Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.
传统的条码识别方法是通过二阶导数零交叉来定位条码边界。
A new method for determining directly trace component in interfering base by absorbance subtraction -second derivative spectrophotometry is proposed.
对利用差谱—二阶导数分光光度法直接测定强干扰基体中微量组分的原理和实验方法进行了探讨。
It is a new method that calculate vertical second derivative of gravity anomalies based on discrete cosine transform (DCT).
基于离散余弦变换(DCT)的重力异常垂向二阶导数的计算方法是笔者提出的新方法。
The baicalin in cream was identified by TLC method and the content of baicalin in cream by second derivative spectrometry.
用薄层色谱法鉴别乳膏中的黄芩苷，并用二阶导数光谱法测定其含量。
Conclusion the formulation and preparation technique are rational and the quality is easy to handle by the method of second derivative spectrometry.
结论制剂处方及制备工艺合理，二阶导数光谱法重现性好，适于该制剂的质量控制。
The Laplacian method searches for zero crossings in the second derivative of the image to find edges.
拉普拉斯算子的方法是在图像的二阶导数搜索零交叉来查找边缘。
Moreover, due to the dynamic equations of LPMs with second-order derivative terms in time, the resulting structure-foundation-soil system can be solved by an explicit time-integration method.
此外，由于模型的动力方程具有二阶时间导数项，因而应用本文模型的结构—基础—土系统可以采用显式时间积分求解。
Moreover, due to the dynamic equations of LPMs with second-order derivative terms in time, the resulting structure-foundation-soil system can be solved by an explicit time-integration method.
此外，由于模型的动力方程具有二阶时间导数项，因而应用本文模型的结构—基础—土系统可以采用显式时间积分求解。
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