the second-derivative spectra
the second-derivative spectra
二阶导数谱
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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For all samples, the raw spectra were pretreated as second derivative and Norris derivative filter(7,5). partial least square (PLS) was used as the calibration algorithm.
在所有的校正模型中，原始谱图经过二阶导数和偏最小二乘（ PLS）处理，20个外部样品用于所建模型的验证，实际和预测的平均相对偏差<5%。
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