Engineering

Research Papers/Topics in Engineering

Optical And Electrical Characterization Of Cdxse1-Xs And Cu2sthin Films For Solar Cell Application

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...

E-Learning Adoption And Utilisation: A Comparative Study Of Kenyatta University, Kenya And University Of Cape Coast, Ghana

Abstract Although e-learning provides enormous opportunities, its implementation in Universities in the developing world is low. Many people are sceptical about its effectiveness to serve as an alternative means to attaining higher education. There are limited studies within developing countries centred on e-learning adoption and utilisation. This study sought to find out the major challenges facing e-learning adoption at the Centre for Continuing Education (CCE), University of Cape Co...

Availability And Use Of Community Resources For Teaching Business Studies In Secondary Schools In Ruiru District Kiambu County,Kenya

ABSTRACT Community resources when used in teaching and learning enhance understanding and retention. This study examined the availability and use of community resources in teaching Business Studies in secondary schools in Ruiru District Kiambu County Kenya. A descriptive research method was adopted. A sample of 10 principals, 10 Business Studies teachers and 100 students was drawn from a target population of 1222 respondents. Data was collected using interview schedule for Principals an...

Design Of An Fm Bugger Circiut

ABSTRACT FM bugger is a device which generates frequency modulated signal. It is one element of a radio system which, with the aid of an antenna, propagates an electromagnetic signal. Standard FM broadcasts are based in the 88 - 108 MHz range. The signal (from the microphone) is fed into the audio frequency (AF) for amplification then to the modulator which combines the modulating signal with the carrier wave transports the modulated signal through (RF) for final amplification to t...

Design Of An Intelligent Room Light Controller With Bidirectional Counters For Energy Efficiency Applications

ABSTRACT Despite the installation of light energy waste control systems in modern buildings, many people end up paying for high energy bills. The cost of installation of these systems is usually high, and most of them are inefficient making it a major concern to the normal user. Due to technological advancement, sensors and microcontrollers are employed in a wide range of applications. This includes domestic and industrial fields where they aid in control of automated processes. In thes...

Optimum Artificial Lift Selection for Condensate Gas Well

The reservoir characteristics of the gas condensate well is special and the changes of the behavior of the well have a significant impact to the production rate. When we do a proper optimization that can lower the operating costs, maximizing HC recovery and the net present value of a project can be increased. The optimization of the well level can be accomplished by adjusting well parameters such as tubing size, wellhead and the skin factor. All of these parameters were investigated wi...

Design And Fabrication Of Aperture Coupled Microstrip Patch Antennas With Arbitrarily Shaped Apertures

ABSTRACTA linearly-polarized aperture coupled microstrip antenna design is characterized and optimized using FEKO antenna simulation software. One of the major drawbacks of these microstrip antennas is their narrow bandwidth. Aperture coupled being one of the feeding technique has proven to be a solution to this problem. In this research a patch antenna that is coupled to a microstrip-line by an aperture in the intervening ground plane has been designed and fabricated and implemented. The sha...

Characterization Of Cdxse1-Xs/Pbs Thin Films Deposited By Chemical Bath Deposition For P-N Junction Solar Cell Application

ABSTRACTThe CdS and PbS are of great research interest due to their outstanding electronics andoptical properties such as winder energy band gap phase and good antireflective propertiesrespectively. CdS has been earlier doped by Zn and used as a window layer combined withPbS as the absorber material using the CBD method. It realised an efficiency of 0.9. It isfor this reason in my research, I doped CdS with Se in the fabrication of CdxSe1-xS/PbS PNjunction for solar cell application to ...

The Cavitation Effect in Centrifugal Pumps

ABSTRACTCavitation in a centrifugal pump has a significant effect on pump performance.Cavitation degrades the performance of a pump, resulting in a fluctuating flow rateand discharge pressure, that reduces pumps efficiency and the operating life of thepump, In this research the effects of cavitation on pump performance was studiedon the power required ,efficiency , volume flow rate ,and the head , using a 3-Dsimulation by ANSYS (fluent flow) software for two phase flow (the water and it...

Simulation And Optimisation Of A Drying Model For A Forced Convection Grain Dryer

ABSTRACTForced convection grain dryers are more efficient and achieve greater drying rates than natural convection dryers. However, it is necessary to provide an appropriate solar air heater in order to achieve the required drying air temperature. Well sized fan and drying cabinet, as well as an optimal combination of air velocity, temperature and grain layer thickness are also essential for improved performance of such a dryer. In order to predict variation of moisture content with time duri...

Development Of Biomass Wastes Briquette Stove For Domestic Use

ABSTRACTBiomass energy in the form of woodfuel and charcoal contributes close to 68% of the total energy demand in Kenya. The continued depletion of biomass resources has led to the use of agricultural residue to supplement energy needs for domestic cooking. Biomass stoves used to burn these fuels in Kenya are characterized by high inefficiencies and high emissions that pose environmental and health risks to the users. This research aimed to reduce biomass fuels consumption, reduce fuel indoo...

Optical And Electrical Analysis Of Cd1-Xfexs/Cus P-N Junction For Solar Cell Application

ABSTRACTThe rapid population growth in Kenya and the world in general has led to very high energy demands; this has necessitated urgent exploration of other alternative energy sources. Solar energy is one such alternative that has not been fully utilised hence many researchers have developed much interest in them. Solar cells absorb light from the sun and convert it in to useful electrical energy however the challenge has been how to harness it as well as the very low efficiencies recorded by...

System Sizing Of Solar Energy Requirement For An “All-Direct Current” Stand-Alone Telecommunication System

ABSTRACTSolar photovoltaic (PV) energy has been widely used for decades especially where connection to a national grid is seldom possible and other sources such as fossil fuel and others are either unavailable or uneconomical. Solar PV energy owing to its free, natural availability and environmental friendliness has found demand for use in industries, homes and institutions. However, very little research has been carried out to precisely establish its effectiveness, reliability and adequacy. ...

Design And Analysis Of Microstrip Antenna For 2.4 Ghz Applications

ABSTRACTCommunication systems require development of low cost, low profile and minimal weight. Microstrip antennas (MSA) are capable of maintaining high performance over a wide spectrum. Technological trends have focused much effort on the design of the microstrip patch antennas. In this study, square, circular and rectangular patches were designed and analyzed using two different substrates. High Frequency Structure Simulator (HFSS) software was used to simulate, model and analyze the MSAs. ...

Analysis Of Microstrip Antenna Using Arbitrarily Shaped Patches Having Similar Surface Area

ABSTRACTMicrostrip patch antenna(MSA) has become very vital in communication system due to its attractive features such as its light weight, small size, low cost, low profile, ease of installation and its conformability to planar and non planar surfaces, when a particular mode and shape is selected. MSA are versatile in terms of resonant frequency, impedance, polarization and electromagnetic wave pattern. However, MSA have been found to suffer from relatively narrow bandwidths. The consumers ...


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