基于模糊理论的缺陷检出可靠度模型

分析了缺陷无损检测可靠性的度量问题,通过大量试验数据拟合出缺陷检出率隶属度函数,构建了缺陷检出可靠度的模糊数学模型,最后对飞机机翼大梁螺栓孔退役机件的裂纹长度进行磁粉探测和JFY-1A仪器检测,采用该模型分别计算了两种检测方法在缺陷尺寸临界区间的裂纹检出可靠度,并以金相法检测结果为标准进行对比,验证了模型的有效性。     

油气管道腐蚀剩余寿命的预测方法

针对管道腐蚀诸多因素的复杂性和不确定性以及管道腐蚀剩余寿命预测的困难性．系统地阐述了在役管道的腐蚀剩余寿命预测方法。评述了灰色预测方法，概率统计方法，人工神经网络方法和可靠度函数分析四种国内外正在研究和使用的方法。这些方法对于管道操作者做出正确的管道检测、维修以及更换决策起到了重要的指导作用。     

The Philosophical Model of the Relation between Reliability and Relevance of Accounting Information

The finance is the substantial category; the accounting is the conscious category. Philosophical meaning of reliability is the characteristic embodied in the course that ideological accounting reflects the objective reality： finance. Philosophical meaning of relevance is the relation and degree of restricting, interdepending, influencing each other, interaction between ideological accounting and decision-making in the course of decision. Reliability is a foundation of the relevance, relevance is the embodiment of the reliability, they set against, unify again.     

电子产品研制过程的可靠性管理

为建立闭环式可靠性管理,本文从如何确定可靠性参数和指标开始,对如何进行可靠性预计、如何确定定时截尾可靠性鉴定试验方案{T,C}和开展软件可靠性定量评估等方面进行了讨论。     

The life-length of banknotes*

Abstract With the aid of the Bank's banknote sorting system the issue and subsequent withdrawal of f 25–banknotes on three varieties of paper have been recorded for two-and-a-half years. The aim was to measure the durability of the three paper varieties in circulation. The results of this second trial with f 25–banknotes confirm the statistical model developed previously for the first trial with f 100–banknotes. GRESHAM's Law is equally not applicable, neither to f 25–banknotes nor to f 100–banknotes. A two-parameter gamma distribution fits the cumulative fraction of banknotes withdrawn reasonably well.     

Market Reaction to Multiple Contemporaneous Earnings Signals: Earnings Announcements and Future Earnings Guidance

We examine market reactions to contemporaneous announcements of current earnings and future earnings guidance for evidence on how investors trade off relevance and reliability. Current earnings are more reliable than future earnings guidance, but future earnings guidance may be more relevant for predicting future performance. We find that current earnings are more strongly associated with announcement-period returns than concurrently disclosed future earnings guidance, consistent with investors’ relative preference for reliability. We find similar return reactions to stand-alone earnings and to earnings released with guidance. In contrast, return reactions are lower for guidance announced simultaneously with current earnings than for stand-alone guidance.     

The impact on stock prices of deferral and elimination of internal control audit requirement for small firms

This paper examines the cumulative market reaction to the events related to deferral of internal control audit requirement under the Sarbanes-Oxley Act of 2002 and its elimination under the Dodd-Frank Act of 2010 for nonaccelerated filers (small firms). We document that small firms experienced negative cumulative abnormal returns around these events; and the differences between the cumulative abnormal returns for small firms and the two control groups (accelerated and large accelerated filers) were negative and significant at the 1% level. These results support the notion that market participants value the reliability of financial information irrespective of the firm size. Within the small firms, we find no firm characteristic significantly explains the market reaction to the events considered. That is, all small firms lost market value in reaction to the events that delayed and eliminated their internal control audit requirement.     

采用COTS器件的低轨星载收发信机设计与实现

在性能、成本和可靠性的多重约束下，采用商用货架（Commercial Off-The-Shelf,COTS）器件设计了一种高性能、低成本星载收发信机。该收发信机的硬件设计不但可同时满足星地和星间应用需要，而且还具有支持多波束、多信道接入的特点。软件设计主要解决了大多普勒频偏条件下的低信噪比解调和变长以太网数据帧的高效处理等问题。地面测试结果表明，在250 kb/s ~ 14 Mb/s信息速率范围内，误比特率低于1.0×10-6时所需的解调信噪比(Eb/N0)不超过2.8 dB，发射信号误差矢量幅度不超过1.9%，高速应用时处理时延可低至3.0 ms。为降低COTS收发信机的可靠性风险，分别在元器件、电路和系统层面进行了有针对性的可靠性保证措施。该设计经过了在轨测试的验证，对其他低轨商业通信载荷的研制有一定的参考价值。     

试析提高煤炭货运铁路接触网的安全性和可靠性的措施

随着社会的不断发展,其对于煤炭的需求量也越来越大。煤炭开采完成以后,通常需要通过货运铁路将其运出。所以,保证煤炭的供应,不仅要保证煤炭的开采,同样要保障煤炭的运输。对于煤炭货运铁路来说,接触网是至关重要的组成部分,是保障货运铁路运行的安全性和稳定性的重要环节。因此,论文重点分析了如何有效提高煤炭货运铁路接触网的安全性和可靠性,希望能够为有关工作人员提供一定的参考和借鉴。     

提高采煤机截齿可靠性和寿命的途径

从截齿的制造质量、材料、几何形状和参数等方面,分析截齿的可靠性和寿命的关键影响因素。