Abstract In this research an n-type CdxZn1-xS and p-type PbS thin films were optimised for solar cell applications employing chemical bath deposition technique. The thin films were prepared using thiourea and nitrates of cadmium, zinc and lead. Deposition of optimised CdxZn1-xS was done by CBD at 820 C and in alkaline conditions while that of PbS was done at room temperature and both films at normal atmospheric pressure utilizing aqueous conditions. This study concentrated on optimising...
Abstract Consumers’ complaints of estimated bills from the Utility have risen to an alarming extent in recent years. On the other hand, Utility incurs huge losses attributing it to electric energy consumption theft among consumers. These complaints by the utility and the consumer led to the quest for a system that in addition to recording energy consumption data, will be able to compute and report the data to the Utility remotely. This work proposes the implementation of smart meter which ...
ABSTRACT This project work covers the design and construction of a robotic arm mechanically capable of 5 Degrees of Freedom. It solves the problem of automatically detecting and picking up objects placed within distances of 10-30cm round the robot base platform. It does this by using a simplified forward and inverse kinematic relation modeled in two dimensional robot workspace. The work does not cover the more general case, of an n-linked (n>2) robotic arm working within a three dimensional ...
ABSTRACT The problem of epileptic power supply and its consequences in the developing countries is a generally known issue. Worst still, the hope that it will be addressed with the deregulation of electricity Industries in recent time are being dashed by flight to top class investors due to its poor implementation. There is a need to provide multiple sources of power and automatic mechanisms for switching from one source to another. This is achieved in this work where quadruple power supply ...
ABSTRACT A highly structured TiO2/In(OH)xSy/SnS solar cell has been developed based on the Extremely Thin Absorber (ETA) concept. In this set up, TiO2 formed the window layer, In(OH)xSy was used as a buffer layer while SnS was used as the thin absorber film. Its small band gap (~1.3eV) makes it more appropriate for optical absorption. Titanium Dioxide (TiO2) thin films was prepared by spray pyrolysis. Deposition time for TiO2 films varied in the range of 1-4 minutes that gave film thickness o...
ABSTRACT This work evaluated the path losses and strength of received signals of a 3G Network operating at frequency of 2.1GHz in Owerri metropolis using Drive test. There were serious cases of call drops and low Quality of signal (QoS) experienced within some part of the Owerri metropolis. This situation has been burdensome on the side of the network users, as that has made them incur a lot of financial losses and passed through pains. The network providers, on their side, also passed throu...
ABSTRACT Robot becomes widely used in industries due to their characteristics. Robot is able to work in 24 hours continuously without feeling tired unlike human that confine to certain time. The cost to setup the robot nowadays becomes more affordable and their long term prospect is bright judging from their capacity to perform. But in reality, there is no robot able to function perfectly and without making errors. A better controller is needed, to allow the robot performs efficiently and mak...
ABSTRACT There has been a steady increase in demand for clean and renewable energy globally. As a result, more effort has been put into research to harness solar energy from the sun to generate electricity using solar cells. Solar cells convert solar energy directly into electricity. Recent research findings indicate that properties of thin film solar cells strongly depend on the various deposition techniques chemical bath deposition (CBD) being one of them. This technique yields stable, adhe...
ABSTRACT A Mobile Ad-Hoc Network (MANET) is a popular type of wireless network that is formed by a collection of mobile nodes. Each node in such network has the capability to communicate with its neighbors and nonneighbors through a wireless medium designed to accommodate the properties of a self-organized environment without protection against any inside or outside network attacks. In addition to, it does not have any central authority to ensure that any node in the network it is not malici...
Abstract A Long Term Evolution (LTE) technology is the most possible candidate for next generation mobile wireless communications. One impairment of LTE is an interference from neighboring cells, so called Inter-Cell Interference (ICI). In this thesis Fractional soft FFR technique has been introduced for better utilization of frequency spectrum. In addition, beamforming technique is considered to be the solution to improve the performance of wireless communication systems, this thesis propos...
Abstract The demand was exceeded for speed to transmitting data, capacity and low cost that means there was a problem. The offers solution of limitation field in optical networks using Wavelength Division Multiplexing to increase the capacity and find the most cost-effective combination by designing four scenario unidirectional optical fiber(2,4, 6, and 8) users. In scenario four used Eridium Doped Fiber Amplifier to evaluate the system performance and study the effect of difference fiber le...
ABSTRACT This work present the design, construction and testing of a simple burglar alarmactivated by light, break beam and pressure sensor. The principle of operation of this burglar alarm is simple. When the ray of light falls on the light sensor the alarm is triggered and the siren begins to operate, the speaker beeps and the flasher (light) flashes. When an intruder walks through the break beam sensor the alarm is triggered and the siren begins to operate, the speaker beeps and...
ABSTRACT Achieving seamless homogeneous handover in mobile WiMAX due to its low cost and state of the art technology will enable ubiquitous broadband access to high volume applications especially with the high global increase in mobile subscribers. Extending this seamless handover across network technologies-heterogeneous handover- like WiFi will further lower cost, improve battery life and enable high productivity for end users. In this project, ways of optimizing handover in mobile WiMAX n...
ABSTRACT This thesis “Short Messaging System(SMS) Based Information Search and Retrieval System” describes a technology facility that will enable local information to be collected and put in a repository system (Database) such that a mobile user using the facility will be able to search for such information from any location where Global System for Mobile Communications(GSM) services are available. The work concentrates on developing the server-side program that will run as the search pro...
ABSTRACT The broadcasting stations in Nigeria often encounter sudden failures, which results in loss of signal that causes the station to experience down-time. Causes of the failures could be traced to the issues that range from erratic power supply to degradation in the studio equipment. Each failure and its consequent down-time influences the reliability of the station. In our environment (Nigeria) reliability does not only depend on the established parameters, instead it includes paramete...