cyclical variation

the process quality of semiconductor manufacturing is influenced by variant factors, such as positional variation, cyclical variation and temporal variation. a new process quality analysis method based on multi-vari analysis is presented.

针对半导体晶圆生产中存在着位置间变异、晶圆间变异及批次间变异，提出了基于多变异分析（MVA）的工序质量分析方法。

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When the white noise level ( coefficient of variation ) increases to 20 % , the cyclical fish population spasmodic.

在白色噪音水平 ( 变动系数 ) 增加至20%时, 周期型种群变为不稳定型.

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these two measures of cyclical variation, percent of trend and relative cyclical residual, are percentages of the trend.

度量周期波动的两个量&趋势百分数和相关周期余数，都以趋势值的百分比表示。

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the flow entering the thermal exchanger appears cyclical variation since the engine of gas-heating pumps discharges the exhaust gasses discontinuously. so, using the traditional stable state method to design and simulate the thermal exchanger will produce big error.

天然气热泵发动机汽缸工作排烟气的不连续性，使进入换热器流量呈现周期性变化，因此，将传统的稳态方法用于发动机烟气换热器的设计与模拟会产生较大的误差。

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research the cyclical variation seasonality of logistics demand forecasting

研究结果表明：I.物流需求预测中周期因素和季节因素的探讨

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meanwhile, there were significant differences in abundance percentage of different body length in gammarus community and corophium community, and some cyclical variation was showed.

同时，钩虾和蜾蠃蜚群落不同体长个体的丰度百分比差异明显，表现出一定的周期性变化规律。

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characteristics of cyclical variation for four-stroke small utility gasoline engine

小型通用四冲程汽油机循环波动特性研究

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results the cyclical variation of the sao 2 is associated with that of the respiratory flow, and there is essential coherence between the cyclical variation of the pulse rate and that of respiratory flow in the most patients.

结果患者SaO2的周期性变化与其呼吸气流的周期性变化是一致的。大部分患者脉率变化周期与呼吸气流变化周期基本一致。

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in recent 47 years, the seasonal and annual number of precipitation days in hubei province reflected the cyclical variation during four years.

近47年湖北省四季及年降水日数的年际变化均呈现出了4年左右的变化周期。

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