灰铸铁贝氏体等温淬火研究

研究了等温淬火热处理工艺对灰铸铁组织和性能的影响．并确定了860℃保温2h．然后在300℃保温1.5h的等温淬火工艺，在此工世条件下可获得贝氏体基体的高性能灰铸铁。     

缸体、缸盖铸件生产的总体工艺路线——车用中小型发动机灰铸铁缸体缸盖铸件生产工艺(1)

介绍发动机缸体、缸盖铸件生产的总体工艺路线.目前大多数汽车发动机铸件生产企业都采用冲天炉-电炉双联熔炼,为防止铁液晶核减少、过冷度增加、白口化倾向较大,应控制电炉熔炼温度,避免长时间过热和保温;为确保铸件尺寸精度,铸型宜采用高密度造型,也可以采用呋喃树脂砂型或PEP-SET树脂砂型.根据国内目前情况,建议主体砂芯采用冷芯工艺,而水套等部位的砂芯采用覆膜砂工艺更为稳妥可靠.     

Tribological behavior of plasma spray coatings for marine diesel engine piston ring and cylinder liner

High-temperature wear characteristics between plasma spray coated piston rings and cylinder liners were investigated to find the optimum combination of coating materials using the disc-on-plate reciprocating wear test in dry conditions. The disc and plate represented the piston ring and the cylinder liner, respectively. Coating materials studied were Cr₂O₃-NiCr, Cr₂O₃-NiCr-Mo, and Cr₃C₂-NiCr-Mo. Plasma spray conditions for the coating materials were established adjusting stand-off distance to obtain a coating with a porosity content of ∼5%. It was found that a dissimilar coating combination of Cr₂O₃-NiCr-Mo and Cr₃C₂-NiCr-Mo provided the best antiwear performance. The addition of molybdenum was found to be beneficial to improve the wear resistance of the coating. Hardness differences between mating surfaces were also important factors in determining the wear characteristics, so that it should be controlled below 300 in Vickers hardness under dry conditions. Adhesive wear accompanying with metal transfer was a dominant wear mechanism for dry conditions.     

高碳当量高强度灰铸铁的稳定生产

阐述了碳当量为3．7％～3．8％，抗拉强度为350MPa以上灰铸铁的生产措施，通过近200炉次的生产证明，适当提高碳当量，采用高温静置、低合金化及二次孕育，是稳定生产高强度灰铸铁的有效途径。     

CCD在塞曼效应中的应用及最佳灰度值的确定

用CCD观测系统取代传统的塞曼效应实验仪观测系统。对采集的图像进行分析并确定图像的最佳灰度值。不但提高了实验精度，而且缩短了实验时间。该实验方法对拓宽学生知识面，开发计算机的应用起到了一定作用，值得在其他实验中推广。     

WEB在线生成等值线关键技术研究及应用

该文主要研究了WEB环境下如何高效、稳定调用Surfer软件和在线生成等值线的关键技术,提出利用精确的命名方法解决WEB远程调用Surfer存在的问题,实现了直接在WEB网页上分析显示等值线或等值面,实现了WEB环境下在线批量生成等值线图及物理量演变的动态演示。     

模糊灰关联在QAR故障数据检测中的应用

针对传统的灰色关联故障诊断算法无法解决大样本数据的问题,提出一种基于模糊分割灰关联的QAR（quick ac‐cess recorder）故障数据检测算法。鉴于QAR数据是数据结构复杂、维数高的时间序列数据,利用模糊分割将QAR数据分割成不重叠的子序列,从中提取出待检测故障序列,计算待检测序列与标准序列间的灰关联度,根据最大关联度原则进行故障模式识别并确定诊断结果。仿真结果表明,该算法的预测结果与实际情况基本一致,具有简单可靠、诊断精度高等优点。     

适用于Android智能手机的灰度均值水印算法

提出了一种适用于Android智能手机的灰度均值数字水印算法。在嵌入阶段,将经过像素重新组织的水印图像嵌入载体图像中;在提取阶段,先提取出初始水印,再判断初始水印是否需要区域替换,如果需要,则进行区域替换,否则不进行;最后,将初始水印还原成所需的水印图像。实验表明,该算法在具有良好水印透明性的同时,对JPEG压缩、加噪声、裁剪等常见的攻击具有鲁棒性。     

An introduction to the Information Display Measurement Standard 1, the first display measurement standard from the International Committee for Display Metrology

On June 1, 2012, the Information Display Measurement Standard version 1 was released. This is the first standard from the worldwide standard group, the International Committee for Display Metrology, a standards committee within SID, and it culminates several years worth of development from many contributors at various levels. It has 26 top‐level chapters and a total over 450 sections of all parts, including over 200 measurement sections and 8 appendices that cover 133 topics of display metrology, tutorials, technical discussions, and references. Herein is an overview of the Information Display Measurement Standard version 1, including the structure of the document, tips, tricks, and hidden features, how it is maintained, support material, a breakdown of its contents, and finally, a sampling of four of the over 200 measurements. The standard is available as a free download and can be found on the International Committee for Display Metrology home page — http://www.icdm‐sid.org .     

基于灰度阈值法的煤岩界面识别研究

针对煤岩界面识别存在准确性低的问题,以颜色区分度较高的某工作面煤岩图像为例,采用边缘检测法和灰度阈值法分别对该图像进行了煤岩分割处理,结果表明,当煤岩颜色的灰度差别较为明显时,基于灰度阈值法的煤岩界面识别方案具有较高的识别准确性。