Showing 4 results for Aghaei
H. Aghaei, H. Kakooei, S.j. Shahtaheri, F. Omidi, S. Arefian, K. Azam,
Volume 3, Issue 4 (2-2014)
Abstract
Introduction: PAHs are organic compounds with benzenic rings that releas from hot asphalt as incomplete combusting. These compounds are one of the major concern in scientific societies, workplace and environment due to their stability, bioaccumulation, carcinogenic and mutagenic effects. Since asphalt workers are exposed to PAHs frequently in their job, in this study it was attempted to evaluate respiratory exposure of asphalt workers to PAHs in their breathing zone.
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Material and Method: In this study air samples of the asphalt workers were collected in accordance with the NIOSH 5506 method using PTFE filter and XAD-2 adsorbent. The ultrasonic bath and acetonithrile are used in order to extract the analytes from the filter and adsorbent. Also, the samples were analyzed by HPLC-UV.
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Result: In all samples, Finisher assistance and oilman with 1754.48 ng/m3 , 24.65 ng/m3 had maximum and minimum exposed to ∑PAH, respectively. Among the PAHs compounds, which asphalt workers exposed to, Naphtalene had the highest concentration. Among different asphalt workers tasks, screedman expoused to PAHs, had a significant difference.
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Conclusion: Evaluation of Polycyclic aromatic hydrocarbons concentrations in the breathing zone of asphalt workers indicated that exposure to these compounds were below the occupational exposure limits recommended by NIOSH, OSAH, ACGIH and Iranian OEL. Due to the highly carcinogenic potential of some of these compounds and absence of occupational exposure limits for these compounds, likes Chrysene and Benzo (a) Anthracene, it is strictly recommended to employ engineering controls and using suitable PPEs. This study also indicated that the exposure to PAHs in the most asphalt workers tasks had significant differences, and it can be due to proximity of the workers to the source of hot asphalt and also exposure to the exhaust gases that releasesd from the construction machinery.
P. Heyrani, A. Baghaei,
Volume 6, Issue 1 (4-2016)
Abstract
Introduction: Nowadays, gas and oil account for 60 percent of world energy resources. Transporting crude oil and its products are accomplished through a number of ways among which pipelines are of the utmost significance. Considering the extent of pipelines in installation and residential areas and also high potential for damage, the safety of these pipes and application of risk management principles have undeniable importance. Bow-tie risk assessment method is one of the ways to determine safety level. The tool is a qualitative and semi-quantitative method the data of which are implemented by specialists and experts via conducting surveys.
Method and material: In the present study, Bow-tie technique was employed having been combined with fuzzy logic in which Likret Scale was applied to quantify the qualitative (verbal) data to reduce the uncertainty of risk evaluation of Amaak No.10 gas pipeline and Bongestan No.12 petroleum pipeline. In this way, factors affecting the pipeline safety were at first, recognized through the checklists. Then, the risk evaluation of pipplines was conducted using the mentioned method.
Results: The results of the study showed that third party damages, initial defects in materials, and constructing pipeline with failure possibility of 0.0484 stood at the highest in terms of importance (equivalent to 12.32%) in destroying oil and gas pipelines. In addition, the toxic impacts and environmental damages with occurrence possibility of 0.00327 were the most striking consequences of gas and oil leakage based on event tree analysis.
Conclusion: Considering the recognized factors leading to destruction of pipelines and their most notable outcomes, instructions on how to control and reduce the potential consequences were suggested, with emphasis on the removal of the most probable causes.
Taleb Askaripoor, Majid Motamedzade, Rostam Golmohammadi, Mohammad Babamiri, Maryam Farhadian, Hamed Aghaei, Mohammad Ebrahim Ghaffari, Elahe Kazemi, Mehdi Samavati,
Volume 11, Issue 4 (12-2021)
Abstract
Introduction: Recent evidence indicates that lighting can affect physiological and neurobehavioral human functions, referred to as non-image forming (NIF) effects of lighteffects. This study aimed to determine the effects of illumination levels and correlated color temperature (CCT) on alertness and performance under NIF conditions.
Material and Methods: In this study, 22 participants were exposed to light at various levels of illumination, including very low illuminance (<5 lux, control) and light conditions with correlated color temperatures (CCT) of 4000 K, 8000 K, and 12000 K at 300 and 500 lux. The data collection process included recording the power of brainwaves (alpha, alpha-theta, beta, and theta), sleepiness and mood scales, and cognitive performance tests for sustained attention, psychomotor vigilance task (PVT), working memory, and inhibitory capacity.
Results: The results indicated that 500 lux light conditions at correlated color temperatures of 8000 and 12000K significantly reduced normalized alpha, alpha-theta power, subjective sleepiness, and performance compared to the dim light condition. Under illumination levels of 300 and 500 lux, there were no significant differences in the measured values of the variables.
Conclusion: Lighting interventions can be used as a supplement to other strategies for increasing alertness and performance in the workplace.
Zahra Samadi, Milad Mansouri, Fatemeh Aghaei, Abolfazl Ghahramani,
Volume 12, Issue 1 (3-2022)
Abstract
Introduction: Maintaining and improving organizational safety requires a strong safety culture. Following the occurrence of occupational incidents, proper registration, reporting, and investigation is a key requirement for safety culture to provide an appropriate learning culture. As a result, this study was carried out to assess the culture of occupational incident registration, reporting, and investigation in the province of west Azarbaijan’s industries.
Material and Methods: In this cross-sectional study, data on the culture of registration, reporting, and investigating occupational incident were collected using a 68-item questionnaire. A total of 420 employees from a number of construction and mine companies, as well as hospitals participated in this study.
Results: The results of study showed that the average total score for the culture of registration, reporting, and investigating occupational incidents was 3.08 (±0.38), with the factor of corrective action had the highest 3.17 (±0.72) and the reasons for lack of reporting had the lowest 2.90 (±0.54) scores. There was also a significant relationship between the average score of the culture of registration, reporting, and investigating occupational incidents with education, industries, and companies. Employees who attended training courses had a lower mean score for the culture of occupational incident’ registration, reporting, and investigation than those who did not take training courses. The mean score of the culture of registration, reporting, and investigating occupational incidents of the employees who had experienced an occupational accident was lower than those who had not experience occupational accidents in the past.
Conclusion: The findings of this study revealed that corrective actions is necessary after the occurrence of occupational incidents. Attending training courses and having an occupational accident experience had no positive impact on promoting culture of registration, reporting, and investigating occupational incidents.
