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Author: ASHAMU SIKIRU OYERINDE

Affiliation: Federal University of Technology, Owerri, Imo State, Nigeria.

 

                                                                                                              ABSTRACT

The study is an investigation into the impact of monetary policy measures on bank credit, covering the period, 1980 – 2003. Specifically, we examined the influence of each of the following instruments namely, liquidity ratio, interest rate, cash reserve requirement, minimum rediscount rate and treasury bill on bank credit.Two major statistical tools were adopted, while a time-series analysis was conducted to observe the movement of these named variables as against the movement in bank loans and advances, a multiple regression test was however conducted to determine their effects on total loans and advances of banks. Some of the major findings of these tests confirm the existence of a high correlation between all the explanatory variables taken together and total bank loans and advances. This was further corroborated by the existence of a significant relationship between the monetary policy instruments and total bank loans and advances. However, in terms of the contribution of each of the explanatory variables to bank credit, only treasury bills rate and the liquidity ratio proved to be significant contributors to bank credit at 2% and 5% respectively.However, beside these two explanatory variables that bear an inverse relationship (negative), also the sign of the cash reserve ratio equally meets the a priori expectation while both the minimum rediscount rate and interest rate failed to meet the a priori test in this regard. Based on these results, some of the major recommendations are that monetary authorities should rely more on the use of treasury bills, liquidity ratio and cash reserve ratio as measures to influence the level and direction of bank credits, having all passed the a priori test. Moreso, both the minimum rediscount rate and interest rate need further re-examination with the aim of making them more responsive to the needs of the economy.

Author: OKOLI CHINONSO NNAMDI
Affiliation: Affiliation :  Federal University of Technology, Owerri, Imo State , Nigeria.
                                                                     

                                                                                                           ABSTRACT
This research work presents buckling and vibration analyses of line continuum using 6 x 6 stiffness matrices. The study used six term Taylor McLaurin’s polynomial series shape function and the stiffness matrices were developed using energy variational principle. Two deformable nodes were considered at the centre of the continuum which brings the number of deformable nodes to six. The six term Taylor McLaurin’s shape function was substituted into strain energy equation and the resulting functional was minimized, resulting in a 6 x 6 stiffness matrix. The six term shape function was also substituted into the geometric work and inertia work (kinetic energy) equations respectively and minimized to obtain 6 x 6 geometric and inertia stiffness matrices for buckling and vibration analyses respectively. They were used together with the traditional 4 x 4 matrices, in classical and numerical studies for buckling and vibration analyses of four line continua and a portal frame. The results of the critical buckling load, from classical analysis (exact solution) for P – R, C – C, C – R and C – F columns were 9.87KN, 39.45KN, 20.19KN and 2.47KN respectively. Results of the classical buckling analysis of the present study (6 x 6 stiffness matrices) for P – R, C – C, C – R and C – F columns were 9.875KN, 42KN, 20.286KN and 2.47KN respectively. The results of natural frequency from classical analysis (exact solution) for P – R, C – C, C – R and C – F beams were 9.87Hz, 22.37Hz, 15.42Hz and 3.52Hz respectively, while the results of natural frequency from classical analysis of the present study (6 x 6 stiffness system) for P – R, C – C, C – R and C – F beams were 9.87Hz, 22.45Hz, 15.43Hz and 3.52Hz respectively. Results of fixed base portal frame analysis using 4 x 4 stiffness matrices were 0.7172KN and 2.4228Hz for critical buckling load and natural frequency respectively, while the results of fixed base portal frame manalysis using the present study (6 x 6 stiffness matrix) were 0.9795KN and 2.5291Hz for critical buckling load and natural frequency respectively. The above results showed that Taylor MaClaurin’s series (polynomial) truncated at six term, gave better approximate solution.
Keywords: Buckling; Classical; Deformable Node; Geometry; Inertia; Line Continuum; Numerical; Shape Function; 6 x 6 Stiffness Matrix; Vibration.

Author : NWADIKE AMARACHUKWU NNADOZIE
Affiliation :  FEDERAL University of Technology, Owerri, Imo State , Nigeria.

                                                                                                   ABSTRACT
This research work presents the buckling analysis of isotropic rectangular plates using Ritz method. The Ritz method and polynomial series were used in the analysis. The various boundary conditions covered in this research work includes SSFS, CCFC, CSFS, CCFS, SCFC and SCFS. The polynomial series was truncated at the fifth term, which satisfied all the boundary conditions of the plate and resulted to a peculiar shape function. The resulting shape funct ion were substituted into the total potential energy functional of the Ritz method and upon minimization, the critical buckling load equations were obtained. The critical buckling loads were obtained by substituting different aspect ratios ranging from 0.1 to 2.0. The buckling loads obtained were compared with those of earlier researchers. The critical buckl ing loads K for SSFS, CCFC, CSFS, CCFS, SCFC and SCFS for aspect ratio of 1.0 are respectively: 12.97

Author: NNOROM, ONYEKACHI ONYINYECHI.
Affiliation: Federal University of Technology, Owerri, Imo State, Nigeria

                                                                                                             ABSTRACT
The factors that affect the colour yield of an acid dye on nylon fabric were investigated at a constant temperature of 500C, using C.I. Acid Yellow 23,with citric acid and sodium chloride as auxiliaries. It was observed from the absorbance results that the colour yield of C.I. Acid Yellow 23 improved with increase in time of dyeing, while the absence or increase beyond 1% (acid) and 5% (salt) reduced the colour yield of the acid dye on the nylon fabric. Also, at a constant dyeing time of 10minutes, the absence or increase in salt beyond 5% had the most effect of reducing the colour yield. The results also show that for any given time of dyeing in this study, colour yield improved when salt and acid concentrations were constant at 5% and 1% respectively.

Author :NDELEKWUTE, STANISLAUS CHINYEAKA

Affiliation: FEDERAL UNIVERSITY OF TECHNOLOGY, OWERRI.

                                                                                                              ABSTRACT

An egusi melon depoder with sinosidally arranged spikes was developed and evaluated for performance. The major components of the machine are the frame, hopper,depodding chamber and discharge outlets. The design was based on the principle of impact force. The machine is powered by a 1.5kw, 1140 rpm single- phase electric motor. The machine was designed to have a maximum capacity of 27.2kg of melon per patch. All materials used for fabricating the machine components were sourced locally. Some engineering properties necessary for melon depodding such as the pod major, intermediate and minor diameters; the pod weight, the pod volume, the pod unit density, impact velocity and impact energy were all determined and their values are 10.94cm±1.77cm,11.50cm±1.74cm,11.44cm±1.98cm, 555.83g±283.26g, 891.62cm3±457.65cm3, 0.63g/cm3±0.014g/cm3, 2.36m/s and 2.776J respectively. The determined arithmetic, geometric, square and equivalent mean diameters are approximately the same(11.3cm±1.82cm). The pod, smooth and elliptical has a sphericity of 1.03±0.015.The performance characteristics of the machine, including Depodding Efficiency, Material Discharge Efficiency (product of Seed Discharge Efficiency and Pulp Discharge Efficency) and Overall Efficiency, were evaluated at six operating speeds (200 rpm, 250 rpm, 300 rpm, 350 rpm 370 rpm and 400 rpm) and one clearance setting (10mm) between the spiked – screw conveyor and the cylinder wall. The Depodding Efficiency varies between 32% and 74% while Seed Discharge Efficiency varies between 22% and 70%. The Pulp Discharge Efficiency varies between 0.6% and 2.1%, while the Overall Efficiency varies between 7.2% and 53.4%. In all, the maximum efficiency occurred at the operating speed of 300 rpm.Data obtained from the tests were subjected to one way analysis of variance (ANOVA)and test of significance using Least Significant Difference (LSD) at 0.025 level of probability. Results of the analyses carried out indicated that there were significant differences in the means of materials discharged from and left inside the machine at different machine speeds.Also the results showed that there were significant differences in the magnitudes of depodding efficiency (Ed), seed discharge efficiency (Es), material discharge efficiency (Emd) and overall efficiency (Eo) at all speeds tested. However, there were no significant differences in the mean differences of Ep at 200 rpm versus Ep at 350 rpm, Ep at 350 rpm versus Ep at 370 rpm and Ep at 370 rpm versus EP at 400 rpm.