This paper presents a formulation to calculate the permissive enduring strength limit of d.
利用振型迭加法计算出了钻柱的纵向振动响应，使用改进的Ｒｉｔｚ向量法计算出了整体钻柱的固有频率和固有振型，考虑钻柱沿井深随机分布的接触摩擦阻力作用及泥浆的阻尼作用，提出了钻柱在非对称循环应力状态下的许用持久极限应力的计算公式，建立了钻柱疲劳强度条件，为钻柱动强度计算和安全评定提供理论依据。
The endurance limit is reduced for temperatures above room temperature.
温度高于室温，持久极限则降低。
Many nonferrous materials do not have a definite endurance limit.
许多有色金属材料没有确定的持久极限。
endurance strength
耐久限度, 持久力, 疲劳强度
Continuing indefinitely or for a long period of time.
持久的，不断的无期限持续或长期的
Normal ratings( pressures, temperatures, time setting, etc.) shall be durably marked.
译:正常极限.压力.温度.时间.将执久标示.
The pace of the race is too severe to be maintained for long .
比赛的速度极快,很难持久。
The pace of the race be too severe to be maintained for long
比赛的速度极快, 很难持久
The pace of the race was too severe to be maintained for long.
比赛的速度极快, 很难持久.
And it will likely be a long war.
这极可能是场旷日持久的战争。
Without correct leadership, the enthusiasm of the masses cannot be sustained.
没有正确的领导, 群众的积极性就不可能持久。
How long can a spin current retain its polarization in a semiconductor?
半导体内自旋电流的偏极化能维持多久？
Persistence of Stochastic Mutualism System and MLE of Its Parameters;
随机互惠系统持久性及其参数的极大似然估计
Continuing or lasting for an indefinitely long time.
长期的，长久的继续或保持无限长的时间的
On the question of multi-polarization, Hu said multi-polarization constitutes an important basis for the lasting peace of the world.
关于多极化问题，胡锦涛说，多极化是世界持久和平的重要基
Limit awareness is the theorotical basis of sustainable devdlopment values.
极限意识是可持续发展价值观的立论之本。
An In-depth Study on Uniform Convergence and Analyticity Kept by the Functions Defined as Limits;
一致收敛及保持极限函数分析性质的深入研究
Sustainable economic development: the relationship between growth, resources and limit;
经济可持续发展:增长、资源与极限问题之争
Predicting limit parameters of coal self-ignition based on support vector machine
煤自燃极限参数的支持向量机预测模型