可靠性

In SONET, the basic Bellcore reliability criterion is an end to end two way availability of 99.98% for interoffice applications (0.02% unavailability or 105 minutes/year down time).

SONET中，基本贝尔通信研究所可靠性标准为端到端双向99.98%可靠性，用于局间应用（0.02%非可靠性或每年不可用时间为105分钟）。

First of all, the structural analysis under the action of random loads is carried out and the mean value and variance of all joint's displacement and bar's stress in the structure are obtained by means of three fundamental equations (equilibrium, physical and geometric) in structural mechanics, as well as the property of moment of random variable.

通过引入可靠性安全系数，并利用结构力学的三个基本方程，将结构的位移和杆件应力可靠性约束等价显示化为设计变量的线性函数，使原基于可靠性的优化模型转化为常规的序列线性规划问题，利用修正的单纯形法求解。

In view of the reliability characteristics and impact factors of mining equipment,this paper builds the reliability life indicators for hydraulic support system,and calculated the reliability life by the membership function method.

针对综采设备可靠性特点及其影响因素，构建了液压支架的可靠性寿命指标体系，并采用隶属度函数方法进行了可靠性寿命的计算，其计算结果与生产实际有较好的一致性。

From the method presented in the paper, people can make decision in practice. 5. A software reliability model is presented with Markov process of control and matrix theory for object-oriented multi-modules software system.

以指导人们运用软件可靠性模型对软件现有的可靠性水平进行评估及预测软件将来的可靠性的变化情况，进而指导人们作下一步的决策。

This method is based on the weight allocation method. Through the introduction of the unascertained information into the matrix of weight coefficients, the unascertained model for the reliability allocation of spaceborne antenna deployment mechanism is built.

在综合评分为权的系统可靠性加权分配法的基础上，将未确知信息引入可靠性分配的权系数矩阵中，建立了星载天线展开机构系统可靠性分配的未确知模型。

This article introduces a calculating formula of the passing reliability coefficient of the high-speed rotating moment arm of the combined gear shaft without keys, analyses the factors which impair the reliability, and presents methods which can be used to improve it.

本文介绍了高速无键齿轮联轴节转矩传递可靠性系数的计算式、影响可靠性因素分析，以及提高可靠性的途径。

The semi-low normal distribution membership function of fatigue limit is determined, and the anti-fatigue fuzzy reliability compute formula of rotor is deduced. The fuzzy reliability model of rotor anti-fatigue is set up. Taking an internal shaft of the rotor of aero electric generator for an example, its reliability design can be realized by adopting the anti-fatigue reliability design theory presented in the dissertation.

首次确定出了疲劳极限降半正态分布形式的隶属函数，推导出了转轴抗疲劳的模糊可靠度计算公式，建立了转轴抗疲劳的模糊可靠性模型；以航空发电机转子内轴为例，对其进行了抗疲劳的可靠性设计，并用本文建立的抗疲劳的模糊可靠度计算公式，对其进行了模糊可靠性校核。

In order to determine the convergence of the line samplingbased reliability sensitivity method,the variance and the variation coefficient were derived for the reliability sensitivity estimation based on the line sampling.

为判别线抽样可靠性灵敏度分析的收敛性，推导了线抽样可靠性灵敏度估计量的方差和变异系数的计算公式，近似计算了线抽样可靠性灵敏度在给定置信度下的置信区间。

In order to determine the convergence of the line sampling -based reliability sensitivity method,the variance and the variation coefficient were derived for the reliability sensitivity estimation based on the line sampling .

为判别线抽样可靠性灵敏度分析的收敛性，推导了线抽样可靠性灵敏度估计量的方差和变异系数的计算公式，近似计算了线抽样可靠性灵敏度在给定置信度下的置信区间。

In order to compare the convergence of the importance sampling based reliability sensitivity analysis and Monte Carlo based reliability sensitivity analysis, the variance and variation coefficient of the reliability sensitivity assessment are derived in this contribution.

为了比较重要抽样与直接Monte Carlo方法在分析可靠性灵敏度时的收敛性，推导可靠性灵敏度估计量方差和变异系数的计算公式，近似计算重要抽样可靠性灵敏度估计量在给定置信度下的置信区间。

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。