ABSTRACT The PID controller still remains a widely used and very effective means of achieving stability in control systems. Generally, the performance of the controller is determined by the proportional, integral and derivative gains of the controller. The classical techniques: ZieglerNichols (ZN) open loop method; ZN closed loop method; Chien-Hrones-Reswick (C-H-R) load rejection method; and meta-heuristic technique: the fuzzy logic algorithm, are used to determine the tuning parameters of ...
Abstract In the last half decade data traffic has surpassed voice traffic in telecommunications networks. Legacy networks could not cope with the overwhelming data traffic and exponential increase in subscribers. To address legacy systems limitations in this regard 4G LTE was introduced. With reduced network elements and advanced robust modulation technologies 4th generation systems offer data speeds much more than 3G and wired networks. In addition, 4G offers a variety of services which coul...
BSTRACT Phytosynthesis of TiO2 NPs from Ximenia Caffra leaf extract and their application in poultry feeds as an antibacterial agent was done. Reaction time and pH effect for the synthesis of TiO2 NPs were optimized using a single factor method. A Central Composite Design (CCD) was used to determine the effect of linear factors (titanium tetrachloride concentration, temperature and leaf extract volume) and their interactions on the synthesis of TiO2 NPs. A total of twenty experiments formulat...
Abstract This research work studied the behaviour of Africom’s converged network, measured and evaluated the QoS of service of the network with the various traffic streams. Its objective was to identify and measure the different metrics that affect the delivery of QoS in the network. Parameters for measuring QoS were be identified and measured and the overall performance of the network evaluated. The approach that was adopted was guided by the subscriber concerns as well as the technical pa...
ABSTRACT A new simple novel electrochemical sensing platform based onelectrodeposition ofnano zinc oxide ontomultiwalled carbon nanotubes modified glassy carbon electrode was constructed. The modified electrode was characterized by cyclic voltammetry and electrochemical impedance in a redox probe.The electrode surface area after modification was 0.15 cm2, which was twice large that of a bare glassy carbon electrode. The new fabricated sensor was applied for individual and simultaneous determi...
ABSTRACT This research looks at the prison community as a discourse community. The study also provides a sociolinguistic analysis of the language used at Whawha Medium Offenders Prison. Through the analysis of language the study also explores certain aspects of prison life at Whawha prison complex. The study uses the ‘sociolinguistics theory’. The research examines Whawha Prison Complex as a discourse community, investigates how the inmates at Whawha Prison Complex use language in a pecul...
ABSTRACT This report serves to give an account for a research on a Public Transport Inventory Monitoring System for Developing Countries. The research is based on the current situation in Zimbabwe where the public transport industry is dominated by the informal sector. In this document there is a discussion of the transport industry in Zimbabwe, identification of the problem of accountability of inventory in the current industry, a methodology to help solve the problem and the results of usin...
ABSTRACT The research focused into the impact of Information and Communication Technology (ICT) based technologies in the teaching and learning at Early Childhood Education (ECE) level settings in the context of the new curriculum in Bulawayo Urban schools. The study was conducted at Riverside Stimulation Centre in Imbizo District in Bulawayo Metropolitan Province. Ten ECE teachers formed the sample. Questionnaires were used to gather information from teachers. Focus groups interviews were us...
ABSTRACT The kinetic analysis of three complex reaction networks of catalytic reforming reaction systems has been studied. The complex systems of reaction networks were first fashioned into a system of single reactions. Each single reaction is then delineated into a sequence of elementary reaction steps. The principles of rate determining step, steady state approximations and microscopic reversibility were then involved for necessary simplifications Kinetic and equilibrium parameters for mode...
ABSTRACT An electrochemical sensor based on polyaniline cobalt phtahlocyanito doped with cobalt oxide nanoparticles was developed for the electrocatalytic oxidation of amitrole.FTIR, Electrochemical impedance spectroscopy (EIS) and Bode plots were used in the characterization of the synthesized modifiers CoTCPc, PANI, Co2O3NPs and to ascertain the chemical linkage between CoTCPc and PANI while cyclic voltammetry, linear sweep, chronoamperometry and differential pulse voltammetry were used to ...
ABSTRACT This work improves upon the Potential Field Method (PFM) for the navigation of autonomous mobile robots, through the introduction of a new Hybrid Virtual Force Field (HVFF) concept. The HVFF concept integrates the virtual force field (VFF), which is based on the principles of artificial attractive and repulsive potentials, with the virtual obstacle concept (VOC) and the virtual goal concept (VGC). In particular, the specific challenges resolved by the HVFF include the local minimal p...
ABSTRACT Two Dimensional Laminar Free Convection in a fluid contained in a long horizontal right triangular enclosure has been investigated using numerical techniques and an experimental study. The geometry of the enclosure is such that the base is assumed horizontal while the vertical height is adiabatic. Motion in the region is set up by heating the hypotenuse while cooling the horizontal wall. This model simulates heat transfer problems associated with pitched-roofs with suspended ceilings...
Abstract In Zimbabwe television (ZTV) transmission coverage is approximately 55% nationwide and is mainly confined to urban areas. The dissertation overviews activities of the author’s design of a solar tv transmitter prototype which will act as gap filler in remote areas where there is no television coverage. Due to recent progress in the field of Wireless Sensor Networks (WSN) in industry particularly for control and data processing, the same goal can be achieved in television broadcastin...
ABSTRACT The internet has become a key resource at Midlands State University for research and communication. The institution is also experiencing high students‟ population which in turn has led to more demand for bandwidth. The high students‟ population makes the overall available bandwidth shrink leading to slow internet connection making internet an ineffective academic resource. The institution has been responding to slow internet connection by buying more bandwidth which is so unecono...
ABSTRACT An electrochemical sensor based on nickel tetraamine phthalocyanine and nitrogen doped grapheme oxide (NITAPC-NDGONS (mix)) nanoparticles was developed for the simultaneous electrocatalytic oxidation of vanillin and ascorbic acid. FTIR (Fourier Transimition Infrared), electrochemical impedance spectroscopy (EIS) and Bode plots were used in the characterization of the synthesized modifiers (NITAPC), (GONS-NITAPC) and NITAPC-NDGONS (mix)). Cyclic voltammetry, linear sweep, chronoampero...