ABSTRACT The present invention relates to an improved control system for starting a three phase induction motor comprises improved power contactors configured to have a pair of three pole delta and main contactors, and a single pole star contactor for supplying AC power to star position and delta position, a timer for controlling AC power supply switching operation for star position and delta position and for adjusting a time delay of switching over from star connection to delta ...
Wireless networks are becoming part of everyday life. Wireless LANs, cell phone networks, and personal area networks are just a few examples of wireless networks widely used in our everyday lives. However, wireless devices are range and data rate limited.The research community has spent a great deal of effort on finding ways to overcome these limitations. One method is to use Multiple-Input Multiple-Output (MIMO) links. The multiple antennas allow MIMO systems to perform precoding (...
Ecosophy is an Ecological Philosophy aimed at a Philosophical study of the Ecological knowledge. This book is particularly an ethical assessment of the African environment as its setting is basically on the African environment.
Abstract Due to the toxic effects of chemical pesticide and other agro chemicals on human beings and livestock, residual toxicity, environmental problems, pest out-breaks and drastic effects on beneficial insects the use chemical pesticide and other agro chemicals are getting reduced /being banned globally. But Biopesticides that are extracted, for example, from neem seed can tackle these problems to make it more eco-friendly, economically viable and socially acceptable for the ...
ABSTRACTBamboo is one of the oldest traditional materials used by mankind. They are the largest members of the grass family and are the fastest growing in the world. Bamboo is a substitute building material which is renewable, environment friendly and widely available as the wood resources are diminishing and restrictions are imposed on the felling of the natural forest trees. Due to its rapid growth and high yield, adaptability to most climatic conditions and due to its properties, bamb...
ABSTRACTSoil is the ultimate foundation material which supports the structure. The proper functioning of the structure will, therefore, depend on the engineering properties of the underlying soil. The objectives of this research are to investigate the engineering properties of soils found in the site by conduction different types of laboratory tests. This research work is useful in providing necessary data or information that can be used in designing Civil Engineering structures in the site. ...
Design and construction of 36W automatic solar street light using Solar panel, charge controller, led and with batteryCHAPTER ONEINTRODUCTION1.1 Background InformationElectricity is a general term comprising of a variety of phenomena resulting from the presence and flow of electric charge. These include many phenomena, such as lightning, static electricity, and the flow of electrical current in a cable. In addition, electricity comprises less familiar concepts such as the electromagnetic fiel...
This project covers the design and construction of a power generating windmill. The designs was carried out based on long-term available wind data of bida at 10m above the ground level. The average wind speed for Bida is 5.24m/s and rated turbine wind speed is 6.29m/s. The design of each components of the system were carefully constructed in a well equipped workshop within the school premises. Calculations were done manually for each components of the system and the results was match with the...
This is a review of The HP HT wells in Niger Delta.
ABSTRACTFiber optic communication systems have revolutionized the telecommunications industry, because it is used for faster transmitting of telephone signals, internet communication and cable television signal due to such lower attenuation and interference. The optical fibers are buried deep in the ground (1.2-1.5 meters) away from human activities. However, these fibers are been cut on frequently, the minute a fiber is cut, there is a halt in the smooth transition of signal. ...
One of the widely debated topics in petroleum exploration in the management of its undesirable adverse effects on the environment. An accurate evaluation of the potential biophysical and socioeconomic impact will minimize the negative impacts of petroleum exploration and enhance the benefits thereof. Due to higher uncertainties associated with the potential presence of oil and gas in the Voltaian Basin, a 2-D seismic survey is carried out by Ghana National Petroleum Corporation (GNPC) to help...
Hydraulic fracturing plays a key role in the economic production of hydrocarbons from a reservoir by inducing permeable channels to improve the drainage area and to ease flow of oil and gas into the wellbore (Burton et al, 2002). A pressure transient test in Oredo O well, Oredo field located in Benin city, Nigeria, revealed a skin factor of +7.58 and flow efficiency of 0.53 (Kelechi et al, 2015). These are indications of a damaged well. PROSPER software (production system performance) has bee...
A model to predict the dry sliding wear behaviour of Aluminium-Jute bast ashparticulate composites produced by double stir-casting method was developed in termsof weight fraction of jute bast ash (JBA). Experiments were designed on the basis ofthe Design of Experiments (DOE) technique. A 2k factorial, where k is the number ofvariables, with central composite second-order rotatable design was used to improvethe reliability of results and to reduce the size of experimentation without loss ofacc...
TABLE OF CONTENTTITLE PAGE iDEDICATION iiACKNOWLEDGEMENT iiiTABLE OF CONTENT iv CHAPTER ONE1.1 GENERAL INTRODUCTION 11.2 CONSEQUENCES OF SLOPE FAILURES 1 CHAPTER TWO2. 0 DETERMINATION OF POTENTIAL FAILURE GEOMETRY 42.1.1 Plane Failure 42.1.2 Wedge failure 42.1.3 Step path failure 42.1.4. Raveling failure 52...