聚环氧乙烷球晶中同心环形纹的形成

A synchronization observation was carried out to investigate the growth of PEO spherulites by using a polarizing optical microscope in order to learn the phenomenon of concentric banded stripes occurred during the growth of PEO spherulites.It was found that the concentric banded stripe didn’t come into being until at least two independent PEO-spherulites met each other,the formation of the concentric banded stripes were owing to the tortuosity of the spherulite after colliding with other spherulites.

借用年轮研究股票

触"木"生情,看到大树桩横断面上若干的同心环形纹路,使人立刻想到了年轮——树木的年轮。在专业人士眼里,从年轮的数目、疏密程度、颜色深浅,可以看到:1、树龄;2、当地生长环境;3、当年受环境因素的影响情况。所以,研究年轮对于研究树木的生长及其生长的环境很有意义。年轮越多,研究的内容愈丰富。