نتایج جستجو برای: air concentration
تعداد نتایج: 571319 فیلتر نتایج به سال:
background: air pollution and concerns about health impacts have been raised in metropolitan cities like tehran. trend and prediction of air pollutants can show the effectiveness of strategies for the management and control of air pollution. artificial neural network (ann) technique is widely used as a reliable method for modeling of air pollutants in urban areas. therefore, the aim of current ...
background: human hair can be used as an inexpensive and accessible adsorbent to remove a variety of pollutants from air. although several studies have been done on removal of formaldehyde from wastewater by human hair, to date no study has investigated using hair to remove formaldehyde from air. therefore, the aim of this study was to remove formaldehyde from synthetic contaminated air by a re...
Introduction and purpose: Formaldehyde is used as a disinfectant and preservative for preserving the mummy’s body. The compound is classified by the International Agency for Research on Cancer in the Human Cancer Group. This study aimed to investigate the rate of exposure to formaldehyde vapors in an anatomy hall and its relationship with environmental factors. Methods: This descriptive study ...
Introduction Hundreds of millions of patients are affected by nosocomial infections worldwide each year, leading to significant mortality and financial losses for health systems. Maintenance of adequate indoor air quality Air (IAQ) at hospitals is critical to the prevention of these infections. Evaluation of IAQ can be performed by bioaerosol sampling and particle counting. The current study a...
An Experimental Study of Nanofluids Operated Shell and Tube Heat Exchanger with Air Bubble Injection
Shell and Tube heat exchangers are the heat exchangers that are most widely used in industries and for other commercial purposes. There are many techniques that have been utilized to enhance the heat transfer performance of the shell and tube heat exchangers. Air bubble injection is one of the promising and inexpensive techniques that can create turbulence in the fluids resulting in to enhancem...
Background and purpose: Biological pollution in indoor air is mostly created through bacteria and fungi which are harmful to human health. In the present study we evaluated the fungal diversity of air and air-conditioning systems in different schools of Mazandaran University of Medical Sciences. Materials and methods: The samples were collected from some rooms in different schools of Mazanda...
OBJECTIVE To evaluate the relative contribution of occupational vs. non-occupational secondhand tobacco smoke exposure to overall hair nicotine concentrations in non-smoking bar and restaurant employees. METHOD We recruited 76 non-smoking employees from venues that allowed smoking (n=9), had mixed policies (smoking and non-smoking areas, n=13) or were smoke-free (n=2) between April and August...
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