共查询到20条相似文献，搜索用时 468 毫秒
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在南方地区,由于降雨充沛,建筑外墙渗漏成了质量通病。文章就高层住宅外墙渗漏的经验和教训,分析探讨了住宅外墙渗透的原因,结合集信名城的具体工程项目,提出了一些对应措施。 相似文献
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从砌筑、外墙粉刷、材料质量、温度裂缝、不均匀沉降和建筑构造不当方面分析了砖混结构住宅建筑外墙渗漏的原因，并提出了相应的防治措施。 相似文献
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地下连续墙施工中的关键工序 总被引：2，自引：0，他引：2
作为建筑结构的重要组成部分,地下连续墙的混凝土浇捣方法不当会影响混凝土质量,墙幅接头处理不好会使接头处产生渗漏,影响结构的正常使用。本文就地下连续墙施工中这两个应注意的问题进行了讨论。 相似文献
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简介2005～2008年西双版纳勐腊县民营橡胶推广防雨帽技术和取得效益;提出存在问题和建议。 相似文献
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以碧桃幼苗为试验材料,研究盐胁迫对其叶片电解质渗透率、丙二醛含量和叶片相对含水量的影响。结果表明：盐胁迫下,叶片的电解质渗透率有上升趋势,且胁迫时间越久,电解质渗透率上升的越高;叶片内丙二醛含量的变化趋势与电解质渗透率的变化趋势相似,胁迫时间越久、浓度越高,丙二醛含量越高;轻度盐胁迫对碧桃幼苗叶片相对含水量的影响不显著。 相似文献
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通过喷淋试验,研究不同pH模拟酸雨对台湾桤木叶片K＋、Ca2＋、Mg2＋渗出量的影响。经过一定时间的酸雨胁迫,台湾桤木苗木叶片K＋、Ca2＋、Mg2＋渗出量随着pH值的减少而增加,呈现负相关效应。处理I-V的叶片K＋渗出量分别比对照（CK）升高34%、25.5%、17.4%,16.7%,11.4%;处理I-V的叶片Ca2＋渗出量分别比对照（CK）升高36%、25%、18%、5%、3%;处理I-V的叶片Mg2＋渗出量分别比对照（CK）升高58.3%、41.6%、37.5%、29.2%、22.1%。并且随着酸雨胁迫时间的延续,叶片K＋渗出量和Mg2＋渗出量的变化趋势均大致为先升高后下降,而Ca2＋渗出量则不断降低。 相似文献
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CDM林业碳汇项目的泄漏问题分析 总被引：12，自引：0，他引：12
在对CDM林业碳汇项目泄漏的定义、类型以及目前各国的林业碳汇试点项目进行研究的基础上,从泄漏的原因、机理、影响范围等方面对造林或再造林项目以及森林保护项目中潜在的泄漏进行分析,提出用决策树方法来确定项目所产生的潜在泄漏,用项目所涉及的范围或泄漏的指示特征来监测项目所产生的泄漏,从政策和项目发展的角度来理解和管理林业项目中的泄漏等几点建议,以期对评估和监测我国林业碳汇项目潜在的泄漏以及如何在CDM林业碳汇项目设计中最大限度地减少潜在泄漏提供帮助. 相似文献
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作者依据工程实践,对住宅工程施工中的质量问题进行了分析,如混凝土楼板裂缝、屋面渗漏、卫生间或厨房地面渗漏等常见的质量问题,并提出了防治措施。 相似文献
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Seasonal changes in freezing stress resistance of needles of red pine (Pinus resinosa Ait.) and Austrian pine (Pinus nigra Arnold) trees were measured by an electrolyte leakage method and by visual observation. During most of the year, freezing stress resistance determined by the two methods gave similar results. The electrolyte leakage method provided a good estimate of seasonal changes in freezing stress resistance except for red pine needles in their most winter-hardy state. To obtain a reliable estimate of freezing stress resistance in winter-hardy red pine needles it was necessary to combine the electrolyte leakage method with visual observations. When red pine needles survived exposure to -80 degrees C or lower, electrolyte leakage was never more than 30% even when the needles were exposed to a slow freeze-thaw stress of -196 degrees C. However, rapid freezing of red pine needles to -196 degrees C resulted in electrolyte leakage of over 80%. Red pine needles attained a much higher freezing stress resistance during the winter than Austrian pine. Red pine needles also acclimated and deacclimated faster than Austrian pine needles. An index of injury was developed based on the electrolyte leakage method ((R(2) + R(1))/2, where R(1) is the minimum % electrolyte leakage from noninjured tissue and R(2) is the maximum % electrolyte leakage at the highest injury) that reliably predicted freezing stress resistance of pine needles for most of the year. Important aspects for developing a successful index of injury for pine needles are: use of cut needles, vacuum infiltration and shaking during incubation in water.We conclude that: (1) during cold acclimation the cell wall properties of the pine needles changed and these changes, which appeared to differ in the two species, might explain the very low leakage of electrolytes from winter-hardy needles of red pine; (2) pine needles survive winter by developing the ability to tolerate extracellular ice formation, because after rapid freezing the needles were severely injured; and (3) red pine is adapted to a shorter growing season and colder winters than Austrian pine. 相似文献