Engineering

Research Papers/Topics in Engineering

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 ...

Student and Teacher Perceptions of Factors Influencing Students’ Performance in KCSE Mathematics in Tana River County, Kenya

ABSTRACTStudents’ performance in Kenya Certificate of Secondary Education (KCSE)mathematics in secondary schools has been poor for many years in Kenya,particularly in Tana River County. Despite the various attempts by the Ministry ofEducation to put in place measures such as in-servicing mathematics teachersthrough Strengthening of Mathematics and Sciences in Secondary Education(SMASSE) project, review of the syllabus and subsidizing fees for the students, theKCSE mathematics mean sco...

Design And Fabrication Of An Electronic System For Monitoring And Controlling Temperature, Light Illuminance And Humidity In A Greenhouse

ABSTRACTClimate uncertainties pose a challenge to the production of food to feed the growing billions on the globe. Climatic conditions can change abruptly ruining farming efforts and leading to food shortages. Greenhouses attempt to solve this problem by enclosing crops in a climatically controlled environment. Crop production in greenhouse environment has the advantage of obtaining reliable and continuous output throughout the year. Each greenhouse has distinct characteristics. Data on thes...

Graffiti Writing And Its Likely Influence On English Language Learning In Selected Secondary Schools In The Larger Laikipia East District, Laikipia County

ABSTRACT Graffiti takes the form of written language whose authorship always remains anonymous. It precisely refers to any wall writing, pictures and symbols or markings of any kind on any surface anywhere no matter what motivates the writer. Most graffiti are viewed as illegal or vandalism of property by those in authority. Secondary school students use graffiti as a form of communication when they feel other channels to express themselves, have been blocked by those in authority. This study...

Performance Of A Modified Vehicle Drive System In Generating Hydropower

ABSTRACT Micro hydropower generated electricity can function as an effective tool for rural development. One of the barriers to smooth implementation of community/village micro hydropower schemes in the country is lack of appropriate hydraulic turbines, thus making the site specific costs of micro hydropower rather high, hence not easily affordable by the rural communities. The purpose of the study was to investigate the use of a vehicle live axle-propeller shaft system to replace conventiona...

Design And Fabrication Of A Greenhouse Monitoring And Control System Based On Global System For Mobile Communication And Bluetooth

ABSTRACT Greenhouse technology should be embraced as a way of minimizing food insecurity in Kenya. The insecurity is brought about by climate uncertainties. Greenhouses have attempted to solve this problem by enclosing crops in a climatically controlled environment. Each greenhouse has distinct parameters. Data on these parameters need to be collected at regular intervals. Depending on the type of crop, these parameters need to be controlled within the specified limits to achieve the ma...


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