期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
基于四边静矩理论的水泥稳定碎石拌合均匀性评价方法 被引量:2
1
作者 曹源文 贠青青 +2 位作者 李亚南 林艳文 杨国林 《重庆交通大学学报(自然科学版)》 CAS CSCD 北大核心 2020年第5期91-96,共6页
为了更好的评价水泥稳定碎石拌合过程中粗细集料分布是否均匀,利用数字图像技术对新拌水泥稳定碎石图像进行了分析处理。建立了拌合均匀性数学分析模型,基于四遍静矩理论计算分别得到了集料分布均匀系数与面积比系数,并通过工程实验进... 为了更好的评价水泥稳定碎石拌合过程中粗细集料分布是否均匀,利用数字图像技术对新拌水泥稳定碎石图像进行了分析处理。建立了拌合均匀性数学分析模型,基于四遍静矩理论计算分别得到了集料分布均匀系数与面积比系数,并通过工程实验进行了验证分析。结果表明:利用四边静矩理论建立的数学模型,结合均匀性评价方法得到的均匀系数和面积比系数,能够较好地判断出新拌水泥稳定碎石的拌合均匀性。 展开更多
关键词 道路工程 新拌合水泥稳定碎石 四边静矩方法 面积比系数 均匀性系数
在线阅读 下载PDF
Variability of leaf functional traits of invasive tree Rhus typhina L. in North China 被引量:4
2
作者 WEI Mei WANG Shu +3 位作者 WU Bing-de JIANG Kun ZHOU Jia-wei WANG Cong-yan 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第1期155-163,共9页
Functional traits, specifically leaf functional traits, are core-topics to explore importance to the invasion success of invasive plant species. This study aims to address the differences in leaf functional traits and... Functional traits, specifically leaf functional traits, are core-topics to explore importance to the invasion success of invasive plant species. This study aims to address the differences in leaf functional traits and their corresponding variability of the invasive tree staghorn sumac Rhus typhina L. with different invasion success, including lower and higher invasion success, in two climatic regions in North China, including a warm temperate region and a cold temperate region. No significant differences were found for leaf functional traits of staghorn sumac across different invasion success. However, the variability of leaf chlorophyll and nitrogen concentrations of staghorn sumac under higher invasion success were approximately 66.023% and 68.615% higher than those under lower invasion success, respectively. The leaf chlorophyll and nitrogen concentrations of staghorn sumac in the warm temperate region were approximately 18.432% and 16.337% higher than those in cold temperate region, respectively. The variability of specific leaf area of staghorn sumac in warm temperate region was approximately 59.802% higher than that in cold temperate region. Accordingly, leaf chlorophyll and N concentrations as well as specific leaf area of staghorn sumac and their corresponding variability may play an essential role in shaping ecological success of studied invader along a climatic gradient. 展开更多
关键词 climatic region invasive tree coefficient of variation VARIABILITY specific leaf area Rhus typhina L.
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部