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Econometric modeling of the impacts of shipping on Nigeria economy
Get PDFThe article has tablesThe study is conducted to establish a quantitative relationship (model) between the impacts shipping on the economy of Nigeria and the Gross Domestic Product (GDP) using an econometric method and to test the significance of the impact. The econometric/analytical method of regression analysis was adopted to achieve the objective. Time series data of 10 years were collected on the past contributions of maritime transport to the national output (GDP) from the Central Bank of Nigeria annual statistical bulletin. Hypotheses were tested using t-test. The test showed the rejection of null hypothesis HA and the acceptance of null hypothesis HB to conclude that maritime transport has made significant impact on the Nigerian economy over the period covered by the study
Biosorption of Cd and Pb in textile effluent using musasapientum (Banana) peels
No full textThe article contains tables and figuresAbstract:
The efficacy of using Musasapientum (banana) peels was tested for the removal of Cd and Pbusing batch experiments from textile industrial effluent. Standard spectophotometric techniques using AAS were adopted to assess the concentrations of the heavy metals before and after treatment of effluent with the biosorbent (banana peels). Metal sorption increased proportionally with the equilibrium metal concentration. The adsorption capacity of banana peels on the metal ions was of the order: Cd >Pb, with percentage removal of metal ions as 99.93% for Cd and 99.64% for Pb. Biosorption equilibrium isotherms were plotted for metal uptake capacity (q) against residual metal concentration (Cf) in the sample and
mathematically expressed by Langmuir and Freundlich models. The values of separation factor were between zero and one, indicating favorable sorption for the two metals (Cd and Pb) on the biosorbent. Peels of M. sapientum showed comparable biosorption capacity for Cadmium and Lead with other types of biosorbent materials found in literature and are cost effective, economical and eco-friendly in removal of these heavy metals from textile effluent sample
Dynamics of Agribusiness, Finance and Farm Assets Planning
No full textA book written by Eze, Chiedozie on Dynamics of Agribusiness, Finance and Farm Assets Plannin
Reduction in annualar pressure loss by mud rheology control -a means of mud pump pressure control optimization: A case study of Niger Delta well
Get PDFThis is an original research article with tables and figuresThis paper proposes two linear mathematical models for the reduction of annular pressure loss in a Niger Delta well- X, so that mud pump pressure is optimized. Data related to mud rheology, mud pump pressure, drill cuttings and the well geometry is available for well X which has already been drilled. The first linear model involves the reduction in pressure drop in the drill collar-casing annulus and the second linear model involves the reduction in pressure drop in the drill pipe-casing annulus. These models express reduced or critical annular pressure drops in terms of two mud rheological parameters- the yield point and plastic viscosity. For combined annular drill collar and drill pipe pressure loss, this paper proposes that the two linear mathematical models can be solved simultaneously to obtain optimum yield point and plastic viscosity of the drilling mud system to be employed for hole cleaning in the combined drill collar-casing and drill pipe-casing annulus. The Herschel Bulkley model is employed as the rheological model that represents the properties of the drilling mud system
analyzed and is generated for eight rheological cases each of the drill collar and drill pipe annular hole cleaning as well as two cases of the combined drill collar and drill pipe annular hole cleaning