双曝光散斑干涉测温

本文以散斑干涉原理为基础,探讨了双曝光干涉测温的光路设计问题,并导出二维温度场的计算公式。     

双片玻璃互相粘接的实验研究

利用两片玻璃片加热软化而发生粘接的实验,成功地进行了玻璃烧结特征温度的测量。报告了实验中双片的粘接过程及现象。     

对小场地少器材进行田径教学方法的研究

采用文献综述,调查分析的方法,对普通中小学在小场地少器材的条件下进行田径项目的教学进行了研究。在场地合理利用,替代器材的利用方面,以及教学方法的选择上提出了建议。     

A 14-h night-shift in the control room of a fire brigade

All 29 operators in the control room of a fire brigade performed test sessions during work and leisure time at 2-h intervals on a day with a 14-h night-shift, a day off and a day with a 10-h morning shift. The test sessions consisted of a visual search choice reaction time test and two Sternberg memory search tests (1 or 5 letters had to be memorized). Furthermore, the operators recorded their oral temperature and their subjective alertness before each test session. The subject also kept a diary of work and sleep times for 14 days. The circadian rhythm of body temperature was hardly changed by a single night-shift. Parallel to the body temperature, the subjective alertness fell significantly during the night-shift reaching a minimum value at 06:00 h. The mean reaction times increased non-significantly at the end of the night-shift and the results of the two Sternberg memory search tests showed no significant trends. The sleep of the operators after the night-shift was on average reduced to 5 hs 34 min. The results of subjective rating of alertness and reaction time test are interpreted as effects of the combined influences of circadian rhythmicity, sleep loss and time on professional task. Most results support the conclusion that a 14-h night-shift without extensive breaks is not acceptable.     

砖混楼房墙体裂缝的探析

砖混结构房屋常见的问题就是墙体裂缝问题,即由于温度收缩引起的墙体裂缝以及由地基变形引起的墙体裂缝。现对裂缝产生的原因和防治措施进行一下探悉。     

某地下车库工程裂缝分析与处理

某地下车库工程出现裂缝,通过对裂缝产生原因的分析,提出裂缝处理措施,为今后解决此类裂缝问题提供一定的参考.     

超临界1000 MW汽轮机高压缸温度场及应力分析

应用有限元分析程序分别计算分析了超临界1 000 MW汽轮机高压内外缸稳态运行时的温度场、热应力、机械应力及综合应力,并将高压内外缸分别计算的结果与高压内外缸合在一起进行计算的结果进行了比较.得出了该汽轮机高压缸较全面的强度数据,为汽缸的安全性评定和寿命预测提供了技术依据.     

民族精神的伟大胜利--纪念抗日战争滇西缅北战场胜利六十周年

抗日战争滇西缅北战场是第二次世界大战的重要组成部分,对世界反法西斯战争的胜利作出了巨大贡献。中国人民,尤其是滇西军民,不怕牺牲,英勇奋战,为滇西缅北抗日战场的胜利,在保卫祖国,保卫东南亚、粉碎日本军国主义称霸亚洲野心的斗争中,谱写了惊天地泣鬼神的壮丽篇章。滇西缅北战场的胜利是弱国打败强国的典范。中国人民和中国军队在滇西缅北战场之所以能够取得巨大胜利,除了经济、政治、军事、外交诸方面的原因外,更重要的是我们继承和发扬了中华民族的爱国主义的光荣传统和不怕牺牲敢于斗争的精神。滇西缅北战场的胜利,是中华民族精神的伟大胜利。中华民族精神在抗日战争滇西缅北战场的主要体现是:不怕失败愈挫愈奋的顽强意志,不畏强敌以死报国的民族气节,宁为玉碎拼死奋战的英雄气概,万众一心共御外侮的民族团结精神,联合世界反法西斯力量的友好合作精神。     

Managing Potential Health Risks from Electric Powerlines: A Decision Analysis Caught in Controversy

Over the past 20 years, several epidemiological studies have found an association between exposure to electromagnetic fields (EMFs) and health effects, including childhood leukemia and adult brain cancer. However, experts strongly disagree about whether this association is causal and, if so, how strong it is. In this article, we examine several alternatives to reduce EMFs from sources of the California power grid, including undergrounding distribution and transmission lines and reconfiguring or rephasing lines. The alternatives were evaluated in terms of the potential health risk reduction, cost, impacts on service reliability, property values, and many other consequences. Because of the uncertainty about an EMF-health link, the main effort was to determine the sensitivity of the decisions to the probability and seriousness of an EMF hazard. User-friendly computer models were developed to allow stakeholders to change the model assumptions and parameters to analyze the impacts of their own assumptions and estimates on the decision. The analysis clearly demonstrated that only four of the many concerns raised by the stakeholders could make a difference in the decision: health risks, costs, service reliability, and property values. Whether undergrounding, moderate alternatives for EMF reduction, or no change was the best decision depended on a few key factors, including the probability that EMF exposure is a hazard, the severity of this hazard, how the EMF reduction measures are financed, and the impacts on property values. While the analysis did not resolve the EMF issues, it showed that even in the most controversial settings, a little analysis goes a long way to clarifying the issues and to focus the debate.     

"救济精神饥荒"--梁启超三界革命论的现代性追求

20世纪初,梁启超提出文界革命、诗界革命、小说界革命等变革文学的主张。其变革主张是建立在进化论、人性论、文学宗教论以及文化化合等现代理论观念基础之上的,其理论目标是创建适应新时代、立足大众、面向世界、实现人生艺术化的中国现代文学。