non-periodical variation 非周期性变化
The features of unified and periodical variation between gold mineralization and magmatic activity are closely related to the evolution of tectonic structure of the area.
金矿成矿作用与岩浆活动之间表现出统一性和周期性的变化特征，是和本区大地构造演化密切相关的。
The wavelet coefficient curves of temperature and precipitation on different time scales reveal that the long periodical variation trend is quite different from the short.
气温和降水在不同时间尺度上的小波系数变化曲线图揭示了气候的长期和短期变化趋势有很大不同。
Periodical analysis showed that abrupt change of sediment load happened in 1968 and 1984, which divided the variation process of river sediment load into three stages.
中国主要河流入海泥沙还具有明显的三个阶段变化特征，即分别在1968年和1984年前后发生了突变。
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