小型密闭压力容器测试系统重复性的研究

小型密闭压力容器测试（MCPVT）法是安全工程领域中近几年发展起来的、评价有机过氧化物及自反应物质受热分解反应激烈程度的新方法。pmax是MCPVT方法中用来表征自反应物质受热分解反应激烈程度的物理量之一。文中通过大量实验，研究了样品容器容积V、升温速率R及样品质量M对pmax重复性误差的影响，研究了一系列典型的有机过氧化物和自反应物质在标准实验条件下pmax重复性误差。结果表明，小型密闭压力容器测试系统重复性好，测试结果可靠，从而为MCPVT法最终成为国际上评价自反应物质受热分解反应激烈程度标准方法奠定了基础。     

罐装食品用电镀锡板的耐蚀性及其试验方法

综述了影响罐装食品用电镀锡板耐蚀性能的因素及其试验方法。     

复电阻率测井方法及其应用

复电阻率测井是以两频或多频测量地层电阻率的新方法 ,它可用来有效地识别油气层和确定水淹油层的水淹程度。简要介绍了复电阻率测井的测量原理、仪器设计。胜利油田 9口井的现场测井资料初步验证了该方法的可行性和有效性     

拟动力实验中的数值积分方法

拟动力实验方法是目前最新的抗震实验方法，它克服了振动台实验中承载力不足、拟静力实验中无法真实模拟地震过程的缺点．本文详细论述了拟动力实验中的数值积分方法，其中包括：显式方法，隐式方法以及采用于结构技术时所需的特殊教值积分方法，并对这些方法的适用范围作了介绍．     

低渗透油藏生产井关井测压时间的计算与应用

低渗透油藏的生产井压裂后，在单井试油试采过程中，压力恢复测试关井时间不同，其中有些井压力恢复曲线不能出现边界反应段，渗流不能反映地层中真实流动特征。针对这种情况，基于长庆绥靖油田塞39井区长：低渗透油藏大量试井和实际生产资料，利用现代试井解释理论，研究合理关井时间的界限及其计算方法。结果表明，当油井关井测压时间达到3倍地层径向流开始出现的时间后，利用此时的压力数据解释地层参数和地层压力，其结果的误差小于5％，同时能较准确地判断边界类型。计算的理论曲线和霍纳法解释值非常接近，对于塞39井区，若预先知道某生产井地层有效渗透率值，可从理论曲线查出压力恢复试井的关井时间，否则，建议按照该井区地层有效渗透率（大约在6mD左右），将不稳定试井测试时间控制在25d以上为宜。图4表3参14     

Techniques for estimating test length under random test

When a circuit is tested using random or pseudorandom patterns, it is essential to determine the amount of time (test length) required to test it adequately. We present a methodology for predicting different statistics of random pattern test length. While earlier methods allowed estimation only of upper bounds of test length and only for exhaustive fault coverage, the technique presented here is capable of providing estimates of all statistics of interest (including expected value and variance) for all coverage specifications.Our methodology is based on sampling models developed for fault coverage estimation [1]. Test length is viewed as awaiting time on fault coverage. Based on this relation we derive the distribution of test length as a function of fault coverage. Methods of approximating expected value and variance of test length are presented. Accuracy of these approximations can be controlled by the user. A practical technique for predicting expected test length is developed. This technique is based on clustering faults into equal detectability subsets. A simple and effective algorithm for fault clustering is also presented. The sampling model is applied to each cluster independently and the results are then aggregated to yield test lengths for the whole circuit. Results of experiments with several circuits (both ISCAS '85 benchmarks and other practical circuits) are also provided.This work was done while the author was with the Department of Electrical Engineering, Southern Illinois University, Carbondale, IL 62901.     

Energy minimization and design for testability

The problem of fault detection in general combinational circuits is NP-complete. The only previous result on identifying easily testable circuits is due to Fujiwara who gave a polynomial time algorithm for detecting any single stuck fault inK-bounded circuits. Such circuits may only contain logic blocks with no more thanK input lines and the blocks are so connected that there is no reconvergent fanout among them. We introduce a new class of combinational circuits called the (k, K)-circuits and present a polynomial time algorithm to detect any single or multiple stuck fault in such circuits. We represent the circuit as an undirected graphG with a vertex for each gate and an edge between a pair of vertices whenever the corresponding gates have a connection. For a (k, K)-circuit,G is a subgraph of ak-tree, which, by definition, cannot have a clique of size greater thank+1. Basically, this is a restriction on gate interconnections rather than on the function of gates comprising the circuit. The (k, K)-circuits are a generalization of Fujiwara'sK-bounded circuits. Using the bidirectional neural network model of the circuit and the energy function minimization formulation of the fault detection problem, we present a test generation algorithm for single and multiple faults in (k, K)-circuits. This polynomial time aggorithm minimizes the energy function by recursively eliminating the variables.     

凸非球面补偿检验的工艺球面分析解

本文从三级像差理论出发,推导了几种工艺球面检验凸二次曲面的计算公式。根据这些公式计算结果,进行了光路追迹,给出了这些公式对凸二次曲面的补偿范围;并讨论了几种特殊情况下的平面解。     

1100℃以上高温连铸板坯表面缺陷的模拟在线无损检测

高温状态下连铸板坯表面缺陷的在线无损检测在现代化的连铸坯热送－直轧工艺中对于保证铸坯的质量有着极其重要的意义。本文介绍了连铸坯高温探伤技术和相应的试验装置。采用涡流方法成功地模拟了１１００℃以上铸坯表面缺陷的动态检测，所用探头及检测设备均可在高温状态下长时间连续工作，能检测出深度为１．５ｍｍ，宽度为０．３ｍｍ，长为１０ｍｍ的表面缺陷，并能有效地抑制铸坯表面振动斑痕所产生的噪声影响。借助于计算机信号     

转向柱管承载能力的试验研究

在分析转向柱管花键部位应力集中情况的基础上,通过对某厂生产的转向柱管扭转破坏的试验研究,得到如下结论:①转向柱管的承载能力与其外花键齿与方向盘中心内花键齿之间的非接触区长度有关,以花键端部过渡圆弧的直径大小为宜;②安装方向盘总成时所施加在安装螺母上的拧紧力矩在70N.m左右时,转向柱管的承载能力最大。