Showing 11 results for babaei
Arezoo Esmaeilzadeh, Farideh Golbabaei, Soodabeh Zare,
Volume 1, Issue 3 (Autumn 2014)
Abstract
Background & Objectives : Chemicals are serious harmful agents in the workplace, especially chemistry labs. This material may cause poisoning and different diseases. Laboratory hoods as first safety device protect laboratory workers against hazardous chemicals. This research conducted on chemistry labs in a petrochemical company for awareness of the hoods performance and proposed the needed reforms .
Methods: In this study, in the studied laboratories, in order to evaluate performance of lab hoods, a capture velocity for 22 chemical hoods was conducted. Information concerning the structural characteristics of the baffle position , airfoil and opening area of hood s and situational characteristics their position relative to the air stream sources include general ventilation system vents , doors and windows of the laboratory were gathered .
Results: The mean velocity of hoods compared to the minimum acceptable value of 80 fpm showed that the only 9.09 % of their hoods can provide an acceptable velocity . There was a significant relationship between the numerical value of the velocity and position features hoods structure (Pvalue<0/05).
Conclusion: The results should that the structure of hood s and their locations in the studied laboratory concerning air flow sources must be corrected so that the velocity and performance of hoods being must provided and maintained .
Alireza Koohpaei, Seyed Jamaladdin Shahtaheri, Farideh Golbabaei, Ali Ebrahimi,
Volume 2, Issue 1 (Spring 2015)
Abstract
Background and Objective: Biological adsorbents under undesirable conditions have not suitable performance. Based on this problem, the using of the molecular imprinted polymers (MIPs) have been proposed. This study was conducted to adsorption of trace triazinic pesticides with synthesis and optimization of molecular imprinted polymers as a novel solid phase extraction (MISPE).
Methods: In this study, atrazine and ametrin polymer and blank were synthesized by central composite design method and optimized based on the amount of functional monomer, template, cross linker, initiator, solvents and polymerization temperature. Then the appropriate cartridge was selected and SPE procedure based on the concentration, sample volume, flow rate and sample pH were optimized with response surface methodology. Concentration factor and as well as reusability of the cartridges were examined finally.
Results: Based on the obtained results, for ametryn and atrazine, optimized temperature was calculated equals to 40.86 °c, 6.41 and 5.03 ml for solvent, 27.070 and 21.32 for crosslinker, 2.03 and 2.27 mmol of initiator, 5.41 and 4.73 mmol for monomer and 1.204 and 0.811 for template respectively. Based on the optimization results of the molecular imprinted solid phase extraction, it was revealed that there are recovery rate over 90 percent for the drinking water and urine as spike.
Conclusion: The results showed that central composite design can be used as a general tool for polymer synthesis and optimization of molecular imprinted solid phase extraction. Polymers according to theirs high-performance and selectivity also can assume an important role in monitoring the work environment.
Arash Ghasemi, Faride Atabi, Faride Golbabaei,
Volume 2, Issue 3 (Autumn 2015)
Abstract
Background & objective: Occupational accidents may occur in any types of activities. Carrying out daily activities such as repairing and maintaining are one of the work phases that have high risck. Despite the issuance of work permits or work license systems for controling the risks of non-routine activities, the high rate of accidents during activity indicates the inadequacy of such systems. A main portion of this lacking is attributed to the human errors. Then, it is necessary to identify and control the probable human errors during issuing permits.
Methods: In the present study, the probable errors for four categories of working permits were identified using SHERPA method. Then, an expert team analyzed 25500 issued permits during a period of approximately one year. Most of frequent human errors and their types were determined.
Results: The “Excavation” and “Entry to confined space” permit possess the most errors. Approximately, 28.5 present of all errors were related to the excavation permits. The implementation error was recognized as the most frequent error for all types of error taxonomy. For every category of permits, about 40% of all errors were attributed to the implementation errors.
Conclusion: The results may indicate the weakness points in the practical training of the licensing system. The human error identification methods can be used to predict and decrease the human errors.
Morteza Babaei, Farshid Gorbani Shahna, Abdolrahman Bahrami ,
Volume 3, Issue 1 (Spring 2016)
Abstract
Introduction: Control of fugitative dust from mining process and application of an appropriate and economical system for dust collecting is essential. The goal of this study was cost-benefit analysis of an integrated systems and compare to bag filter in a crushing plant of a mining company.
Methods: A local exhaust ventilation system for capture of emitted particlees, a water spray for dust suppresion at sources and parallel Stairmand model cyclones as dust colletor were designed and installed based on the standards and guidelines. Then, efficiency of wetting and industrial ventilation system for control of ambient dust personal exposure and environmental emission have evaluated as integrated and alone. Finally, cost-benefit analysis of this system was compared to bag filter.
Results: The efficiency of this system for control personal exposure repairable particles and emitted dust to ambient air was 87% and 95% for plant 1 and 88% and 95% for plant 2, respectively. The concentration of emitted emitted dust from stack to environment were 121.28 mg/m3 and 112/68 mg/m3 for plant 1 and 2, respectively. The capital, operational and maintence costs of this option was 217 and 0.992 billion rials lower than bag filter. Also, annuall collected dust by cyclones was worth 518 million rial.
Conclusion: According to results, integrated system had a significant impact on emitted dust in workplace and environment. The economical analysis domonstrated 73% and 80% savings in capital and operational costs compared to bag filter. Total costs of implented project will be compensated at 220 day with recovered dusts, therefore, in the same condition, it can be suggested as the favourable and economical solution.
Sajjad Deyhim, Morteza Babaei, Majid Motamedzade,
Volume 3, Issue 2 (Summer 2016)
Abstract
introduction: One of the most common causes of occupational injuries in industrialized and developing countries is musculoskeletal disorders Determining the risk factors of musculoskeletal disorders can be helpful choosing the right method for interventions and detailed studies. This study aimed to evaluate the ergonomic risk factors in operators of pressurized irrigation equipment factory.
Materials and Methods: This cross-sectional study was conducted in a pressurized irrigation equipment manufacturing company. In this study, a new method based on observation was used to evaluate the ergonomic aspects of operator's activity. In order to assign tasks and sub-tasks, direct observation and video recording equipment were used. Ergonomic assessment was carried out on all sub-tasks identified. then, the criticality of the task determined.
Results: Among the tasks identified 53 very critical posture 61 critical and 82 low critical posture was determined. Ergonomic point in the ball valve production line was 0.6 and 0.68 respectively for tow operator. For drop valve and automatic valve production line's ergonomic point was 0.52 and 0.67 respectively.
Conclusion: According to the results, posture analysis method used in this study is easy and accurate. The advantage of this method is 14 ergonomic domaines that covered whole body and time fragment of each task. Findings of previous studies showed good correlation between results from this method and OCRA method.
In this study, The most critical posture was related to operator's wrist, so it is recommended that control measures on wrist posture correction should be considered.
Mohammadreza Azhdari, Ghazaleh Monazami Tehrani, Ahmad Alibabaei,
Volume 3, Issue 4 (Winter 2017)
Abstract
Background & Objectives: Maintenance is an important tool for the petrochemical industries to prevent of accidents and increase operational and process safety success. The purpose of this study was to identify the possible causes of incidents caused by human error in the petrochemical maintenance activities by using Human Factors Analysis and Classification System (HFACS).
Methods: This study is a cross-sectional analysis that was conducted in Zagros Petrochemical Company, Asaluyeh-Iran. A checklist of human error-induced incidents was developed based on four HFACS main levels and nineteen sub-groups. Hierarchical task analysis (HTA) technique was used to identify maintenance activities and tasks. The main causes of possible incidents were identified by checklist and recorded. Corrective and preventive actions were defined depending on priority.
Results: The content analysis of worksheets of 444 activities showed 37.6% of the causes at the level of unsafe actions, 27.5% at the level of unsafe supervision, 20.9% at the level of preconditions for unsafe acts and 14% of the causes at the level of organizational effects. The HFACS sub-groups showed errors (24.36%) inadequate supervision (14.89%) and violations (13.26%) with the most frequency.
Conclusion: In order to prevent and reduce the occurrence of the identified errors, reducing the rate of the detected errors is crucial. Findings of this study showed that appropriate controlling measures such as periodical training of work procedures and supervision improvement decrease the human error-induced incidents in petrochemical industry maintenance.
Tehrani Ghazaleh Monazami, Tehrani Rostam Esmaeili, Ahmad Alibabaei,
Volume 6, Issue 2 (Summer 2019)
Abstract
Background and Objective: The construction industry is one of the most dangerous industries. Therefore, in order to improve the conditions and perform preventative interventions, the senior managers of construction projects need to understand the factors affecting safety performance. In this regard, the present study aimed to investigate the relationship between safety investments and safety performance indicators in the construction industry.
Materials and Methods: This descriptive-analytic study was carried out on five major construction worksites of Tehran, Iran, using multiple case study method in 2018. Data were collected using various techniques, such as performing structured interviews, evaluating safety documentation, and using questionnaires. Collected data were analyzed using SPSS software (version 18).
Results: Obtained results of the present study indicated a strong negative correlation between the various types of safety investments (i.e., total safety investments, basic safety investments, and voluntary safety investments) and accident frequency rate (i.e., retrospective index) (r=-0.936, P<0.05). In addition, the findings revealed a strong direct correlation of the aforementioned variable with safety performance (i.e., prospective indicator) (r=0.939, P<0.05). Furthermore, there was a significant relationship between marital status and age with safety performance (P<0.05).
Conclusion: Results of the present study showed that an increase in the level of safety investments (i.e., total safety investments, basic safety investments, and voluntary safety investments) will improve safety performance.
Faezeh Alibabaei, Ehsan Saebnoori, , Pejman Roohi, , ,
Volume 7, Issue 1 (Spring 2020)
Abstract
Background and Objective: Mercaptan is used to add odor to natural gas. The current method utilized for deodorizing empty barrels by sodium hypochlorite has been carried out through chemical oxidation and reported with some problems. In this regard, the current study investigated the changes in the initial concentration parameters of sodium ferrate nanoparticles, initial temperature, and initial pH in the removal efficiency of the odorant.
Materials and Methods: To evaluate sodium ferrate nanoparticles in different concentrations, mercaptan compounds were added to the gas odorant, and the effect of different parameters on removal efficiency was investigated.
Results: The obtained results of the present study showed that by increasing the sodium ferrate concentrations, the removal efficiency of the odorant increased through decreasing the initial temperature and pH.
Conclusion: The use of sodium ferrate nanoparticles was investigated in this study due to the reduction of the oxidation time and number of used chemicals, ease of operation by this material, safe operation, odorlessness, nontoxicity, and high performance.
Ali Asghar Sajedian, Dr Ali Karimi, Mohsen Sadeghi Yarandi, Vahid Ahmadi, Yasaman Aala, Farideh Golbabaei,
Volume 7, Issue 3 (Autumn 2020)
Abstract
Background and Objective: Acrylonitrile is a potential carcinogen for humans and exposure to its vapors can have a variety of adverse effects on employees in the petrochemical industry. Therefore, the present study was conducted to determine the level of exposure and assess the quantitative health risk of exposure to acrylonitrile vapors in the exposed personnel of a petrochemical complex.
Materials and Methods: In this cross-sectional study, which was conducted in a petrochemical complex, a total of 45 inhaled air (3 samples per person) was sampled. Samples were collected using absorbent tubes containing activated charcoal from SKC. The samples were prepared and analyzed according to the 1601 NIOSH method using the VARIAN CP-3800 gas chromatography . Finally, the US Environmental Protection Agency (EPA) method was used to determine the level of employee exposure and the health or non-cancer risk index (HQ). Data analysis was performed using SPSS software version 25. In order to investigate the differences between different sections in terms of exposure and health risk, Kruskal-Wallis statistical test was used at a significance level of less than 0.05.
Results: The results of the present study showed that the average concentration of acrylonitrile vapors in the studied petrochemical complex is 71.1±122.8 micrograms per cubic meter (0.033±0.056 ppm) on average. The non-carcinogenic risk was also calculated to be 4.04±6.93. It was found that 47.6% of the subjects were within the permissible non-carcinogenic range (HQ <1) and 53.3% of the subjects were within the allowable range (HQ> 1).
Conclusion: Considering that the health risk of exposure to acrylonitrile vapors in the studied petrochemical complex was more than the recommended range (2 ppm or 4.34 mg/m3), taking engineering and management measures to control and reduce the risk levels to an acceptable level, including modification of local and general ventilation systems, as one of the main reasons for the respiratory exposure of the workers, is essential for the improvement of the situation.
Majid Habibi Mohraz, Farideh Golbabaei, Il Je Yu,
Volume 8, Issue 3 (Autumn 2021)
Abstract
Background and Objective: The accumulation of airborne bioaerosols on filtration media and their gradual proliferation in the presence of appropriate moisture and environmental conditions is one of the major problems against using these media. The use of hybrid media containing antibacterial agents is one of the available solutions to this problem. The present study aimed to fabricate nonwoven nanofiber media with an antibacterial activity using an electrospinning process.
Materials and Methods: Polyurethane-chitosan nanofiber media the weight ratios of 100 to 0, 90 to 10, 80 to 20, and 70 to 30 were fabricated by simultaneous electrospinning process. The evaluation of the antibacterial properties of the media was performed after their preparation by standard methods of disk diffusion (ISO 20645) and colony counting (ISO 20743).
Results: The investigation of antibacterial activity of samples by both methods showed that the media with polyurethane to chitosan weight ratio of 70 to 30 had suitable antibacterial activity. The mean values of bacterial growth inhibition zone and antibacterial activity for polyurethane-chitosan (70/30) media were obtained at 0.26 and 2.225 mm, respectively, indicating the significant antibacterial activity of this media.
Conclusion: The results showed that antibacterial nanofiber media can be created by adding chitosan nanofibers as antimicrobial agents to the polyurethane nanofiber.
Dr Masoud Shafiee Motlagh, Ali Sobhani Dargah, Amirali Shad, Amirreza Babaei, Mohamad Dinarvand, Arman Hedayati,
Volume 11, Issue 4 (winter 2025)
Abstract
Introduction: Glass manufacturing factories face challenges such as noise and heat as they are one of the industries that expose employees to harmful physical factors. This study aims to design and validate a chamber to reduce workers’ exposure to noise and heat while providing desire lighting in a glass manufacturing industry.
Methods: In this study, the heat exposure of 16 workers was evaluated using the Wet Bulb Globe Temperature (WBGT) index measured with a calibrated QUESTEMP 10 device, as well as perceived stress index (PeSI). Environmental noise was measured using a calibrated Casella CEL-450 sound level meter. The chamber design included calculations of thermal loads and air conditioning inside the chamber using psychrometric charts and determination of sound transmission loss. The effectiveness of the chamber was simulated with WBGT and noise maps at 48 measurement stations using Surfer 21.6.216 software. Additionally, an artificial lighting system was designed using DIALux version 13.4.
Findings: The highest and lowest WBGT values were 40.36 and 17.82 degrees Celsius, respectively. The average perceived stress of the first and second shift workers was 0.86 ± 8.41 and 0.88 ± 7.66, respectively. The sound pressure level in the production hall was measured at 94.16 dB, which was estimated to be about 74.16 dB inside the chamber. The average illumination intensity was measured at 304 lux, with a uniformity ratio of 0.63.
Discussion and Conclusion: The designed chamber effectively reduces noise and heat exposure in the glass manufacturing industry, while ensuring adequate lighting for employees.
