FEASIBILITY INDEX (FI) MODEL EVALUATION OF EVAPORATIVE COOLING POTENTIAL OF MUBI-SOUTH

Ibrahim, U.H¹. A.A. Baba² and Bello S. Momoh³

heldabuk@yahoo.com; adamuldam@yahoo.com; harunakalaa@yahoo.com

ABSTRACT

Thermal comfort has a great influence on the productivity and satisfaction of indoor building occupants. In some developing nations 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, 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.

Index Terms: Evaporative cooling, Thermal comfort, Temperature, Relative humidity, Feasibility index

SUITABILITY OF LOCUST BEANS WASTE ASH AS A REPLACEMENT FOR CEMENT IN CONCRETE 

Adejoh Benjamin Ochola¹, Abubakar Muhammed Ahmadu², Abubakar Sani Kazaure³

Department of Civil Engineering,

Kaduna Polytechnic, Kaduna

Email: adejoh_benjamin@yahoo.com

ABSTRACT

This study is aimed at investigating the compressive strength of concrete using locust beans waste ash (LBWA) as a replacement for cement in concrete using three grades of concrete; grade 20, 25 and 30 respectively, the concrete cube cast was; control (0%) 5%, 10% and 15% respectively. the cube was cast, cured and tested at 7days, 14days. 21days and 28days. Although, the results of this study have shown a significant reduction in compressive strength of concrete utilizing LBWA than normal concrete, it could be recommended that LBWA of 5% & 10% replacement can be used for the different grades of concrete, while 15% replacement of LBWA can be used in road kerbs, concrete blocks, non-bearing concrete walls, Light Weight Concrete, precast units (partition walls, concrete blocks for Architectural applications and some cases of slabs on soil, culverts, sidewalks, drive ways), foundation pads for machinery, etc.

Keywords: Cementious material, Compressive strength, Concrete, locust beans waste ash, Pozzolana

MATHEMATICAL IMPACT OF MALTHUSIAN POPULATION MODEL ON NIGERIAN GROWTH DOMESTIC PRODUCT

Zayyanu Umar & Yusuf Usman
Department of Computer Science, Waziri Umar Federal Polytechnic, Birnin Kebbi,
Department of Mathematics, Waziri Umar Federal Polytechnic, Birnin Kebbi,
Email: zayyanuumar1@yahoo.com, yusufusman1314@yahoo.com

ABSTRACT
The study investigates the mathematical impact of Malthusian population model on Nigerian Growth Domestic Product (GDP). Nigeria is a middle income, mixed economy and emerging market, with expanding financial, service, communications, technology and entertainment sectors. It is ranked as the 〖21〗^st largest economy in the world in terms of nominal GDP, and the 〖20〗^th largest in terms of Purchasing Power Parity. It is the largest economy in Africa; its re-emergent, though currently underperforming, manufacturing sector is the third-largest on the continent, and produces a large proportion of goods and services for the West African sub-region. The largely subsistence agricultural sector has not kept up with rapid population growth, and Nigeria, once a large net exporter of food, now imports a large quantity of its food products. An important idea regarding overpopulation as it relates to poverty is that presented by the Neo-Malthusian perspective. Thomas Malthus argued that overpopulation directly corresponds to human suffering due to the notion that human population increases geometrically while food production can only increase arithmetically. These trends, he argued, would result in a point at which a society experiences war, poverty, and famine as the need for food surpasses its availability. Malthus reasoned that the process of population growth would need to be checked by a decrease in fertility or an increase in mortality. The Neo-Malthusianism perspective is essentially the application of Malthus’ theories on current world systems in order to investigate trends and make predictions. The implications of a neo-Malthusian model are that the Earth can only sustain the agricultural needs of a limited population and that as overpopulation occurs, there are significant social and economic consequences. Neo-Malthusian perspective has also been extended beyond agricultural sustainability to describe the need and depletion of all resources. In conclusion, these interpretations suggest that overpopulation may in fact be a direct cause of poverty and starvation in societies around the world.

Keywords: Nigerian Economy, GDP, Malthusian Model and Over Population.

APPLICATION OF MULTIPLE REGRESSION MODELS TO ANTHROPOMETRIC DATA

 Bartholomew A. Uchendu

Department of Maths/Statistics,

Federal Polytechnic, Nekede, Owerri, nigeria

Email: uchendubartholomew@yahoo.com