Investigation of electroencephalography variations of mental workload in the exposure of the psychoacoustic in both male and female groups.

Most studies have examined the effect of the physical aspects of noise while the effect of exposure to psychoacoustic parameters at different task difficulty levels has been less evaluated. Therefore, this study was performed with the aim of investigating the brainwave in the face of psychoacoustic and the change of difficulty level of task. 120 persons were exposed to 16 psychoacoustic parameters (loudness, sharpness, roughness and fluctuation strength).

The contribution of hypochondria resulting from Corona virus on the occupational productivity loss through increased job stress and decreased resilience in the central workshop of an oil refinery: A path analysis.

The prevalence of contagious viral-infectious diseases such as COVID19 cause the economic problems in addition to harmful effect on the people health. The present study was aimed to determine the contribution of hypochondria resulting from Corona virus on the occupational productivity loss through increased job stress and decreased resilience in the central workshop of an oil refinery. This cross-sectional study was conducted on 275 subjects in the spring of 2020 in one of the oil and gas industries in southern Iran.

Effect of tonal noise and task difficulty on electroencephalography and cognitive performance.

The present study aimed to investigate the effect of tonal noise and task difficulty on electroencephalography (EEG) and cognitive performance. Twelve healthy volunteers participated in the present study. Four noise signals were generated by four prominence tone levels (0, 2, 5 and 9) at background noise levels of 55 dBA and frequency of 500 Hz using the Test Tone Generator from Esser Audio (USA).

Correction to: Effects of noise on mental performance and annoyance considering task difficulty level and tone components of noise.

[This corrects the article DOI: 10.1007/s40201-019-00353-2.].

Effects of noise on mental performance and annoyance considering task difficulty level and tone components of noise.

Rotating components in mechanical systems produce tonal noises and the presence of these tones effect the quality and comfort of occupants leading to annoyance and a decrease in mental performance. The ISO 1996-2 and ANSI S1.13 standards have described metrics to quantify the effects of prominent tones, but more research on how noise attributes effect annoyance and performance, especially in different levels of task difficulty are necessary.

Heavy metals determination in honey samples using inductively coupled plasma-optical emission spectrometry.

Background: Honey contains a complex mixture of carbohydrates and other minor substances. Elements are minor constituents of honey that may threaten the human health in excess concentrations. So, determining the metals in honey helps its quality control as a food product.

Review the number of accidents in Tehran over a two-year period and prediction of the number of events based on a time-series model.

Background: One of the significant dangers that threaten people's lives is the increased risk of accidents. Annually, more than 1.3 million people die around the world as a result of accidents, and it has been estimated that approximately 300 deaths occur daily due to traffic accidents in the world with more than 50% of that number being people who were not even passengers in the cars.

The effect of the use of NP305 masks in improving respiratory symptoms in workers exposed to sulfuric acid mists in plating and pickling units.

Background: Plating and pickling processes are the most effective ways for increasing the strength of metal structures, and workers in these units are exposed to various contaminants, including acid mists. The aim of this study was to investigate the effect of protective masks in decreasing the respiratory symptoms and the aerobic capacity of workers that are exposed sulfuric acid mist.

Methods: This interventional study was based on National Institute for Occupational Safety and Health (NIOSH) standard 7903 in which silica gel tubes are used for sampling the air in plating and pickling units for eight hours.