AJCE_Vol 03 N 01
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Item Thermally integrated microchannel methanol steam reforming reactors for hydrogen production(University of Eloued جامعة الوادي, 2022-02-17) Junjie ,ChenThermally integrated microchannel reforming reactors have attracted considerable interest for a wide variety of applications. However, the mechanisms for the effects of design factors on heat transfer characteristics are still not fully understood. The present study relates to a thermochemical process for producing hydrogen by the catalytic endothermic reaction of methanol with steam in a thermally integrated microchannel reforming reactor. Numerical simulations are conducted using computational fluid dynamics to understand the consumption, generation, and exchange of thermal energy between endothermic and exothermic processes in the reactor. The effects of wall heat conduction properties and channel dimensions on heat transfer characteristics and reactor performance are investigated. Thermodynamic analysis is performed based on specific enthalpy to better understand the evolution of thermal energy in the reactor. The results indicate that the thermal conductivity of the channel walls is fundamentally important. Materials with high thermal conductivity are preferred for the channel walls. Thermally conductive ceramics and metals are well-suited. Wall materials with poor heat conduction properties degrade the reactor performance. Reaction heat flux profiles are considerably affected by channel dimensions. The peak reaction heat flux increases with the channel dimensions while maintaining the flow rates. The change in specific enthalpy is positive for the exothermic reaction and negative for the endothermic reaction. The change in specific sensible enthalpy is always positive. Design recommendations are made to improve thermal performance for the reactor.Item Theoretical Evaluation of the Potency of some Tetracycline Molecules as Anti-Brucella Agents: DFT and Molecular Docking Approaches(University of Eloued جامعة الوادي, 2022-06-04) Dayo ,Felix LATONA -Oyeronke ,Damilola EESUO-Brucellosis is caused by an intracellar pathogens known as Brucella. It is a zoonotic disease that causes renal and cardiac failures in human beings and tetracycline is one of the prominent antibiotics employed as anti-brucella agent. In this research, molecular docking of some tetracycline molecules against Brucellosis protease was reported. In order to analyse the reactivities of the tetracycline molecules in vacuum and solvent phases, DFT reactivity descriptors of five Tetracycline molecules as anti-brucellosis at the B3LYP/6–311++G(d,p) level of theory was investigated. The inhibition based on the binding affinity values showed that inhibition was in the order: Anhydrotetracycline >Metatetracycline > Oxytetracycline > Tetracycline > Chlorotetracycline. Therefore, among the five tetracycline molecules studied, Anhydrotetrcycline is the most effective antibiotics for combating Brucellosis.Item Synthesis and evaluation of antimicrobial activity of two Schiff bases derived from cyclohexylamine(University of Eloued جامعة الوادي, 2022-01-01) A, A. Ahmed-U, M. Kuramaa-U, S. Buba -I, M. WakilDesign and development of novel materials with outstanding antimicrobial properties has transpired to hinder and regulate the growth of microorganisms. Indubitably, Schiff bases are the magic bullet that have efficient antimicrobial properties against various pathogenic strains. The Schiff bases, L1 and L2 reported herein were respectively synthesized by equimolar condensation of benzophenone with cyclohexylamine and 2,4-dihydroxybenzophenone with cyclohexylamine. The products were obtained in excellent yield of 66 and 75 %. The Schiff bases were subjected to solubility test, melting point determination and FT-IR spectroscopic analysis. They were found to show relative thermal stability with melting points of 220 and 195 oC and solubility in methanol, acetone and dimethylformamide of the solvents used. The FT-IR confirmed the formation of the Schiff bases with appearance of azomethine (C=N) peak at 1652 and 1592 cm-1. The in vitro antimicrobial activity of the Schiff bases was tested against two gram positive bacteria (Staphylococcus aureus and Streptococcus pyogens) and two gram negative (Pseudomonas aureginosa and Escherichia coli) as well as two fungi strains (Aspergillus niger and Candida albicans). The results reveal that the Schiff base L2 shows promising activity against all the pathogen under investigation. However, no activity was observed for L1 against the microbes except Streptococcus pyogens