货运通道控制系统设计与实现

本文介绍了一种应用于出口加工区的货运通道控制系统的设计思路与实现方法。该系统作为出口加工区的卡口控制管理系统的前台部分,主要实现对过往车辆的集装箱号与电子车牌的识别、数据查验比对和外围设备控制等功能。     

基于测度贴近度的电子剪切散斑轮胎检测

本文把测度贴近度的概念引进到电子剪切散斑检测中,提出了一种基于测度贴近度的条纹形成算法。该算法大大地消除了条纹可见度对光照强度的依赖,提高了电子剪切散斑无损检测对工业环境的适应性,并且该算法可以在条纹产生的同时对其进行滤波,减轻了后续工作。本文从数学分析和实验两个角度证实了该算法的以上特点。     

基于验证码的证件防伪系统开发与研究

针对现在普遍存在的假证猖獗的问题。提供一种方便廉价的证件加密与验证的证件防伪技术。采用这种技术用户可以通过本地计算机运行的验证软件系统就可以验证各种证件的真伪。     

Web系统性能测试及优化

讨论了Web系统的性能测试方法和测试工具。并在一个Web系统的实例中指明了如何运用这些工具和方法进行测试以及对测试结果的分析。最后提出了对Web系统性能进行优化的方法。     

一种面向电冰箱测试的计算机网格系统

介绍了一种电冰箱测试计算机网格系统。利用该网格系统，把企业遍布在全国、分布在Internet上的各电冰箱测试系统，整合为一台虚拟计算机上的电冰箱测试系统，实现整个企业冰箱测试的统一监控、查询、统计分析，为企业冰箱质量的宏观控制提供可靠依据，给电冰箱生产相关企业提供了一种计算机网格应用模型。     

Testing process performance based on capability index Cpk with critical values

Process capability index C_pk has been widely used in the manufacturing industry as a process performance measure. In this paper, we investigate the natural estimator of the index C_pk, and show that under the assumption of normality its distribution can be expressed as a mixture of the chi-square and the normal distributions. We also implement the theory of hypothesis testing using the natural estimator of C_pk, and provide efficient Maple programs to calculate the p-values as well as the critical values for various values of -risk, capability requirements, and sample sizes. The behavior of the p-values and critical values as functions of the distribution parameters are investigated to obtain tight critical values for reliable testing. Based on the test, we develop a simple and practical procedure for in-plant applications. The practitioners can use the proposed procedure to determine whether their process meets the preset capability requirement, and make reliable decisions.     

非线性光学测试装置及其初步应用

研制了非线性光学测试装置 ,文中给出了基本原理 ,测试装置方框图和部分初步应用结果。     

维氏硬度试验中测量不确定度的评定

介绍了硬度测量不确定度的原理和方法。利用无偏差估计方法和考虑硬度计偏差的方法对维氏硬度试验中的测量不确定度进行了评定。并对两种方法评定的不确定度结果做了比较。     

Fracture mechanisms and failure processes at stiffener run-outs in polymer matrix composite stiffened elements

This paper describes the fractographic analyses of three stringer run-out designs which had been loaded to failure in tension. The main aims of the investigation were to deduce the failure processes in the elements, and to characterise the effect of local geometry of the stringer run-out on the failure process. The analysis showed that the critical failure mechanism in the elements was the development of +45° ply splitting at the skin surface, initially under mode I dominated intralaminar fracture. However, as these splits grew beneath the stringer foot, the mode II component increased. This led to mixed-mode delamination growth, extending parallel to the +45° ply, at the skin/adhesive interface. Subsequently, the delamination migrated through the skin via ply splits, ultimately reaching the interface between the second and third (−45°/0°) plies, in which it remained until catastrophic failure.

Extending and tapering the stringer foot led to shifting of the site of the +45° ply splitting; this was attributed to in-plane tensile stresses in the skin being inhibited in the modified designs. The reduced out-of-plane support on the stiffener foot in the modified designs led to an increase in the mode I component at the delamination from the stringer tip. It also led to an increase in the degree of multi-plane delamination growth. Based on the fractographic observations, recommendations for modelling the elements were suggested.