نتایج جستجو برای: stress factors
تعداد نتایج: 1466054 فیلتر نتایج به سال:
In this paper, the interface crack of two non-homogenous functionally graded materials is studied. Subsequently, with employing the displacement method for fracture of mixed-mode stress intensity factors, the continuous variation of material properties are calculated. In this investigation, the displacements are derived with employing of the functional graded material programming and analysis o...
nowadays, occupational accidents are one of the most important problems in developing countries. job stress and unsafe acts have been also recognized as effective factors in increasing the risk of occupational accidents. the main goal of this research was to evaluate the relationship between job stress and unsafe acts with occupational accidents. this study was performed on 195 employees in par...
1- McGonagle KA, Kessler RC. Chronic stress, acute stress, and depressive symptoms. Am J community psychol 1990; 18(5): 681-706. 2- Bowman RE, Beck KD, Luine VN. Chronic stress effects on memory: sex differences in performance and monoaminergic activity. Hormones behav 2003; 43(1): 48-59. 3- LaDou J. Current Occupational & Environmental Medicine. 5ft ed. New York: MC GrowHill; 2014. 4-...
Factor and principal component analyses are widely used in different sciences especially in agricultural science. To determine the factors that create variation between potato cultivars, in normal (non-stress) and water deficit (stress) conditions, two experiments were conducted in the form of randomized complete block design with three replications in summer 2002. Stepwise regression analysis ...
three medium magnitude events happened inside the transitional border of south alborz and central iran; namely kahak-qom 2007/06/18 event with ml 5.6, zanjan 2008/05/27 event with ml 5.3 and aradan-garmsar 2007/11/19 event with ml 5.1. this provides us the opportunity to compute focal mechanism and stress drop of the events and compare them with those events happened within the alborz range.
tourism , today as one of the ways to make money, create jobs , and social and political interactions is considered. this paper aims to examine the strengths and weaknesses of tourism development in mahmoud abad ( mazandaran ). the research method in this study is " descriptive - analytical " and to collection of data used field methods such as questionnaires and documentation - library. the sa...
چکیده ندارد.
in this paper, the solution of a moving volterra-type screw dislocation in an orthotropic layer, bonded between two piezoelectric layers is obtained using complex fourier transform. the dislocation solution is then employed as strain nuclei to derive singular integral equations for a medium weakened by multiple moving cracks. these equations, which are classified as, cauchy singular equations, ...
Objective: Occupational stress is one of the main problems in medical centers. It affects the physical and mental health of medical staff. This study aims to design a stress management model to find occupational stressors in hospital staff. Methods: This is a descriptive-correlational study that was conducted in 2021. The study population consists of 2046 employees (with permanent, temporary, ...
in order to investigate of the effects of water stress on seed yield and gas exchange and to evaluate the relationship between source and sink in sunflower azargol variety, a split-plot factorial field experiment was conducted in 2008. in this experiment, water stress (no irrigation from 30 days after sowing till ripening) and irrigation (irrigation at -3 bar soil water potential) were consider...
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