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- 저자 : Hossein Kakooei (검색결과 4 건)
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Risk Assessment of Exposure to Silica Dust in Building Demolition Sites
Normohammadi, Mohammad,Kakooei, Hossein,Omidi, Leila,Yari, Saeed,Alimi, Rasul Occupational Safety and Health Research Institute 2016 Safety and health at work Vol.7 No.3
Background: Building demolition can lead to emission of dust into the environment. Exposure to silica dust may be considered as an important hazard in these sites. The objectives of this research were to determine the amount of workers' exposure to crystalline silica dust and assess the relative risk of silicosis and the excess lifetime risk of mortality from lung cancer in demolition workers. Methods: Four sites in the Tehran megacity region were selected. Silica dust was collected using the National Institute for Occupational Safety and Health method 7601 and determined spectrophotometrically. The Mannetje et al and Rice et al models were chosen to examine the rate of silicosis-related mortality and the excess lifetime risk of mortality from lung cancer, respectively. Results: The amount of demolition workers' exposure was in the range of $0.085-0.185mg/m^3$. The range of relative risk of silicosis related mortality was increased from 1 in the workers with the lowest exposure level to 22.64/1,000 in the employees with high exposure level. The range of the excess lifetime risk of mortality from lung cancer was in the range of 32-60/1,000 exposed workers. Conclusion: Geometric and arithmetic mean of exposure was higher than threshold limit value for silica dust in all demolition sites. The risk of silicosis mortality for many demolition workers was higher than 1/1,000 (unacceptable level of risk). Estimating the lifetime lung cancer mortality showed a higher risk of mortality from lung cancer in building demolition workers.
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Risk Assessment of Exposure to Silica Dust in Building Demolition Sites
Mohammad Normohammadi,Hossein Kakooei,Leila Omidi,Saeed Yari,Rasul Alimi 한국산업안전보건공단 산업안전보건연구원 2016 Safety and health at work Vol.7 No.3
Background: Building demolition can lead to emission of dust into the environment. Exposure to silica dust may be considered as an important hazard in these sites. The objectives of this research were to determine the amount of workers’ exposure to crystalline silica dust and assess the relative risk of silicosis and the excess lifetime risk of mortality from lung cancer in demolition workers. Methods: Four sites in the Tehran megacity region were selected. Silica dust was collected using the National Institute for Occupational Safety and Health method 7601 and determined spectrophotometrically. The Mannetje et al and Rice et al models were chosen to examine the rate of silicosis-related mortality and the excess lifetime risk of mortality from lung cancer, respectively. Results: The amount of demolition workers’ exposure was in the range of 0.085-0.185 mg/m3. The range of relative risk of silicosis related mortality was increased from 1 in the workers with the lowest exposure level to 22.64/1,000 in the employees with high exposure level. The range of the excess lifetime risk of mortality from lung cancer was in the range of 32-60/1,000 exposed workers. Conclusion: Geometric and arithmetic mean of exposure was higher than threshold limit value for silica dust in all demolition sites. The risk of silicosis mortality for many demolition workers was higher than 1/ 1,000 (unacceptable level of risk). Estimating the lifetime lung cancer mortality showed a higher risk of mortality from lung cancer in building demolition workers.
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Shahla Kakoei,Amir Hossein Nekouei,Sina Kakooei,Hamid Najafipour 한국역학회 2021 Epidemiology and Health Vol.43 No.-
developOBJECTIVES: The effect of age, sex, and other demographic factors on the relationship between smoking and dry mouth remains unknown. The aim of this study was to investigate the effects of demographic characteristics on the relationship between dry mouth, also known as xerostomia, and smoking. METHODS: This case-control study included 5,640 randomly-selected subjects from the second phase of the Kerman Coronary Artery Disease Risk Factors Study, which observed 10,000 participants from 2014 to 2018. A checklist was used to record the participants’ demographic characteristics and smoking frequency. Each participant completed a six-item Fox questionnaire to measure dry mouth as a dependent variable. The interaction terms of daily cigarette smoking with sex, age, educational level, and marital status were entered into the model. Non-significant terms were removed using hierarchical model selection. RESULTS: Of the sample, 3,429 (60.8%) did not have dry mouth and were analyzed as controls, whereas 2,211 (39.2%) had xerostomia and were deemed to be cases. Smokers were more likely to have dry mouth in all ages and both sexes (p < 0.001). As male became older, the chance of having dry mouth increased more rapidly than among female smokers (p < 0.001). In addition, female smokers were more likely to have dry mouth than male smokers (p < 0.001). CONCLUSIONS: The likelihood of dry mouth among daily smokers depended on age and sex. Female smokers were more likely to have dry mouth, and its likelihood increased with age in daily smokers of both sexes, though more rapidly in males.
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Mohammad Hajaghazadeh,Vincenzo Vaiano,Diana Sannino,Hossein Kakooei,Rahmat Sotudeh-Gharebagh 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The effect of operating parameters on gas phase photocatalytic oxidation of methyl ethyl ketone (MEK) hasbeen investigated over P25 and PC500 photocatalysts. The parameters were gas flow rate, relative humidity (RH), reactiontemperature, and ultraviolet intensity. The photoreactor was composed of two LEDs matrices and a fluidized bedreactor (LED-FBR). No mass transfer limitation phenomena occurred at flow rates in the range 30-70 NL/h. The oxidationof MEK over the two photocatalysts did not highly depend on the presence or absence of humidity in the airstream. Temperature was determined as an important parameter in conversion of MEK over 60 to 120 oC, influencingalso the selectivity to carbon dioxide and carbon monoxide. The simultaneous influence of RH and temperature wasobserved in the reaction at different temperatures and RHs, evidencing the decrease in the selectivity towards CO withincrease of RH. With the increase of ultraviolet intensity, the rate of MEK oxidation increased over both catalysts, withthe better activity of PC500 than P25 particularly at higher light intensities. The main effect of temperature was both topromote the MEK conversion and to limit the competitive water adsorption in the PCO reaction over the tested titanias.
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