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Accra, Ghana

The Accra Polytechnic is a public tertiary institution and the Premier Polytechnic in the Greater Accra Region of Ghana. Wikipedia.


Urban farming, practiced by about 800 million people globally, has contributed significantly to food security and food safety. The practice has sustained livelihood of the urban and peri-urban low income dwellers in developing countries for many years. Its popularity among the urban low income is largely due to lack of formal jobs and as a means of adding up to household income. There is increasing need to sustainably manage urban farming in developing nations in recent times. Population increase due to rural-urban migration and natural, coupled with infrastructure developments are competing with urban farming for available space and scarce resources such as water for irrigation. Lack of reliable data on the extent of urban/peri-urban areas being used for farming has affected developing sustainable policies to manage urban farming in Accra. Using ground based survey methods to map the urban farmlands are inherently problematic and prohibitively expensive. This has influenced accurate assessment of the future role of urban farming in enhancing food security. Remote sensing, however, allows areas being used as urban farmlands to be rapidly established at relatively low cost. This paper will review advances in the use of remote sensing technology to develop an integrated monitoring technique for urban farmlands in Accra. © 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. Source


Addo-Yobo F.O.,Accra Polytechnic | Pitt M.J.,University of Sheffield | Obiri H.A.,The Institute of Industrial Research
AIChE Journal | Year: 2011

A study of the effects of particles on the manner in which sheets of aqueous suspensions wetted particles disintegrate during atomization by hydraulic pressure nozzle showed that the sheet stability is reduced by particles in the region where the particle size is greater than the sheet thickness due to localized thinning of the sheet due to curvature variations caused by particles moving apart in this region. At high-volume fraction of solids, the sheets perforate. It is inferred from the mechanism that the critical volume fraction of solids at the onset of perforation decreases with decreasing particle size, decreasing density and surface tension, and increasing viscosity of the medium. A critical perforation number, A c, is inferred from the above mechanism. Waves are observed on the sheet at positions closer to the nozzle which would be absent on aqueous sheets similarly produced but free of particles. © 2010 American Institute of Chemical Engineers (AIChE). Source


Sanful R.E.,Cape Coast Polytechnic | Darko S.,Accra Polytechnic
Pakistan Journal of Nutrition | Year: 2010

The proximate and sensory analysis of the soy-supplemented wheat flour bread has been made. This was done to investigate the nutritional value and the general acceptability of the soy-supplemented bread. The proximate analysis indicate that the moisture content, ash and the protein increase with increasing soya bean flour concentration. The increase in protein concentration indicates that supplementation of wheat flour with soyabean flour would greatly improve the protein nutritional quantity of bread. It is observed from the organoleptic analysis that generally, whole wheat bread and soy- supplemented bread with soybean flour below 30% is preferred to bread with soybean flour beyond 30%. ©Asian Network for Scientific Information, 2010. Source


Sanful R.E.,Cape Coast Polytechnic | Darko S.,Accra Polytechnic
Pakistan Journal of Nutrition | Year: 2010

The proximate and sensory analysis of the cassava-cocoyam supplemented wheat flour rock cake has been made. This was done to investigate the nutritional value and the general acceptability of the cassava flour and cocoyam flour supplemented rock cake. The proximate analysis indicate that the moisture content, ash and the carbohydrate increase with increasing cassava and cocoyam flour concentration. Generally the ash content of composite rock cakes increases as the level of supplementation increases implying that the inorganic nutrients in the composite rock cake is richer than that of wheat rock cake. It is observed from the organoleptic analysis that generally, whole wheat rock cake and cassava and cocoyam supplemented rock cake with cassava and cocoyam flour up to 30% is preferred to rock cake with cassava and cocoyam flour beyond 30%. Thus cassava and cocoyam flour can be used to substitute for wheat flour up to about 30%. ©Asian Network for Scientific Information, 2010. Source


Acakpovi A.,Accra Polytechnic | Xavier F.F.,University Abomey Calavi | Awuah-Baffour R.,University of Ghana
Proceedings of the 2012 IEEE 4th International Conference on Adaptive Science and Technology, ICAST 2012 | Year: 2012

Photovoltaic Water Pumping System (PWPS) is a well known technology deployed in remote areas for the provision of drinking water and also for irrigation. Due to the high cost of solar energy implementation, the system becomes very costly. Unfortunately, innaccuracies in the system sizing mostly lead to oversizing, resulting in huge waste of money. This paper presents a mathematical method of sizing photovoltaic water pumping systems with more accuracy. The method starts with the assessment of losses through pipes and other accessories by using Poiseuil, Blasius and Blench laws. It also considers data on solar irradiation, average temperature as well as necessary parameters on the solar panel itself. It helps to calculate accurately the peak power that must be generated according to a demand. Moreover, simulations have been done in MATLAB to emphasize the effect of neglecting the temperature, the solar irradiation and the pipeline losses on the sizing method. Results show that big variations of temperature influence the sizing negatively, requiring more power than necessary; Bigger Solar irradiation requires fewer peak power. Again, hydraulic losses could add up to 10% of the necessary peak power. © 2012 IEEE. Source

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