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ABSTRACT This research work is aimed at using the energy and exergy analysis with thermodynamic data to suggest improvements in the performance of steam and gas turbine power plants. In this regard, specific data from Egbin steam power plant and Geregu I gas turbine power plant were used for the analysis.   In the analysis, scientific tools such as Engineering Equation Solver  (EES)  programme with  built-in  functions  for  most  thermodynamic  and ...

ABSTRACT Construction industry has complexity in it nature because it contains large number of parties such as clients, consultants and contractors. The factors that influence construction management practice differ from country to country, due to prevailing conditions. The objective of this project is to identify factors that influence construction management practice in Nigeria construction industry and elicit perceptions/ranking of the severity using relative importance index of the various factors. A ...

ABSTRACT Clay soil posses a great threat causes problem on civil engineering structures due to its tendency to swell when it is in contact with water and shrinks when they dry out. Stabilization using chemical admixtures is the oldest and popular method of soil improvement. In this study, an investigation was conducted to explore the possibility of using processed termite mound as a stabilizing admixture to improve clay soils. This ...

CHAPTER ONE 1.0     INTRODUCTION 1.1     RESEARCH BACKGROUND Concrete is a versatile engineering material consisting of cementing substance, aggregates, water and often controlled amount of entrained air. It is initially a plastic, workable mixture which can be moulded into a wide variety of shapes when wet. The strength is developed from the hydration reaction between cement and water. The products, mainly calcium silicates, calcium aluminates and calcium hydroxide are relatively insoluble ...

ABSTRACT In this work, models for predicting six structural characteristics and cost of sand-quarry dust blocks  were  developed.  Three  model  equations  namely  Scheffe’s  simplex  lattice design (pseudo component), Scheffe’s simplex lattice design (component proportion) and Osadebe’s  model  were  developed  for  each property.  The  properties  investigated  were Compressive strength, Water absorption and Split tensile strength. The others are Static modulus of elasticity, Flexural strength and Shear strength. The models were fitted ...

ABSTRACT The over dependent on the utilization of industrially manufactured soil improving additives (cement, lime etc), have dept the cost of such stabilized soils financially high.   The hitherto have continued to deter the underdeveloped  and poor nations of the world  from providing accessible  pavement  to their  rural dwellers  who  constitute  the higher  percentage  of their population and are mostly, agriculturally dependent.   A number of researchers have studied the physical and ...

ABSTRACT This research work presents the analysis of rectangular plate on Winkler’s foundation using second degree characteristic orthogonal polynomials.   The plates were of three different edge conditions: Thin Rectangular Plate pinned on all edges (SSSS), Thin Rectangular Plate clamped on all edges (CCCC) and Thin Rectangular Plate pinned on two opposite edges and clamped on the other two edges (CSCS). The exact displacement and bending moment functions of these plates ...

ABSTRACT The study aimed at investigating groundwater pollution in the vicinity of a municipal solid waste (MSW) dumpsite in order to reduce the risks of groundwater contamination and spread of water-borne diseases. To achieve this, the research tools used include model formulation, finite volume analysis, field collection of soil samples at Enugu Waste Management Authority (ESWAMA)  dumpsite  at various  depths  along  radial  sampling  lines during  wet  and dry season periods. ...

ABSTRACT This study brought to the fore, a critical evaluation of the potentials of natural gas in the economic development of Nigeria. Natural gas option was considered the best alternative energy  resource  to  other  resources  for  optimizing  income  earning,  indigent  capacity building and the socio-economic development of an over populated Nigeria. Data and statistical reports from the various oil companies ere collaborated with the central bank economic report to determine ...

ABSTRACT Bioremediation  has  been  proven  to  be  the  most  effective  method  of  cleaning  up  oil contaminated soils through the application of nutrients and microorganism to contaminated soils.  Hence,  this  research  was  aimed  at  investigating  the  effects  of  particle  sizes  on bioremediation of crude oil polluted sandy soils. Six different soil samples were sieved using the B.S sieve sizes. The sieve sizes were classified into X and Y such that X ...

ABSTRACT The concentration of six heavy metals and six of sixteen (16) US EPA priority polycyclic aromatic hydrocarbons (PAHs) in water, fish and sediment samples of the confluence of rivers Niger and Benue were investigated in triplicates using atomic absorption spectrophotometer (AAS) for the heavy metals determination and gas chromatography coupled with mass spectrometer detector for the  PAHs  after  acid  digestion  of  the  samples  for  heavy  metals,liquid-liquid  and  solid-liquid extraction ...

ABSTRACT The synthesis of ten new alkynylated  derivatives of angular phenoxazine  and  alkynylated naphthoquinone    was   thoroughly   investigated.    The   first   intermediate,    6-chloro-5H- benzophenoxazin-5-one  was obtained  by the condensation  of  2-aminophenol  with 2,3- dichloro-1,4-  naphthoquinone  in  the  presence  of  anhydrous  sodium  tricarbonate  (IV)  . Thereafter,  the  intermediate  and  2,3-dichloro-1,4-naphthoquinone  were  each suggested  to Sonogashira cross–coupling reaction under copper-, amine-, and solvent free conditions at 80 oC  with  five  different  terminal  alkynes  using ...

ABSTRACT In this study, a series of N-pyridin-3-yl substituted acetamide has been synthesized. The reaction of phenylsulphonyl chloride with various amino acids in basic medium yielded phenylsulphonamido alkanoic acid which, on chlorination with thionyl chloride, gave acid chloride derivatives of phenylsulphonamido alkanoic  acid  in  situ.  The  acid  chloride  derivatives  on condensation with  3-aminopyridine  gave  corresponding acetamide  in  good  to excellent yield. The compounds were characterized by FTIR, 1H-NMR and 13C- ...

ABSTRACT The kinetics and mechanisms of the redox reactions of oxidant,   -adipato-di(N,N/- bis(salicylidene)ethylenediaminatoiron(III),,hereafter      denoted      as Fe2adi, with the thiols L-cysteine (LSH), thiourea (USH),  thioglycolicacid(GSH),2– mercaptobenzothiazole  (BTSH)   and  benzylmercaptan   (BSH)  have  been  studied spectrophotometrically  at  495  nm  in  aqueous  perchloric  acid,  I=0.01mol  dm-3 (NaClO4) and at 29  1oC. The stoichiometry of 1:1 was obtained for Fe2adi – LSH, Fe2adi – GSH and Fe2adi –BTSH systems while 1:2 was obtained for Fe2adi ...

ABSTRACT Heavy  metal  concentrations  and  degradation  efficiency  of  total  petroleum  hydrocarbons (TPHs) on environment in Ibeno Local Government Area, Akwa Ibom  State, Nigeria was investigated.  Experimental  design  method  was  adopted  for  this  study.  Fifteen  composite samples each of soil, leaves of Telfairia occidentalis, sediment and water were collected in December 2012 and June 2013. The sediment and water samples were collected using corer and clean plastic bottles respectively. Soil and ...

AB STRACT The effect  of torrefaction temperature  and residence  time  on the fuel properties  of lignite,  biomass (coconut  shells and cassava peels) and their blends was investigated.  The samples were subjected  to three  torrecfaction  temperatures   (200,  260  and  300C)  and  at  two  residence  times  (10  and  20 minutes) using programmable  muffle furnace.  Blends of torrefied  lignite and biomass were prepared in two different ratios (80:20  and 70:30).  The energy content, ...

ABSTRACT The  highly nucleophilic  bridging  sulfide  centers  in  bis(μ-sulfido)tetrakis(triphenylphosphine) diplatinum(II),    enables  the  incorporation  of any organic  functionality  (R) through facile monoalkylation to form cationic complex +.  The organic electrophiles; N,N’-(2-dichloroethyl) piperazine-4-carboxi-amine,  N-(2-chloroethyl) morpholine- 4-carboxi-amine,    and   N-(2-chloroethyl)-1-methylpiperazine-4-carboxi-amine   derived    from isocyanate were synthesised by the reactions of piperazine, morpholine and  methyl piperazine respectively  with  2-chloroethyl  isocyanate  in  diethyl  ether.  This  potentially  formed  highly functionalised  organic  electrophiles  N-(2-chloroethyl)  morpholine-4-carboxi-amine,  and N-(2- chloroethyl)-1-methylpiperazine-4-carboxi-amine ...

ABSTRACT The synthesis and characterization of zeolite and its application in adsorption of nickel from aqueous solution was investigated. Synthesis of zeolite was performed at 90 oC for 8 h. The size of the resulting crystals increased with an increase in the water content of the reaction mixture. The synthesized zeolite was characterized by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) techniques. Crystal structure of the product was determined ...

ABSTRACT The roots of Dennettia tripetala and Milicia excelsa were analyzed for the presence of phytochemicals. Five different solvents, which include methanol, ethanol, ethyl acetate, butanol and water, were used for the extraction of the phytochemicals.The root of Dennettia tripetala contained alkaloids, terpenoids, flavonoids, saponins, phenols, steroids and glycosides in varying degrees of abundance in the different solvents with tannins not detected in all the solvents. Milicia excelsa contained all ...

ABSTRACT The active drug content and weight uniformity of five brands (A – E) of Amoxicillin Trihydrate capsules in Nsukka open drug market were evaluated to ascertain their quality assurance using UV visible spectroscopy and gravimetry. This study has shown that all the brands analyzed showed significant variations with respect to active drug content determination for the three brands B, D and E. Using United State Pharmacopoeia (USP) and British ...