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不同乳胶粉对抗裂砂浆抗裂性能的影响 被引量:7
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作者 郝先成 马保国 李廷芥 《节能》 2006年第11期19-21,共3页
通过研究不同乳胶粉不同掺量时对砂浆的压折比、耐冻融性、干燥收缩性的影响,评价国内外不同乳胶粉对砂浆的抗裂性能的改善作用;并通过SEM照片对抗裂砂浆的微观形态进行研究,研究表明国内乳胶粉可等量取代国外价格昂贵的可分散乳胶粉。
关键词 乳胶粉 抗裂砂浆 外墙外保温 ohama模型
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Effect of Modified Polymer on Crack Resistance of Mortar
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作者 马保国 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第z1期23-26,共4页
At present, the basic technical principle in China is to adopt polymers to modifying the properties of mortar so as to improve the crack-resistance of construction structures and to strengthen their water-resisting an... At present, the basic technical principle in China is to adopt polymers to modifying the properties of mortar so as to improve the crack-resistance of construction structures and to strengthen their water-resisting and climate-resisting properties as well. However, how polymer acts on anti-crack mortar is short of systematic research. Theoretical exposition of polymer mortar is basically explained by Ohama Model, which is cement slaking and polymer coating are carried on together and mutually-cross web structure interweaved with liquid and polymer coating. But anti-crack mortar has its own special characteristics because of fewer polymers mixed in it and its high viscosity. So this paper is to showing how different polymers affect its crack-resistance cannot be reflected from this theory. Vinyl-acetate ethylene (VAC/E) has been selected as representation of polymerization, whose property is modified by compounding it from some inorganic components, such as talc, CaCO3 and so on. And then the mechanics property and shrinkage of anti-crack polymer mortar is tested when different amount of polymers is added as admixture of mortar. The result indicates that, the working performance and mechanics property of the polymer mortar are worse mixed VAC/E only. It basically meets the demands for mechanics strength and working performance when mixed both VAC/E and CaCO3 While it achieves much better mechanical property and working performance than the two former when mixed VAC/E, talc and CaCO3; the result of corresponding scanning electron microscopy (SEM) of sample indicates that the internal result of the polymer mortar, compared with classical Ohama Model, has a particularity that its structure is formed by polymer coating instead of filling up the intervals among cement grains. 展开更多
关键词 crack-resistant mortar POLYMERS VAC/E ohama model
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论奥巴马政府对俄政策调整的原因及俄美关系前景
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作者 黄登学 《东北亚论坛》 CSSCI 北大核心 2011年第2期20-29,共10页
前些年,布什政府对俄罗斯奉行的"挤压、遏制及削弱"的"单边主义"政策,致使美俄关系陷入日益"冰化"的状态。奥巴马上台后,呈现出谋求修复和改善与俄罗斯关系的政策调整趋势,而美国"单边主义"政... 前些年,布什政府对俄罗斯奉行的"挤压、遏制及削弱"的"单边主义"政策,致使美俄关系陷入日益"冰化"的状态。奥巴马上台后,呈现出谋求修复和改善与俄罗斯关系的政策调整趋势,而美国"单边主义"政策的挫败、俄罗斯方面的积极"抗争"以及美俄势力此消彼长的发展趋势等则是美国对俄政策调整的主要原因;以美国对俄政策调整为契机,美俄关系有望进入一个"合作加强、对抗减少"的"建设性"新阶段,然而,由于一系列制约性因素的存在,俄美关系的实质性改善仍任重而道远。 展开更多
关键词 奥巴马 美国 俄罗斯 政策调整 原因 俄美关系 前景
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Then and Now: A Content Analysis of Media Used in the Presidential Election Campaigns of Kennedy and Obama
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作者 Zack Stiegler Mary Beth Leidman 《Sociology Study》 2011年第1期1-10,共10页
American campaigning has become increasingly complex as it adjusts to our ever-changing cultural landscape. The use of electronic media in the presidential campaigns of 1960 and 2008 is illustrative of this shift. A c... American campaigning has become increasingly complex as it adjusts to our ever-changing cultural landscape. The use of electronic media in the presidential campaigns of 1960 and 2008 is illustrative of this shift. A content analysis of these two campaigns demonstrates how each applied the newest technologies available at the time to define the candidate's image and export the messages to the electorate. Whether it be Kennedy's use of television or Obama's usage of social media, the role that new media of the day played in both campaigns clearly set the tone for future political campaigns. This examination of the role of media in both elections serves to form a primer for how the successful applications of new media lead to campaign victory. Then and now, the growing influence of new technologies on campaigning makes it necessary to compare and contrast the successful usages and strategies employed. The need for continuing analysis will grow in the coming years. 展开更多
关键词 Presidential politics campaigns political communication Barack ohama John F. Kennedy
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奥哈马自我管理模式在稳定期COPD患者行肺康复为主的综合管理治疗的价值
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作者 江婷婷 舒燕 +1 位作者 李婷婷 陈瑶 《中国卫生产业》 2019年第8期94-95,共2页
目的分析讨论对稳定期COPD行肺康复为主患者中实施奥哈马自我管理模式的具体价值。方法选取该院2016年1月—2017年12月稳定期COPD行肺康复为主患者48例,根据入院先后将其均分为两组,每组24例,1组为对照组,实施常规管理模式;两组为观察组... 目的分析讨论对稳定期COPD行肺康复为主患者中实施奥哈马自我管理模式的具体价值。方法选取该院2016年1月—2017年12月稳定期COPD行肺康复为主患者48例,根据入院先后将其均分为两组,每组24例,1组为对照组,实施常规管理模式;两组为观察组,实施奥哈马自我管理模式。比较两组患者康复情况。结果观察组和对照组康复优良依次为95.83%和75.00%,观察组明显高于对照组(P<0.05)。结论对稳定期COPD行肺康复为主患者中实施奥哈马自我管理模式可加快患者正常康复速率,在临床上具有推广使用价值。 展开更多
关键词 COPD 肺康复 奥哈马自我管理模式 综合管理治疗
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聚合物水泥混凝土的微观结构的研究进展 被引量:40
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作者 王培铭 赵国荣 张国防 《硅酸盐学报》 EI CAS CSCD 北大核心 2014年第5期653-660,共8页
聚合物水泥混凝土(PCC)微观结构模型出现后,科研工作者从未间断对此的质疑和补充。介绍了Ohama模型和Beeldens-Ohama-Van Gemert模型的基本原理,评述了其产生的积极作用。Ohama模型的不足在B-O-V模型中得到部分改进,但聚合物颗粒的吸附... 聚合物水泥混凝土(PCC)微观结构模型出现后,科研工作者从未间断对此的质疑和补充。介绍了Ohama模型和Beeldens-Ohama-Van Gemert模型的基本原理,评述了其产生的积极作用。Ohama模型的不足在B-O-V模型中得到部分改进,但聚合物颗粒的吸附现象和水溶性聚合物的二次成膜现象的问题尚未解决。重点阐述了PCC微观结构近10年的研究进展,并对今后研究提出了建议。 展开更多
关键词 聚合物水泥混凝土 微观结构 ohama模型 Beeldens-ohama-Van Gemert模型
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