Browsing by Author "Nymphas E.F."

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Characteristics of worst hour rainfall rate for radio wave propagation modelling in Nigeria
(springer, 2019) Osita I.; Nymphas E.F.
Radio waves especially at the millimeter-wave band are known to be attenuated by rain. Radio engineers and designers need to be able to predict the time of the day when radio signal will be attenuated so as to provide measures to mitigate this effect. This is achieved by characterizing the rainfall intensity for a particular region of interest into worst month and worst hour of the day. This paper characterized rainfall in Nigeria into worst year, worst month, and worst hour. It is shown that for the period of study, 2008 and 2009 are the worst years, while September is the most frequent worst month in most of the stations. The evening time (LT) is the worst hours of the day in virtually all the stations.
On the environmental effects on a point discharger
(2011) Nymphas E.F.; Oladiran E. O.
The environmental effect on a point discharger has been investigated. It was found that the magnitude of point-discharge current (Ip) measured from a discharger is strongly affected by the presence of other dischargers, particularly when they are very close to the discharger through which Ip is measured. The starting potential depends on the tip clearance of the central discharger rather than the separation of the points. At higher tip clearances the compound discharger exhibits a stepped-leader like process. Atmospheric contaminants also affect the magnitude of Ip.