ABSTRACT This thesis highlights the role that transionospheric radio propagation (with particular interest on global positioning system (GPS)) plays in enhancing aviation safety. The ionosphere over equatorial latitudes is characterized with high dynamics (irregularities) that may challenge the performance of transionospheric radio system, especially on phenomenal days. The objectives of this work are to: investigate how ionospheric irregularities grow and evolve, and thereafter assess their ...
ABSTRACT The purpose of this research is to determine the main factors affecting Quality of Service based on mobile Third Generation (3G) and Fourth Generation (4G) service in Angola. The main reason to stimulate the present study was the significantly low rate speed on 3G and 4G service among mobile users in Angola where unlike many other countries the rate of this usage runs in opposite way. Thanks to increasing advances in wireless communications devices, the number of mobile users has g...
Abstract DStv is the only provider of pay television in Zimbabwe at present with over 70 000 subscribers registered country wide. DStv is the flagship product of Multichoice providing various bouquets offering General Entertainment, Movies, Lifestyle & Culture, Sport, Documentaries, News and Commerce, Children, Music Religion and Consumer channels Multichoice subscribers throughout Africa.[3]. In order to receive the transmitted signal at the recommended level, Multichoice insists subscriber...
Abstract Mobile telecoms industry has become a key element of productivity across economies and societies worldwide. The rigorous demand for delivery of services of uncompromising quality in the highly competitive cellular industry has challenged the operators to constantly upgrade their networks. In Zimbabwe we have witnessed a significant transformation within this sector because of the impact it has on the economy with LTE being the latest technology to be considered by most mobile operato...
ABSTRACT The main objective of mobile operators is to enable mobile users to stay connected while roaming across heterogeneous networks. As cellular networks evolve from the third generation Universal Mobile Telecommunication System (UMTS) to the Long Term Evolution (LTE), a new Evolved Packet Core (EPC) will support heterogeneous radio access networks on the same platform. UMTS provides voice services in the circuit switched domain; while LTE operates in the packet switched domain. Cellular ...
Abstract In recent years, the inventions in communication systems require the development of low cost, minimal weight, compact and low profile antennas that are capable of maintaining high performance over a wide spectrum of frequencies. This technological trend has focused much effort in the design of micro strip patch antennas because of its inherent characteristics that fits the requirements of modern communication devices. This dissertation presents the design and simulation of a compact ...
Abstract The proportional, integral and derivative (PID) technique is a reliable and widely used art to control and regulate complex processes. The PID block and signal conditioners are constructed by hand inside a small memory Schneider PLC without inbuilt process control loops using software. Analogue input module of the PLC receives the analogue unconditioned signal from the rtd/thermocouple sensor, passes it through the signal conditioning phase to the pid block. The PID block executes th...
ABSTRACT Sand gravity filters can be automated to suit your requirements. Be it industrial or domestic this model can be implemented with ease. This research is mainly focused on getting sand gravity filters in industries automated using measurable variables like flow and level. The controls are based mainly on monitoring the filter tank level versus the outlet and inlet flows. Inlet flow and outlet flow are regulated to maintain a certain level beyond which the filter tank will be deemed flo...
ABSTRACT Rapid population growths or rural to urban migration and importation of small cheap private cars (mishikashika) has brought a lot of disarray in the public transport sector resulting n increased accidents ,traffic jams and inefficient transportation solutions in most major cities. The traditionally safer bus system is now underutilized and also ne sprouting illegal suburbs which are densely populated are being poorly serviced in terms of transport systems .this project seeks to bring...
Abstract These days, robots, for example, line robot car, mechanical arm, robotic finger and other products were being utilized for several purpose. Robots convey a considerable measure of advantages to the general public, so they are prominently utilized as a part of industry, house and work put. In this undertaking, the outline of wireless industrial robotic vehicle ought to have the capacity to deal with and lift up an object and furthermore can be controlled utilizing remote joystick. The...
ABSTRACT The evolution of technologies in the cellular wireless communication from first generation (1G) to LTE has taken a giant step that other sectors of the industry, social, academia to name but a few, especially in the developing world are struggling to cope. Some countries in the third world are still using 1G and 2G equipment, three or four steps behind LTE, which is more than a quarter of a century lag. The need for engineering students to have hands-on experience on equipment and ma...
Abstract-The importance of recrystallization kinetics in metal process cannot be over emphasized in providing information as to the control of microstructure of materials for purpose of improving or impacting desired mechanical properties in processed materials. In this study, 0.12wt% C steel cold drawn between 20% - 55% were graduallyheateduptoatemperatureof900°C followed bysoakingtreatment between 600 seconds and 3600 seconds in a Gallenkomp® mufflefurnace model SVL-1009 with voltage regu...
ABSTRACT The integrated study involving electrical resistivity method and physicochemical analysis of water samples was carried out to investigate the effect of dumpsite leachate on groundwater repositories around the dumpsites in Ikot Ekpene, Uyo and Eket Local Government Areas of Akwa Ibom State. A total of thirty-three (33) vertical electrical sounding (VES) employing Schlumberger electrode configuration and five profiles of electrical resistivity tomography (ERT) were carried out aro...
ABSTRACT This thesis presented the surface modification of polydimethyl siloxane (PDMS) to enhance surface wettability and surface roughness. Physical and chemical modifications were performed on cured surfaces of PDMS and PDMS-based nanocomposites. Firstly, physical modifications were done by direct coating of PDMS-based substrates with biopolymers such as polyethylene glycol (PEG), poly lactic-co-glycolic acid (PLGA) and sodium alginate (SA). On the other hand, coatings were done with the ...
ABSTRACT Ground State structures of neutral Copper clusters CuN=3−6 were generated and optimised within the framework of the Density Functional Theory (DFT) using Generalised Gradient Approximation (GGA) and ultrasoft pseudopotential. The shapes and binding energies of the clusters obtained showed good agreement with other theoretical works, except for the trimer cluster which has the shape of an equilateral triangle rather than the isosceles triangle as reported in previous works. The opti...