This study was performed to evaluate the prevalence of respiratory symptoms in workers in a petrochemical complex and to elucidate the relationship between the prevalence and work-related factors. A questionnaire was distributed to 5,983 male workers working in a petrochemical complex. As for the respiratory symptoms, cough was present in 2.4%, phlegm in 8.1%, wheezing in 2.8% and shortness of ...

Maintaining the best quality is essential for the survival of a company in a globally competitive world. Six Sigma activity has been widely accepted as one of the most efficient and powerful problem-solving methods for quality issues. The define-measure-analyze-improvecontrol (DMAIC) approach based on data has been very powerful for identifying, defining, solving a problem, and controlling the ...

Digital twin (DT) is drawing significant attention both from the academia, industry and government. However, people different fields have understandings cognitions about DT. In addition, most of DT application scenarios discussed belong to discrete manufacturing are not suitable for process manufacturing. Petrochemical a typical with multi-scale hierarchical functional structure in space time. ...

Highly dispersed ternary Ag/C/SnO2 hollow spheres have been synthesized for hydrazine electro-oxidation. The sharp XRD peak of Ag shows that nanoparticles good crystallinity. SEM maintained a spherical morphology with the diameter about 300 nm. TEM average 10 nm disperse well on C/SnO2. advantages derived from C/SnO2 support including carbon, SnO2 and structures may facilitate dispersion close ...

One of the industries with high potential for energy saving is the petrochemical industry. Ethylene and propylene production plants (olefin plants) – as a part of the petrochemical industry – are very energy intensive. So, any try to improve their energy consumption efficiency could lead to a high amount of energy saving. Iran’s petrochemical industry uses old technologies and components and du...

< p>The present study models the risk of investment in the petrochemical industry considering the impacts of exchange rate (US dollar to Iran''''s Rial) movements using the time series data from November 2008 to March 2019 and ARFIMA-FIGARCH framework. The empirical results prove the existence of the Fractal Market Hypothesis, FMH, and the Long Memory property in both the risk and return of the...