E. N. Ikezue, C. J. Obi, T.G. Amie-Ogan .
Page No : 1-7
Gas Transmissibility Forecast and the Sustainable Development of Nigeria’s Dwindling Economy
The United Nations Commission on Environment and Development has defined sustainable development as one which
allows nations to meet their present needs without compromising the ability of future generations of the citizenry to meet
their own needs. This concept of sustainable development is properly illustrated by a system which operates in an
equilibrium state or in a steady state and hence undergoes changes at a monetary inflationary rate which is carefully and
promptly regulated by the governmental agencies i.e. Central Bank of Nigeria (CBN) the financial institutions etc.
Sustainable development of Nigeria’s economy is directly hinged on the prudent and efficient management of its natural
resources the greater percentage (approximately 80%) being natural hydrocarbon reserves. Natural gas as it comes from
the well head is properly processed, liquefied in liquefied Natural gas (LNG) Cascade of Heat Exchangers for in country
domestic application and for export for the boasting of the external monetary reserves. The paper highlights
computational algorithms for the transmissibility forecast of gas delivery from a case study well Excravos field south west
Nigeria. The simulation algorithm is translated into a software (MATLAB) which is implemented on a digital desktop
Nwabueze, C. A..
Page No : 8-17
Time-Frequency Synchronization Effect on 5G Multicarrier Systems
Synchronization in the time-frequency domain for the fifth-generation (5G) new radio (NR) takes the fundamental steps
as in all mobile networks to have user equipment (UE) properly receive and transmit data. The corresponding
synchronization for 5G has various challenges due to the wide range of frequencies. This is more so when it comes to
applications that would need accurate oscillators to reduce the large values of the frequency offset. This paper presents
challenges and issues within the 5G NR synchronization specifically on the pilot-based time and frequency
synchronization for OFDM and UFMC systems. It also compares cyclic prefix (CP) based synchronization as it applies to
OFDM systems with UFMC noting that no CP is inserted in UFMC system. The effect of timing and frequency offset on
OFDM and UFMC systems is then presented with two approaches, CP-based and pilot-based synchronization. Simulation
results of the synchronization performance shows that the UFMC out performs OFDM making it more adaptable to 5G
Mmonwuba, C. N. .
Page No : 18-25
Effect of Soak-Away on Ground Water Qualities in Onitsha North Local Government Area of Anambra State
Soak-away are increasingly in use in the country due to absence of proper waste water sewage system. The effluent fromsoak – away may contribute greatly to ground water pollution. This study was undertaken to test some physical, chemicaland biological characteristics of ground water (borehole) at random selected houses at Onitsha North Local GovernmentArea of Anambra State. To access the quality of ground water, each parameter tested for was compared with the resultobtained from testing for each parameter in the sample. Most of the parameter tested for where within the World HealthOrganization (WHO) standard except for the total viable bacteria of the samples. The conclusion will then show if theground water in Onitsha is fit for domestic and drinking purposes and to know if it still need treatment to minimize theconcentration especially the acidity and total coliform, if the need be. Suitable recommendation will be made at the end toimprove the quality of ground water at Onitsha North Local Government Area of Anambra State mainly for Ozomagala,D.M.G.S, Oboli-lane, Egbuna and Anionwu and if it is suitable for drinking and domestic purposes.
Edward, O. S., Ugenlo, L. O. , Nwabueze, C. A..
Page No : 26-34
Comparative Evaluation of Microwave Thermography and Mammography
Mammography is widely used in early breast cancer detection and prevention although it constitutes ionizing radiation
(X-ray) properties of which continuous exposure could lead to chances of cancer. On the other hand, thermography
operates under infrared and microwave region consisting of non-ionizing radiation properties and is used not just for
breast cancer detection and other special applications in medical services but also for Surface Month Technology (SMT) ,
Printed Circuit Board (PCB) evaluation and troubleshooting, etc. In the bid to design and develop modern technologies
especially for testing and measurement systems in medical and engineering services with less false positive result,
mammography and thermography are generally considered. Their applications, uses and limitations are presented in this
paper with emphasis on design and development of multiple task engineering systems. The study shows that for breast
cancer diagnosis, mammography has 96.1% accuracy while thermography has 97.1% accuracy. Mammography has high
false positive result when compared with thermography leading to dangerous threat on the patients. Although
mammography is very common and cost effective, it is recommended that thermography be further developed to increase
its use and application in health services.
Okoye, F. N. .
Page No : 35-42
Utilization of Geopolymer Concrete for Industrial Development
The aim of this experiment is to utilize locally available industrial waste products to produce binder for concrete
production in order to minimise Portland cement consumption. This is achieved by using alkali- activated binder
known as geopolymer which is an embodiment of mineral polymers obtained from geochemistry. Four geopolymer
concrete mixtures were designed using Fly ash and kaolin as source materials designated as MXX, MX1, MX2 and
MX3 while sodium hydroxide and sodium silicate were used as alkali activators. Portland cement concrete with the
same grade was also prepared to serve as control. Geopolymer concrete specimens were cured in oven at
temperatures of 30
C and 120
C respectively. Compressive strength of geopolymer concrete was
determined and compared with that of OPC concrete. The results show that the compressive strengths of geopolymer
concrete was much higher than that of OPC concrete. It was also discovered that the strength increased with
increasing temperature and curing time.
Odo, K. C, Nwabueze, C. A. , Akaneme, S. A. .
Page No : 43-52
Optimization of Resource Allocation in Cognitive Radio Network Using Artificial Intelligence
Cognitive radio network (CRN), which has been adopted as a promising solution for optimization of the limited available
radio-frequency spectrum, has two major drawbacks: Missed Detection (MD) and False Alarm (FA). This work proposed
fuzzy-based intelligent resource allocation in cognitive radio network (FIRA-CRN) as a solution to the identify
drawbacks. In the methodology, the available channels are classified based on the primary users’ (PUs) utilization, the
number of cognitive radio neighbours using the channels and the capacity of available channels. The Fuzzy Logic
technique is used to determine a channel’s weight value by combining these parameters. The channels with the highest
weight value are selected for transmission. The proposed strategy takes into account false alarm (FA) and miss detection
(MD) metrics to classify the sensed channels into four categories (FA, MD, ON and OFF) based on K-means learner.
This classification helps the strategy to avoid accessing occupied channels. Average interference ratio (AIR), end-to-end
delay (EED) and packet delivery ratio (PDR) were used as key performance indicators to evaluate the proposed scheme
while comparing it with other schemes visa-viz: best-fit channel selection (BFC), GA-based selection (GA), Intelligent
Channel Selection Scheme a Self-Organized Map Followed by Simple Segregation (ICSSSS), and longest idle time
channel selection (LITC). Results showed that FIRA-CRN reduced the AIR by 60%, 40%, 32%, and 7% when compared
with LITC, GA, BFC and ICSSSS respectively. With respect to PDR, it is also observed that FIRA-CRN outperformed
ILTC, BFC, GA, and ICSSSS by 45%, 28.3%, 14.8%, and 7.5% respectively. Besides, FIRA-CRN reduced EED by 88.7%,
84.4%, 77.8%, and 28.3% for LITC, BFC, GA, and ICSSSS respectively. This work can be used to improve the overall
performance of cognitive radio networks.
Anaidhuno, U. P., Owuama C. K., Swift, N. K.
Page No : 53-62
Sustainability of Sisal/Jute Hybrid Polymer Composite for Production of Automobile Body Parts
This research investigated the sustainability of sisal/jute hybrid polymer composite for automobile application. Sisal/Jute
hybrid polymers composite are of low cost, light weight, as well as possess satisfactory mechanical properties, easy
making, availability and user friendly. Sisal/Jute fibres have been proven alternative to synthetic fiber and also
advancing with a substantial potential to displace conventional mild steel in the automobile industry. In this research
work, hybrid composites have been developed using hand layup technique based on percentage combination of Sisal and
Jute fibers in the form of laminates prepared from Unsaturate polyester resin. The prepared laminate samples were
subjected to tensile, flexural, impact and compressive, tests to evaluate their strength which was based on orientations
and fibre percentage combination. Sisal/jute hybrid polymer composite demonstrated fairly good mechanical properties
that could absolutely substitute conventional mild steel used in automobile body.
F. U. IMO, S. A. AKANEME, C. A. NWABUEZE.
Page No : 63-71
Enhancing WCDMA Traffic Capacity Using Adaptive Sectorization
Quality of service (QoS) is a key performance indicator (KPI) that is used in determining the efficiency of
telecommunication services rendered to end users. Accessibility, connection quality and retainability are major factors
used in evaluating quality of service of a network provider. For consumers, it is expected that maximum satisfaction is to
be derived from any services paid for. This maximum satisfaction has now become a difficult task to achieve in the Global
System for Mobile communication (GSM) industry. Congestion in network channels contributes greatly to QoS of any
network which the provider needs good resource management. One of the major problems affecting the capacity of
Wideband Code Division Multiple Access (WCDMA) is interference. WCDMA cellular mobile systems has widespread
acceptance particularly in regional centers where there are large geographical areas to cover. However, temporal
changes of user density due to formation of congregated population centers (called hot spots) can seriously undermine the
system design goals in terms of quality of service and system capacity. This paper presents focuses on reducing cochannel
radiation pattern for the three mobile devices with a measure of the interference between them. Result shows a
desirable reduction in the amplitude of the bars off the diagonal when more antennas are used and how the beams in the
radiation patterns are also narrower. From set value of the experiment cell radius, R = 1km, Reverse Link (SIR
) = 13.6dB,
different orientations Angle, with an increment of energy used as the angle tends to 90
in SIR with angle ? ranging
with a significant reduction of SIR when the number is increased to 25, SIR were -15.19, -13.91and 13.30
respectively. At the expense of the path shadow loss, the difference between the set values
appreciate by 0.02dB at N= 10 instead of the set value N = 12. It is found that in all situations the adaptive sectorization
brings an overall improvement to system capacity and this is particularly significant when the user concentration in hot
spots is substantially larger than that of the rest of the cell.