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...
ABSTRACT Various energy sources are utilized at present with a challenge of energy storage in many cases. The existing rechargeable storage batteries which include sodium-ion and lithium-ion have some limitations in their gravimetric capacities. This can be improved by incorporating Vanadium disulphide (VS2) due to its metallic properties at ground state. In this work we investigate the adsorption of lithium ions on the VS2 layered material. Research shows that intercalating lithium ions on a...
ABSTRACT Owing to the depletion rates of coastal limestone, the characterization of cementitious materials occurring on the dry land is important in order to assess their potential as alternative materials for the manufacture of cement. In this study, a naturally occurring terrestrial rock herein referred to as “Matisaa gray rock” has been studied to determine its potential for the manufacture of cement. Matisaa gray rock is found in Matisaa village, Kitui County, Kenya, and it covers an ...
ABSTRACT The school curriculum consists of formal, informal and non-formal dimensions. Formal dimension refers to official timetabled subjects such as Physics. Informal dimension is the school environment that influences a learner’s behaviour. Non-formal dimension refers to out of class activities such as field trips and science club activities. The common assumption is that participation in non-formal activities enhances perception and achievement in the formal curriculum. However, seconda...
ABSTRACT Public Universities in Kenya are key players in the training of physics teachers through the Bachelor of Education (Science) programme. However, the training is in need of reforms due to changes in content, educational media and technology in teaching of secondary school physics. Reviews of the programme in public universities have focused on content with little attention to methodology. Further, there is lack of coordination in key areas of training among the universities yet; secon...
Abstract Diurnal variation of vertical total electron content (VTEC) over Lagos, Nigeria (6.52° N, 3.399 E, dip latitude 3.03° S) during low solar activity period (2010) and a comparison with NeQuick-model-derived VTEC, are presented in this paper. VTEC generally increases from 0600 h LT and reaches its maximum value at approximately 1400 to 1700 h LT during all months considered. Our result shows that NeQuick model provide a good prediction during daytime and nighttime at Lagos, although s...
Abstract The electronic, optical and thermal properties of hexagonal and cubic phases of Ge2Sb2Te5 (GST) have been calculated using density functional theory (DFT) as implemented in the QUANTUM ESPRESSO computer package. GST is successfully applied in optical memory such as rewritable CDs and is a promising candidate for non-volatile electronic memory. In optical storage, the reflectivity contrast can be optimized towards the ultraviolet spectral range, thereby increasing data storage capacit...