金属构件的损伤断裂与抗力衰减分析

现有的结构力学分析都假设结构为完好无损，然而结构在初始状态或使用过程中总存在各种损伤，而且损伤在使用过程中会不断积累和加剧。损伤不但缩短结构的使用寿命，而且引起结构力学性能下降。本文着重研究了具有宏观裂纹构件的强度和刚度随损伤发展的衰减规律；分析了平面应力、平面应变及弹塑性情况下带裂纹构件的强度衰减，提出了构件剩余抗力的计算方法；基于能量原理，推导了带裂纹构件的刚度；应用本文的方法分析了一个三杆结构，分析结果显示了裂纹引起的构件强度和刚度的变化对结构承载力和可靠度的显著影响。     

六相双Y移30°感应电机稳定性分析

以六相双Y移30°感应电机为对象,从建立电机数学模型入手,导出状态空间方程,应用特征值稳定判据分析多相感应电机的稳定性。该方法适合线性化的系统在稳定工作点附近微小振动的稳定性分析。针对电机定、转子参数和转动惯量的变化,对系统稳定性进行实例计算和分析。     

Apriori算法的三种优化方法

通过对Apriori算法的思想和性能的分析,认为Apriori算法存在以下三点不足:(1)由K阶频繁集生成K+1阶候选频繁集时,在K+1阶候选频繁集中过滤掉非频繁集的策略值得进一步改进;(2)连接程序中相同的项目重复比较太多,因而其效率值得进一步改进;(3)在回扫数据库时有许多不必比较的项目或事务重复比较。根据上述三点不足,提出了相应的三种优化策略来优化Apriori算法,得到一效率较高的改进Apriori算法。     

软件内建自测试中的模板库及测试路径分析

软件内建自测试是一种新型的软件测试方法，该文研究了其中的模板库设计和测试路径执行的问题。首先介绍系统的模板库定义及设计，以及它的主要特点，然后介绍了一种将模板库中程序块的执行路径二叉化的方法，使生成的测试用例具有高的路径覆盖率。     

PKI结构下公文交换系统安全体系研究

介绍了PKI框架下多种安全技术的应用，着重介绍了IP网络加密机、加密卡等硬件加密设备的实现原理和技术所构成的PKI结构下的公文交换系统安全体系。     

程序插装技术在软件内建自测试中的应用

软件内建自测试(Build-In-Self-TestforSoftware)思想来自于硬件内建自测试。其中测试点设置是软件内建自测试系统的核心模块之一,主要借助程序插装技术收集动态测试信息和控制程序流程。该文具体讨论了插装库的设计、实现以及测试点植入被测程序的过程。     

Tribological behavior of sialon ceramics sliding against steel lubricated by fluorine-containing oils

The friction and wear behavior of sialon ceramics sliding against steel and lubricated by perfluoropolyethers (PFPE), tetrakis (3-trifluoromethylphenoxy)-bis(4-fluoro-phenoxy)-cyclotriphosphazene (X-1P) and ionic liquid (1-methyl-3-octylimidazolium tetrafluoroborate, coded as L108) were investigated. It was found that the three fluorine-containing lubricants reduced friction coefficient and wear volume effectively. The effectiveness of the three lubricants in reducing wear volume could be ranked as L108>X-1P>PFPE. The antiwear films mainly consisting of organic oxyfluoride or carbonfluoride species and silicon fluoride are all observed for the three lubricants, while the degradation of PFPE during friction might account for the higher wear volume therewith. The lowest friction coefficient 0.065 was recorded for L108 under load of 0.5–400 N. This is dependent on the physically adsorbed ionic liquid on the rubbing surface and the formation of BN under the harsh conditions.     

锈蚀钢筋与混凝土间黏结性能试验

为研究锈蚀对钢筋与混凝土间黏结性能的影响,制作20个中心拉拔试件.通过电化学加速锈蚀得到理论锈蚀率为0%、0.5%、1%、2%、5%的拉拔试件,完成了不同锈蚀率下钢筋与混凝土的拉拔试验.从钢筋几何外形特征与混凝土强度在锈蚀过程中变化的角度分析了锈蚀率对极限黏结强度的影响,以割线刚度的方法定量研究了锈蚀率对黏结刚度的影响.阐述了锈胀裂纹、黏结刚度及试件破坏模式随锈蚀率变化的规律.试验结果表明:随着锈蚀率增大,钢筋与混凝土间的黏结强度、黏结刚度呈现先增大后减小趋势.黏结刚度的退化与锈胀裂纹的出现具有一定相关性.通过整理国内外学者黏结强度退化数据,得到了两段式黏结强度退化试验模型及一定程度上可供工程参考的黏结强度退化保守模型.最后,基于两段式黏结-滑移模型得到了不同锈蚀率下钢筋与混凝土间黏结-滑移本构模型.     

A cross‐cultural comparison of colour emotion for two‐colour combinations

Psychophysical experiments were conducted in the UK, Taiwan, France, Germany, Spain, Sweden, Argentina, and Iran to assess colour emotion for two‐colour combinations using semantic scales warm/cool, heavy/light, active/passive, and like/dislike. A total of 223 observers participated, each presented with 190 colour pairs as the stimuli, shown individually on a cathode ray tube display. The results show consistent responses across cultures only for warm/cool, heavy/light, and active/passive. The like/dislike scale, however, showed some differences between the observer groups, in particular between the Argentinian responses and those obtained from the other observers. Factor analysis reveals that the Argentinian observers preferred passive colour pairs to active ones more than the other observers. In addition to the cultural difference in like/dislike, the experimental results show some effects of gender, professional background (design vs. nondesign), and age. Female observers were found to prefer colour pairs with high‐lightness or low‐chroma values more than their male counterparts. Observers with a design background liked low‐chroma colour pairs or those containing colours of similar hue more than nondesign observers. Older observers liked colour pairs with high‐lightness or high‐chroma values more than young observers did. Based on the findings, a two‐level theory of colour emotion is proposed, in which warm/cool, heavy/light, and active/passive are identified as the reactive‐level responses and like/dislike the reflective‐level response. © 2010 Wiley Periodicals, Inc. Col Res Appl, 2012     

Request for existing experimental datasets on colour emotion and colour harmony

The Technical Committee 1‐86 of the International Commission on Illumination on “Models of colour emotion and harmony” is requesting the submission of datasets for use in developing new models of colour emotion and colour harmony. The data should be submitted to the TC Chair, Dr. Li‐Chen Ou at the National Taiwan University of Science and Technology. © 2012 Wiley Periodicals, Inc. Col Res Appl, 2012