Browsing by Author "Abdulbaqi T ABDULRAHIM"

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    Heat Stress as A Measure of Human Level of Comfort in A Semi-Arid Zone, Maiduguri, Nigeria
    (Research | Reviews | Publications, 2012) Abdulbaqi T ABDULRAHIM; Richard B MSHELIA; Olajide G STEPHEN; Emmanuel T KYAUTA
    This study examined thermal stress and physiological comfort in Maiduguri, Nigeria using thermal heat stress index as a measure of human comfort. Dry-bulb temperature, Relative humidity, and Air velocity were measured in three observatory sites (class room, under neem (azadirachta indica) tree and under direct sunlight) within the Faculty of Engineering University of Maiduguri, Nigeria between the hours of 7.00 am and 5.00 pm on some days from October to December 2010 in order to establish the physiological responses to thermal stress and disorder. The data were analyzed using Effective Temperature (ET) and Relative Stress Index (RSI). The mean ET mean ET obtained vary from 23.58oC to 31.18oC, while the RSI values vary from 0.12 to 0.49 for the period just after the raining season. And for the hammatan period, the mean ET mean ET vary from 19.31oCto 29.09oC , while the RSI values vary from-0.01 to 0.38. The results showed that the three locations are generally comfortable during the morning hours and become uncomfortable as the day progresses. The class room was found to be the most comfortable during the period of the investigation while the location under the sun recorded the highest level of discomfort in both seasons.
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    Modelling and Simulation of Low Calorific Value Municipal Solid Waste Incineration
    (Research | Reviews | Publications,, 2012-09) Mohammed B OUMAROU; Abdulbaqi T ABDULRAHIM; Mohammed DAUDA
    The paper focused on the mathematical modelling and simulation of low calorific value municipal solid waste incineration in semiarid region. Municipal solid wastes were collected and analysed; from which wood samples were taken and incinerated using a prototype incinerator. A mathematical model, based on Fourier series (FS) and finite elements method (FEM) was developed, ran and validated using experimental and literature data. Critical minimum volume of 4.93 m3 or about 6 % of the total volume of the incinerator would be needed at 20% moisture content refuse and a critical maximum volume of 51.10 m3 or 69.21% of the total volume, would be needed at 50% moisture content. The ignition time and the time at which the combustion becomes self-sustaining are greatly influenced by the moisture content. Critical drying temperature was found to be 711.44 K. The grid size had little or no effect on the simulated results. The developed model can accurately predict the critical sizes and performance of the actual plant even at its virtual stage. There is need to optimize the critical drying temperature and mathematical model /physical model correlation which would help improve the efficiency of the process and better understand the drying mechanism involved.
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    Municipal Solid Waste Generation, Recovery and Recycling
    (Research | Reviews | Publications, 2012-10) Mohammed B OUMAROU; Mohammed DAUDA; Abdulbaqi T ABDULRAHIM; Alhaji B ABUBAKAR
    The paper presents a case study focused on waste generation, material recovery, and the recycling potential of municipal solid waste in Maiduguri, Nigeria. The municipal solid waste (MSW) generation was estimated using a fuzzy logic based mathematical model followed by a collection scenario thought of, adopted and tested within two planned residential areas; the University of Maiduguri campus and the 202, 303 housing estates of the Maiduguri metropolis. Data obtained were analyzed using simple statistical methods. The mathematical model predicted 255 tonnes of MSW against 226.63 tonnes by collection estimates. An important amount of recyclable materials was found to be generated within the study area. Incurred fuels expenses on the trucks alone, do exceed the monthly wages of 400 waste collectors. MSW collection, material recovery and recycling are alternatives to fight poverty, and contribute immensely towards social re-insertion of marginalized people. Further research is needed on the waste production equation for estimates of waste generation in not well planned areas.