An-Najah National University

About: An-Najah National University is a education organization based out in Nablus, Palestinian Territory. It is known for research contribution in the topics: Population & Adsorption. The organization has 1857 authors who have published 2607 publications receiving 68226 citations. The organization is also known as: An Najah National University.

Aqueous extracts of olive roots, stems, and leaves as eco-friendly corrosion inhibitor for steel in 1 MHCl medium

Abstract: This work is devoted to examine the effectiveness of the aqueous extracts of olive (Olea europaea L.) leaves, roots, and stems on corrosion of mild steel in 1 M HCl solution using the weight loss measurement at various temperature and concentration effects. Polarization curves and electrochemical impedance spectroscopy (EIS) methods were employed to evaluate corrosion rate and inhibition efficiency. Corrosion inhibition efficiencies of 89.24, 88.84, and 89.83 % were achieved in 1 M HCl for olive root extract (ORE), olive stem extract (OSE), and olive leaf extract (OLE), respectively. It was found that the different extracts act as a good corrosion inhibitor for the tested system. The inhibitive action of the extract is discussed with a view to the adsorption of its components onto the steel surface which made a barrier to mass and charge transfer. The adsorption of extract components onto the steel surface was found to be a spontaneous process and increases the activation energy of the corrosion process. The inhibition efficiency is greatly reduced as the temperature increased. Experimental results show that corrosion inhibition efficiency increases with concentration of the sample extract. Polarization studies show that olive leaf, root, and stem extracts act as a mixed inhibitor.

CR-39 detector compared with Kodalpha film type (LR115) in terms of radon concentration

Abstract: CR-39 detectors and Kodalpha film type (LR115) were compared in terms of radon radiation concentration. Thirteen CR-39 detectors with the same number of Kodalpha film type (LR115) were used in this study. The correlation factor between the radon concentrations, obtained by the two groups of detectors was found to be 0.99. Detector time efficiency (DTE) was calculated for both types of detectors. DTE of Kodalpha film is larger than that of CR-39 detector and this indicates that LR115 is more efficient and sensitive for radon radiation than CR-39 detector.

Removal of cadmium from polluted water using decaying leaves : Effects of type of leaves and of concentration of cadmium

Abstract: The removal of cadmium from aqueous solutions by reed leaves, cypress leaves oak leaves, pine leaves and reed roots has been studied. Reed leaves have been found efficient for removing cadmium from aqueous solutions. Almost all of the cadmium present in solutions having concentrations ranging between 1 mg/L and 6 mg/L was removed by reed leaves within few days. Pine leaves and reed roots showed only little capability for removing cadmium from aqueous solutions. The results obtained on reed leaves were found to follow the Freundlich adsorption isotherm.

The Hidden Shadow of Coronavirus on Education in Developing Countries

Abstract: The aim of this paper is to investigate the challenges associated with emergency remote teaching in the developing countries of Palestine, Libya, and Afghanistan, as reported by middle-school students, their parents, and teachers. These countries have been struggling with an unstable and violent situation for decades. Semi-structured interviews were conducted with 60 participants from the three countries and 60 online classes were observed. Findings revealed that COVID-19 widened the digital gap among students and families, which created challenges in terms of online class attendance. In addition, violation of students’ and parents’ digital privacy emerged as another key challenge to emergency remote teaching. However, teacher presence and timely feedback in synchronous online sessions strengthened students’ engagement within the emergency remote teaching environment. Overall, emergency remote teaching during the COVID-19 crisis deepened inequities across students and infringed upon the digital ethics of students, teachers, and parents.