فهرست مطالب yaser sahranavard

Musculoskeletal disorders are one of the most common causes of occupational injuries that mainly affect the low back, neck, and upper limbs. Preventing these discomforts requires assessing workplace posture using ergonomic job analysis methods. The aim of this study was to determine the rate of musculoskeletal injuries of mechanical repairs using REBA method in 2018 in Sarcheshmeh copper mine.

In this descriptive-analytical study, the workplace posture of 65 mechanical repairs were evaluated using REBA method. The prevalence of musculoskeletal disorders was also obtained using the Nordic questionnaire. The collected data were analyzed by SPSS 20.

In this study, the prevalence of wrist discomfort was 43.07%, neck 18.46%, shoulder 33.84%, low back 53.85%, and leg 27.70%. Regarding the risk level of the right limb, 9.25% of the subjects were at a low level, 46.15% at a medium level, 32.30% at a high level, and 12.30% at a very high level. Also, regarding the risk level of the left limb, 4.62% of the subjects were at a low level, 64.61% at a medium level, 26.15% at a high level, and 4.62% at a very high level.

These results indicated that the workplace posture of the subjects needed to be improved. To prevent the occurrence of these disorders, education is required to recognize biomechanical risk factors and correct methods of working, use of appropriate tools and appropriate to the work process, and improvement and control of stressors and environmental factors.

work-related musculoskeletal complications are one of the causes of disability and risk factors such as manual handling and repetitive work can cause or exacerbate these disorders. Considering the fact that in the industry, people with a wide range of risk factors for these disorders and high mental health are facing, this study was designed to investigate the position of work posture and mental load and their relationship with the operating personnel of Sarcheshmeh copper.
In this descriptive cross-sectional study, 220 individuals were selected randomly from a population of 800 people based on the demographic distribution of the units and the field study of the working areas. Data were collected using demographic, Nordic and NASA mental workload index and QEC software. SPSS software was used to analyze the data.
In this industry, due to the nature of work, the prevalence of musculoskeletal disorders was high in at least one region of the subjects. The prevalence of these disorders was related to the area of rest and back (38.6%) and back (38.2%) and The least of them was one or two females (2.3%) and there was a significant relationship between the mean total burden of mental health and the risk level and prevalence of disorders (p Due to the high risk of the occurrence and prevalence of musculoskeletal disorders and its relation with individual characteristics such as age and work experience and mental labor, it is necessary to control and reduce these disorders and the level of risk by implementing engineering controls such as mechanical appliances and tools. They stepped up and, with interventions such as a job rotation program, with the age and work experience of individuals, they were employed in jobs with different mental and physical needs that involve various muscle groups

One of the most common harmful factors in the workplace is noise. Noise control is a factor beneficial for health and safety in the workplace.
The current study aimed to design and manufacture a silencer for the cooling tower pump of Sarcheshmeh Copper power station in order to control noise.
In this study, sound pressure level was measured by the use of a sound level meter (B & K 2260). Measurement was carried out in the light of ISO 1996 standard. After studying technical and acoustic features of the noise source, a dispersive-absorptive silencer was designed to control noise pollution generated by the cooling tower pump of the thermal station. After analyzing the frequencies of sound pressure level and using available data, a cylindrical silencer (with a diameter of 1.5 m and height of 3 m) was designed and manufactured. The internal part of the silencer was filled with different columns of absorbent material covered with punched metal. Therefore, the silencer consisted of (1) acoustic diffuser, (2) acoustic chamber, and (3) acoustic channels.
Measurements showed that, at a distance of 1 m from the source, sound pressure level reduced from 127 dBA before installing the silencer to 79 dBA after the installation, resulting in a reduction of 48 dBA.
Using a silencer with absorbent material (glass wool) is very effective in reducing the noise generated by the pump.

Studies have shown that psychological factors have a significant effect on psychological disorders and work-related accidents. Improving mental conditions and paying attention to these factors can increase the health of employees. Job satisfaction is one of the important psychological factors for employees and a positive emotional factor in motivating and increasing productivity. The purpose of this study was to investigate the relationship of job stress and work load with job satisfaction among Sarcheshmeh copper mine workers.
This cross-sectional descriptive study was carried out on 100 employees of Sarcheshmeh copper mine. Data were collected from reliable job satisfaction, workload, and occupational stress questionnaires. To analyze the data, SPSS16 software was used.
Based on the results obtained from the software, at confidence level of 95%, the significance level between the two variables of job stress and job satisfaction is less than 0.05 (0.003), and the correlation between the two variables is significant. The significance level between two variables of job load and job satisfaction at confidence level of 95% is more than 0.05 (0.794), which is not significant.
The results of this study indicated that job satisfaction can be influenced by job stress. Contrary to our expectation, the relationship between work load and job satisfaction was rejected

Background & Aims of the Study: Welder’s exposure to welding fumes can cause occupational diseases. The current study sought to examine exposure to welding fumes among welders who work in the repair shop of Sarcheshmeh Copper Complex and design a local exhaust ventilation system to control exposure to welding fumes.
This applied analytical study was conducted in the summer of 2016 among welders working in the repair shop of Sarcheshmeh Copper Complex. The study comprised three phases; in the first one, welders’ exposure to welding fumes was assessed at the beginning of the study. After that, a local exhaust ventilation system was designed and installed in the aforementioned repair shop. In the final stage, welders’ exposure to welding fumes was assessed again after installation of the ventilation system. The procedure recommended by NIOSH (method number 7300) was used for individual sampling of welders.
Based on the obtained findings, before installing the ventilation system, welding technicians were exposed to 0.3 mg/m3 of copper fumes and 0.04 mg/m3 of chromium fumes. Journeyman welders were also exposed to 2.16 mg/m3 of manganese fumes, while stellar welders were exposed to 6.9 mg/m3 of iron fumes. In the light of these measurements, a local exhaust ventilation system was designed and installed. Subsequently, measurement of exposure to welding fumes showed a significant reduction. That is, welding technicians were exposed to 0.17 mg/m3 and 0.015 mg/m3 of copper and chromium fumes respectively. Additionally, journeyman welders were exposed to 0.86 mg/m3 of manganese fumes, whereas stellar welders were exposed to 4.3 mg/m3 of iron fumes.
A comparison of standard limits of exposure to welding fumes and the results obtained from measurements in sampling stations before and after the installation of the local exhaust ventilation system reveals that this controlling measure was very effective in the repair shop of Sarcheshmeh Copper Complex.

Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) are important parts of the volatile organic compounds (VOCs) family, which are widely used in many industries. These have been classified as carcinogenic compounds and the neurotoxic effects of BTEX have been reported; so, a screening evaluation of workplace air quality for determining BTEX may seem necessary.
In order to measure the workplace concentrations of BTEX in the hydrometallurgical process, six sampling stations were selected. Volatile organic compounds were analyzed using the method 1501 of the National Institute for Occupational Safety and Health (NIOSH). Activated carbon was used for sampling and samples were analyzed by gas chromatography with flame ionization detection (GC-FID).
The highest measured levels were observed for ethylbenzene at sampling station 1 (0.8 ppm). The concentration of benzene in this sampling location was 0.05 ppm. The highest toluene concentration was reported at sampling station 4 (0.15 ppm) and the lowest toluene concentration was 0.02 ppm at sampling station 6.
Indoor air quality in workplaces can be affected by the presence of BTEX. The results of measurements of BTEX showed low concentration levels of these compounds in the studied workplace.

Workers may be exposed to non-ionizing radiation from sun or artificial sources such as some types of lamps and the arc-welding process. Skin burning, accelerating the skin aging, cataract, retinal burn, gene mutation, and adverse effects on human immune system are the other causes for concern. The objectives of this research are to determine the amount of workers’ exposure to ultraviolet and infrared radiations in different occupational groups and assessing the effectiveness of eye protection equipment on protection of workers against exposure to ultraviolet and infrared radiations inSarcheshmeh Copper Complex.

The amount of workers’ exposure to ultraviolet and infrared radiations in two conditions (using eye protection equipment and not use protective equipment) was investigated. For the purpose of measuring the amount of workers’ exposure, measurements were conducted using Hagner digital radiometer at 8 times during each month over a one year period.

The average intensities of ultraviolet radiation according to different months in the mining workshop, smelting unit, and engineering workshop were 0.29, 0.25, and 0.08 MW/cm2, respectively. The average intensities of infrared radiation in the smelting unit, casting unit, and refinery unit were 5.96, 2.60, and 1.87 MW/cm2, respectively. The results of study indicated that eye protective equipment was significantly associated with decreases in the amount of workers’ exposure to ultraviolet and infrared radiations in these workplaces (p< 0.001).

Eye protective equipment is the effective barrier against workers’ exposure to ultraviolet and infrared radiations.