Showing papers by "University of Nigeria, Nsukka published in 1972"
TL;DR: In this paper, a reconstruction of the tectonic history of part of the Benue Trough is made from a study of the marine transgressions and regressions in SE Nigeria.
Abstract: A reconstruction of the tectonic history of part of the Benue Trough is made from a study of the marine transgressions and regressions in SE Nigeria. Two periods of deformation involving essentially the interaction of continental plates are suggested. The oceanic crust produced by crustal attenuation in the Benue rift is very minimal. Unstable tectonic conditions in the Benue Trough may have created conditions for the development of an evaporite sequence.
274 citations
TL;DR: In this article, the spatial, diurnal and seasonal distribution of the modulation of a particular type of Sq(H) in the equatorial regions is examined, which appears most clearly as an abnormal depression in the afternoon hours, sometimes resulting in the reduction of the H component well below its nighttime values.
Abstract: The spatial, diurnal and seasonal distribution of the modulation of a particular type of Sq(H) in the equatorial regions is examined. It appears most clearly as an abnormal depression of Sq(H) in the afternoon hours, sometimes resulting in the reduction of the H component well below its nighttime values. These abnormal depressions of Sq(H) occur at about the same local time in a very narrow zone (at least ±4° dip latitude) flanking the dip equator. They occur more frequently from noon to dusk in the months around the December solstice. General considerations of their characteristics are consistent with some associations with the lunar tide. However, detailed comparison of the time of maximum depression with the time of minimum geomagnetic lunar tide is not consistent with its association with the lunar tide. Some evidence from f0F2 suggests that the depressions arise from modulation or reversal of the electric field at the equatorial electrojet regions of the ionosphere.
36 citations
TL;DR: An outbreak of paragonimiasis (lungfluke disease) detected after the Nigerian civil war (1967-70) is reported from Eastern Nigeria, where an increase in crab consumption occurred during the civil war and post-war period as a result of severe shortage of protein from other sources.
31 citations
TL;DR: In this article, the response to K by potted millet (Pennisetum spp.) and sorghum (S. vulgare) was determined in soils taken from nine soil groups in twenty locations in Eastern Nigeria and correlated with K extracted with five laboratory methods.
13 citations
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2 citations
TL;DR: The contribution of high-frequency zeros to the glottal-vocal-tract spectrum can be represented in the z plane by a negative real-axis zero of high multiplicity as discussed by the authors.
Abstract: The contribution of high-frequency zeros to the glottal-vocal-tract spectrum can be represented in the z plane by a negative-real-axis zero of high multiplicity. Analytically derived results for the location and order of the compensating zero are in agreement with those obtained by a numerical curve-fitting procedure using a digital computer.