جعفری, محمد جواد
علوم پزشکی شهید بهشتی ، تهران ایران
[ 1 ] - پروتکل ثبت سیگنال های مغزی در نمونه های انسانی: مطالعات نوروارگونومی
Cognitive activities and the operation of tasks in the workplaces lead to the creation of a cognitive workload and specifically mental workload employee in the work environment. In order to measure these cognitive variables, physiological parameters are used. Electroencephalography is a non-invasive and relatively inexpensive method that can be used to evaluate neurophysiology and cogniti...
[ 2 ] - بررسی کارآیی حذف فتوکاتالیستی بخار تولوئن در بستر زئولیت Y آغشته به نانو ذرات دی اکسید تیتانیوم
Background and aims: With the increasing air pollution to volatile organic compounds, in critical demand of a new environmentally, friendly technologies to remove these contaminants from the air stream is of interest to everyone. Photocatalytic processes, including processes, are considered, radiation may be in the future as a new and promising technology used for the removal ...
[ 3 ] - اثر تعداد نازل، تراکم گاز آمونیاک و فشار مایع شستشو دهنده آب بر کارایی حذف گاز آمونیاک در هوا در یک برج پاشنده
Background and aims: Spray tower is a cost effective and simple equipment for ammonia gas purification. But its’ appropriate performance in the removal of ammonia gas is under question. In this study, the effect of nozzle number, concentration of input ammonia gas and scrubbing liquid pressure over the removal efficiency of spray tower was studied. Methods: In present study, a spra...
[ 4 ] - اعتبارسنجی تجربی یک نرم‌افزار طراحی تهویه موضعی
Background and aims: The application of computer codes and numerical modeling in studies and industry is growing. When using computer codes, the accuracy of these encodings and modelings are big questions. Comparing the results of the software with experimental results is the best method of evaluating these programs. The objective of this study was to experimentally validate a software program ...
[ 5 ] - نقش مدلسازی و ارزیابی پیامد در بهبود سطح ایمنی تاسیسات مخاطره‌آمیزصنعتی ( مطالعه موردی: واحد تولید هیدروژن )
Background and aims: One of the most essential and important steps for improving safety level in existing or designing units is consequence evaluation of hazards such as fire, explosion and dispersion of hazardous chemical substances. Due to severe operational conditions, high explosive and flammable gases such as methane and hydrogen, hydrogen production process is causing major industrial a...
[ 6 ] - پیش‌بینی و تحلیل خطای انسانی اپراتورهای اتاق کنترل پست‌های 400 کیلو‌ولت و اثر بخشی راه‌کارهای پیشنهادی
Background and Aims: Human being as the designer, programmer, and operator of systems, equipment and machineries plays a significant role in their safety at present time. In a sophisticated system, the operators’ behavior has the potential of errors that can influence the capability of the system. In the present study, human errors of 400 kV posts were identified, analyzed and their reduction...
[ 7 ] - بررسی اثر صدای کم فرکانس بر عملکرد ذهنی در حین انجام محاسبات ریاضی
Background and aims The influences of Low Frequency Noise (LFN) on mental performance have been the objectives of many papers in recent years. Many researchers believe that the LFN even at low pressure levels has impacts on mental performance. In the present work the influences of LFN and Reference Noise (RN) at two different sound pressure levels (45 & 65 dBA) on mental performances of co...
[ 8 ] - بررسی تأثیر آنالیز ایمنی شغلی بر درک کارگران از ریسکهای شغلی در مشاغل پرمخاطره یک پالایشگاه
Background and aimsRisk perception is a key parameter influencing the behavior of theworkers at workplace. The present work contributes to study the effect of Job Safety Analysis(JSA) on risk perception of the high risk jobs in a refinery complex.MethodsFive high risk jobs were identified using "Drop off" method in a refinery complex.Risk perception was evaluated using a standard questionnaire....
[ 9 ] - بررسی ارتباط بین شاخص استرس محیطی و برخی پارامترهای فیزیولوژیکی بدن کارگران در یک معدن روباز
Introduction: In many industrial and mining environments, heat stress not only leads to a lower productivity and poor morale, but also it increases the cost of accidents. Heat stress indices have been developed to assess heat stress at workplace. The objective of this study was to evaluate heat stress and to investigate the correlation between ESI index and some physiological parameters of work...
[ 10 ] - تاثیر تهویه بر تراکم آلاینده‌های بیولوژیک هوا در یک اتاق بیمار مسلول
Background: Ventilation plays a crucial role in reducing the number of air transmitted pathogens in isolated rooms. Determination of the suitable type of ventilation system and the proper ventilating rate has always been a challenge. Patients’ bed arrangement and the location of the staff are also expected to influence the occupational exposure of the staffs’ to harmful airborne particles. The...
[ 11 ] - مقایسه میزان حذف آمونیاک از هوا توسط شستشو‌دهنده تر پر شده با حلقه‌های راشیگ سرامیکی و پی وی سی
Background: Different packing materials are used in wet scrubbers that each one has its own advantages and limitations. Common ceramic packing materials have high removal efficiency but they are heavy, fragile and high head loss along the bed. Finding a suitable replacement for these materials has always been concerned by researchers. The objective of the present study was to compare the ...
[ 12 ] - جذب شیمیایی آمونیاک از هوا در یک ستون پرشده
زمینه و هدف: برای شستشوی آمونیاک از جریان هوا روش‌های متعددی در دسترس است. به نظر می‌رسد شستشوی اسیدی با استفاده از ستون پرشده موفقیتآمیزتر از سایر روش‌ها باشد. در این تحقیق امکان حذف گاز آمونیاک با استفاده از مایع شستشوی اسیدی توسط یک ستون پرشده مورد بررسی قرار گرفت. روش کار: ستون پرشده‌ای به قطر 20 سانتی متر تا ارتفاع 30 سانتی‌متر توسط حلقه‌های راشیگ سرامیکی به صورت انباشته (تصادفی) پر شد. ج...
[ 13 ] - Mental workload and affecting factors among firefighters in Tehran, Iran, in 2017
Background: Firefighting and rescue require high physical and psychological needs under unpredictable and dangerous conditions. Thus, this study aimed to investigate mental workload and affecting factors in firefighters. Materials and Methods: This is a descriptive study which was conducted on 250 firefighters of Tehran, Iran. National Aeronautics and Space Administration Task Load Index (NASA...
[ 14 ] - طراحی سیستم ارزیابی و گزارش‌دهی عمل کرد پایدار شهرداری کلان‌شهرها مطالعه موردی: عمل کرد سلامت شهرداری تهران
Introduction: The responsibility of achieving sustainable development goals in most megacities and subsequently in Tehran megacity are in charge of the municipalities. Since, the goal of municipalities in environmental-friendly activities is to protect the physical and mental health of citizens. Therefore, the sustainability assessment of health performance in municipalities is one of the most ...
[ 15 ] - شناسایی و رتبه بندی شاخص های رزیلینس سازمانی مجتمع های پالایشگاهی با استفاده از روش تاپسیس فازی
Introduction: Resilience engineering is a novel approache to risk management and is the inherent ability of a system to adapt their work before, during and after the changes and adverse events in such a way that maintain the system performance under predictable and unpredictable conditions. The aim of this study was to identify indicators of organizational resilience of refineries and ranking t...
[ 16 ] - بررسی عملکردهای شناختی دانشجویان در مواجهه با صدا با استفاده از آزمون عملکرد پیوسته
Introduction: In the most industrial environment, workers are exposed to noise everyday. Exposure to this physical hazardous agent can cause immediate as well as delayed adverse effects. Cognitive performance decrement is one of the adverse effects of noise exposure which its main consequences is occupational accidents. This study attempted examine the effect of exposure to different levels of ...
[ 17 ] - بررسی وضعیت ایمنی راه‌های کشور طی سال‌های 1380 الی 1385
Introduction: In developing countries, promotion of road safety is of crucial importance. This paper presents the status of road safety in Iran during 2001 - 2006. . Material and Method: The status of road safety in Iran was surveyed in this descriptive study using road safety indicators a in macro level. Firstly, 46 indicators were identified after studying almost all indicators related to th...
[ 18 ] - رابطه میزان رضایتمندی شغلی پرستاران یک بیمارستان با وضعیت ایمنی و بهداشت حرفه‌ای در آن
Introduction: Job satisfaction of nurses hasalwaysbeenconcernedin hospitals. It influences the quality of services offered by the nurses. Many nurses leave their job mainly due to the lack ofjob satisfaction.Different factors including the health and safety at work influencejob satisfaction. Thisstudy aimed to evaluate the occupational safety and health status of Khorram Abad’s Shohada hospital...
[ 19 ] - 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...
[ 20 ] - The analysis of hazard identification and risk assessment studies with the approach to assessing risk control measures since 2001 to 2017: A systemic review
Abstract background and aims: Nowadays the growing complexity of technology and industry has led to vast changes over the last few decades. These changes, in addition to their positive and valuable effects, have also caused industrial accidents affecting human life and the environment. According to the ILO 2011 report, there are 340 million annual workplace accidents and 160 million occupation...
[ 21 ] - The Effects of Noise and Whole Body Vibration on Urinary Metanephrine and Normetanephrine
Background and Aim: Little attention has been paid to the effects of combined exposure to noise and vibration. Exposure to noise and vibration can effect stress hormones and may lead to high blood pressure and cardiovascular disorders. This study aims to investigate the effects of noise and vibration on urinary Metanephrine and Normetanephrine among men. Methods: In this experimental study, 30 ...
[ 22 ] - Design and Construction of an Aerosol Particle Classification System Based on Electrical Mobility
Introduction: The application of particles’ electrical mobility in the electric field has always been an important concern, as the functional basis of a number of particle measuring and classification instrumentations. The objective of this study was to design and construct an aerosol particles classification system using electrical mobility feature in laboratory scale. Methodology: This labo...
[ 23 ] - Investigating the Effect of Exposure to Whole Body Vibration on Mental Performances of 20-29 Years Old Male
Background and Aim: Vibration, especially whole body vibration, is one of the most important physical harmful factors in industrial environments as well as vehicles. Exposure to whole-body vibration can cause different mental and physiological reactions in humans. This study aimed to investigate the effect of exposure to whole body vibration on the mental performances of 20-29 years old males i...
[ 24 ] - Determination of Aerosol Particle Size Distribution using Electrical Differential Mobility Analyzer (DMA)
Introduction: Determining the size distribution of the particles for assessing their effects on human health and their control mechanisms is very effective. One of the most important equipment used in determining particle size distribution is the DMA. In this study, in addition to the design and construction of a DMA, the size distribution measurement of aerosol particles was carried out. Mate...
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