one series of half-analogues of michler’s ketone containing one or more terminal methoxysubstituents with variable tertiary amino groups have been used in this study. nmr spectralresults for the parent ketones confirm earlier findings that ortho proton shifts are apparentlyindependent from steric effects in derivatives of michler’s ketone because the ring current andcarbonyl-induced shifts are ...

shiftwork that affects diverse aspects of human life is arranged in various schedules. the main purpose of this study was to compare psycho-social problems among employees working in different 12-hour shift schedules of iranian petrochemical industries. this cross-sectional study was carried out at eight petrochemical companies in asalooyeh area. the study population consisted of 549 shift work...

The Mössbauer spectra of nanoferrite materials such as Ni0.25Mn0.75Fe2O4, Co0.5Mn0.5Fe2O4 and Ni0.4Co0.6Fe2O4 have been reported and the above materials were prepared by sol-gel combustion method using metal nitrates as source material and Polyvinyl alcohol(PVA) as...

‎in this text we prove that in generalized shift dynamical system $(x^gamma,sigma_varphi)$‎ ‎for finite discrete $x$ with at least two elements‎, ‎infinite countable set $gamma$ and‎ ‎arbitrary map $varphi:gammatogamma$‎, ‎the following statements are equivalent‎: ‎ - the dynamical system $(x^gamma,sigma_varphi)$ is‎ li-yorke chaotic;‎ - the dynamical system $(x^gamma,sigma_varphi)$ has‎ an scr...

conclusions according to the findings of this study, there is no relationship between shift work and changes in serum tg and cholesterol. the lack of relationship can be due to shift plans for shift workers, nutrition, or the “healthy heart project” at isfahan mobarakeh steel company. results the results showed a significant difference in cholesterol levels between shift workers and day workers...

in recent decades, the issue of stress and its negative consequences such as violence in the workplace, increased accidents at work, absenteeism and burnout, have deleterious effects on the efficiency and economy. the aim of this study was to determine the occupational stress of pelletizing industry workers and its determinants. this study was descriptive-analytical and cross sectional. among w...

in order to investigate the combined effects of shift work and heat stress on the physiological parameters, such as heart rate (hr) and body temperature (bt), a hot-dry working environment was investigated for 53 workers in foundry workshops. in this study wet bulb globe temperature index (wbgt) was measured and along with that simultaneously heart rate and oral temperature were checked in 3 sh...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background: after conducting a study on shift work and its related health problems in a petrochemical company and recommending a new shift system, the company changed its shift schedule from 12-hour to 8-hour pattern. after a year of implementing this new system, the present study was carried out to evaluate the effects of...

background and objective : restless legs syndrome (rls) is a sleep disorder with an association to sleep quality. we investigated the sleep quality in patients with rls among health-care workers with or without shift work. materials and methods : all female health-care workers (n = 540) in four educational hospitals were enrolled in this cross-sectional study. international rls study group (irl...