Wukari, Nigeria

Federal University, Wukari

Wukari, Nigeria
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Oladoja N.A.,Adekunle Ajasin University | Adelagun R.O.A.,Federal University, Wukari | Ahmad A.L.,Universiti Sains Malaysia | Ololade I.A.,Adekunle Ajasin University
Process Safety and Environmental Protection | Year: 2017

A green biogenic resource, Gastropod shell (GS), was used as the reactive material in a column reactor to develop a double pronged approach for the management of aquaculture wastewater (AQW). The GS was used to capture and recover phosphorus (P) from AQW, for reuse as fertilizer cum soil conditioner, and for the remediation of AQW for safe discharge. The kinetics and equilibrium isotherm parameters of the P-recovery process were derived in a batch process and the time-concentration profiles of the P-recovery process and the ability of the process to remediate AQW were evaluated in a column reactor, over a period of 30 day. The batch kinetic analysis showed that the P recovery occurred via mechanism controlled by either chemisorption or ion exchange. Significant amount of the total P loaded (Pin = 50.71 g) into the column reactor was captured (Pads = 37.18 g) in the GS matrix. The values of the P-sorption-yield (P% = 73.32%) and the maximum-P-uptake (qmax = 185.9 mg/g), obtained from the column reactor, showed that the capacity of the GS for P was high and the capacity was not exhausted at the end of the 30 days. The values of the thermodynamic driving force (ΔG (kJ/mol) < 0) showed that the precipitation of phosphate, as calcium mineral, contributed to the P-recovery process. Despite the deposition of extraneous matters, as confirmed by the SEM, on the GS, the non-appearance of diagnostic peaks in the X-ray diffractogram of the spent GS showed that amorphous calcium phosphate mineral was formed on the GS. © 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Gorai P.,Indian Center for Space Physics | Das A.,Indian Center for Space Physics | Das A.,Ramakrishna Mission Residential College | Sivaraman B.,Physical Research Laboratory | And 4 more authors.
Astrophysical Journal | Year: 2017

It has been pointed out by various astronomers that a very interesting relationship exists between interstellar alcohols and the corresponding thiols (sulfur analog of alcohols) as far as the spectroscopic properties and chemical abundances are concerned. Monohydric alcohols such as methanol and ethanol are widely observed and 1-propanol was recently claimed to have been seen in Orion KL. Among the monohydric thiols, methanethiol (chemical analog of methanol) has been firmly detected in Orion KL and Sgr B2(N2) and ethanethiol (chemical analog of ethanol) has been observed in Sgr B2(N2), though the confirmation of this detection is yet to come. It is very likely that higher order thiols could be observed in these regions. In this paper, we study the formation of monohydric alcohols and their thiol analogs. Based on our quantum chemical calculation and chemical modeling, we find that the Tg conformer of 1-propanethiol is a good candidate of astronomical interest. We present various spectroscopically relevant parameters of this molecule to assist in its future detection in the interstellar medium. © 2017. The American Astronomical Society. All rights reserved.

Bolaji A.L.,Federal University, Wukari | Michael I.,VConnect Global Services Ltd | Shola P.B.,University Of Ilorin
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Office-space allocation (OFA) problem is a class of complex optimization problems that distributes a set of limited entities to a set of resources subject to satisfying set of constraints. Due to the complexity of OFA, numerous metaheuristic-based techniques have been proposed. Artificial Bee Colony (ABC) algorithm is a swarm intelligence, metaheuristic techniques that have been utilized successfully to solve several formulations of university timetabling problems. This paper presents an adaptation of ABC algorithm for solving OFA problem. The adaptation process involves integration of three neighbourhood operators with the components of the ABC algorithm in order to cope with rugged search space of the OFA. The benchmark instances established by University of Nottingham namely Nothingham dataset is used in the evaluation of the proposed ABC algorithm. Interestingly, the ABC is able to produced high quality solution by obtaining two new results, one best results and competitive results in comparison with the state-of-the-art methods. © Springer International Publishing AG 2017.

Etim E.E.,Indian Institute of Science | Etim E.E.,Federal University, Wukari | Arunan E.,Federal University, Wukari
European Physical Journal Plus | Year: 2016

Accurate enthalpies of formation are reported for known and potential interstellar isomeric species using high-level ab initio quantum-chemical calculations. A total of 130 molecules comprising of 31 isomeric groups and 24 cyanide/isocyanide pairs with molecules ranging from 3 to 12 atoms have been considered. The results show an interesting relationship between energy, stability and abundance (ESA) existing among these molecules. Among the isomeric species, isomers with lower enthalpies of formation are more easily observed in the interstellar medium compared to their counterparts with higher enthalpies of formation. Available data in the literature confirm the high abundance of the most stable isomer over other isomers in the different groups considered. Potential for interstellar hydrogen bonding accounts for the few exceptions observed. Thus, in general, it suffices to say that the interstellar abundances of related species could be linked to their stabilities if other factors do not dominate. The immediate consequences of this relationship in addressing some of the whys and wherefores among interstellar molecules and in predicting some possible candidates for future astronomical observations are discussed. © 2016, Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg.

Al-Betar M.A.,Al - Balqa Applied University | Awadallah M.A.,University of Palestine | Khader A.T.,Universiti Sains Malaysia | Bolaji A.L.,Federal University, Wukari
Applied Soft Computing Journal | Year: 2016

This paper proposes a tournament-based harmony search (THS) algorithm for economic load dispatch (ELD) problem. The THS is an efficient modified version of the harmony search (HS) algorithm where the random selection process in the memory consideration operator is replaced by the tournament selection process to activate the natural selection of the survival-of-the-fittest principle and thus improve the convergence properties of HS. The performance THS is evaluated with ELD problem using five different test systems: 3-units generator system; two versions of 13-units generator system; 40-units generator system; and large-scaled 80-units generator system. The effect of tournament size (t) on the performance of THS is studied. A comparative evaluation between THS and other existing methods reported in the literature are carried out. The simulation results show that the THS algorithm is capable of achieving better quality solutions than many of the well-popular optimization methods. © 2016 Elsevier B.V. All rights reserved.

Ogwueleka F.N.,Federal University, Wukari | Misra S.,Atilim University | Ogwueleka T.C.,University Of Abuja | Fernandez-Sanz L.,University of Alcalá
Acta Polytechnica Hungarica | Year: 2014

Road traffic accidents (RTA) are one of the major root causes of the unnatural loses of human beings all over the world. Although the rates of RTAs are decreasing in most developed countries, this is not the case in developing countries. The increase in the number of vehicles and inefficient drivers on the road, as well as to the poor conditions and maintenance of the roads, are responsible for this crisis in developing countries. In this paper, we produce a design of an Artificial Neural Network (ANN) model for the analysis and prediction of accident rates in a developing country. We apply the most recent (1998 to 2010) data to our model. In the design, the number of vehicles, accidents, and population were selected and used as model parameters. The sigmoid and linear functions were used as activation functions with the feed forward-back propagation algorithm. The performance evaluation of the model signified that the ANN model is better than other statistical methods in use.

Ugbogu O.C.,Federal University, Wukari | Ogbonna C.E.,Abia State University
36th WEDC International Conference: Delivering Water, Sanitation and Hygiene Services in an Uncertain Environment | Year: 2013

The microbial quality of two man-made lakes that serve as sources of water to a rural community was investigated. Quantitative examination of microorganisms revealed a total heterotrophic bacterial count range of 2.0 - 5.0 × 104cfu/ml and 2.2 - 6.0 × 104cfu/ml for Lake 1 and Lake 2 respectively for the months sampled. Total coliform count ranged from 1.5 - 2.6 × 104cfu/ml and 1.8- 3.0 × 104cfu/ml for Lake 1 and Lake 2 respectively. Salmonella and Shigella species occurred more in the water samples during the rainy season than dry season. The microbial quality of the lakes show that the water is not suitable for drinking and other domestic purposes and poses a public health risk to children and other groups that use it for recreational purposes.

Oladoja N.A.,Adekunle Ajasin University | Adelagun R.O.A.,Federal University, Wukari | Ahmad A.L.,Universiti Sains Malaysia | Unuabonah E.I.,Redeemer's University | Bello H.A.,Adekunle Ajasin University
Colloids and Surfaces B: Biointerfaces | Year: 2014

A novel adsorbent, magnetic, macro-reticulated cross-linked chitosan (MRC) was synthesised for the removal of tetracycline (TC) from water using a source of biogenic waste (gastropod shells) as a pore-forming agent. The insertion of crosslinks into the chitosan frame was confirmed by FTIR analysis, while the stability of the MRC was demonstrated via a stability test performed in an acidic solution. The enhanced porosity of the MRC was confirmed by the evaluation of its porosity, a swelling test and the determination of its specific surface area. The time-concentration profile of the sorption of TC onto the MRC demonstrated that equilibrium was attained relatively quickly (120min), and the data obtained fitted a pseudo second order (r2>0.99) kinetic equation better than a pseudo first order or reversible first order kinetic equation. The optimisation of process variables indicated that the sorption of TC onto the MRC was favoured at a low solution pH and that the presence of organics (simulated by the addition of humic acid) negatively impacted the magnitude of TC removal. The area of coverage of TC on the MRC (2.51m2/g) was low compared to the specific surface area of the MRC (47.95m2/g). The value of the calculated energy of adsorption of TC onto the MRC was 100kJ/mol, which is far above the range of 1-16kJ/mol stipulated for physical adsorption. © 2014 Elsevier B.V.

Oladoja N.A.,Adekunle Ajasin University | Adesina A.O.,Adekunle Ajasin University | Adelagun R.O.A.,Federal University, Wukari
Ecological Engineering | Year: 2014

Gastropod shell (GS), whose distribution is worldwide and mineralogical assemblage is aragonite, was packed in a glass column and evaluated for phosphate capture and recovery from aqua system. The column reactor was operated in a batch-continuous mode, considered as a close approximation to a practical water treatment system, for 30 days. The time-concentration profile parameters were derived at different influent phosphate concentrations and hydraulic residence time (HRT) to determine the performance efficiency of the reactor column. The mechanism of phosphate removal was investigated and phosphate fractionation protocol was employed to elucidate the form and pattern of phosphate distribution in the spent reactor. Variations in influent phosphate concentration and HRT had minimal influence on the time-concentration profile parameters and the performance efficiency of the column reactor within the process variables studied. The first order rate constant (k1) showed that increase in the HRT of the influent in the SS column reactor does not enhance the phosphate removal. The value of the saturation index (SI) obtained over the 30 days period were all positive and the thermodynamic parameter (δG) was <0 which is an indication of supersaturation, the significant role of precipitation as a mechanism of phosphate removal in the reactor and spontaneity of the precipitation reaction. The order of distribution of each fraction of P, relative to the total phosphorus (T-P) in the phosphate laden SS, is as follows: dicalcium phosphate (Ca2-P) (42.5%)>ten-calcium phosphate (Ca10-P) (40.50%)>octacalcium phosphate (Ca8-P) (16.65%)>occluded phosphate (O-P) (0.35%). The simple appraisal of the fertilizer value of the spent reactor showed that it would preferentially serve as a soil conditioner cum fertilizer in acidic soil. © 2014 Elsevier B.V.

Onogwu G.O.,Federal University, Wukari
Agricultural Economics (Czech Republic) | Year: 2014

The trade liberalization processes of the Economic Community of West African States (ECOWAS) are implemented through such interventions like free international trade, common external tariff wall, the consolidation or freezing of custom duties and non-tariff barriers to the intra-trade among others. However, the extent to which these efforts have translated to the intra-industry trade in the prepared foodstuff products has not been investigated yet. The objectives of this study are to assess the intra-industry trade theory in cereal and miscellaneous edible preparations; to evaluate the growth rates of simultaneous exports and imports in these prepared foodstuff sub-sections; to evaluate the extent of the intra-industry trade in the sub sections, and to determine the effects of the Nigeria's and partners' characteristics on the intra-industry trade. The results revealed that the intra-industry trade in cereal preparations are positively and significantly influenced by the partners' gross national income (GNI) per capita and the partners' foreign direct investment (FDI), but they are negatively influenced by the Nigeria's household final consumption expenditure. Also, the intra-industry trade in miscellaneous edible preparations is influenced positively by the partners' GNI per capita and the partners' households' final consumption expenditures, while the Nigeria's foreign direct investment and the value added by manufacturing negatively influence the intra-industry trade in the product sub-sections within the ECOWAS sub-region. Both exports and imports growth rates of these products fluctuate, but more in the imports of miscellaneous edible preparations. Cost saving options in transportation, the use of efficient machines during the production, processing and packaging are recommended.

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