The effect of stem Extract of Brahmi (Bacopamonnieri) and Henna on the rate of corrosion of low carbon steel were investigated in a solution of 0.5 M NaOH using the methods of weight loss measurements and potentiodynamic polarization. The findings revealed that the dual effect of stem extract had the role of being an effective inhibitor, the loss of weight experiments and the inhibition efficiencies gained from the polarization process were well matched. It was proved by conducting the potentiodynamic polarization method that the stem extract is an inhibitor of mixed type in an alkaline solution of 0.5 NaOH for low carbon steel through avoiding the reactions of both cathodic and anodic on a metal surface. Thus, the findings gained from the experiment of weight loss reveals the same effect of corrosion’s inhibitions, the results show that when using different concentration of extract of Brahimi (Bacopamonnieri) and Henna solutions ranging between (0.5–2)% in 0.5 M NaOH at room temperature and 1 atm, the efficiency IEp % increased up to 80% which is resulting from polarization while the efficiency IE% increased up to 65% which is resulting from weight loss method.

Background: Coronavirus 2019 (COVID-19) pandemic led to a massive global socio-economic tragedy that has impacted the ecosystem. This paper aims to contextualize urban and rural environmental situations during the COVID-19 pandemic in the Middle East and North Africa (MENA) Region. Results: An online survey was conducted, 6770 participants were included in the final analysis, and 64% were females. The majority of the participants were urban citizens (74%). Over 50% of the urban residents significantly (p < 0.001) reported a reduction in noise, gathering in tourist areas, and gathering in malls and restaurants. Concerning the pollutants, most urban and rural areas have reported an increase in masks thrown in streets (69.49% vs. 73.22%, resp.; p = 0.003). Plastic bags and hospital waste also increased significantly with the same p-value of < 0.001 in urban areas compared with rural ones. The multifactorial logistic model for urban resident predictors achieved acceptable discrimination (AUROC = 0.633) according to age, crowdedness, noise and few pollutants. Conclusion: The COVID-19 pandemic had a beneficial impact on the environment and at the same time, various challenges regarding plastic and medical wastes are rising which requires environmental interventions.

Initial unit cell models of polyvinyl chloride(PVC)/high dnsity polyethylene (HDPE) composites and pure polyvinyl chloride were built using materials Studio, the stiffness matrix and mechanical parameters of the unit cells were achieved by molecular dynamic optimizations and calculations. Finally, the mechanical properties of pure PVC and the PVC/HDPE composites were compared. The result shows that the mechanical properties of PVC can be remarkably reinforced by being filled with HDPE, where the addition of 9.5%high density poly ethylene (HDPE) to poly vinyl chloride (PVC) the mechanical properties improved and the density degreases slightly.

This study aimed to predict the mechanical properties of SiC-reinforced epoxy. The cross-linked reinforced epoxy was simulated using Material Studio 7.0 (Accelrys, Inc.). Various percentages of SiC (0, 4, 6, 8, and 10) wt% were used in the simulations. A density curve and cell size diagram are obtained from MD simulations of SiC-epoxy nanocomposites. Under a 0.5 GPa pressure, Forcite dynamic simulations showed that amorphous cells have densities that are close to epoxy density (1.2 g cm⁻³). Simulations have shown that epoxy/SiC composites respond well to a variety of mechanical strains. Increasing the SiC weight percentage increases the stiffness matrix coefficient of epoxy composites, which is demonstrated by increased stiffness matrix coefficients. Computational studies of epoxy/SiC composites have suggested up to 10% SiC nanoparticles by weight will maintain the epoxy matrix’s density in industrial applications.