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.

Modelling of the effect of current-carrying jets on the temperature of an astrophysical surrounding

Abstract: Numerical solution of the effect of current-carrying jets on the temperature of an astrophysical surrounding is carried out using classical magnetohydrodynamic equations. Under the assumption of small hydrodynamic and magnetic Reynolds numbers and invoking a jet magnetic field intensityBθ, which confines high pressure jets along thez′-axis, a non-linear equation is generated and solved by asymptotic approximation. It is found that when the field intensity is large, the temperature of the surrounding is small and vice-versa. The problem is of interest in the astrophysical studies of current-carrying jets or magnetised radio jets.

Optimizing Gas Turbine Bearing Vibration Using 2D D’Alembert’s Equation

Abstract: The ability to identify faulty equipment under severe conditions allows the manufacturers and operators to take appropriate proactive measures to rectify the faults and provide an assessment for early detection of the engine defects that could lead to catastrophic failure. This work therefore shows that such counter measures can be carried out by optimization, modeling, simulation or using a reliable analysis of gas turbine engine, rotor shaft and bearing vibration data through 2-Dimensional D’Alembert’s equation. Gas turbine plants on industrial duty for electricity generation were thus used to actualize the research. The data for vibration amplitude of rotor bearings from the reference engine which varied between 0.19 and 3.81 mm/s were compared with those obtained from a failed engine of similar characteristics just before failure and used for the simulation and modeling. The given engine speed and active load were also determined as falling between 7264 rpm to 7436 rpm and 10 MW to 20 MW respectively. A well packaged computer program code-named “MELBF” written in C++ programming language was developed. The results show that the machine should not be run beyond 3.81 mm/s vibration amplitude in order to avoid resonance and downtime of the engine.Copyright © 2012 by ASME

Elimination of tyramine in protein energy-deficient Wistar rats

Abstract: The in vivo biliary elimination of the dietary amine tyramine was studied in protein energy-deficient rats. Tyramine was administered intraperitoneally at single doses of 1200 μg/kg body weight to Kwashiorkor Wistar rats following cannulation of the bile duct. Excretory products in 24-h samples of feces and urine from both Kwashiorkor and normal cannulated rats, who were similarly dosed with tyramine, were also examined. The feces and urine samples were subjected to spectrophotometric and paper chromatographic analyses that showed the presence of tyramine, p-hydroxyphenylethanol, p-hydroxyphenylacetic acid, p-hydroxyphenaceturic acid, and N-acetyltyramine. Thin-layer chromatography of the bile from test rats followed by ultraviolet analysis of the chromatogram confirmed the presence of unchanged tyramine and the metabolite p-hydroxyphenylethanol. The results confirm that the bile is an excretory route for the amines and also that nutrition plays an important role in the pharmacological or toxic action of ...

Comparison of Treatment and Purification of Salt Water Using Moringa Oleifera Leaf: The Concept of Photo-integration

Abstract: The research work was carried out to examine the usefulness of moringa oleifera leaf dried in the presence of sunlight for effective treatment of salt water to achieve a reasonable and acceptable concentration when compared with the existing world standard value. The functional parameters examine in this research work are turbidity, pH, conductivity and temperature and the result obtained result suggested that Moringa Oleifera is effective at the concentration of 80 to 100 mg/L as a coagulant to treat salt water, contaminated water and ground water as well as reduced the functional parameters that value is above the World Health Organization Standard (WHO). The research work demonstrates the usefulness of Moringa Oleifera in treatment and purification of contaminated water to the International Standard. Key words: Comparison, treatment, purification, salt water, moringa oleifera leaf, concept, photo-integration

Probability Approach to Casing Design Using Monte Carlo Simulation

Abstract: Casing design plays an important role in the successful drilling of a well and accounts for a substantial percentage of well costs. The goal of casing design is to get an optimal design that will withstand stress and other factors that affect casing throughout the lifetime of the well. The conventional approach to casing design uses a deterministic working stress design (WSD), where minimum strength requirements of the casing are determined by comparing casing strength to the magnitude of severe accidental loads that may occur during the lifetime of the well. Uncertainties in the load and strength of the casing are accounted for by multipliers called safety factors (SFs) that are mostly based on experience and do not reflect the probability or consequence of the different casing failure modes. This approach may result in overly conservative casing designs, or design requirements for severe conditions that are expensive, leading to higher well costs. In this paper, the Monte Carlo Simulation (MCS) method is applied to casing design, where uncertainties in casing loads are considered explicitly by assigning probability distributions to safety factors that affect design loads. As the MCS method predicts the casing safety factor probability, it gives a better view of the real uncertainties involved in the design. Acceptable probabilities of casing design load can be selected based on the cost and operating conditions the casing will undergo; thus, a probability approach to casing design is more flexible as it allows an explicit uncertainty-consistent designs compared to traditional working stress designs.