فرهنگ دهقان, سمیه
دانشگاه علوم پزشکی تهران
[ 1 ] - ساخت و بهینه‌سازی نانوالیاف پلی آکریلونیتریل برای کاربرد در فیلتراسیون هوا
Background and aims: In nanofibrous filters, morphological properties, diameter of fibers and porosity percent of media are the most filtration characteristics. Therefore, the present study aimed to optimize the electrospinning parameters for reaching to the desired values of the mentioned filter characteristics. Method: For this purpose, a study design was prepared using response surface me...
[ 2 ] - Investigation of the Accidents Recorded at an Emergency Management Center Using the Pareto Chart: A Cross-Sectional Study in Gonabad, Iran, During 2014-2016
Background: This study investigated the accidents recorded at the Gonabad Hospital Management Center for Hospital Management from 2014 to 2016, and identified important causes or parameters that influenced the incidence of accidents using the Pareto chart. Materials and Methods: This descriptive and analytic study examined 25,414 incidents recorded at the Gonabad Hospital Management Center. Th...
[ 3 ] - ارزیابی مواجهه جوش‌کاران قوس الکتریکی با میدان مغناطیسی با فرکانس بی‌نهایت پایین: رابطه آن با میزان ترشح هورمون پاراتورمون و حالات خلقی
Introduction: Nowadays, exposure to extremely low frequency (ELF) magnetic field has been interested in many studies due to possible effects on human physical-mental health. Therefore, this study aimed to assess arc welders’ exposure to extremely low frequency magnetic field and to determine its relationship with the secretion of paratormone (PTH) hormone and mood states. Material and Method...
[ 4 ] - ریسک بهداشتی ناشی از مواجهه ارتعاش تمام بدن رانندگان لیفتراک در دو وضعیت دارای بار و بدون بار: مطالعه موردی در یک شرکت خودروسازی
Introduction: Fork-lifts are considered as one of the main sources of vibration at workplaces. Due to importance of the risks from exposure to vibration, the present study was aimed to investigate health risk due to exposure of fork-lift drivers to whole body vibration at two position with load and without load in an Automobile industry. Method: In this cross sectional study, the evaluation of...
[ 5 ] - Effect of occupational exposure to extremely low frequency electromagnetic fields on level of thyroid hormones effective on fatigue
Background: The aim of this study was to assess exposure to extremely low frequency electromagnetic fields (ELF-EMFs) and its effects on secretion of thyroid hormones associated with symptoms of fatigue on electric arc welding workers. Methods: This study was carried out on two groups including 35 welders (as exposed) and 35 non-welders (as control). Extremely low frequency electromagnetic fie...
[ 6 ] - Presentation of an Operational Program to Reduce vulnerability of outdoor workers to to heat stress and climate change
Background: Outdoor workers are vulnerable to heat stress and climate change due to their occupational and environmental conditions. Short-term exposure to extreme heat (acute exposure) can lead to rise the core body temperature, which it may directly cause heat related illnesses such as mild rash, cramps, heat exhaustion and heat stroke. It is reported that long-term chronic exposure to heat l...
[ 7 ] - Investigating the relationship between heat stress and workers’ blood parameters in a foundry
Background and Aim: Heat stress is one of the physical hazardous agents in the workplace with many adverse health effects. This study aimed to investigate the relationship between heat stress and workers' blood parameters in a foundry. Methods: This case-control study was conducted in July 2018 on 55 male subjects employed in Saipa Malleable foundry located in Tehran, Iran. The selected individ...
[ 8 ] - Effect of High Light Level on Sperm parameters in Mice
Background and aims: High light level of natural or artificial sources in some workplaces may be considered as a hazardous physical agent. The present study aimed to assess the effect of light level of 1000 lux on sperm parameters in mice. Methods: The subjects were assessed in two group including 1. Exposed (n= 6; exposed to light level of 1000 lux during 5 eight-hour days), 2. Unexposed ...
[ 9 ] - Production of Nanofibers Containing Magnesium Oxide Nanoparticles for the Purpose of Bioaerosol Removal
The present study aims at investigation of the performance of nanofibrous filter, containing magnesium oxide (MgO) nanoparticles, for bioaerosols removal from the air stream. It synthesizes two types of polyacrylonitrile (PAN) and PAN/MgO nanofibers via electrospinning technique, and investigates the antibacterial properties of the produced nanofibers through disk diffusion. The air containing ...
[ 10 ] - Production of Nanofibers Containing Magnesium Oxide Nanoparticles for the Purpose of Bioaerosol Removal
The present study aims at investigation of the performance of nanofibrous filter, containing magnesium oxide (MgO) nanoparticles, for bioaerosols removal from the air stream. It synthesizes two types of polyacrylonitrile (PAN) and PAN/MgO nanofibers via electrospinning technique, and investigates the antibacterial properties of the produced nanofibers through disk diffusion. The air containing ...
[ 11 ] - Effects of Co-Exposure to Noise and JP-4 Jet Fuel on Hearing Loss in Rats
Background and Aim: Autotoxic substances such as JP-4 jet fuel can have negative effects on the auditory system by the various means such as cochlear dysfunction. The purpose of this study was to investigate the combined effects of exposure to JP-4 jet fuel and noise on hearing loss in rats, to determine the possible interference effects of these two risk factors on rat auditory system. Methods...
[ 12 ] - COMPARISON OF FILTRATION PERFORMANCE BETWEEN NEAT AND PLASMA-TREATED PAN / MGO NANOFIBERS IN THE REMOVAL OF 10 TO 1000 NM PARTICLES
Introduction: The present study aimed to compare the filtration performance between neat hybrid electrospun nanofibers consisting of polyacrylonitrile (PAN) polymer and magnesium oxide (MgO) nanoparticles and plasma treated ones in removing fine particles from the air stream. Methodology: The upper surface of the nanofibers were processed by cold-plasma with a radio frequency power supply (13....
[ 13 ] - Assessment of Dust Holding Capacity of Nanofiber Media and Its Ability to Capture Synthetic Dust
Background and Aim: Evaluation of the performance of these products is mainly based on their efficiency in numerical removal of particles in the range of different sizes. While the most important features of filters are the dust holding capacity, and the ability to remove the mass of particles with different densities, fewer studies have addressed this issue. Therefore, the present study evalua...
[ 14 ] - Trend Analysis and Temporal and Spatial Distribution of Wet Bulb Globe Temperature as a Heat Stress Index in Iran during the Summer Season over a 30-Year Period
Introduction: Global warming is one of the most important environmental problems that have raised researchers’ attention. The present study aimed to analyze heat stress trends using the Wet Bulb Globe Temperature (WBGT) index in the country of Iran during the summer over a 30-year period. Materials and Methods: Daily summertime statistical data regarding mean temperature and mean relative humi...
نویسندگان همکار