寿命

At the beginning, an engineering method called semi-empirical reliability estimation method is introduced. Then, a detailed introduction of the bootstrap method, which has been widely applied to small sample reliability assessing since it was proposed in 1979, is made immediately. At last, a promoted virtual sample expanding method, that the reliability test sample size is expanded from 2-3 to 10, is proposed on the basis of predecessors research results. And the new method associated with bootstrap method is used to assess the test life lower limit in the case of logarithmic normal distribution.

首先阐述了处理极小子样可靠性评估问题较合理的一种工程处理方法—半经验可靠性评估方法，随后详细介绍了近年来在小子样可靠性评估领域发展迅速的Bootstrap方法，最后在前人研究成果的基础上提出了将样本数从n=2～3虚拟增广至n=10的虚拟增广样本推广方法，将该方法应用于服从对数正态分布的寿命总体，利用Bootstrap方法得到了试验寿命下限的估计，并与已有的半经验可靠性评估方法的结果作了比较分析。

Long working life: the standard life is 100 thousand hrs when luminous flux goes down 70%.

寿命长：光通量衰减到70%的标准寿命是10万小时。

The maintenance and renewal of agricultural machinery are explored in term of maximum principle by the application of control theory.

大型农业机械的使用寿命和在寿命周期内的保养与更新是使用者非常关心的问题。

The results show that the porosity of porous silicon increased with the increase of etched time, which lead to the decrease of minority carrier life and the increase of luminescent efficiency of porous silicon.

多孔硅的空隙度随腐蚀时间的延长而增大，这也导致了多孔硅的少子寿命的降低，从而造成多孔硅的光致发光效率随多孔硅空隙度的增大以及少子寿命的降低而提高。

The surface morphology, reflection rate and life time of minority carrier in multicrystalline silicon wafer were measured and analyzed.

通过扫描电子显微镜，Hitachi U-4100分光光度计和Semilab WT2000少子寿命仪分析了表面织构化后硅片的表面形貌、反射率和少子寿命。

Results: The values of parameters of the rate of biting human, the index of human-blood, the habbit of biting human, the ratio of multiparous mosquitoes, the gonotrophic cycle, the survival rate of every day, the expected life-span, the reproductive time of sporop...

结果：计算出中华按蚊叮人率、人血指数、叮人习性、经产蚊比率、生殖营养周期、每日存活率、预期寿命、孢子增殖时间、有传疟性蚊的比率，预期传疟寿命、媒介能量等参数值。

The experimental results indicate that collectivity of ^131 Ce is reduced relative to that of ^130Ce and it follows that deformation decreases with increase of the neutron number on the basis of systematic comparison of transition quadrupole moments for the light cerium isotopes.

精确量度形变大小的最好方法是通过测量能级寿命提取电磁跃迁概率或跃迁四极矩。为了系统研究轻Ce同位素的形状变化，我们利用多普勒移动衰减法测量了^131Ce激发态的寿命。

Estimation of the parameters included in the lifetime distribution of the individual components in a series system with independent and nonidentical components are introduced by using masked data.

在可靠性分析中，人们通常通过分析系统的寿命数据来估计该系统中各组成单元的寿命分布中的未知参数。

In the meantime, a new relation between the coefficient of variation for a normal variate and its sample size is achieved, where the probability to make mistake Ⅱ is considered 5 The probability distribution of fatigue strength at given life under large sample size determined by a new method is found to follow the log-normal distribution and normal distribution, and a new method are developed to estimate the characteristic parameters of probability distribution of fatigue strength from the probability distribution of traditional tensile properties.

根据P-S-N曲线的要求，采用概率统计方法，导出了考虑犯Ⅱ类错误的概率时获取给定精度P-S-N曲线所需的最少子样容量，引入了不同方法获取的P-S-N曲线结果是否趋同的判别标准，得到了P-S-N曲线的寿命求解法和系数求解法获得趋同结果的条件。 5）研究了大子样条件下指定寿命时疲劳强度的概率分布，并提出了根据拉伸性能的分布估算材料疲劳强度概率分布参数的一种方法。

Combined prototype tests with numberical tests, the invalid load, strengthen load and critical load are determined.

首次得到了随着锻炼载荷等级的不断提高，结构在高载荷下的过载寿命先增加而后降低的结论，即锻炼后寿命与锻炼载荷的函数关系可表为一元二次多项式。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失