Allison, F. N. , Nwanekezie, M. N, Osoka, E. C .
Page No : 1-9
Rheological Study of Performance Enhancement of Ubakala Clay for Use as Drilling Mud
This work studied the performance enhancement of Ubakala clay for use as drilling mud. A sample of Ubakala
clay was used for this research. The clay sample was collected, processed and beneficiated with varying
concentrations of soda ash (0-6wt %). Experiments were conducted to determine the viscosities of the control
and clay-soda ash mixture at different curing time intervals (0-8hours), temperatures (30
Website: www.ijiets.coou.edu.ng Email: email@example.com Page 1
C) and speed of
agitation (200rpm-600rpm). Response surface methodology, with the aid of MATLAB statistical toolbox was
used to perform a statistical study and optimization of the data obtained from the study. The MATLAB curvefitting
toolbox was also used to determine the rheological model that best fit the beneficiated clay and its
control. The result revealed that soda ash concentrations, temperature, curing time and their interactions terms
are significant variables in the statistical model with temperature being the most significant term, while time is
the least significant term. The rheological study of the process showed that the Bingham plastic model
appropriately described the performance of the clay samples as it gave the best fit for most of the samples
(71.67%) studied, based on the value of the adjusted R
. The graphical representation of the control showed a
decreasing rate in viscosity within the required range of speed of agitation unlike those of the clay soda ash
mixture. Further work on Bingham model shows that an optimum predictive value of yield stress occurs for a
curing time of 8hours, temperature of 90
C and soda ash concentration of 5.183wt% are the operating
parameters for enhancing the performance of Ubakala clay sample for use as a drilling mud.
Nwabueze, C. A., Akaneme, S. A, Eleonu, U.
Page No : 10-16
Optimizing the Performance of IEEE 802.11b Wireless Local Area Network (WLAN) Using Discrete Event Simulation (DES) Model
Communication always attracts extensive research interest as it is a core part of modern communication
technology. IEEE 802.11b has become common in recent years largely due to the advantage of user mobility,
relatively low acquisition cost and ease of implementation making it common for both residential and business
Internet access. However, the end user experience has often been less satisfactory than what the technology can
offer. IEEE 802.11b wireless local area network (WLAN) is known to achieve relatively small throughput
compared to other WLAN standards. The focus of this work is on improving IEEE 802.11b network
performance. Quaternary key shifting modulation technique was used with discrete event simulation technique
in Riverbed Modeller software to analyse the IEEE 802.11b network model and parameters. Results showed
that when data rate was increased from 1Mbps to 11 Mbps which is the optimum value, throughput increased
and there was 80% reduction in delay, retransmission attempts also decreased to approximately zero. Results
also showed that when buffer size was increased from 1000bits to 12800bits which is also at optimum value,
throughput increased by approximately 90% with no data dropped since it will take longer time for the buffer to
be filled up and almost zero retransmission attempt was achieved. This work will go a long way in improving
the Quality of Service of the IEEE 802.11b network leading to reduced cost of procurement and overhauling of
devices in the network.
Sijuade, T. Christiana, Esther I. Joseph-Akwara.
Page No : 17-28
Reliability Studies on the Hysteresis Behaviour of Mass Concrete Mixed with Plastic Fibre Under Compression
The research work entails studying the reliability state of mass concrete mixed with plastic fibre under compression.
Concrete is known to be a comparative brittle material when unreinforced, thus when concrete is reinforced with fibre,
the compressive strength of the composite system increases. However, with additional loading, the fibre reinforcing
will be activated, to hold the concrete mix together. This study investigated the effect of plastic fibre on compressive
strength of Plastic Fibre Reinforced Concrete (PFRC) at 1:2:4 nominal mixes at different percentages of plastic fibre.
The mix proportion was 1: 2: 4 with water cement ratio of 0.7. The slump was found to be 162 mm. PFRC cubes used
were cast in 100 x 100 x 100 moulds. All samples were cured in water and tested for 7, 14, and 28 curing age. The
density of PFRC increased with curing age which implies that during curing concrete absorbs water which aid its
hydration The samples were crushed to determine the compressive strengths. The results of the study show that PFRC
has an average compressive strength ranging from 25.6N/mm
. The reliability index at 100years for the
compressive strength of 0%, 0.1%, 0.2%, and 0.3% of PFRC is 0.6889, 0.7124, 0.6922 and 0.693 respectively. This
indicates that PFRC has high reliability index
Iloh, P. I, Nwabueze, C. A, Ohanaja, P.
Page No : 29-38
Three-Term Fault Diagnostic Algorithm for Optimized Incubator Control System
Given the increasing need to optimize production time of incubators, a number of approaches have been used to
develop incubator control system but none of these methods used fault diagnostic and tolerant algorithms integrated
within Proportional-Integral-Derivative (PID) control algorithm. Besides, most of the existing fault diagnostic and
tolerant algorithms were not developed with remote based applications in mind. This work developed and integrated a
fault diagnostic and tolerant algorithm with remote reporting capability into the Existing PID Algorithm (EPIDA).
Behavioral models of the priority components were used to develop an Intelligent Algorithm (IA) on embedded c
language, a hybrid of c and c++ languages while arduino uno was used as a target controller for the developed IA.
Validation of the IA for Fault Diagnosis and Tolerant Control (IAFDTC) was done using the EPIDA and the IAFDTC
to control the process plant under the absence and presence of simulated fault. With 99.05% accuracy as the minimum
benchmark, EPIDA had accuracy of 99.78% under normal conditions and dropped to 96.95% in the presence of
simulated fault confirming that the EPIDA was not originally designed to diagnose and tolerate faults. However, the
IAFDTC had accuracy of 99.96% under normal operation and 99.62% accuracy under the influence of fault. In
addition, it sends remote reports via wireless network to control system custodians. This shows that IAFDTC achieved
an improvement of 2.67% in the accuracy of the existing algorithm while maintaining the system’s availability and
integrity under the influence of fault condition.
Nwokeji, C. E. .
Page No : 39-46
An Overview of Buffer Overflow and Network Intrusion Detection and Prevention Systems
Cyber-crime is becoming a big business run by organised and sophisticated syndicate with varying degree of
Information Technology skills targeting computer applications and programs by running arbitrary code execution
into the memory of a program to take over the program. The aim of this work is to review how traditional host based
protection mechanism like Data Execution Prevention (DEP), Address Space Layout Randomization (ASLR) and
Canaries help to detect and prevent these buffer overflow attacks and how their shortcoming led to the development of
Network Intrusion Detection and Prevention Systems (NIDPS). Secondary data was used to reviewed relevant
available materials in their effort to examine in-depth performance these technologies. It is recommended that
combining anomaly-based with fuzzy logic will be a good technology for intrusion detection and efficient performance
that can reduced false positive alerts.
Agu, B. C, Nwabueze, C. A, Iloh, J. P, Nosike, C. M.
Page No : 47-56
Development of Application Software for Management of Industrial Organization: A Study of Millennium Industries Ltd.
Millennium Industries Limited and many other companies have the problem of streamlining their business processes,
integrating their business units, and providing organizational members with greater access to real-time information. Most
organizations make use of standalone software applications to run their various departmental functions, such as Human
Resources, Finance, Manufacturing, Warehouse Management, Logistics etc. These various standalone software
applications cannot communicate with each other. All these problems and more can be resolved with an application
software called business solution software (BSS) system. This dissertation presents a solution for standardizing an
organization’s operation, leveraging all processes across the organization at an optimized cost by using BSS system
framework. BSS is an integrated set of programs that provide support for core organizational activities such as
manufacturing and logistics, finance and accounting, sales and marketing, and human resources. It is expected to be a
commercial-off the-shelf type of software developed using an incremental process model by carrying out the basic
software development practices. It is also documented. It is coded using Personal Homepage Hypertext Preprocessor
(PHP) programming language. The result of this research is a software that can be used by Millennium Industries limited
to increase speed and performance of business processes and lower cost by about 50% as they run their business. It can
also be used by other small and medium scale enterprises, and even bigger organizations, such as manufacturing
companies, etc, rather than using numerous standalone applications. The BSS system developed in this research can be a
vital strategic tool in today’s competitive business environment.
Ugwuanyi, S. E, Mmonwuba, N. C.
Page No : 57-63
Project Failures in Enugu State: Problems, Prospect and Perceived Solutions
Project failure in Enugu State has been on the increase in recent times. A project is considered a failure when it
has not delivered what was required in line with client need and initial design expectations. To avoid project
failure there must be a good relationship between the client and the project manager so as to have a clear
objective, scope and what is required for successful completion of the project. The problems range from faulty
design, negligence, incompetence, faulty construction, foundation failures, extraordinary loads, engagement of
nonprofessionals and corruption. Forces of nature were also identified as part of causes of project failure. This
study was able to highlight some key challenges contributing to project failures, proposed preferred solutions
and perceived recommendations.
Okoli, C. N. , Onyeso, K. C. .
Page No : 64-74
SIGNIFICANT IMPACT OF INTERNATIONAL TRADE ON NIGERIA’S ECONOMIC GROWTH
The Study centered on Impact of international trade on economic growth in Nigeria with three objectives in which its sole aim it to ascertain if international trade has any significant impact on the growth of the Nigeria Economy within the period of study. Tests were carried out to ascertain the validity of these objectives using time series variables covering 36 years on Gross Domestics Product (GDP), imported goods, exportation of goods and trade openness which were sourced from the National Bureau of Statistics (NBS) Annual Abstract of Statistics and Central Bank of Nigeria statistical bulletin and analyzed using the appropriate statistical tests. The result of the analysis indicated that import and export are positively related to the economic growth in Nigeria while trade openness has a negative relationship with the growth of the economy. Also, the findings of the study further showed that import and trade openness has significant impact on the economic growth of the country within the period of study with 5%level of significance and 35degrees of freedom which falls on rejection region of the null hypothesis. Export is positively related to the GDP but has no significant impact on the growth of the economy. Therefore, import and trade openness are the deterministic variable for the growth of the Nigeria Economy. The Granger Causality Result (GCR) showed that Import and GDP influences each other
(Bi- directional causality) with p-values of 0.0002 and 0.005< =0.05 while export and trade openness has unidirectional influence on the GDP within the period of study. From the results of the study, recommendations were made to advise the government on ways to handle international trade issues towards impacting significantly on growth of the Nigeria economy.
Ikezue, E. N., Umeuzuegbu, J. C. , Egbosiuba, T. C..
Page No : 75-80
NON-LINEAR VISCOELASTIC BEHAVIOR OF HIBISCUS ESCULENTUS FIBER REINFORCED POLYMER COMPOSITES
The paper highlights the sources of linear/nonlinear viscoelastic and visco plastic behavior in hibiscus Esculentus fiber reinforced polymer composites materials. The significance of the study is directly related to the very nature of this material composite which tends to indicate a time dependent behavior. The behavior could either be a linear or nonlinear one and this is normally considered in the study of fiber reinforced composites since it is directly related to strain rate effects, micro damage induced to the structure of the composite and or irreversible plastic strain. The micro damage is due to the application of high stresses or strain and such high stress levels result in an irreversible phenomenon such as viscoelasticity and viscoplasticity and viscoplastic
responses and the process parameters involved were identified. The results show that the viscoplastic strain increases exponentially fig 1 and 2 and attains asymptotic limit of 0.18% for 65MPa (fig 1a) and 0.26% for 70 MPa (fig 1b)
Nzeife, I. D, Mbachu, B. C., Ohia, C. C. .
Page No : 81-88
INHERENT PROBLEMS OF LINEAR INDUCTION MOTORS AND OPTIMIZATION: AN OVERVIEW
Linear Induction Motor (LIM) instead of producing rotary torque from a rotary machine produces linear force from flat one. To optimize the LIM, this paper looks at the construction features and fundamental equations of the LIM. Also presented are the inherent problems associated with LIMs, such as the Longitudinal End Effect (LEE), Edge Effects (EE) and other associated setbacks and then proposes how they could be minimized at the design stage through proper planning or optimizing the existing model using adequate interactive and iterative
software programmes. Other LIM parameters presented and discussed are the objective functions for such designs and optimization form various works
Ikezue, E. N. , Okafor, B. O. , Onukwuli, O. D..
Page No : 89-95
MODELING OF THE THERMOPHYSICAL AND THERMOMECHANICAL PROPERTIES OF FIBRE REINFORCED POLYMER (FRP) COMPOSITES UNDER ELEVATED TEMPERATURES
As the range of applications for fibre-reinforced polymer (FRP) composite materials in material engineering constantly increases, there is more and more concern with regard to their performance in critical environments. The behavior of composite materials in high temperature environments is especially important since complex physical and chemical processes such as the glass transition and decomposition occur when these materials are subjected to elevated and high temperatures possibly leading to considerable loss of stiffness and strength. The stiffness and strength degradation in composite materials under elevated temperatures is the result of changes in polymer molecular structures. When polyester thermosets are subjected to elevated and high temperatures they undergo three transitions (glass transition, leather to rubbery transition and rubbery-to-decomposed transition) corresponding to four different states (glass, rubbery, leathery and decomposed). At elevated temperatures a composite material can therefore be considered a mixture of materials that are in different states. As the content of each state varies with temperature the polymer composite exhibit temperature dependent properties and this
forms the basis for the development of property sub-models for composites at elevated temperatures. The result show that the elastic modulus, E reduces with increase in temperature fig 1: the thermal conductivity, K also decreases with increase in reciprocal temperature fig 2.