The abrupt change analysis shows that the air temperature changes experienced three abrupt changes with the timescale around 20–30 years in the last 133 years in China, which occurred respectively in 1925–1932, 1986–1988 (cold–warm) and 1950–1956 (warm–cold).
突变分析表明,近百年中国温度变化经历了三次时间尺度为20～30年左右的突变,分别出现于1925～1932年、1986～1988年(冷到暖)和1950～1956年(暖到冷)。
参考来源 - 仪器观测时期中国温度变化研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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。
General mechanic differences and methods of dynamic response analysis of RC structure characterized by abrupt change in horizontal connection stiffness are discussed.
探讨具有水平连接刚度突变特征的钢筋混凝土结构的一般力学特点与动力反应分析方法。
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