这是一个临界点，考察它的二阶导数,会发现这确实是一个极大值点。

That is a critical point. And we used the second derivative to see that this critical point is a local maximum.

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因此，存在一个临界周期使高宽比限值取得极大值。

So there exists a critical period, at which, the limit ratio reaches its maximum value.

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因此，存在一个临界周期使高宽比限值取得极大值。

So there exists a critical period, at which the height width ratio reaches its maximum value.

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岛面密度与膜厚的依赖关系表明，在临界厚度时硅衬底和玻璃衬底上的岛面密度均出现了极大值。

The film thickness dependence of island density shows that a maximum of island density appears at the critical film thickness for both substrates.

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对等温过程中的临界时间公式进行了理论分析与实验验证，证实了临界时间公式用于预测溶质原子非平衡晶界偏聚量达到极大值的恒温时间的准确性。

Theory analysis and experiment had been done for confirming the veracity of the critical time formula used for forecasting the holding time at which the segregation concentration reaches a maximum.

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对等温过程中的临界时间公式进行了理论分析与实验验证，证实了临界时间公式用于预测溶质原子非平衡晶界偏聚量达到极大值的恒温时间的准确性。

Theory analysis and experiment had been done for confirming the veracity of the critical time formula used for forecasting the holding time at which the segregation concentration reaches a maximum.

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