In this thesis, experimental measurements were carried out to determine the radiation induced effect on the electrical properties of silicon based diode type 1N4007. The gamma ray photons of Cs-137 source were used to irradiate the diode under test. The results in terms of IV characteristics were compared for post and pre irradiated diode. It is found that the forward current has increased with respect to operating voltage (0.7V) by about 42%. Furthermore, the possibility of using cemen...
ABSTRACT Core-shell oxide thin films of TiO2/MnO, TiO2/CoO, TiO2/NiO and TiO2/CuO have been successfully synthesized and deposited on glass substrates, using the chemical bath deposition [CDB] technique. To ensure uniform coating, surface pre-treatment was carried out by cleaning slides with detergent, deionised water, ammonia acid and rinsed with acetones. The core of the films was synthesized from TiCl3, NaOH and PVA while the shells were synthesized from MnCl2.4H2O, CoCl2.6H2O, NiSO4 and ...
ABSTRACT The Northwest Olkaria prospect, Oserian Sanctuary, is part of the Greater Olkaria Geothermal Area located within the Kenyan rift valley in Nakuru County. It is bounded by the longitudes 360 15′E and 360 12′E with an estimated area of 30 km2. Studies previously done did not adequately cover the area to the North West hence no geophysical data is available on the resistivity of key concealed geothermal structural features like thin massive heat sources and shallow faults based on s...
ABSTRACT The sun emits ultraviolet radiation in the form of ultraviolet-A (UV-A), ultraviolet-B (UV-B), and ultraviolet-C (UV-C) bands. Ultraviolet light has the potential to boost vitamin D2 production in mushrooms which are the only non-animal food source of vitamin D for humans. The ergosterol in mushrooms, a component of fungal cell membranes which serves the same function as cholesterol in animal cells, can be converted into vitamin D2 by exposure to controlled UV light. However, mushroo...
In this dissertation, we derived the Renormalization Group Equations (RGEs) for five dimensional Minimal Super-symmetric Standard Model (MSSM) plus additional fields . We found a successful unification of gauge coupling constants in this model very close to: GeV. Yukawa couplings seemed to be tending to unify at some high scale and approximately vanish beyond the unification scale of the gauge couplings, i.e. GeV. We showed that a five dimensional (5D) MSSM with compactification scale o...
ABSTRACT One of the objectives of x-ray examination is high quality images; however administered radiation doses may be harmful to patients‟ health. Data on radiation dose to patients are scarce, and thus hinder the determination of local and national reference dose levels specific to a country owing to the differences in patient anatomy and radiological practice among nationals of different countries. This study was therefore, designed to determine the patient doses, local reference dose ...
ABSTRACT The NaI(TI) gamma-ray spectrometer was employed to determine the concentration of the naturally occurring Potassium(K-40). Uranium(U-238) and Thorium(Th-232) vis-a-vis the radiogenic heat production in soil samples from Idi-Omo farmland area of Akinyele Local Government area of Oyo state. The farmland which is at Latitude 070 30' 26.3" and Longitude 003" 5 7' 2 1.9" covers an area of about 80,000 square meter, and is at an average elevation of 240m above mean sea level (msl). The s...
ABSTRACT Geophysical survey techniques have successfully been applied to near-surface limestone detection in karstic terrains. A magnetic geophysical survey to delineate the karstic structure of the Nyanda Mountains, Masvingo, was carried out in the interest of mapping out limestone deposits required for cement production. The magnetic-total-field-anomaly maps helped reveal the metamorphic and sedimentary units in the study area. Although only part of the mountain range was surveyed for this ...
Abstract The source of contact details of public and private organizations used to be the telephone directory. The telephone directory would contain the physical location of the organization as well as the telephone number. With the advent of the mobile phones whose use has grown exponentially, the fixed network market share has declined drastically. And so is availability of the telephone directory. This proposal is to develop a service provider’s directory accessed by mobile phone using t...
ABSTRACT This project work presents the design of an automated room temperature controller system. This system allows the user to set a desired temperature which is then compared to the room temperature measured by DHT11 temperature sensor. With the help of Atmega 328 based on Arduino microcontroller, the system responds by turning ON and OFF the two (2) loads (fan or a heater) automatically depending on the temperature difference in the room. The fan is triggered ON when the room temperature...
ABSTRACT Ceramics are inorganic, nonmetallic solids and crystalline amorphous materials whose molecules are held together by covalent bond and /or ionic bonds. They are usually; hard, brittle, stable to high temperatures, less dense than metals, more elastic and have very high melting points. Ceramics are mostly made from clay soil. Ceramic water filtration involves the use of a porous ceramic (annealed clay) medium to filter microbes and other contaminants from water. The ceramic water filte...
ABSTRACT Thermodynamic properties of the multiband high critical temperature superconductors have been describedpreviously with simple standard BCS expressions corresponding to and bands, but the microscopic mechanisms that allow superconductivity to persist at high temperatures remain unknown. Studies on two band superconductors have previously been described through one band model; this approach has not adequately addressed cases of inter-band scattering for superconductors at high temperat...
ABSTRACT The variability of background radiation from primordial radionuclides has led to the exposure of human beings to radiation doses of different ranges. Prompt or delayed harmful effects as a result of radiation exposure have been reported in areas with enhanced levels of radioactivity. The residents of Kitui County near Tyaa River and the surrounding regions heavily mine sand and rocks from its riverine for construction purposes despite the scanty information on the potential harm in c...
ABSTRACT Thermodynamic properties of the multiband high critical temperature superconductors have been describedpreviously with simple standard BCS expressions corresponding to and bands, but the microscopic mechanisms that allow superconductivity to persist at high temperatures remain unknown. Studies on two band superconductors have previously been described through one band model; this approach has not adequately addressed cases of inter-band scattering for superconductors at high temperat...
ABSTRACT The ionosphere is the ionized portion of the atmosphere that stretches from about 50 km to 1000 km above the ground. It plays a very important role in the solar effects felt on Earth. Despite various studies having been carried out on occurrence of Equatorial plasma bubbles (EPBs) in Africa, more research needs to be done within East Africa since the ionosphere is a highly variable medium resulting from ionizing radiation from the Sun and changes from region to region. The problem in...