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Seasonal ARIMA Modeling and Forecasting of Rainfall in Warri Town, Nigeria  [PDF]
Daniel Eni, Fola J. Adeyeye
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.36015

We obtained historical data of rainfall in Warri Town for the period 2003-2012 for the purpose of model identification and those of 2013 for forecast validation of the identified model. Model identification was by visual inspection of both the sample ACF and sample PACF to postulate many possible models and then use the model selection criterion of Residual Sum of Square (RSS), Akaike’s Information Criterion (AIC) complemented by the Schwartz’s Bayesian Criterion (SBC), to choose the best model. The chosen model was the Seasonal ARIMA (1, 1, 1) (0, 1, 1) process which met the criterion of model parsimony with RSS value of 81.098,773, AIC value of 281.312,35 and SBC value of 289.330,84. Model adequacy checks showed that the model was appropriate. We used the model to forecast rainfall for 2013 and the result compared very well with the observed empirical data for 2013.

Comparability of the amino acid composition of aril and seed of blighia sapida fruit
EI Adeyeye
African Journal of Food, Agriculture, Nutrition and Development , 2011,
Abstract: Akee apple fruit (Blighia sapida Konig), is one of the popular small-scale tropical fruits and it is an important crop. B. sapida may be eaten raw (without the pink raphe attaching the aril to the seed) or after cooking when it resembles scrambled eggs. Fruits like the akee apple are novelties for many people except in the savannah belt; in the localities where they grow they are eaten and relished. In view of this, an investigation into the concentrations of amino acids of the aril and seed parts of Blighia sapida fruit was carried out using standard methods to determine amino acid profiles; quality of dietary protein was determined using various methods like: amino acid scores determination [(in three different ways); (i) amino acid score based on the whole hen’s egg, (ii) essential amino acid score based on the provisional amino acid scoring pattern, (iii) essential amino acid score based on suggested school child requirement] essential amino acid index and predicted protein efficiency ratio. For quick precipitation of protein, the isoelectric point was also determined. Glutamic acid was the most abundant amino acid (11.4-12.7 g/100 g) and while Arg was the most abundant (7.25 g/100 g) essential amino acid in the aril, it was Leu (6.58 g/100 g) in the seed. The total essential amino acid in aril was 33.7 g/100 g (50.2 %). It was 33.8 g/100 g (45.8 %) in the seed. The limiting essential amino acid (based on provisional scoring pattern) was Met + Cys (0.60) in aril and Thr (0.59) in seed. The essential amino acid index ranged from 1.08 (seed) to 1.62 (aril); the predicted protein efficiency ratio was 1.83 in aril and 2.20 in the seed whereas the isoelectric point ranged between 3.89 in aril and 4.0 in the seed. At á 0.05, significant differences existed in the samples in amino acid profiles and calculated isoelectric point (pI). The results of this study indicated that the amino acid profiles of akee apple aril and seed are similar in composition, being good sources of many of the essential amino acids. Whilst the aril is eaten fresh, the seed can be exploited for human food.
Comparative study on the characteristics of egg shells of some bird species
EI Adeyeye
Bulletin of the Chemical Society of Ethiopia , 2009,
Abstract: Egg shells of francolin, duck and turkey were compared for their physical and chemical characteristics. The range of weight of eggs and shells, respectively, were 25.2-74.9 and 5.23-9.40 g. Protein content was between 65.2-73.1 g/100 g; crude fat ranged from 2.54-8.54 g/100 g; crude fibre was low with value range of 0.04-1.14 g/100 g; ash content range was 3.44-7.56 g/100 g. Total and essential amino acids, respectively, were between 189-353 and 98.1-188 mg/g and threonine was limiting. Gross energy ranged from 1556-1687 kJ/100 g. High concentrations of minerals were detected.
EI Adeyeye
Bulletin of the Chemical Society of Ethiopia , 2005,
Abstract: Levels of sodium, potassium, calcium and magnesium were determined in plant organs (bud, flowers, fruit, seed, leaves, stems, roots, cobs, styles, shaft, grains and efflorescences) of three Fadama farms located in Ifaki-Ekiti, Ado-Ekiti and Ikere-Ekiti of Ekiti State, Nigeria. The highest levels of Mg, K, Na and Ca were obtained in the bud of Hibiscus esculentus with respective values (ppm dry weight, ppm DW) of 4397, 2983, 3928 and 1622; this was closely followed by their levels in Lycopersicon esculentum root: Mg (2734), K (1079), Na (2111) and Ca (678). The levels of all the elements were highly varied in the anatomical parts of each plant and between the various plants. The index of bioaccumulation (ratio in plants/soil) was recorded for all the elements with all values falling within 1-101 showing that the degree of accumulation was intensive. The overall levels of the elements were Mg > Na > K > Ca. KEY WORDS: Fadama crop parts, Major elements, Concentration ranking, Intensive bioaccumulation Bull. Chem. Soc. Ethiop. 2005, 19(2), 175-183.
The intercorrelation of the amino acid quality between raw, steeped and germinated guinea corn (Sorghum bicolor) grains
E.I. Adeyeye
Bulletin of the Chemical Society of Ethiopia , 2008,
Abstract: Levels of amino acids were determined in the grains of guinea corn, Sorghum bicolor (L.) Moench. The steeped sample was best in His, Arg, Thr, Ser, Pro, Gly, Ala, Met, Cys, Val, Phe and Tyr contents whereas germinated sample was best in Lys, Asp, Glu, Leu and Ile. The total amino acid contents were: steeped [57.71 g/100 g crude protein (c.p.)], germinated (53.37 g/100 g c.p.) and raw (37.91 g/100 g c.p.) with respective essential amino acids of 30.70 g/100 g c.p., 28.33 g/100 g c.p. and 21.48 g/100 g c.p. Percentage cystine/total sulfur amino acid (% Cys/TSAA) trend was 72.0 (steeped) > 71.1 (germinated) > 58.9 (raw). The Predicted Protein Efficiency Ratio (P-PER) levels were 0.23 steeped, 0.29 (germinated) and none (raw). The Leu/Ile ratio was 0.42 for steeped, 0.38 for germinated and 0.24 for raw grains. The limiting amino acid was Leu for all the samples with 0.30 (steeped), 0.31 (germinated) and 0.16 (raw). The two treatments enhanced the quality of the guinea corn amino acid levels. However, no significant differences occurred between raw/steeped, raw/germinated and steeped/germinated samples at p <0.05. KEY WORDS: Amino acid quality, Raw, Steeped, Germinated, Guinea corn Bull. Chem. Soc. Ethiop. 2008, 22(1), 11-17.
E. I. Adeyeye
Bulletin of the Chemical Society of Ethiopia , 2005,
Abstract: Levels of zinc, manganese, cobalt, selenium, copper, molybdenum, chromium, iron, aluminium, lead and cadmium were determined in plant organs (buds, flowers, fruits, seeds, leaves, stems, roots, cobs, styles, shaft, grains and efflorescences) and underlying soils of three Fadama farms located in Ifaki-Ekiti, Ado-Ekiti and Ikere-Ekiti of Ekiti State, Nigeria at 0–15 cm topsoil level. The pH levels were alkaline (7.0±0.3 – 8.1±0.7) while the soil texture ranged between loamy sand and sandy loam. There was similarity in Zn trend as was observed in Mn, Fe and Cu but they were of lower levels than Zn. Only Zn and Fe were mostly concentrated in the plant organs with Mn in very few plants. The index of bioaccumulation (ratio in plant/soil) were recorded for only Zn and Fe with the degree of accumulation ranging from medium to intensive (0.87–1.34) in Fe but only intensive (1.41–4.42) in Zn. KEY WORDS: Trace metals, Soils, Plant organs, Bioaccumulation Bull. Chem. Soc. Ethiop. 2005, 19(1), 23-34.
An Evaluation of Human Resource Management (HRM) Practices in Nigerian Universities: The Impact of Size
Adeyeye J. Olufemi
The Social Sciences , 2013,
Abstract: This study examines empirically, the relationship between size of the organization and Human Resource Management (HRM) practices that have been shown to contribute to organizational performance. The study draws on the resource-based view of the firm and hypothesized that big universities, operationalized as having >1000 academic and administrative staff can be differentiated from small Universities, defined as employing <1000 academic and administrative staff in their use of human resource management practices. Contrary to prior research findings, it was found that size did not correlate with the usage of HRM best practices. Both big and small universities used similar and identical HRM practices. Apparently, size did not differentiate between HRM practices employed in Nigeria Universities.
Human Capital Development Practices and Organizational Effectiveness: A Focus on the Contemporary Nigerian Banking Industry
Adeyeye J. Olufemi
Pakistan Journal of Social Sciences , 2012,
Abstract: The main purpose of this study is to gain a better understanding of the theoretical and empirical relationship between Human Capital Development (HCD) practices and some dimensions of Organizational Effectiveness of Nigerian Banks particularly after the banking sector reforms of June 2004. Data were generated by means of two sets of questionnaire administered to some selected Banks in Lagos, Nigeria. The study generated responses from ten Banks. Responses from the survey were statistically analyzed using descriptive statistics and pearson product movement correlation. The result of the study indicates that Nigerian banks are actively involved in HCD practices. The study shows that organizational effectiveness of the selected and participating banks is to a large extent satisfactory. Obviously, involvements in HCD practices are found to correlate positively with organizational effectiveness. The implications of this study include the need to encourage Nigerian banks and indeed all organizations willing to operate effectively and efficiently in the contemporary Nigerian business arena, to devote a substantial amount of their resources on the development of human element.
Managing Organizational Change in Nigeria Manufacturing Enterprises: Lessons from the Unilever Nigeria Plc
Adeyeye J. Olufemi
International Business Management , 2012,
Abstract: The study examines the level of acceptance of organizational change among workers and identifies factors that may impede the effective implementation of change among the manufacturing companies in Nigeria engaging the unilever Nigeria Plc as a case study. Utilizing data collected from a randomly selected sample of 720 senior/management staff and junior/non-managerial staff, regression analysis was performed to identify the determinants of acceptance of change among employees at the Unilever Nigeria Plc, Lagos, Nigeria. The results show some levels of employee acceptance of innovations and reveal that of the two categories of employees analyzed, non-managerial staff were more amenable to change. This study suggests that a more participative approach to the management of change process must be put in place to guarantee the acceptance of change in the manufacturing organizations in Nigeria.
Optimisation of weld-metal chemical composition from welding- flux ingredients: A non-pre-emptive goal programming approach
Ademola D. Adeyeye
Maejo International Journal of Science and Technology , 2010,
Abstract: A non-pre-emptive goal programming (NGP) model for weld-metal chemical composition optimisation from welding-flux ingredients is proposed. The proposed model, which is the first multi-objective mathematical programming approach to welding-flux formulation, provides increased flexibility to the welding-flux formulator in several ways: (1) several conflicting objectives can be simultaneously considered, (2) the best compromise for welding-flux formulation can be achieved with minimal expenditure of resources and experimental efforts, (3) the welding-flux designer can explore various trade-off options, and (4) the lead time and cost of developing welding consumables can be drastically reduced. This paper has extended the work of Kanjilal and co-investigators by coupling it with the NGP optimisation technique so as to prescribe the welding-flux ingredient levels that will achieve optimum performance for the flux at minimum experimental efforts and cost. The feasibility and suitability of the model is illustrated with data from the literature.
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