疲劳

Based on the finite element analysis software ABAQUS, the rotary fatigue life of the aluminum ahoy wheel is simulated. The initiation point of the fatigue crack and its maximum stress are obtained.

该文运用有限元分析软件ABAQUS，对某铝合金车轮旋转弯曲疲劳寿命进行了仿真分析，得出易于产生疲劳裂纹的应力集中点及其最大应力值。

Little is known about the causes of fatigue in cancer patients, and there is a "profound communication gap" between doctors and patients regarding cancer-related fatigue, Arndt and colleagues write.

对引起癌症患者疲劳的原因我们知之甚少，在医师与癌症患者之间对癌症－相关性疲劳存在着"深深的沟通代沟"，Arndt和他的同事写道。

Caffeine - A derivative of coffee, is an efficient arouser of central nervous system capable to drive away fatigue, and improve renal circulation. Its stimulation on the cerebral cortex activates Neurotransmitter receptors in the cell membrane; the adenylyl cyclaseactivated on the other surface of the cell catalyzes Adenosine Triphosphate, forming Cyclic adenosine monophosphate, and thus set off series of bio-chemical reactions, like increase of passionate feel, prompt recovery from fatigue after working etc..

咖啡因—由于咖啡本身具有兴奋神经中枢，消除疲劳，增加肾脏血流量的作用，通过对大脑皮层的刺激，使神经递质作用于细胞膜受体，激活了膜另一侧的腺苷酸环化酶，被激活的腺苷酸环化酶催化三磷酸腺苷环化酶，被激活的腺苷酸环化酶催化三磷酸腺苷形成环磷酸腺苷，从而引起一系列生化反应，如增加愉快感和消除事后疲劳等。

Fatigue damage once invalidated railway bridge, fatigue crack ever resulted in collapse of artesian well desk in ocean.

疲劳损伤曾使铁路桥梁失效，疲劳裂缝的存在使海洋钻井台倒塌倾覆，酿成悲剧。

Methods Presenting the problems of the examination and the treatment aimed at the asthenopia and analysing the way that how to use evidence-based medicine in the examination and the treatment of the anthenopia.

提出视疲劳检查与治疗中存在的问题，分析如何把循证医学应用到视疲劳的检查和治疗中。

The experimental results illustrate that at 10 6---10 7 cycles regime, there is no horizontal asymptote in fatigue S--N curves for smooth specimens, so the conventional fatigue limit disappears.

结果表明，它们的光滑疲劳试样S--N曲线在10 6---10 7周期范围内无平台出现，疲劳极限消失。

The second order asymptotic formulation for reliability analysis of parallel systems is employed in calculating the fatigue failure probability of the failure path of the system.

由于结构系统的疲劳破坏是一个受到大量不确定因素影响的现象，因此运用结构可靠性分析的基本理论和方法，对结构系统进行疲劳可靠性分析十分必要。

The rule that governs the moving of fatigue sources from the surface to the subsurface and again to the surface and its influence on the strengthening effect of shot peening are discussed.

探讨了疲劳源由表面进入内部又返回表面的规律性，及其对喷丸强化作用的影响，并提出了内部疲劳极限和表面疲劳极限的概念。

From all the work a set of complete methods of analyzing and calculating fatigue reliability of structure systems are put forward. The fatigue reliability of structure systems can be calculated by searching failure modes and using the series-wound model composed of the failure modes.

由此针对结构系统疲劳破坏的特点，本文提出了一套完整的结构系统疲劳可靠性的分析和计算方法，该方法通过搜索结构系统的主要失效模式，应用失效模式组成的串联模型计算结构系统的疲劳可靠性。

It is widely concerned in fatigue of concrete structures. In this paper, concrete triaxial compression fatigue experiments and tension-compression fatigue experiments with constant confinements in two lateral directions have been carried out using a self-modified loading apparatus. Based on the analysis of the test data, the quantitative principles of concrete fatigue deformation and the calculation method of fatigue strength are determined.

混凝土结构的疲劳是一个广为关注的问题，本文针对这一问题结合国家自然科学基金项目——混凝土多轴变幅疲劳破坏准则(50078010)的研究，利用自制的试验加载装置完成了两向定侧压约束下混凝土三轴受压、三轴拉-压等幅和变幅疲劳试验，对试验结果进行了分析。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。