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Search Results: 1 - 10 of 582036 matches for " A.D. Asiegbu "
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Design of a Model 150 MWh Wind Generator for Domestic and Industrial Applications in Umudike, South East Nigeria
A.D. Asiegbu,P.L. Aigba
Journal of Engineering and Applied Sciences , 2012,
Abstract: A model wind-generator design (UWM-1) structured for use in the Umudike community has been done. Design was based mainly on data from wind studies within the community. With two blade-propellers operating from a hub height of 67m, power in excess of 150MWh per annum is derivable which can be utilized in various forms to support domestic and industrial activities of the community.
Studies of Wind Resources in Umudike, South East Nigeria-An Assessment of Economic Viability
A.D. Asiegbu,G.S. Iwuoha
Journal of Engineering and Applied Sciences , 2012,
Abstract: Studies of the wind resources in Umudike community have been done over a ten-year period (1994-2003) as an assessment of economic viability. Analysis based on IEC wind speed correction report shows that the wind present in the community is economically viable from a hub height of 67m and above. From this height the wind can deliver to a wind turbine an average annual speed of 5.36 ms 1 (12 mph) and more study is both revealing informative.
Hydrological Growth Season (HGS) for Umudike Agro-Belt of Southeastern Nigeria
G.U. Chukwu,C. Oriaku,A.H. Omar,K.C. Emeasor,A.D. Asiegbu
Online Journal of Earth Sciences , 2012,
Abstract: Daily rainfall data collected for thirty-two years (1972-2004) were used to develop a Hydrological Growth Season (HGS) for agricultural purposes in Umudike agro-belt. Umudike is an internationally accredited agricultural community in the southeastern part of Nigeria. To maintain or boost the tempo of food production and security within this agrarian zone, an HGS has been constructed using agro-meteorological data. The raw data of daily rainfall were processed into pentades which was thereafter used to obtain an ogive graph. Deductions from the graph show that certain crops like maize Zeamays, okra Abelmoschus esculentus (L.) Moench, egg-plant Solanum gilo etc can be planted up to three times in a year and not the ordinary traditional once per year practice. Also, some other crops such as cassava Manihot esculenta Crantz can be cultivated twice within the year. All these measures are geared towards achieving food security in our time which is one of the nation`s empowerment strategies.
An Analysis of Jigbe as a Traditional Dramatic Performance
A.D. Menegbe
Pakistan Journal of Social Sciences , 2012, DOI: 10.3923/pjssci.2011.27.31
Abstract: Discussions have been on for along time over the issue of the existence of drama in traditional African society. Two schools of thought have crystallized. The evolutionist school maintains that there is nothing in traditional African society to be classified as drama. The relativist school postulates that drama strives abundantly in traditional African society. This study attempts an analysis of jigbe traditional drama as one of the many traditional dramatic performance in African it is observed that it could serve as one of the various source materials for modern African drama we recommend that it should be documented for the purpose of preserving it present form. We further suggest the performance be patronized for its survival.
A.D. Kahlen
South African Journal of Industrial Engineering , 2012,
Abstract: ENGLISH ABSTRACT: Opportunities to improve production processes and access to markets through the implementation of lean manufacturing in biomedical manufacturing are presented. The importance of a unified definition of manufacturing, to which biomedical manufacturing is party, is emphasized, and the theory of “lean”, summarized as “purpose, process, people”, is elaborated. The requirements for the creation of value through the creation of flow and the elimination of wastes are highlighted in the context of biomedical manufacturing. Finally, case studies are presented to illustrate the approaches to “purpose, process, people”. AFRIKAANSE OPSOMMING: Geleenthede vir die verbetering van produksieprosesse en marktoegang via die implementering van skraalvervaardiging in die biomediese vervaardigingsbedryf word voorgehou. Aandag word geskenk aan die betekenis van terme soos “skraal, doel, proses, menes” in die konteks van biomediese vervaardiging. Waardeskepping, vloei en vermorsing word onder die loep geneem. Gevallestudies word ter illustrasie van begrippe aangebied.
The time of groundwater free surface lowering before foundation pit construction
A.D. Girgidov
Magazine of Civil Engineering , 2012,
Abstract: On the basis of plane free surface gravitations groundwater flow model and some assumptions similar to ones employing in infiltration and quasistationary problems the time of the necessary lowering of free surface before the building of pit is considered. For the lowering the group of wells along the pit perimeter is used. The wells are located so close to each other that formation a filtration flow by them is equivalent to dewatering by using a narrow vertical slit along the perimeter of the excavation.The time is calculated on the basis of condition that at the beginning of construction the level of ground water within the excavation must be below the design elevation of excavation bottom, and outside it smoothly changing water flow to the slit must be formed.The formulas for the time of lowering from initial natural level before building of pit to finite level equal to the bottom of pit are obtained. The example of calculation is discussed.
Energy dissipation in circular tube
A.D. Girgidov
Magazine of Civil Engineering , 2012,
Abstract: Energy dissipation distribution along the circular tube radius is important in solving such problems as calculation of heat transfer by the air flow through building envelope; calculation of pressure loss in spiral flows; calculation of cyclones with axial and tangential supply of dust-containing gas.Two types of one-dimensional radially axisymmetric flows in circular tube were considered: axial flow and rotation about the axis (Rankine vortex). Relying on two- and four-layer description of axial turbulent flow energy dissipation was calculated in each layer.Similar calculation for Rankine vortex with viscous sublayer at the tube surface was provided. By employing the dissipation minimum principle the boundary radius between rigid rotation and free vortex is calculated. Approximation of the velocity distribution in Rankine vortex is proposed.
Changing of energy dissipation in the transition of laminar flow to turbulence (rus)
Girgidov A.D.
Magazine of Civil Engineering , 2011,
Abstract: Under the same fixed dynamical boundary conditions the energy dissipation in laminar and turbulent flow are compared. As examples the flow past a plate and the flow through a pipe are considered. It is found out that in turbulent flow energy dissipation is essentially less than in laminar flow (under the same boundary dynamical conditions).
About the frontal resistance to motion of the cylinder
A.D. Girgidov
Magazine of Civil Engineering , 2011,
Abstract: According to conventional diagram of the flow past cylinder, dissipated power in the part of potential flow, formed by windward side of cylinder is calculated. Comparison of this power with the power, required to overcome the resistance to motion of the cylinder, shows that thin boundary layer in windward side of cylinder forms under Reynolds numbers exceeded 100.
Chironomids: From Genes to Ecosystems/Edited by Peter Cranston
A.D. Harrison
African Zoology , 2011,
Abstract: This book comprises 46 papers delivered at the 12th International Chironomid Symposium in Canberra, Australia, January 1994. Delegates attended from all continents, except Africa, and their papers give an excellent idea of the research being carried out on this important group of aquatic insects.
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