The effect of modifiers on the stability of a vinyl acetate/ethylene copolymer dispersion

This paper examines the effect of modifiers on the stability of a vinyl acetate/ethylene copolymer dispersion adhesive upon aging. Eighteen common modifiers were added to a well-characterized vinyl acetate/ethylene copolymer dispersion (Dur-O-Set^® E-150) in known concentrations and dry-film samples were subjected to 16–17 years of dark aging and seven to eight years of light aging. Yellowing, pH, gloss, swelling, cohesive strength, and flexibility were monitored for changes upon aging. Generally, the neat Dur-O-Set^® E-150 (no additives) was found to become acidic on aging, but was fairly resistant to yellowing. It also swelled substantially in toluene, was of high gloss, medium strength, and flexible, and remained so on aging. No modifier was found to improve these properties. Various solvents, wetting agents, and thickeners did not alter the properties by much, while plasticizers, freeze-thaw stabilizer, glycerin, and certain fillers had a more negative effect.     

基于LabWindows/CVI的随机相关辨识

简要介绍了一种基于Labwindows/CVI下的随机相关辨识的方法,实现了用虚拟仪器设计系统辨识仿真仪．     

Stepping out: collaborative research across disciplines

This paper offers the experiences and insights of two faculty members, located in two separate disciplines, as they engaged in collaborative research. While knowledge created by stepping out and reaching across disciplines reflects the reality of an increasingly complex world, their experiences highlight both the benefits of a supportive collaborative partnership as well as the risks and discomfort experienced without tangible discipline support, when researchers stray too far from their home discipline. While transparency and attention to process is critical to all researchers engaged in collaborative partnership, its necessity is heightened when venturing beyond the territory of familiar disciplines.     

谈义乌市公示语的英译

良好的国际化语言环境是国际化城市建设的保证。义鸟市公示语英译还存在着浮于表面的解读、选词欠地道、简单的字字对应、不规范的书写等不足。针对这些问题，建议采取建立行政管理机构、推行翻译人员持证上岗制度、加强公众舆论监督等具体措施。     

地被植物在园林绿化中的应用

地被植物是城乡绿化中不可缺少的重要组成部分,对于提高绿地景观效果,维护生态平衡和保护环境具有十分重要的意义。本文通过对植物地被的认识,对我国地被植物进行历史回顾和现状分析,探讨其在园林绿化中的应用。     

中学生肥胖症与营养的关系研究

运用资料分析法，对我国13—18岁男女中学生1995年和2000年二次体质调研结果中形态发展指标及其派生指标进行动态分析，结果表明：过去5年间，我国中学生身体形态水平总体呈上升趋势；但营养过剩状况成为威胁学生健康的常见营养问题．因此，建议有关部门采取有力的干预措施，改善我国中学生的营养状况，促进学生健康成长．     

用几何画板辅助函数列一致收敛性问题的研究

利用几何画板,通过描绘函数列的图像和使用动画功能,可以使函数列一致收敛问题由抽象到具体,由现象到本质,由局部到全体,化抽象为直观,化难为易,帮助我们充分理解函数列一致收敛的思想,牢固掌握函数列一致收敛性的判别方法,深刻理解函数列在不同区间上所体现的性质。     

真善美的放歌--钱志富诗歌印象

作为当今诗坛一个默默的耕耘者 ,钱志富的诗显示出了自己独特的个性魅力。其中最突出的特征是其朴素平实的语言中所蕴涵的极其丰富奇特、跨越多层视野的想像和对题材的精心把握、诗歌修辞的营造以及对现实和理想的深刻思索。诗人从充满诗意的生活经验中所获得的对生活的外在感受和内在要求是其诗歌生命长盛不衰的最大源泉     

剖析双绞线标准

本文从双绞线的工作原理出发，介绍了基于RJ-45的直通线和交叉线的制作标准及其与各种设备的连接方法。剖析双绞线标准，以利于掌握规律，并正确使用标准，以保证网络的正常运行，最终推进网络技术的发展。     

Random vibration analysis of switching apparatus based on Monte Carlo method

The performance in vibration environment of switching apparatus containing mechanical contact is an important element when judging the apparatus’s reliability. A piecewise linear two-degrees-of-freedom mathematical model considering contact loss was built in this work, and the vibration performance of the model under random external Gaussian white noise excitation was investigated by using Monte Carlo simulation in Matlab/Simulink. Simulation showed that the spectral content and statistical characters of the contact force coincided strongly with reality. The random vibration character of the contact system was solved using time (numerical) domain simulation in this paper. Conclusions reached here are of great importance for reliability design of switching apparatus.