Abstract: Botswana has about 84 % of its land area as part of the semi-arid Kalahari desert and it experiences over 320 clear sky days per annum, with a solar insolation of 21 MJ/m2 per day on a horizontal flat surface. This favors energy generation using concentrated solar thermal technologies, especially parabolic trough collector (PTC). PTC is the most mature technology and contributes up to about 90 % of installed concentrated solar thermal power in the world. A PTC prototype was fabrica...
Abstract In this work the optical properties of two group of samples were studied. In the first group Zinc Oxide was doped by ( Al ,Cd, Co, Li and Mg ). In the second group Titanium Oxide was doped by ( Al ,Cd, Co, Li and Mg ) also . The optical characteristics where investigated by using UV spectrophotometer and some computer programmers . The efficiency of the solar formed from this samples using ITO were found using light current and voltage .The study shows that the absorption peaks of t...
Abstract Scale, sludge and sand samples were collected and analysed using thallium activated sodium iodide NaI(Tl) spectrometer to determine type, activity concentration, absorbed dose rate and annual effective dose of naturally occurring radioactive material (NORM) of samples collected from oil fields at West Kourdofan state. Scale radionuclides was found to be, 238U, 232Th and 40K at concentrations ranged from (4106.9 - 358.05) Bq/Kg, (2736.7 - 375.88) Bq/Kg and (9294 - 16.07) Bq/Kg respec...
ABSTRACT Solution growth technique was used to deposit thin films of Manganese Suphide (MnS), Calcium Sulphide (CaS), Magnesium Sulphide (MgS), Barium Sulphide (Bas), Zinc Fluoride (ZnFz) and Calcium Oxide (CaO) on micro-slides (Substrates) at different bath parameters which include temperature, molarity of solution, Volume of solution and water, time of d.eposition and pH. The absorbance, A was measured using spectrophotometer ranging from ultraviolet to visible regions. The Transmittance, ...
ABSTRACT This study analyzes and compares the simulated performance of a 3.2 kWp grid-connected photovoltaic system. The system is located within coordinate of 12°15’N 7°30’E, at Government Day Secondary School Kofan Yandaka Katsina State Nigeia. The system consists of 14 Mono crystalline silicon modules connected in two strings of 7 seriesconnected modules, each facing north at a fixed tilt of 20° .The simulation is performed using Meteonorm generated weather data. The performance of ...
ABSTRACT A fully automated X/S band Mission Control Centre (MCC) for the Nigeriasat-2 (N2) and Nigeriasat X (NX) satellites was constructed in Abuja. The construction of the MCC consisted of the installation of the appropriate size of antenna and computer systems used for the control of the entire satellite mission. The MCC of N2/NX consists of three main segments: the ground station (GS) used for direct communication link with the satellite, the mission control suit (MCS) used for mission co...
Abstract A nanocrystalline and porous p-Polyaniline/n-WO3 dissimilar heterojunction at ambient temperature is reported. The high-quality and well-reproducible conjugated polymer composite films have been fabricated by oxidative polymerization of anilinium ion on predeposited WO3 thin film by chemical bath deposition (CBD). X-ray diffraction analysis of the deposited WO3 films revealed that as-deposited film was amorphous; however, an amorphous-to-crystalline phase transition was observed by r...
ABSTRACT The aeromagnetic data of Chibok (sheet 134) and Damboa (sheet 112) areas, southern Chad basin were interpreted qualitatively and quantitatively. Spectral Analysis, Source Parameter Imaging (SPI), Standard Euler deconvolution, Forward and Inverse modelling methods were used in the quantitative interpretation with the aim of determining depth to the magnetic source bodies, magnetic susceptibilities and the possible mineralization in the area. Oasis Montaj 6.4.2, WinGlink 1.62.08, Surfe...
ABSTRACT Solution growth technique was used to deposit thin films of Manganese Suphide (MnS), Calcium Sulphide (CaS), Magnesium Sulphide (MgS), Barium Sulphide (Bas), Zinc Fluoride (ZnFz) and Calcium Oxide (CaO) on micro-slides (Substrates) at different bath parameters which include temperature, molarity of solution, Volume of solution and water, time of d.eposition and pH. The absorbance, A was measured using spectrophotometer ranging from ultraviolet to visible regions. The Transmittance, T...
ABSTRACT Statistical, analytical and numerical methods have been used to develop a model for phenomenology and dynamical evolution of Compact Steep Spectrum (CSS) sources through the ambient medium of density, e n , within a characteristic time, T . Results show that the empirical relation between spectral turnover, n p , and D implies that 0.34 n p e ~ n , suggesting that the spectral turnover constitutes a characteristic signature of dense gases around CSS sources. However, since the charac...
ABSTRACT Galactic cosmic rays are modulated in the heliosphere primarily due to the global merged interaction regions with intense magnetic field which leads to a decrease in the galactic cosmic rays throughout the heliosphere. Using long term averages of solar wind (SW) component parameters in addition to cosmic ray count rates of two high latitude Neutron monitor stations (Apatity and Thule) and two mid latitude stations (Newark and Tbilisi) with different rigidity cut-offs, we analyzed the...
ABSTRACT The radionuclides present in soil, water and selected foodstuffs taken from all the thirty local government areas of Osun State have been identified and their activity concentrations measured in order to calculate, the absorbed dose, collective effective dose equivalent and committed effective dose for the estimation of the potential biological risk/damage of naturally occurring radionuclides in the State. One hundred and twenty six samples each of soil, water, yam flour, cassava flo...
ABSTRACT In this work, we report on the synthesis of Zinc Oxide (ZnO), by a cost effective and low temperature aqueous chemical method on conducting glass substrates. The grown nanostructures have been characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), optical absorption techniques and Raman spectroscopy. Resistivity of the films was studied with I-V data for the ZnO samples. SEM images show the formation of flower, bud, star,...
ABSTRACT Dye sensitized solar cells (DSSCs) have been under extensive research. Since the color of the device can be easily varied by choosing different dyes and cells on flexible substrates, DSSCs are especially attractive for Building Integrated Photovoltaics (BIPV). The cell concept is believed to reduce the production costs and energy payback time to a large extent compared to standard silicon cells or other thin film cells. Dye sensitizer absorbs the incident sunlight and exploits the li...
Abstract In this research work, sol-gel technique was used to grow some crystals of halide and chalcogenide compounds. These grown crystals were doped with locally produced dopants from bamboo, raffia and potash to see how they can affect the optical and structural properties of the crystals. Dopants were produced from local materials using top down approach where bulk materials (bamboo, potash and raffia) were whittled down through burning into carbon dioxide, water and residual ashes contai...