نتایج جستجو برای: shift
تعداد نتایج: 136752 فیلتر نتایج به سال:
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...
Municipality of Tehran with huge number of employees and with the aim to reduce stress and promote the work efficiency, seriously wants to achieve suitable and utilizable studies. Osipow's job stress test is one of the best tools to reach this aim. Data population includes securities building of municipality of Tehran (88 persons from region 18 and 72 persons from region 20), who were randomly ...
Introduction: Many industries need to work all day long and present full-time services. Therefore, individuals and organizations are exposed to new issues like shift work. The necessity of attention to work environment and worker’s health and job stress provoked us to conduct this study to investigate the relationship between job stress and shift work. Methods: In a descriptive and survey stud...
Background: High levels of fatigue in the workplaces can lead to reduced productivity, and increase the risk of accidents and injuries. Purpose of this study was to assess and compare the fatigue levels among fixed-dayshift and rotating-shift workers of a rolling mills and steel production company in tehran. Methods: The study included 180 workers with fixed- and rotating-shift schedules. The ...
Background: Shift work as a social phenomenon is one of the effective factors on operation of health workers which can have significant impacts on their health. Hence, the current study was conducted to determine the effect of shift working on health problems and the risk factors causing these disorders among nurses. Methods: This cross-sectional study was carried out on 189 nurses selected ...
Influence of Aluminum, Gallium, Indium- Doping on the Boron-Nitride Nanotubes (BNNTs) investigated with density functional theory (DFT) and Hartreefock (HF) methods. For this purpose, the chemical shift of difference atomic nucleus was studied using the gauge included atomic orbital (GIAO) approch. In the following, structural parameter values, electrostatic potential, thermodynamic parameters,...
OBJECTIVE Various support measures useful for promoting joint change approaches to the improvement of both shiftworking arrangements and safety and health management systems were reviewed. A particular focus was placed on enterprise-level risk reduction measures linking working hours and management systems. METHODS Voluntary industry-based guidelines on night and shift work for department sto...
In this article we give two different ways of representations of circular words. Representations with tuples are intended as a compact notation, while representations with trees give a way to easily process all conjugates of a word. The latter form can also be used as a graphical representation of periodic properties of finite (in some cases, infinite) words. We also define iterative representa...
PURPOSE The aim of this study was to investigate whether rotating shift work increases occupational stress in nurses. METHODS This study measured shift work scheduling and occupational stress by using the Effort-Reward Imbalance model with self-reported questionnaires in a sample of 654 female nurses. RESULTS Overcommitment risk was higher in nurses who worked rotating shifts than in those ...
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