Browsing by Author "Bello, R. O."

Now showing 1 - 3 of 3

Appraiser of roadsid carpentry workshop in Iwo, Osun state, Nigeira
(2012) Adewole, N. A.; Bello, R. O.
Cardiovascular disease has been recognized as the world’s leading cause of death and disability accounting for about 40% of all human mortality. Cardiac arrhythmia is a name for a large family of cardiac behavior that shows abnormalities in the electrical behavior of the heart. Cardiac action potential depicts the electrical wave propagation within the heart. This work presented the mathematical modeling of the action potential within the human cardiovascular system. The electrical activity of the heart is best mathematically modeled by coupled systems of differentials equations consisting of ordinary differential equations(ODEs) and partial differential equations (PDEs), mainly reaction-diffusion types. These equations are non-linear and present themselves as stiff problem, hence, difficult to solve numerically. More so, whole heart simulation using these models is a challenging scientific computing problem due the complex geometry and small scale details of human heart. In this work, the bidomain model was adopted for the modeling due to its ability to reflect the actual wave propagation in the cardiac tissue. The bidomain model was coupled with FitzHugh-Nagumo’s ionic model and then discretized in time using the explicit forward Euler method. A 2-D Java-based computer program was developed to simulate the adopted model. The generated wave was compared with the theoretical standard. The obtained results are very useful in that they provided valuable information on cardiac arrhythmias
Design and Construction of a Lyophilizer system using locally available material
(Nigerian Society of Engineers, 2017) Bello, R. O.; Raji, A. O.; Oyefeso, B. O.
A lyophilizer system was designed and constructed with a galvanized metal sheet to reduce the cost and to make it available to local and poor food processors. It consists of 330.2 mm x 508 mm x 457.2 mm rectangular shaped chamber with the inner and outer layer reinforced with a hollow mild steel square pipe of 17 x 1.7 mm to prevent implosion of the lyophilizer during dehydration phase. The system was designed based on the specific heat capacity of Pears, Tomatoes and Carrot with values of 3.62 kJ/kg C, 3.98 kJ/kg C and 3.79 k/kg C respectively. The results showed that dry-bulb temperature of 28°C at initial stage and 1°C after drying while the dew point temperature of 20.8°C at initial stage and -6.1°C after drying were recorded. The result obtained also shows that the temperatures (dry-bulb and dew point) and relative humidity of the lyophilized product is lower as compared to the imported ones. A total of 6hours was used for freeze drying with 1/10 reduction in weight of the lyophililized product when weighed.
Preliminary investigation of emission characteristics of shaving from three wood species utilized for furniture production in Ibadan, Oyo State
(International Commission of Agricultural and Biosystems Engineering, 2012) Adewole, N. A.; Oyewola, M. O.; Salau, T. A. O.; Bello, R. O.; Raji, T. O.
Carpentry workshop is among the prominent and active components of the Nigerian wood industrial sector. The activity in carpentry workshop inevitably generates different categories of wastes. Shavings is among the wood wastes generated in large quantity and the common means of disposing it in major town like Ibadan in Oyo State is by combusting. Large percentage often finds its way to household where it's often used to subsidize fuel for domestic cooking. However, this means of disposal may be prone to health hazard due to the emission released during its combustion. This work examines the combustion characteristics of three typical wood species that are commonly use for furniture production in Ibadan, Oyo state. The species were combusted in Bubbling Fluidized Bed (BFB) combustion under various operating conditions. The result shows that Carbon monoxide (CO) emission is pronounced in the combustion of all the wood species. In all the three cases, Milicia excelsa (Iroko) and Tectona grandis (Teak) have the lowest and highest CO emission respectively. It is suggested that if this waste must be used as fuel for domestic cooking, appropriate technology must be employed especially where low combustion temperature is desirable. However, proper disposition of this waste should be encouraged.