Volume 10, No. 1, 2022

Time measurements are carried out for the case of Newtonian liquid removed from a large cylindrical tank by means of connecting pipe. The connecting pipe is attached at the center of the bottom of the tank.The parameter that is used in the present work is diameter of connecting pipe.The time data so obtained is used to establish a relation between friction factor and Reynolds number.Two empirical equations are developed which relate the friction factor with Reynolds number. The developed friction factor equations are verified with the literature values on drain time. The verified equations have been found to be satisfactory in the Reynolds number range of 4000 to 26000.

Keywords: Drain time, Newtonian liquid, Friction factor, Turbulent flow.

This study surveyed Decision Tree (DT), Logistic Regression (LR), and Support Vector Machine (SVM) algorithms and their corresponding ensembles to determine the frequency of their applications in different sectors. It further reviewed their strengths and weaknesses considering machine learning accuracy matrices, probability estimation and other features. Descriptive statistics was used to analyse the survey which revealed that SVM yielded better predictive performance in different application areas. The study pointed out that no algorithm out rightly outperforms the other as the performance depends on the dataset, and recommended further work on the ensembles of DT and LR to leverage their fundamental advantages. Following the report on the strength and weaknesses, a simple workflow was suggested. Finally, the application areas of the algorithms were reviewed which pointed out that social media is not primarily an application area but a web application for generating datasets for predictive analytics.

Keywords: Decision tree, Ensembles, Logistic regression, Machine Learning, Predictive Analysis, Support Vector Machine.

Digital control systems design often involves either the use of logic tables or State Transition Tables (STT) and these tables can be implemented using a multiplexer. Folding technique as a necessity for multiplexer based design has been highlighted. Where the height of the table is too large for the available multiplexer, the table could be folded by half before implementing. By observing the pattern on a given logic or STT table, an input column can be folded into the output column(s) to reduce the table by half. How this folding technique reduces the programming complexity that would have been encountered if the original table was programmed was demonstrated using both logic table and STT without losing its content.

Keywords: DProgramming complexity, Logic table, Folding technique, Multiplexer, State Transition, Table

This work studied the Effect of Moringa oleifera leaf powder on the Oxalate content and colour change of cocoyam during Achicha ede preparation. The Central Composite Design from the Design Expert (13) software was used in the design of experiment. The process variables were boiling time, concentration of M. oleifera leaf powder and quantity of cocoyam. A total of 21 samples were used for this study. The results obtained for the Proximate analysis showed that the samples differed significantly (p<0.05), and had values that ranged between 4.39-6.35 %, 0.37-0.56 %, 1.58-2.03 %, 1.48-1.86 %, 4.46-6.36 %, and 83.24-86.85 %, for protein, fat, ash, fibre, moisture, and carbohydrate respectively. Also, the values for the methanolic extract of M. oleifera leaf powder at concentrations of 10, 12.5, 15, 17.5, and 20 µg/ml, were 15.5, 18.33, 24.55, 29.14, 35.66 % and 4.66, 5.55, 6.68, 7.25, 8.80 % for DPPH and ABTS radical scavenging assays respectively. Further analysis revealed that the Oxalate content and colour change of the samples ranged between 0.25-0.86 mg/100g and 0.01-0.35 respectively. The interaction plots and equations obtained showed that the interaction of boiling time and quantity of M. oleifera leaf powder facilitated the reduction of oxalate content and colour change of the samples. Sensory evaluation was carried out on all 21 samples cooked with pigeon pea (fio-fio). The results obtained revealed that achicha ede cooked with M. oleifera leaf powder was liked very much (8.95). From the optimization plot, the optimal condition for preparing achicha ede was boiling for 1.29 h with the addition of 15 g of M. oleifera leaf powder. Achicha ede prepared under this condition will have an oxalate content of 0.39 mg/100g, colour change of 0.19 and overall acceptability of 6.64.

Keywords: Cocoyam chips, Moringa oleifera leaf powder, Oxalate content, Colour change, Pigon pea,
Response Surface Methodology, Face centred central composite design

In recent time, government, organizations and businesses are dissatisfied over the inflexible websites provided by website development companies that have failed to meet their routine operational demands. In this light, we explore the distinctions amongst the types of websites and the different tools that are used for building websites which have posed serious problems, confusions and debates amongst developers and their clients. We equally examined the features of the different types of the websites and the tools that would enable organizations determine the type of website they need and the corresponding tools most effective for actualizing the overall goal of the business. Finally, discussion were made to enable clients decide the tools appropriate for their type of businesses websites that would reduce the cost of building and maintaining the website and also enhance performance and productivity.

Keywords: Static website, Dynamic websites, Hybrid website, Content Management System, Website Builder, Hand-coded Website, Frameworks, APIs