Engineering

Research Papers/Topics in Engineering

Design and Optimization of W-Tailored Optical Fiber

ABSTRACT  This research work studies the temperature effects in W-shaped core refractive index optical fiber. The work designs an optimized W-tailored optical fiber (OWTOF) that checks the effect of rising temperatures in W-tailored optical fiber (WTOF) for better communication. Initially, an introduction to the general concept of optical fibers including tailored optical fibers (TOF), temperature effects and models is presented as a background. This is followed by studies on existing litera...

Integrated Solar and Hydraulic Jump Enhanced Waste Stabilization Pond

ABSTRACT  This study on the integrated solar and hydraulic jump enhanced waste stabilization pond (ISHJEWSP) is aimed at determining the effect of variations in solar radiation, hydraulic jump, hydro-kinematic factors and pond geometry, on the treatment efficiency of wastewater in the ISHJEWSP. An equation to account for these effects was derived, calibrated and verified. An empirical regression model for the prediction of the Biochemical Oxygen Demand (BOD5) in the ISHJEWSP for sewage treat...

Design of Digital Image Enhancement System Using Noise Filtering Techniques

ABSTRACT  Noise Reduction in digital image is one of the most important and difficult techniques in image research. The aim of Noise Reduction in digital image is to improve the visual appearance of an image, or to provide a better transform representation for another automated image processing. Many images like medical images, satellite images, aerial images and even real-life photographs suffer from viewing, removing blurring and noise, increasing contrast, etc. Reducing noise from the dig...

Modeling and Simulation of a Standalone Photovoltaic System

ABSTRACT  The increase in hazardous gaseous emission from the conventional source of energy has motivated many scientists to research on the alternate sources of energy which is cleaner. The chief source of renewable energy is the solar energy. The cleanness of this form of energy source motivated this research work. In this work, Modeling and Simulation of a Standalone Photovoltaic System aimed at increasing the efficiency of solar array system was developed. This work was undertaken to dev...

Analysis of Sandcrete Blocks Production by using different Sources of Sharp Sands in some Parts of South-East Geo-Political Zones. A Case Study Enugu and Ebonyi State

ABSTRACT  This study examined the experimental analysis of sandcrete block production by using different sources of sharp sands in Enugu and Ebonyi State of South East Geo-Political Zone. As a result of the increasing cost of block production, many manufacturers and builders have resorted to using samples of sharp sand from different locations without appropriate consideration of the material constituents of the samples thereby, resulting in poor and undurable sandcrete blocks production. In...

An Improved Model for Key Performance Indicators Analysis for Mobile Number Portability Scheme for GSM Subscribers in Nigeria

ABSTRACT  In Nigeria today it been observed that when changing from one GSM network operators to the other, customers has to give up their old numbers and adopt a new one. As a result, they face switching costs associated with informing people about changing their number, printing new business cards, missing valuable calls from people that do not have the new number, etc. In this research the Key Performance Indicatiors (KPI) of network providers and the causes of poor quality service qualit...

Spatial Variation of the Concentration of Heavy Metals in the Vicinity of a Dumpsite by Finite Volume Analysis

ABSTRACT The study aimed at investigating groundwater pollution in the vicinity of a municipal solid waste (MSW) dumpsite in order to reduce the risks of groundwater contamination and spread of water-borne diseases. To achieve this, the research tools used include model formulation, finite volume analysis, field collection of soil samples at Enugu Waste Management Authority (ESWAMA) dumpsite at various depths along radial sampling lines during wet and dry season periods. Heavy metals (Cu, Fe...

Application of Modified Fmtlxlylz Dimensional Equation to Sludge Filtration using Sludge Drying Bed

ABSTRACT A natural filtration on sludge drying bed has resulted to a modified equation incorporating the compressibility coefficient. The equation was derived using the application of a modified FMTLXLYLZ dimensional analysis technique. The equation was validated using experimental data from a pilot scale sand drying bed and there was a close agreement between theory and experiment with a correlation coefficient ranging from 0.94 to 0.98. The experimental slope and intercept was found to be ...

Comparison between Proportional Integral Derivative Controller and Fuzzy Logic Controller for DC Servomotor

ABSTRACT This study presents a comparative study of two controllers for position and speed control of DC servomotor. PID controller is the most usually used for the position control in DC servomotor. However, the PID controller has some disadvantages such as: the high starting overshoot, slow response for unexpected disturbance and high sensitivity to the controller gain. So, the reasonably design PID controller with computational optimization approach method is proposed to overcome the disad...

The Effect of Silica Fume (S.F) on the Properties of Fresh and Hardened Concrete

General Introduction Concrete is a composite material consisting of aggregates enclosed in a matrix of cement paste including possible pozzolans, has two major components, cement paste and aggregates. The strength of concrete depends upon the strength of these components, their deformation properties, and the adhesion between the paste and aggregate surface [ 1 ]. In recent years, the construction industry has shown significant interest in the use of high strength concrete (HSC), in applica...

Use of Finite Time Thermodynamic Simulation of Performance of an Otto Cycle with Variable Specific Heats of Working Fluid

Abstract  A finite time thermodynamic modelling and simulation of irreversible Otto cycle engines has been developed taking into account the variability of specific heats for working fluid due to temperature variation. The effect of three different parameters on the engine was discussed, which are: the internal irreversibility, the heat losses and the friction losses. A program was developed by using MATLAB software to perform the necessary calculations of thermodynamic model. According to t...

Thermal Modelling of Induction Machine Using the Lumped Parameter Model

Abstract Temperature rise is of much concern in the short and long term operations of induction machine, the most useful industrial work icon. This work examines induction machines mean temperatures at the different core parts of the machine. The system’s thermal network is developed, the algebraic and differential equations for the proposed models are solved so as to ascertain the thermal performances of the machine under steady and transient conditions. The lumped parameter thermal method...

Development of Layered Elastic Analysis Procedure for Prediction of Fatigue and Rutting Strains in Cement - Stabilized Lateritic Base of Low Volume Roads

ABSTRACT It is generally known that the major causes of failure in asphalt pavement is fatigue cracking and rutting deformation, caused by excessive horizontal tensile strain at the bottom of the asphalt layer and vertical compressive strain on top of the subgrade due to repeated traffic loading. In the design of asphalt pavement, it is necessary to investigate these critical strains and design against them. This study was conducted to develop a simplified layered elastic analysis and design ...

Policy and Regulatory Framework for Fiber Optic Backbone in Abuja

ABSTRACT The purpose of this work is to make a contribution to the “Abuja grand design” by proposing a strategy that would facilitate making Abuja feature as a “modern city”. This proposal is entitled “Policy and Regulatory Framework for Fiber Optic Backbone in Abuja”. The main import of the strategy is to network every home and business in Abuja with fiber optics. The city fiber network would serve as a broadband communication medium to provide essentially unlimited and open comm...

Development of a Model of Intelligent Mobile Learning System (Imls) Using Multiagents

ABSTRACT A model of Intelligent Mobile Learning System (IMLS) Using Multi-Agents has been developed and tested in the course of the project reported in this thesis. The IMLS was tailored to match the peculiarities of developing countries especially in terms of limited communications infrastructure and unsteady power supply. Mobile devices communicating over wireless networks are used to provide interaction between learners and teachers anywhere, anytime. In addition to the MultiAgent based IM...


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