In this work, an efficient and green procedure for the synthesis of various substituted 1,5-benzodiazepine derivatives via a one-pot three-component catalytic reaction has been described. The reaction was conducted between o-phenylenediamine, dimedone and aldehyde derivatives in the presence of CuFe2O4 nanoparticles as a magnetic heterogeneous nanocatalyst under ball-milling conditions at room ...

background: musculoskeletal disorders (msds) are one of the most common causes of occupational injuries that appear mainly in back, neck and upper limb. this study was conducted with the objectives of determination of prevalence rate of msds among workers of a generator manufacturing company and ergonomics assessment of working conditions. methods: in this study, 319 workers randomly selected p...

The defect in work rolls directly influence the forming cost and the final shape of the product. The researchers tend to investigate the thermo-mechanical stress in work roll of rolling machines. These stresses may reduce the roll life. Since the investigation of the thermo-mechanical stress in work roll with real-conditions is complex, comprehensive studies by means of numerical methods are av...