Scientists have known for a long time that the sun has an 11-year cycle during which radiation measured by sunspots on the surface reaches a peak then falls.

早前研究发现，太阳的活动周期为11年，在此期间，乙太阳表面黑子为衡量标准的太阳辐射达到峰年和谷年。

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The time of high level and the cycle for input pulse was measured with micro-controller to calculate duty cycles.

单片机通过测量输入脉冲的高电平时间及周期而实现占空比测量。

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Methods Using flow cytometry, PCNA and cell cycle in CB CD34 + cells were measured in different conditions and different culture time.

方法采用流式细胞仪技术对不同培养时间和不同培养条件下脐血cd 34 +细胞中pcna的表达水平和细胞周期进行了测定。

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The product life cycle of many models can be measured in weeks, at a time when more than 87 million Americans now own smartphones, according to a comScore report issued in November.

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