https://publisher.uthm.edu.my/ojs/index.php/JST/issue/feed Journal of Science and Technology 2020-12-29T12:15:42+08:00 Ahmad Hadi Ali jst@uthm.edu.my Open Journal Systems <p>Journal of Science and Technology (JST) aim to publish original and high quality articles (be it in theoretical or applied perspectives) on all aspects of science and technology. This peer reviews journal seek to publish TWO (2) issues annually.</p> <p>JST is devoted in providing a platform for the publication of full-length articles focusing (and not limited) to research areas as listed below:</p> <p>Physcis, Chemistry, Mathematics, Statistic, Biodiversity, Food Science and Technology as well as Engineering and Education Science.</p> https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/6221 Effect of Anisaldehyde as Corrosion Inhibitor for Aluminium in Sulphuric Acid Solution 2020-11-17T11:01:18+08:00 Musa Husaini musahusaini36@gmail.com <p>The inhibition effect of anisaldehyde on the corrosion of aluminium in sulphuric acid was investigated by weight loss method and characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) analyses. The effect of different inhibitor concentrations was studied at varying temperature (308, 313 and 318 K). It was found that the percentage of inhibition efficiency (% I.E.) increases with increase of inhibitor concentration and decreases with increase in temperature. The values of activation energy and half-life were found to be higher in inhibited acid solution compared to uninhibited acid solution, while that for the rate constant reduced from uninhibited to inhibited acid solution. The negative values of Gibbs free energy of adsorption confirmed the spontaneity of the process. Other thermodynamic parameters such as enthalpy and entropy were also evaluated and discussed. The investigation of adsorption isotherm model indicates that the inhibitor fitted to Langmuir isotherm model. Result of SEM analysis shows how the inhibitor reduced the acid attack on the aluminium surface, and FTIR analysis result of the corrosion product proves the formation of thin layer of inhibitor molecules on aluminium surface.</p> 2020-11-17T10:57:45+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/6623 Strategies for Engendering Health and Safety Culture in Construction Firms in Abuja, Nigeria 2020-11-17T11:01:18+08:00 Richard Jimoh rosney@futminna.edu.ng Luqman Oyewobi l.oyewobi@futminna.edu.ng Najeem Uthman najeemlawal@futminna.edu.ng Kabir Ibrahim ibrahimmsc2259@gmail.com Ahmed Salawu salawu.ahmed@futminna.edu.ng <p>Many countries have put in place policies and legislation to reduce accidents and diseases on construction sites though having varied degree of comprehensiveness, the extent of implementation, will and capacity of enforcement. In spite of these efforts, it has been revealed that the increase in the rate of unsafe acts and rate of fatalities in the construction industry is significant due to poor safety culture. Hence, this study assessed the level of health and safety (H&amp;S) culture in construction firms in Abuja by self-administering a total of 152 questionnaires on H&amp;S issues to construction professionals. It included Builders, Quantity Surveyors, Architects, Civil Engineers, and Project Managers/supervisors who were involved in construction works. The data obtained were analysed using percentages and mean scores. It was discovered that despite the increasing growth in the construction firms in Nigeria, the H&amp;S culture practice in construction firms is highly fragmented and poorly implemented. It is recommended among others that there should be high commitment from the top of organisations which will in turn produce higher level of motivation and commitment throughout the organisations.</p> 2020-11-17T10:51:27+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/6007 Analysis of Land Use Land Cover Changes Using Remote Sensing Data and Geographical Information Systems (GIS) at an Urban Set up of Damaturu, Nigeria 2020-11-17T11:14:04+08:00 Karagama Kolo kkgeidam@gmail.com Nor Aizam Adnan nor_aizam@uitm.edu.my Baba Alhaji Umar kkgeidam@gmail.com <p>Change detection is useful in many applications related to land use and land cover change (LULCC), such as shifting cultivation and landscape changes. Land degradation and desertification. Remote sensing technology has been used for the detection of the changes in land use land cover in Damaturu town Nigeria. The main objectives of this research was to derive the land use/cover change map of Damaturu town from 1986 to 2017 and to quantify land use/ land cover change in the study area. Methodology employed while carry the research includes three satellites images for the year 1986, 1998 and 2017 were downloaded from USGS websites and used for detecting the land cover changes. Ground truth points were collected using google images and used for verification of image classifications. The accuracy of images classification was checked using ground truth point which showed the overall accuracy of 84.6% and a kappa coefficient of 0.89 which indicated that the method of classification was accurate. In the process of the research work, an increased was recorded in the built-up area which rose from 7.2% to 22.0%, open space increased from 10.8 to 22.8%, vegetation from 4.0% to 9.7%, water bodies from 0.0% to 0.1% while agricultural land decreased from 78% to 45.4% due to increase in interest of building as a result of the expansion of the town. The study arrived at the conclusion that there has been a significant land use change due to increase in population and development interest in built up areas which resulted in increased of amount of agricultural land being converted to build up areas over the period of 31 years.&nbsp;</p> 2020-11-17T11:00:20+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/7387 Effect of Soil Amendment with Neem Seed Cake on Tomato Plant Growth and Development, Fruit Quality and Storability 2020-12-09T09:03:08+08:00 Jean Aghofack Nguemezi aghofack@yahoo.fr Braogue Doumdi Roger aghofack@yahoo.fr <p>In Cameroon, most of tomatoes (<em>Solanum lycopersicum)</em> are produced in the Western Highlands. During the period of production peaks farmers are faced with enormous postharvest losses. Furthermore, necessary great quantities of chemical inputs are some of potential threats to fruits quality and the environment. Since events occurring in the field finally impact the quality and storability of agricultural produces, the present study aimed at improving these parameters through soil amendment with neem seed cake (NSC) as bioeffector while preserving the environment.&nbsp; The NSC was therefore used at four doses (0 g, 4 g, 8 g and 12 g per plant). The experiment was carried out in a complete randomized block design with six repetitions in each treatment. Treatments began at the 2<sup>nd</sup> week after seedling transplantation and were continued at three weeks intervals. The plant growth and development, fruit quality and storability parameters were determined. The plant height, stem diameter, number of leaves per plant, number of branches per plant, time elapsed between the seedling transplanting date and the date of the appearance of the first flower, number of flower buds per plant, number of flowers per plant, number of grapes per plant, number of fruits per plant, fruit physiological weight loss (PWL), fruit titratable acidity (TA) and fruit senescence rate were positively influenced by the soil application of NSC, the dose of 12g/plant having been the most efficacious. The increase in TA was an indication of an improvement of the quality whereas the reduction of the PWL and the decrease in the rate of senescence were in favor of a better postharvest conservation of tomato fruits as results of soil amendment with NSC.</p> 2020-12-09T09:03:08+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/6937 Visible Light Channel Modeling for High-data Transmission in the Oil and Gas Industry 2020-12-09T09:05:59+08:00 Augustus Ibhaze eibhaze@unilag.edu.ng Patience Orukpe orepat11@gmail.com Frederick Edeko efrede00@gmail.com <p>High-speed communication has been a major concern in the oil and gas field for downhole data acquisition, transmission and exploration. This has necessitated this investigation of the promising license-free broadband visible light spectrum for improved communication reliability in the oil and gas field. A visible light communication (VLC) multiple input multiple output (MIMO) communication link is proposed as the drill pipe wireless communication link. The proposed model was seen to perform more optimally using the maximum likelihood detection technique in comparison with zero forcing at reduced bit error rates and improved throughput relative to increasing values of the signal to noise ratio (SNR). Although this investigation proposes a novel design of the wireless drill pipe, its adoption will greatly reduce exploration time thereby increasing the return on investment as data transmission speed increases.</p> 2020-12-09T09:05:59+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/7020 Analysis and Simulation of Airfoil with Joukowsky Transformation 2020-12-09T09:07:12+08:00 Eduward Hutabarat eduward@iteba.ac.id Vitri Aprilla Handayani vitri@iteba.ac.id <p>The equation of airfoil and its complex potential function can be produced from the Joukowsky transformation. The airfoil will call Joukowsky airfoil because it comes from the transformation. Using Wolfram Mathematica as a software simulator, this transformation produce airfoil with any variant graph and position, also mean camber line and position of trailing edge of airfoil. The complex potential function can also produce equation and graph of equipotential &amp; streamlines.</p> 2020-12-09T09:07:11+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/6705 Human Health Risk Assessment Data of Selected Trace Elements’ Concentrations in Floodplain Water of Jebba-North, Central Nigeria 2020-12-29T12:15:02+08:00 Oladele Ajiboro Omotoso omotoso.oa@unilorin.edu.ng Olusola Johnson Ojo Omotoso.oa@unilorin.edu.ng Olusegun Omoniyi Ige omotoso.oa@unilorin.edu.ng Oluwadamilare Cole omotoso.oa@unilorin.edu.ng Olumide Okunnoye omotoso.oa@unilorin.edu.ng Adebola Oreoluwa Ariba omotoso.oa@unilorin.edu.ng Michael Chukwudi Olelewe omotoso.oa@unilorin.edu.ng <p>The consumption of the water from the floodplain of River-Niger by denizens of Jebba-North pose a significant health risk, as it is being exposed to waste from industries, agricultural facilities and households from the congested urban areas. The risk is more pronounced as people living near floodplain uses it for their domestic needs. The study uses ICP-MS method to analyse water from the samples’ area; and the exploratory analyses of the water for the following trace elements: "Al, As, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn" were carried out. The analyses showed that the mean daily intake by both adult and children, using the Hazard Index (HI) and Hazard Quotient (HQ) of the elements, except Cr and Pb was &gt;1; this is above the standard prescription of &lt;1 for non-carcinogenic health risk. The standard limits for carcinogenic elements, Cr and Pb, are 10<sup>-6</sup> and 10<sup>-4 </sup>respectively. The test results for both adult and children showed that their intake of Cr and Pb elements from the flood plain is higher than the limit. Conclusively the consumption of water from River- Niger floodplain at Jebba-North pose a health risk that are both carcinogenic and non-carcinogenic in nature.</p> 2020-12-29T12:15:02+08:00 Copyright (c) 2020 Journal of Science and Technology https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/6833 Corrosion Inhibition of Mild Steel in Tetraoxosulphate (VI) Acid Using Mangifera Indica and Citrus Sinensis Peels Extracts 2020-12-29T12:15:42+08:00 Babatope Abimbola Olufemi bolufemi@yahoo.com Taiwo Arowora taiwoarowora@rocketmail.com <p>The effects of corrosion and inhibitive effects of two plants peel extracts of mango (Mangifera indica) and orange (Citrus sinensis) were investigated on samples of mild steel immersed in 1 M tetraoxosulphate(VI) acid at ambient temperatures. Statistical probe with ANOVA and Bonferroni-Holm Posthoc Significance Test was used. The inhibitive effect of Mangifera indica and Citrus sinensis peels extracts on mild steel corrosion in H2SO4 solution was studied using weight loss techniques for ten days. The results showed that the inhibition efficiency was found to increase with increasing concentration for both plant peels extracts with concentrations ranging from 0.2 g per litre to 1.0 g per litre of solution. A maximum inhibition efficiency of 50.54 and 50.21% was observed in the concentration of 1.0 g per litre of Mangifera indica and Citrus sinensis peels extracts respectively. Results obtained revealed that corrosion inhibition of mild steel in H2SO4 acid depends on the relative concentration of the inhibitors applied. Mangifera indica peel extracts was slightly more effective against corrosion in 1 M H2SO4 solution for mild steel.</p> 2020-12-29T12:15:42+08:00 Copyright (c) 2020 Journal of Science and Technology