测试性技术的发展综述

测试性（Testability）又称可测试性，是指产品能被及时并准确地确定其状态（可工作、不可工作或性能下降）。并隔离其内部故障的一种设计特性。它始于20世纪60年代，于70年代在国外受到重视并得到迅速发展。由于科学技术的进步．特别是计算机技术和大规模集成电路的广泛应用，     

微波消解——原子荧光测定食品中的铅

建立了一种测定食品中微量铅的方法一微波消解一原子荧光光谱法,优化了酸度、硼氢化钾和基体改进剂浓度的分析条件,该方法简便、灵敏,对样品的测定得到了满意的结果。     

单元重要度在可靠性工程中的应用

随着科学技术的发展，产品、设备和系统的复杂程度越来越高，设计工作不可能一次完成，而可靠性改进是一个经常性的工作，因此，对产品、设备和系统（以下简称为系统）可靠性的分析就显得越来越重要。对于一个由很多部件组成的系统我们会在这个系统的设计、改进和运行等方面提出很多问题，例如：     

线形可重叠的m-consecutive-k-out-of-n:F系统可靠性和单元重要度研究

线形可重叠的m-consecutive-k-out-of-n:F系统可应用于模式识别、通讯系统、生物信息学等,该系统由顺序排列在一条线上的n个单元组成,系统的失效准则为系统中存在m个失效片断,每个片断由连续k个失效单元组成.为了获得线形可重叠的m-consecutive-k-out-of-n:F系统可靠性指标,本文应用马尔科夫链法对该系统进行了研究,在给出可靠度计算公式的基础上,进一步给出系统中每一个单元的重要度计算公式,从而为系统优化设计提供依据.     

Further Study on a Virtual Age Repair Model

A new virtual age repair model with non-uniform aging speed is presented on the basis of Kijima classical virtual age repair models which can be viewed as of uniform aging nature. In this model are included three types, of perfect, of imperfect and of minimal, all having a non-uniform aging speed. Formulas of expected count of repair and length of working time of these three models are derived, and numerical examples are also given to illustrate and verify obtained theoretical indices. As an extended work, a sketchy model of maintenance time of the non-uniform aging virtual age repair model is discussed. Overall, the three models discussed in the paper, each with non-uniform aging speed, are expansions to existing virtual age repair models, relevant formulas given here are new results, and the systems introduced are without the lifetime distribution assumption, all of which may be expected to improve maintenance work.     

Transportation Reliability Model of Package Products

A reliability model of packaged products in transportation has been built in ter ms of a generalized shock assumption. Shocks acting on products are assumed to c ome from an unexpected source following Poisson stochastic process in which each shock has a standard normal distributed response acceleration, and the transpor tation package reliability is defined as the probability that within a given tim e period, the maximal response acceleration on the packaged products does not ex ceed a specified value, i.e...     

导弹储存可用性模型与分析

对导弹在储存期间的维修性的情况给予了分析, 并建立了可用性模型.根据此模型给出了实际中常遇到的几种情况的瞬时和稳态平均可用度的计算公式.讨论了一些数值例子并绘制了相应的瞬时和稳态平均可用度的曲线.     

马尔可夫可修系统新类型故障时间分布研究

对马尔可夫可修系统趣类型故障发生时间的分布问题进行研究。应用离子通道的基础理论,采用Laplace变换的方法,给出了该分布密度函数的Laplace变换函数。分析了无条件、有条件两种情况,给出了第j个和第j-l个新类型故障发生时刻之差的概率分布密度的Laplace变换函数。通过一些数值示例说明了结论的应用。结论不仅可以用于马尔可夫可修系统的研究,对马尔可夫过程的一般理论也是一个有益扩展。     

Availability Analysis of Parallel Repairable System with Omitted Failures

The new model for parallel repairable system is introduced,and it is based on the practice problems of maintenance and the idea of Ion-Channel modeling.In the new model,repair times that are sufficiently short (less than some critical value) do not result in system failure,and such a repair interval is omitted from the downtime record.Usually,the underlying process is Markov process if the durations of working and repair time have the negative-exponential distributions,but the new system has not the Markov properties,which is worth to study.The reliability indexes such as instantaneous availability and steady-state availabilities for the new system are given through probability analysis.A numerical example is given to illustrate the results.     

Safety-Critical System Reliability Modeling and Their Analyses in Terms of Effects of Component Failure Modes

New models of safety-critical systems are built here. In these systems, when co mponents fail, different defect states have different effects, hence need differ ent ways to measure. In the models, there are two kinds of failure modes of the components: one could be called failed-safe, and the other may be named failed -dangerous. In practice, the so-called failed-dangerous components may lead a system to peril. However, failed-safe components will not. Reliability and saf ety issues are analyzed using Ion-C...