نتایج جستجو برای: fatigue test machine
تعداد نتایج: 1109447 فیلتر نتایج به سال:
The fatigue-limit model studied here contains an unknown fatigue limit parameter. Under this model, specimens tested below this fatigue-limit level of stress will never fail. The model also allows the standard deviation of fatigue life to be a function of stress. Researchers can use this model to describe the standard deviation and stress dependence in fatigue data. To illustrate its applicatio...
objectives: the purpose of this study was to evaluate the resistance to fatigue failure of five different nickel-titanium rotary files in three different curved trajectories. materials and methods: a total of 150 neoniti a1, race 25.06, mtwo 25.06, twisted file 25.06 and protaper next x2 files with the tip size of 25 were tested (n=30 for each group). three groove types simulating curved canals...
BACKGROUND The definition of Chronic Fatigue Syndrome (CFS) overlaps with definitions of insomnia, but there is limited knowledge about the role of insomnia in the treatment of chronic fatigue. AIMS To test if improvement of insomnia during treatment of chronic fatigue was associated with improved outcomes on 1) fatigue and 2) cortisol recovery span during a standardized stress exposure. ME...
Abstract Object: one of the most common and disruptive symptoms experienced by cancer survivors is cancer related fatigue. This symptom can persist many years after cancer diagnosis, leading to reduced performance, quality of life, and significant socioeconomic outcomes. Therefore, the aim of this study is to answer the question of whether mindfulness –based stress reduction on cancer related f...
Background : Multiple sclerosis (MS) is a chronic progressive disease on the central nervous system with signs and symptoms such as fatigue and reduced functional capacity. The purpose of this study was to assess the effect of core stability exercises on functional capacity and fatigue in patients with multiple sclerosis. Materials and Methods: The present quasi-experimental study used a pre...
introduction: this study investigated the fatigue and fracture modes of race and protaper rotary instruments. materials & methods: fatigue resistance was evaluated by rotating the files 30 ° or 60 ° and with 2 or 5mm radius of curvature. race taper 06 size 25 and protaper f1 files (n=40) were used. the number of rotations to failure was analyzed by two-way anova and independent sample t-tes...
BACKGROUND AND PURPOSE There is little information on how to best measure poststroke fatigue. Our aim was to identify which currently available fatigue scale is most valid, feasible, and reliable in stroke patients. METHODS Fatigue scales were identified by systematic search, and the 5 with the best face validity were identified by expert consensus. Feasibility (ie, did patients provide answe...
Abstract This work investigated effect of Cu addition on fatigue crack growth rate and fracture morphology Al-1.2Mg-1.2Si alloy by test machine Scanning Electron Microscope. It revealed that the these alloys was related to content. When content 0.18, there did no significant influence ability. But when raised 0.37, cracks resistance significantly reduced. However, not affect mode alloys. The du...
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