FACULTY OF SCIENCE
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Item A VECTOR MATRIX APPROACH OF COUNTING CYCLIC QUOTIENTS OF SOME ABELIAN P-GROUPS(2009) Enioluwafe, M.We determine in this paper, the precise number of cyclic quotients of Abelian p-groups of exponent p i and rank r > 1, i = 1, 2, . . . , n for all natural numbers nItem Strengthening academic linkages and collaboration in universities(Graduate School, University of Calabar, 2004-07) Olayinka, A.Item Policy thrust and new direction of postgraduate programme in the University of Ibadan(2002-02) Fagbemi, B. O.; Olayinka, A.; Popoola, L.Item Application of resistivity soundings for borehole siting in crystalline basement areas of Southwestern Nigeria(International Commission for Earth Sciences in Africa, 1998) Olayinka, A. I.This paper establishes the reasons why the resistivity sounding technique is the preferred geophysical tool in borehole siting in crystalline basement areas of southwestern Nigeria. It also identifies ways in which its use could be optimized. Factors for the widespread use of the technique include its relative cheapness, accuracy of depth determination, suitability in differentiating between the overburden and the fresh bedrock, speed of survey, popularity (and acceptability), and availability oi equipment. Due to the Superposition of lateral variations in resistivity on sounding data, some 62% of the sounding curves from the study area are characterized by a terminal branch rising at an angle exceeding 45°. In all the sounding data presented the terminal branch of the curve Starts rising at Wenner electrode spacing of less than or equal to 32 m. It is recommended that the maximum electrode spacing (AB/2 or a) should not be more than 150 m. Moreover, due to the irregular nature of the bedrock topography the Separation between adjacent sounding centres should not exceed 100 m, thus permitting an adequate sampling of the subsurface. This approach might prove helpful in other basement areas.Item G-Theory of Group Rings for Groups of ElementsAbelian p-Groups(Department of Mathematics, University of Ibadan, 2009) EniOluwafe M.The formula for the G— theory of the group ring of a finite group G given by H. co. Lenstra is shown to be valid for groups of elementary abelian P— groups. Keywords: Group rings , G— theoryItem Vectorial Mechanics(Distance Learning Centre, University of Ibadan, 2008) EniOluwafe M.Vectors in space are the three-dimensional analog of vectors in the plane and are sub ject to the same rules of addition, subtraction, and scalar multiplication that govern vectors in the plane. We shall discuss length or magnitude and direction of vectors.Item Algebra 1(Distance Learning Centre, University of Ibadan, 2008) EniOluwafe M.We shall expose the meaning of a set and state the different ways of naming a set. We shall also reveal the different types of sets, subsets, equality of sets and the universe of discourse. We shall then interact various sets which belong to the same universe, using the definitions of union, intersection, power set, complements, relative complements and symmetric difference to form new sets. Geometry representation of sets shall be presented in the form of Venn diagrams which will then be used in solving problems on sets. We also study some similarities of algebra of numbers to algebra of set theory and give a theorem on the number of elements in setsItem Temperature variations and soil thermal properties at the Nigeria mesoscale experiment site, Ibadan, Nigeria(ECRTD-UK, 2019) Nwaokoro, E.; Nymphas, E. F.Soil temperature has been observed to depend on a number of factors, which also determine the surface temperature. In this study, soil temperature at the Nigeria Mesoscale Experiment (NIMEX) site, Ibadan (7.4398° N, 3.8930° E) was investigated and the soil thermal properties were estimated for the period of March, 2006 to January, 2007 using Kersten model. The rainy seasons had increased the soil moisture content and soil thermal properties while the dry seasons had low soil moisture content and soil thermal properties. The maximum temperature of 32.10° C at the 30cm depth was measured in November 2006 during the dry season and the minimum temperature 26.80° C was measured at 5cm depth in September 2016 during the wet/rainy season. Soil moisture, thermal conductivity, thermal diffusivity and volumetric heat capacity had their maximum value of 20.52m3m-3, 1.006 Wm-1K-1, 1.07*10-8m2s-1 and 0.91*108Jm- 3K-1 in September 2006 respectively. The minimum values for soil moisture, thermal conductivity and volumetric heat capacity occurred in January, 2007 with values of 15.75 m3m-3, 0.90 Wm-1K-1 and 0.91*108Jm-3K-1 respectively, and the minimum value of 0.85*10-8m2s-1 for thermal diffusivity occurred in July 2006.Item Simulating the influence of greenhouse gases on the climate of West Africa(2019) Adeniyi, M.O.; Nymphas, E.F.; Oladiran, E.O.The response of climate to perturbations in GHGs is location dependent. Six experiments: control (CTRL); double CH4; double CO2; double N2O; halved CFC11 and halved CFC12 were carried out to reveal the local area response to different GHGs levels in the atmosphere over West Africa. Double CH4, CO2 and N2O generally induce wetness but they also induce localized dryness at the hilly and mountainous areas of SW Ghana, Central Nigeria, Northern Cameroon and South-eastern Central African Republic. Increase in ground temperature is induced by double GHGs with intensified warming at the north by double CO2. However, patches of cooling are induced at the north. Changes in specific humidity induced by double CO2, CH4 and N2O are similar. Intensified tropical easterly jet is induced by double GHGs. A dipole anomaly of wind with positive at the lower latitude and negative at higher latitude is induced at the northern part of West Africa. Significant reduction in cloud water content is induced from 900 to 400 hPa and 0 and 15oN.Item Meteorological comfort indices to assess extreme warmness in southwest, Nigeria(2019) Aluko, T.O; Nymphas, E.F.; Bolaji, O.A.; Odubanjo, O.F.2015, 2016 and 2017 have been confirmed the three warmest years on record and the degree of warming during these three years has been exceptional. Extremes of heat and cold environmental conditions have been known to be very detrimental to the health and comfort of humans. The severity of these adverse effects is often local and varies from one place to another though they are happening on a global scale therefore Temperature variation, Heat Index (HI) temperature and Dew Point Temperature (DPT) ( Meteorological comfort indices) were used to assess the effect of this condition in southwest, Nigeria. Air temperature and Humidity data were collected from meteorological stations situated in the southwestern states selected for study and was processed using the rule of Thumb for DPT calculations as expressed by Lawrence (2005) and Steadman (1979) formula simplified by Rothfusz’ model (1990) for HI temperature. The data analysis was done using Microsoft Excel Package and Statistical Package for the Social Sciences (SPSS), the following results were obtained: Elevation may affect temperature yet during extreme warmness other factors can have a greater influence on temperature and meteorological comfort indices used to assess extreme warmness in southwest Nigeria from this study showed greater impacts thus: Heat Index Temperature has highest values in Lagos State, while Dew Point Temperature have highest values in Ogun state. None of these extreme warmness measuring variables seem to be solely in favour of state Location in terms of coordinates and elevation; this suggests more anthropogenic influence forming the characteristics of the states to geographic locations of the states however, between the start year of extreme warmness (2015) and 2017, HI temperature showed a significant increase while average DPT did not really change during the period of extreme warmness.