ORIGINAL RESEARCH ARTICLE | May 8, 2021
Synthesis, Characterization and Antibacterial Activity of Benzimidazole Derivatives
Salah Hamza Sherif, Dagne Addisu Kure, Endalkachew Asefa Moges, Akmal Nur Negash, Dessalegn Bekele, Hailu Hadaro
Page no 14-19
Derivatives of benzimidazole containing N-substituted benzyl, benzensuphonyl and acetyl were synthesized from a variety of amino acids such as Lysine and Leucine. The structures of all the synthesized compounds were elucidated by using IR, 1H-NMR, 13C-NMR.The synthesized target compounds were evaluated in vitro antibacterial activity against three bacterial strains by employing the disc diffusion method using Ciprofloxacin as a standard drug. The anti-bacterial assay revealed that the compounds (6’ b) and (6’d) showed better activity 14, 9, 8 and 12, 9, 7 mm zone of inhibition against S. auras, E. coli and K. pneumonia respectively.
ORIGINAL RESEARCH ARTICLE | May 8, 2021
Corrosion Evaluation and Corrosion Inhibitors Influence in the Furnace Internal Wall Tubes of the Refinery Boiler
Edori ES, Bekee D, Wecheonwu BC
Page no 20-26
This work evaluated the rate at which metal walls of the tubes of the furnace internal tubes of the refinery boiler were corroded due to the harsh environment in which it is operated. The rate of corrosion was investigated in the absence and presence of corrosion inhibitors with the use of a material balance equation of the boiler system where a mathematical model was derived using first order differential equation. The results obtained during the four years period under review were between 0.1425-0.5550mm, 0.1250-0.5000mm, 0.1125-0.4650mm, 0.2250-0.8000mm and 0.1700-0.6000mm in the absence of corrosion inhibitors in the FWT, EWT, IWT, ITURB AND ETURB respectively. The results also revealed that in the presence of corrosion inhibitors under the same period were 0.0945-0.2345mm, 0.0860-0.2135mm, 0.0775-0.1920mm, 0.1375-0.3415mm and 0.1035-0.2560mm in the FWT, EWT, IWT, ITURB AND ETURB respectively. The metals gained during the period under evaluation ranged between 0.0480-0.3205mm, 0.0490-0.2865mm, 0.0350-0.2730mm, 0.0875-0.4585mm and 0.0665-0.3440mm in the FWT, EWT, IWT, ITURB AND ETURB respectively. The resultant percentage efficiencies recorded during the period under review were in the range of 33.68-57.75%, 36.30-57.30%, 31.11-58.71% 38.89-57.31% and 39.12-57.33% in the FWT, EWT, IWT, ITURB AND ETURB respectively. The corrosion evaluation in the furnace internal wall tubes showed that there was a remarkable decrease in corrosion rate due to the application of corrosion inhibitors.
REVIEW ARTICLE | May 20, 2021
The Study of Relationship between Properties and Current & Various Resistance on Simulation in Motor Stalled with Series Circuit
Page no 27-29
The relationship between torque and current & various resistance is important in motor so in this study the motor properties is searched and find it can increase with current in different conditions which includes voltage, resistance of armature and times. The torque can increase with the current increasing. In terms of increasing the time to 140s the torque will increase certain. The maximum torque is 0.5Nm which is under condition of U=18V, Rm=8.5Ω& t=60s with armature radius of 5mm and its mass of 5.7g. The effective turn is U>Rm>t which expresses the prior factor among these three parameters.
REVIEW ARTICLE | May 22, 2021
Chemical Safety Awareness for Undergraduate Analytical Chemistry Students: A Case Study at Baghdad University, Republic of Iraq
Dr. Khalid S. Ziara, Dr. A. K. Ibraheem, Ammar Al-Furaiji
Page no 30-35
The objective of this study was to assess the chemical safety awareness for undergraduate analytical chemistry students. Data were collected from years one (First year) and four (final year) students in February 2018 using structured questionnaires (Multiple choices) designed for this purpose with chemical safety in mind, e.g. hazard warning symbols (signs), first aid, Material Safety Data Sheets (MSDS), waste handling and the use of safety equipment. The results of the study revealed that year four students have an average grade of below average (%51.1) which is significantly low and not encouraging compare to year one students who have an average grade of good (%79.2). Results of this study also showed that there isn’t much noticeable difference between female students' average grades than their male colleagues. Based on the results of this study, researchers recommend that year four student should get some sort of chemical safety training or asked to complete a chemical safety course prior to their graduation in order to avoid the possible happening of chemical accidents on them, their future work colleagues' and the environment.
REVIEW ARTICLE | May 22, 2021
The Modelling between Force & Torque and Crank Angle on Crank Linkage of Engine in Vehicle by Lagrange Formula I
Page no 36-39
The torque will be big according to the differantial to crank in crank and linkage mechanism by Lagrange formula. That may be fitted to the stroke ratio well. The bigger the one is the bigger the torque is. The crank force is the biggest in this study. The linkage force may incline as the crank mass and linkage length is big. The torque will be big when the stroke ratio is big and the crank mass is inclining on the crank linkage mechanism in vehicle. The force and torque effective turn is Crank angle q3 > linkage angle q2 > piston angle q1>piston displacement s. The torque turn in one status is piston M1> crank M3>linkage M2.
REVIEW ARTICLE | May 29, 2021
Nanoparticle: Role in Chemical Industries, Potential Sources and Chemical Catalysis Applications
Sanwal Piracha, Sadia Saleem, Momil, Gulzaib Basharat, Areeba Anjum, Zobia Yaseen, Sadia Saleem
Page no 40-45
Polymers are produced in chemical industries and changes can be made in their structure through nanotechnology to use them for other chemical applications and industrial processes. Nanotechnology is used for the synthesis of chemical compounds in chemical industries that are used for the synthesis of electricity in cheap ways. Chemical industries synthesized the useful products and chemical compounds with high costs and larger amount of energy required for their production. Different types of nanoparticles such as silver, golden and green synthesis have been made process in these days. This approach for engineering based for nanoparticles utilized for different types of ceramics and spectroscopy. The use of engineered Nano fibers already makes clothes water- and stain-repellent or wrinkle-free. Nanoparticles are used as a coating to improve the smoothness and heat resistance of common household equipment such as the flat iron. Catalysis in combination of nanotechnology has become the most industrial trend to accelerate the reactions at different sectors at low cost and high quality final product. Different approaches are used using nanotechnology to improve the chemical techniques to improve their strength and working capacity.