结构强度储备的评估及结构维修过程的跟踪决策

本文提出了已建成结构在服役过程中构件的强度储备比和结构整体的强度储备比的概念和定义,它们都是随结构使用和维修过程而变化的时间的函数。我们建议以实际的强度储备比作为构件和结构服役安全度的表达方式,给出了构件和结构强度储备比的具体评定方法,并以结构整体的强度储备比作为控制参数决策结构的维修过程,以求得结构全寿命维修的优化控制。本文所提出的方法适用于具有良好的结构重分析程序和精密细致的检测手段的工程。一般重要的结构工程,例如核电站、海上结构、航空航天设备等均具备上述条件。因而本文所提的方法非常实用,可以立即应用于重要的工程项目,具有重大的经济和社会效益。     

非正态随机变量的可靠性评价方法研究

不确定性及可靠性分析技术已广泛应用到水利及土木系统工程分析中，可靠性计算的核心之一是对随机变量进行正态转换。文中旨在对土木工程系统不确定性及可靠性分析中有着潜在应用前景的非正态随机变量的多项式正态转换方法进行研究。通过在各种条件下非正态随机变量的正态多项式转换成果之评价，发现在水利及土木工程系统可靠性分析中常用的许多分布可以保留其自身的比较好的特征。     

Comment on "Articulation of values."

This article clarifies several research issues raised in a recent article by Krieshok, Arnold, Kuperman, and Schmitz concerned with repertory grid methodology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

SMT互连组件在热循环中的可靠性预计模型

电子设备中表面安装器件和电路基板以及焊接材料的热膨胀系数差异,使得SMT互连组件在热循环条件下产生热膨胀失配,在焊接处产生热应力,在长时间的交变应力的作用下,焊接处遭到疲劳破坏而使设备工作失效,这就是SMT互连组件在热循环条件下的基本失效机理。文中还介绍了美国MIL—HDBK—217F NOTICE Ⅱ公布的表面安装连接组件可靠性预测lSMT模型。给出一系列具有实用价值的参数。     

Reliability‐based estimation of the survival of Listeria monocytogenes in chorizos

Reliability analysis is especially important when critical decisions are to be made involving potentially severe adverse consequences such as foodborne illness. Owing to uncertainty associated with the parameters controlling survival of Listeria monocytogenes in chorizo (a Mexican‐style sausage), the time needed to reduce the count by a certain number (n) of logs (t_nD) is probabilistic. In this paper the first‐order second‐moment (FOSM) method based on Taylor series expansion is used to derive the expected value and standard deviation of t_nD as function of the operating conditions (random variables) affecting survival, namely initial water activity (a_w0) of the sausage batter, storage temperature (T) and airflow velocity (F), along with their uncertainties characterised by their means and coefficients of variation. For any given n the derived t_nD probability distribution enables one to determine an estimate of t_nD for any desired level of reliability or confidence level, such as 50% (median value), 95%, 99%, etc. Among the conclusions drawn were: (i) the variability associated with T and F has a minor effect on estimating uncertainty in t_nD, whereas the reliability of t_nD estimation is greatly influenced by the uncertainty in a_w0; and (ii) the uncertainty in a_w0 has the greatest impact when a_w0 of the sausage formulation exceeds 0.90. The approach used and discussed in this paper can be applied to any survival/inactivation study to incorporate the effect of uncertainty in the various extrinsic and intrinsic parameters on the survival kinetics of the pathogen in a food system under evaluation. Copyright © 2006 Society of Chemical Industry     

OPGW的结构简析

主要对光纤复合架空地线(OPGW)的性能可靠性及生产、制造中的问题进行分析探讨     

数字电视播出系统的可靠性研究综述

数字电视播出系统的可靠性直接反映整个系统的质量优劣，是确保能否进行安全、可靠的电视播出的关键。为了保障电视播出的安全与可靠性，必须对硬盘化播控系统进行双机熬备扮和使用有RAID技术的硬盘播出系统的数据备份设计；同时还介绍了数字电视播出播出系统软件的设计要求和数字电视设备的寿命分析。     

某军用直流电源的RET方法研究

可靠性强化试验(RET)是一种新兴的试验技术,它使用在产品的设计阶段,用于快速暴露产品的缺陷和薄弱环节。以某军用直流电源为例介绍了可靠性试验方法,并对可靠性强化试验方法的优越性进行了讨论。     

THE TENSILE STRENGTH OF WATER IN DEPRESSION TANK

This paper presents the data of tensile strength of water in depression tank whichwere measured by small venturi during cavitation investigation of a series of real project models.These measurements show that in depression tank water has slight tensile strength in case of highvacuum.But it influences the incipient cavitation number.In tests we also studied the influenceof tensile strength on scale effect of cavitation models.     

从会计信息的质量特征看财务报告的改进

基于财务报告目标的实现，首先分析了会计信息的两大质量特征——可靠性与相关性。然后对传统财务报告模式的改进提出了看法：不断健全法制以提高可靠性；财务报告后增加预测性财务报表；提供更加丰富的报表附注内容等，目的是为报表使用者做决策提供相关性更强的信息。最后，针对报告的这些改进可能遇到的障碍及如何应对进行了探索和思考。