应用太赫兹时域光谱技术结合移动窗口相关系数法筛选与种子老化密切相关的太赫兹特征波段。选取3个不同品种的玉米种子,并制备人工老化0、1、2、3、4 d的实验样本,采用衰减全反射(Attenuated total reflection,ATR)附件采集从样本分离...应用太赫兹时域光谱技术结合移动窗口相关系数法筛选与种子老化密切相关的太赫兹特征波段。选取3个不同品种的玉米种子,并制备人工老化0、1、2、3、4 d的实验样本,采用衰减全反射(Attenuated total reflection,ATR)附件采集从样本分离得到的种胚和胚乳粉末的太赫兹吸光度谱(0.2~80 cm^-1),应用移动窗口相关系数法(窗口宽度为10,阈值为0.3)筛选样本种胚和胚乳特征谱区。结果表明,不同品种样本筛选得到的老化特征谱区差异显著,说明种子老化进程受品种影响较大;在相同的老化阶段,不同品种样本的特征谱区也存在部分共同区间,且主要集中在60~80 cm^-1,说明老化进程中有些成分的变化相近;种胚和胚乳在相同老化阶段筛选的特征谱区不同,说明两者在老化进程中生理变化存在差异。本研究表明太赫兹时域光谱结合化学计量学方法可用于快速表征并探测玉米种子老化的动态变化过程。展开更多
The mobile factors of cracked ore in vibrating-ore draw shafts were analyzed. The results show that the mobile coefficient of cracked ores will be mainly influenced by the combination of ore physical factors if the st...The mobile factors of cracked ore in vibrating-ore draw shafts were analyzed. The results show that the mobile coefficient of cracked ores will be mainly influenced by the combination of ore physical factors if the structure dimension and parameters of vibrating ore-draw shafts are sure. It decreases with increasing the cohesion, lump content, lump size and powder content and increases with increasing the porosity. The coefficient decreases with increasing the moisture content, but increases after the moisture content reaches a certain value. Uniform grain leads to better mobility, non-uniform grain leads to worse mobility. The value of the mobile coefficient should be in a range of 0.3-1.1 when designing the vibrating ore-draw shafts. According to correlation degree of grey system (theory,) the effects of factors on the mobility of cracked ore are given in the weight decreasing consequence as follows: moisture content, lump content, distribution of grain size, lump size, porosity, cohesion and powder ore content. It is unreasonable to neglect any one because the values of their weights are not obvious.展开更多
基金Project(50325415) supported by the National Science Fund for Distinguished Young Scholars project(50321402) sup ported by the National Science Fund for Innovative Research Group
文摘The mobile factors of cracked ore in vibrating-ore draw shafts were analyzed. The results show that the mobile coefficient of cracked ores will be mainly influenced by the combination of ore physical factors if the structure dimension and parameters of vibrating ore-draw shafts are sure. It decreases with increasing the cohesion, lump content, lump size and powder content and increases with increasing the porosity. The coefficient decreases with increasing the moisture content, but increases after the moisture content reaches a certain value. Uniform grain leads to better mobility, non-uniform grain leads to worse mobility. The value of the mobile coefficient should be in a range of 0.3-1.1 when designing the vibrating ore-draw shafts. According to correlation degree of grey system (theory,) the effects of factors on the mobility of cracked ore are given in the weight decreasing consequence as follows: moisture content, lump content, distribution of grain size, lump size, porosity, cohesion and powder ore content. It is unreasonable to neglect any one because the values of their weights are not obvious.
