Centre for Promotion of Educational and Scientific Research
Mechanism of Carbonation in Concrete and its Prediction–A Review
Alhassan, Yunusa Aminu 1-37
Characterization of Mayo-Butale and Walol-Kolel Graphite of
Adamawa State
Taru Tizhe Tatas, Bello Zubairu and Aliyu A. Baba 38-46
Image Deblurring using Wiener’s Filter
G.N. Udealor & B.E. Zakka 47-69
Theoretical Evaluation of Evaporative Cooling Potential Using
Feasibility Index Model
Ibrahim, U.H. and Ibrahim, A. 70-82
Ibrahim, U.H1. and Ibrahim, A2.
1 Department of Mechanical Engineering, Federal Polytechnic Mubi, Adamawa
2Department of Physics, Adamawa State University, Mubi, Adamawa State, Nigeria
Email: Ibrahim U.H. E-mail: heldabuk@yahoo.com
Abstract: Thermal comfort has a great influence on the productivity and satisfaction of indoor building occupants. In some developing countries like Nigeria, poverty and epileptic power supply are the twin problems impeding people from the use of refrigerated-based air conditioning systems to achieve thermal comfort. Furthermore, the use of some refrigerants has adverse effect on the environment. Evaporative cooling systems are viable options for achieving thermal comfort especially in hot and dry climates. These systems, apart from their low cost and power requirement, they are environmentally friendly. This study attempts to determine the viability of using evaporative cooling to achieve thermal comfort in Mubi-South using the feasibility Index model. The computed feasibility indices of the study area in the months of January through December are – 0.08, – 1.62, 4.04, 13.09, 27.06, 17.36, 18.39, 18.42, 18.24, 3.12, – 0.12 and – 0.28 respectively. Employing the concept of the feasibility index (FI) model reveals that comfort cooling can be achieved in the months of January, February, March, October, November and December while relief cooling can be achieved in the month of April. The model also reveals the unsuitability of evaporative cooling in the months of May, June, July, August and September. Considering both the comfort and the relief cooling periods based on the FI model, evaporative cooling can therefore be a suitable alternative to refrigerated-based air conditioning systems in Mubi-South and other areas with similar climatic characteristics.
G.N. Jola1 & B.E. Zakka2
Electrical Electronics Engineering Department, Federal Polytechnic Bauchi
Computer Science Department Federal Polytechnic Bauchi, Nigeria2
Email: gloriangjola@gmail.com1 Byikawe@yahoo.com2
Abstract: Image blur is difficult to avoid in many situations and can often ruin a photograph. Thus Image deblurring and restoration is necessary in digital image processing. Blur is a form of bandwidth reduction of an ideal image owing to the imperfect image formation process. This is due to the fact that there is a lot of interference in the environment as well as movement during the image capture process, by the camera or, the when long exposure times are used, by the subject, Out-of-focus optics, use of a wide-angle lens, atmospheric turbulence, or a short exposure time, which reduces the number of photons captured and scattered light distortion in confocal microscopy. This work seeks to reduce the possibility of taking blurry images by developing a Wiener filter algorithm for image deblurring process using MATLAB
Taru Tizhe Tatas1, Bello Zubairu2 and Aliyu A. Baba3
1&2 Department of Chemical Engineering, Federal Polytechnic Mubi, Adamawa State,
3Department of Mechanical Engineering, Federal Polytechnic Mubi, Adamawa State,
Email: adamuldam@gmail.com
Abstract: Graphite sample from Mayo-Butale and Walol-Kolel were beneficiated by froth floatation and a yield of 52.1% and 62.65% were obtained for the two samples respectively on a second float. On aching the carbon content was improved from 36.6% and 33.6% for the raw samples to 85.0% and 83.4% for the beneficiated samples. Chemical analysis of the ash using X-ray fluorescence (XRF) showed that SiO2, Fe2O3, and Al2O3 were present in high quantity. Others present in low quantity were K2O, CaO and TiO2. On determining the powdered density of 2280Kg/m3 and 236oKg/m3 were obtained for the two samples which compares favorably to 2260Kg/m3 for pure graphite. Micro structural studies revealed that the two graphite samples had a flake size of 0.5mm.
Alhassan, Yunusa Aminu
Department of Civil Engineering,
Federal Polytechnic Idah, Nigeria
Email: enejoking@gmail.com
Abstract: This paper examines the process of carbonation in concrete as while as factors that influence carbonation progression in concrete. Quantification of carbonation process in an inland environment and basis for the derivation of the carbonation progression rate in concrete were also reviewed. The paper then x-rayed extensively existing carbonation prediction models and finally it proposed an approach for the development of carbonation prediction model for reinforced concrete structures located in an inland environment.
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