict the power requirement of the disc plough in other soil types. The draught increase linearly with the depth of cut as predicted from the model. The result of the soil properties after tillage operation showed increased shear strength, bulk density and depth of cut. © Maxwell Scientific Organization, 2011.
Nwokoma D.B.,University of Nigeria |
Anene U.,Rivers State University of Science And Technology
Chemical Product and Process Modeling | Year: 2010
There is an increasing awareness of the impact of spilled crude oil and its refined products on human health and environment. The potential of using groundnut husk, agro-based waste, which is not only ubiquitous but indiscriminately littered around Nigerian urban areas, as an adsorbent in removal of oil spilled on water was investigated. Groundnut shell, a waste generated in local vegetable oil processing plants, has been converted into a low cost adsorbent. The groundnut husk was treated and meshed to adsorb crude oil from water at various experimental conditions. Investigations include the effects of sorbent dosage, particle size, contact time and temperature on the adsorption of crude oil. Meshed groundnut shell, especially less than 150 μm, exhibited high affinity for oil adsorption with time. The optimum adsorption temperature range lies between 25 - 45°C. The adsorption data indicates that a pseudo-second-order equation could be used to study the adsorption kinetics and the correlation coefficient of 0.9985 indicates that the sorption process is dominated by adsorption process. The results demonstrate that crude oil removal by adsorption onto this abundantly available low cost and readily biodegradable material is feasible. With high affinity for oil and low water pick up, meshed groundnut shell adsorbent could be said to be oleophilic or hydrophobic. © 2010 The Berkeley Electronic Press. All rights reserved.
Oleforuh-Okoleh V.U.,Rivers State University of Science And Technology
Asian Journal of Animal Sciences | Year: 2016
The aim of this study was to predict hatchability using external egg quality traits. Seven hundred and twenty eggs were collected from inbred populations of three strains of layer-type chickens comprising of two exotic strains: Black Olympia (BO), H and N brown nick (H and N) and the Nigerian Local Chicken (NLC) at 40 weeks of age. The external egg quality traits measured include Egg Weight (EW), Egg Shape Index (ESI), Shell Weight (SW) and Shell Thickness (ST). Highly significant variations existed between the two exotic strains (BO and H and N) and the NLC in all traits expect actual hatchability. Eggs from BO and H and N were 27.76 and 28.34% heavier than those from the NLC (p<0.01). Actual hatchability percentage ranged between 87.73-88.24%. All egg quality traits studied were negatively correlated with hatchability (EW-0.27, ESI-0.38, SW-0.24 and ST-0.68). The correlation between ESI, ST and hatchability were significant (p<0.01). The multiple linear regression analysis revealed that all the traits except EW had significant (p<0.01) linear effect on hatchability with a coefficient of determination (R2) of 0.698. The estimated hatchability prediction model was y = 124.169-0.007EW-0.358ESI+0.639SW- 37.283ST. The high R2 obtained in this study indicates that the variables employed in predicting the model were adequate and therefore suggests the likelihood that the various external egg quality traits influenced hatchability and could be interpreted in an integrated manner, rather than from a mutually exclusive individual basis. © 2016 V.U. Oleforuh-Okoleh et al.
Aniebo A.O.,Anambra State University |
Owen O.J.,Rivers State University of Science And Technology
Pakistan Journal of Nutrition | Year: 2010
The effects of age at which House Fly Larvae (HFL) is harvested and method of drying the larvae, on its proximate values were studied. Larvae were harvested on three different days representing three different ages and the harvested larvae were dried using both oven and sun light. Results revealed that protein content of HFL processed into meal after drying significantly (p<0.05) reduced as the age of larvae increased from 55.4% on 2 day old, through 50.2% on three-day old, to 47.1% on four day old. On the other hand, fat content increased with increase in age of HFL, from 20.8% at age of 2 days, through 22.2% at age of 3 days to 25.3% at the age of 4 days. Fibre content minimally increased with age. Oven-dried maggots had mean higher protein content (50.9%) and less fat (22.8%) than sun dried maggots (47 and 26.4% respectively). Therefore, for maximum protein yield, HFL should be harvested at 2 days old. However, where maggot fat is needed in a diet, increased biomass and or ease of harvesting, processing at later age (4 days old) became desirable. Oven-drying is recommended for superior protein and in rainy season, while sun drying produced higher fat and was cheaper. © Asian Network for Scientific Information, 2010.