November 2010
Reliability assessment of 3-phase three winding converter transformer of HVDC transmission system
High voltage direct current (HVDC) is today recognized as an effective and efficient means of transmitting bulk power over long distances through over head lines or cables. The reliability of HVDC links have always been of primary concern in planning and operating of power systems. The existence of spares and maintenance practices do affect the availability of HVDC stations. The HVDC converter transformer...
November 2010
Determination of weathered and fractured zones in part of the basement complex of North-Eastern Nigeria
Two electromagnetic (EM) traverses and seven schlumberger vertical electrical soundings (VES) were carried out using “APEX MAXMIN” EM machine equipped with a transmitter and a receiver and a “GEOPULSE” resistivity meter to study formation strata that could host groundwater within the overburden and fracture/fault zones of the basement complex along Gwoza-Damboa road in Borno...
November 2010
Two and three electrostatic lens systems for focusing of charged particles
Design of the focusing lens system has been done by using SIMION computer program which is used to trace and simulate the ion beam during its transport. A parallel beam of singly charged nitrogen ions of diameter 2 mm with energy of 3 keV was started at a distance of 50 mm before entering the lens system. In order to design the system, we studied it with different parameters in the presence of space charge....
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