Rivers State University of Science and Technology

About: Rivers State University of Science and Technology is a education organization based out in Port Harcourt, Rivers, Nigeria. It is known for research contribution in the topics: Population & Threatened species. The organization has 1826 authors who have published 1833 publications receiving 15183 citations.

Impact of Settlement Growth on Yenagoa’s Urban Environment

Abstract: This research is a study on the assessment of settlement growth and its impact on the urban environment in Yenagoa Metropolis Landsat imageries of 1988, 1996, 2004, 2012 and 2020 were acquired from the United Sates Geographical Survey Supervised image classifications using level 1 classification scheme was adopted to extract LandUse/LandCover The five Epochs of images were used to extract the built-up areas, water bodies and vegetation areas The area (ha) of land use for each epoch was determined using clipping images The spatio-temporal changes were determined as a percentage of LULC per epoch and which was done following standard methods Mapping technique was used to compare satellite imageries Findings showed that built up areas was 1,27981 in 1988, 2,49787 in 1996, 4,55473 in 2009, 7,80430 in 2012 and 10,44750 in 2020 While the percentage change of built-up are in 1988 was 612%, 1996 was 1194%, 2004 was 2178%, 2012 was 3431% and 2020 was 3009%, respectively It is therefore recommended here that government should empower urban planning and development agencies, legally and financially to carry out their responsibility to implement existing master plan of the city Engage in citizen education on how to contribute in managing the environment and sustainable land use management framework in the study area for proper management of the urban environment to enhance sustained settlement growth in the city

Effect of Bioremediation Using Livestock Waste on Physiochemical Properties of Crude Oil Polluted Soil in Ogoni Land, Nigeria

Abstract: An examination of biodegradation of crude oil contaminated soils with poultry droppings, cow dung and combination of both livestock wastes was carried out in the laboratory for physiochemical analysis. The pH was slightly acidic in contaminated loamy –sand and alkaline in contaminated clay soil and stabilized to neutrality later. Carbon dioxide clay soils ranged between 223 – 107mg and 107 – 62mg, mineral hydrocarbon in contaminated loamy sand and clay soils reduced to 8.2 – 6.6% and 11.1 – 8%. The experiment showed that bioremediation of crude oil is enhanced more in loamy sand than in clay soil by biostimulation using environmentally sustainable organic fertilizers.

Implications of Petroleum Industry Fiscal Bill 2018 on Heavy Oil Field Economics

Abstract: Recent increase in energy demand has made necessary the exploitation of Nigerian heavy oil fields neglected in the 1990s. These heavy oil fields were neglected due to low oil price and lack of technology to aid their recovery. Stakeholders in the heavy oil sector have been divided over what fiscal framework applies for the exploitation of Nigerian's heavy oil. The Nigerian Oil Industry has a well-developed fiscal framework for light and medium oil exploitation and the Proposed Petroleum Industry Fiscal Bill (PIFB) 2018. This work studies the economics of an onshore heavy oilfield under the PIFB 2018, to examine the implications of heavy oil exploitation using the PIFB 2018 as a fiscal policy. Field production profiles showing exponential, harmonic and hyperbolic field decline patterns were developed to represent 25.38% recovery factor for a heavy oil field of 196MMSTB OIIP. Deterministic models were built featuring the fiscal instruments of the PIFB 2018, heavy oil price, capital expenditure, operating expenditure and economic metrics. The stochastic model featured the impact of heavy oil price, capital expenditure, price escalation rate, discount rate, and peak production on the contractor's and host government takes for the PIFB 2018. Our stochastic results show that the output variables are most sensitive to heavy oil price, discount rate and capital expenditure. The petroleum industry fiscal bill 2018 is found to be an efficient fiscal policy for the host government and contractor, giving take statistics of 49% and 51% respectively. Varying oil price and discount rate did not make the investment unprofitable but reduced the investment ranking. Exponential decline behavior proved most profitable, while hyperbolic decline proves least profitable. Adjustments of two fiscal instruments of the PIFB was made to enable contractors produce heavy oil using unconventional recovery method and remain in business during periods of low heavy oil price.

Fault Assessment and Mitigation of the 132kV Transmission Line in Nigeria using Improved Resonant Fault Current Limiting (RFCL) Protection Scheme

Abstract: This research work proposed an improved Resonant Fault Current Limiting (RFCL) protection scheme to reduce the impact of three-phase short-circuit faults in a power system sub-transmission network. The model used an interpolator-extrapolator technique based on a Resonant Fault Current Limiter (RFCL) for automating the procedure of predicting the required reactor value that must be in resonant circuit to limit the short-circuit current values to permissible values. Using the developed model, short-circuit fault simulations on the three phases of the transmission line (Phase A-C) were performed in the MATLAB-SIMULINK environment. Simulation results were obtained by varying the resonant inductance (reactor) parameter of the RFCL circuit for each of the phases to obtain permissible short-circuit current levels and the values used to program a functional interpolator-extrapolator in MATLAB; the resonant values were typically set to values of inductance equal to 0.001H, 0.01H and from 0.1H to 0.5H in steps of 0.1H. Simulation results revealed the presence of very high short-circuit current levels at low values of the resonant inductor. From the results of simulations, there are indications that the RFCL approach is indeed very vital in the reduction of the short circuit current values during the fault and can safeguard the circuit breaker mechanism in the examined power system sub-transmission system. In addition, lower fault clearing times can be obtained at higher values of inductances; however, the clearance times start to converge at inductance values of 0.1H and above.