Showing 3 results for Fathi
P Baratpour, G Moussavi, A Alahabadi, E Fathi, S Shekoohiyan,
Volume 10, Issue 2 (9-2017)
Abstract
Background and Objective: With industrial development and population growth, the emerging contaminants enter into the natural water resources. Therefore, adsorption potential of Ammonium Chloride-induced activated carbon (NAC) to remove metolachlor pesticide from contaminated water was investigated in this study.
Materials and Methods: The effects of operational conditions including solution pH, NAC concentration, metolachlor initial concentration and contact time on the removal of metolachlor by Ammonium Chloride-induced activated carbon (NAC) and standard activated carbon (SAC) were studied.
Results: Over 92.4% of 50 mg/L metolachlor was adsorbed using 0.3 g NAC/L within 5 min, and by increasing the reaction time to 60 min the removal efficiency reached to 100%. Under similar experimental conditions, standard activated carbon (SAC) could only adsorb 20% of metolachlor within 5 min and increase of contact time to 40 min caused the improvement of metolachlor adsorption onto SAC to 48%. The adsorption onto SAC was not influenced by the contact time over 40 min. Kinetic analysis showed that experimental adsorption data for both NAC and SAC were best fitted to the pseudo-second-order model. The maximum adsorption capacities of metolachlor onto NAC and SAC calculated by the Langmuir model were 344.8 and 238.1 mg/g, respectively.
Conclusion: Generally, these results showed that developed NAC was an efficient adsorbent with high removal efficiency for eliminating the halogenated pesticides from the contaminated water streams.
Ensiyeh Norozi, Farideh Fathinejad, Fatemeh Salmani, Parisa Sadighara, Tayebeh Zeinali,
Volume 16, Issue 1 (6-2023)
Abstract
Background and Objective: The purpose of this study is to evaluate the difference in knowledge, attitude, and performance in terms of food hygiene and safety between people with and without a history of Covid-19.
Materials and Methods: This descriptive-analytical study was conducted on 712 people from August to September 2021 using a standard online questionnaire. The questionnaire had four sections, the first section includes demographic information, the second section includes seven questions related to participants' knowledge about food hygiene and safety, the third section includes ten questions about participants' attitudes, and the fourth section contains 10 questions related to participants' health performance. Multiple regression models were used to investigate the main predictors of knowledge, attitude, and performance. The significance level was considered as p < 0.05.
Results: There were 271 (43%) people with a history of infection and 361 (57%) without infection. Demographic factors were not significantly different between people with and without a history of infection. The results of the present study showed that knowledge (p=0.05) and people's performance (p=0.002) about food hygiene and safety have a significant relationship with the history of corona infection. However, people's attitude was not affected by the corona infection (p=0.17). Attitude was the major predictor of performance (p <0.001).
Conclusion: It can be claimed that contracting Corona has increased people's knowledge and improved performance regarding food hygiene and safety during the Covid-19 pandemic and has improved health conditions.
Zahra Fathi Loshkani, Faezeh Mohammadi, Mohammad Mehdi Emamjomeh, Ahad Alizadeh, Azam Janati Esfahani,
Volume 19, Issue 1 (6-2026)
Abstract
Background and Objective: This study investigated the spatial distribution of electric and magnetic field intensities around 63 kV high-voltage power lines located in a public park in Qazvin, Iran. The aim was to evaluate citizens’ exposure to extremely low frequency (ELF) electromagnetic fields through experimental measurement and numerical modeling.
Materials and Methods: This descriptive-analytical research measured electric and magnetic field strengths around 63 kV pylons in four directions and various distances at typical human height (170 cm) across all seasons. Measurements were conducted using a calibrated Holaday field meter during peak power consumption periods. Three-dimensional field propagation was modeled using the COMSOL Multiphysics software and the finite element method (FEM). The obtained data were compared to Iranian national exposure standards and analyzed statistically using R software and the generalized estimating equation (GEE) model.
Results: The intensities of both electric and magnetic fields were highest near the pylons and decreased with increasing distance. The maximum electric field values occurred in spring and summer, while magnetic field maxima appeared in winter. Temperature and humidity exhibited significant effects on the field intensities (p< 0.05). Modeled values were higher than measured ones. Nevertheless, all measured values were below the permissible limits defined by Iranian national standards.
Conclusion: The exposure level of visitors to electromagnetic fields within the studied park was found to be within safe limits and below the national health thresholds. Considering seasonal variations and environmental influences, periodic monitoring throughout the year is recommended. Utilization of natural elements such as vegetation can effectively reduce local field exposure.
