نتایج جستجو برای: point stress

تعداد نتایج: 948986  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علم و صنعت ایران 1381

اجزا بدنه خودرو عموما در معرض بارهای نامتناسب قرار دارند. از آنجا که تخمین عمر اجزا سازه و بدنه خودرو عموما به تغییر وزن و شتاب خودرو و هزینه ساخت و مسائل ایمنی و استحکام و عمر سازه منتهی می گردد، در صنایع طراحی و ساخت خودرو از اهمیت ویژه ای برخوردار است. تئوری های ارائه شده در این زمینه عموما برای اجزاسازه ای تحت بارهای بسیار ابتدایی سینوسی و هندسه اولیه ارائه شده اند، به گونه ای که عمر قطعات ...

Journal: :مجله دانشگاه علوم پزشکی کرمانشاه 0
iraj mohammadfam dept. of occupational health, school of public health, hamedan university of medical sciences, hamedan abdol rahman bahrami dept. of occupational health, school of public health, hamedan university of medical sciences, hamedan rostam golmohammadi dept. of occupational health, school of public health, hamedan university of medical sciences, hamedan farin fatemi dept. of occupational health, school of public health, hamedan university of medical sciences, hamedan hossein mahjub dept. of biostatistics & epidemiology, school of public health, hamedan university of medical sciences, hamedan

background: automobile manufacturing industries are considered among the main sites where accidents are likely to happen. from a cognitive point of view, stress can cause problems such as poor concentration, absent-mindedness, and hesitancy while making decisions. this study examines the relationship between job stress and occupational accidents in an automobile manufacturing company. methods: ...

Journal: :رشد و یادگیری حرکتی - ورزشی 0
محمد حسین قهرمانی دانشجوی دکتری، رفتار حرکتی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه فردوسی مشهد، ایران محمد علی بشارت استاد، روان شناسی، دانشکدۀ روان شناسی و علوم تربیتی، دانشگاه تهران، ایران سیدرضا عطارزاده حسینی دانشیار، فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه فردوسی مشهد، ایران علی اکبرنژاد استادیار، فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه تهران، ایران.

coping style is one of the substantial factors influencing sport achievements insport competitions. the main aim of the present study was to examine the effect ofsport stress coping styles on sources of acute stress and salivary cortisol inwrestlers. with regard to the criteria and variables of this study, 30 out of 270active national wrestlers participated according to the cut-off point of cop...

2014
W. Cai R. B. Sills D. M. Barnett W. D. Nix

The chemical equilibrium distribution of point defects modeled as non-overlapping, spherical inclusions with purely positive dilatational eigenstrain in an isotropically elastic solid is derived. The compressive self-stress inside existing inclusions must be excluded from the stress dependence of the equilibrium concentration of the point defects, because it does no work when a new inclusion is...

Journal: :dental research journal 0
pradeep s tangade anmol mathur rahul gupta shikha chaudhary

background: evaluating the factors influence student perception, might allow programmatic changes designed to enhance students’ psychosocial well-being and academic performance. the purpose of this study was to investigate perceived sources of stress on dental students and the role of parents in their career choice decisions. methods: in a cross-sectional design , a modified dental environmenta...

Journal: :علوم باغبانی ایران 0
نجمه زینلی دانشجوی دکتری دانشگاه تهران مجتبی دلشاد استادیار، پردیس کشاورزی و منابع طبیعی کرج، دانشکده علوم زراعی و دامی، گروه علوم باغبانی و فضای سبز، تخصص: فیزیولوژی و اصلاح سبزی¬ها/ تولید گلخانه ای/ سیستم هایدروپونیک عبدالکریم کاشی استاد دانشگاه تهران کمال الدین حق بین استادیار پژوهشگاه ملی مهندسی ژنتیک

this study was conducted to determine water stress tolerance of two iranian dudaim melons (kerman & birjand) and one iranian muskmelon (samsoury). throughout the experiment, three different levels of irrigation with three irrigation starting points (-50, -65 and -75 cb of matric potential) were employed. results indicated that water stress significantly affected yield, firmness, fruit sugars as...

Journal: :international journal of iron & steel society of iran 2006
b. fang e-h. han m. elboujdaini w. zheng j. li

stress-corrosion cracking (scc) tests were conducted in the near-neutral ph standard solution, ns4, and in an actual soil solution, using four-point bending at a high stress ratio and low frequency conditions very similar to those of operational pipelines. pitting incubation appeared first and then pitting initiated and grew in both solutions although there were many more pits on the specimen t...

2006
Michael Stuebner

We introduce a rigorously based numerical method for compliance minimization problems in the presence of point wise stress constraints. The method is based on new multiscale quantities that measure the amplification of the local stress due to the microstructure. The design method is illustrated for two different kinds of problems. The first identifies suitably graded distributions of fibers ins...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تهران 1340

چکیده ندارد.

Journal: :Current rheumatology reports 2005
Boudewijn Van Houdenhove Ulrich Egle Patrick Luyten

This paper focuses on recent evidence of etiopathogenetic links between fibromyalgia and life stress. From an etiologic point of view, studies concerning the role of adverse life events, personality and lifestyle factors, post-traumatic stress, and negative childhood experiences are reviewed. From a pathogenetic point of view, neurobiologic links between stress and fibromyalgia symptoms, notabl...

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