first-order derivative

first-order derivative的基本解释

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第一次导数

与first-order derivative相关的网络例句 [注：此内容来源于网络，仅供参考]

In this paper, a new edge detection method——method using extremum of first directional derivative is proposed, based upon a general gradient edge model.

文中通过傅里叶变换，在频率域，通过求垂直于边缘的一阶方向导数，并检测其极值点来确定边缘。

The match models were recalculated after the first derivative. Better results are achieved and the discriminability is remarkably enhanced, especially to the minimums distance model.

标 签 高光谱遥感地物光谱最小距离光谱角度匹配光谱相似度匹配导数 hyperspectral remote sensing spectral match model minimums distance SAM SCF derivative

The first rank derivative is a reflection of curve change and its rate, at certain range, if the sign of the first rank derivative has changed, the logging value of the correspondence depth point means maximum in this range; the second rank derivative is the knaggy property reflection of curve, at certain range, if the sign of the second rank derivative has changed, the correspondence depth point represent the inflexion of geophysical logging curve, it＇s also a turning point of the reflection of knaggy change property of the curve, it is the interface of stratum.

测井曲线的值是深度的函数，测井曲线的一阶导数表示了曲线变化的趋势和变化的快慢，在某一范围内，当一阶导数呈现符号转换时，相对应的深度点的测井值即为该范围内极大值；测井曲线的二阶导数则表示曲线的凹凸性，在某一范围内，当二阶导数呈现符号转换时，相对应的深度点代表了测井曲线的拐点，即反映曲线凹凸性变化的转折点，亦即地层的分界面。

与first-order derivative相关的网络解释 [注：此内容来源于网络，仅供参考]

First derivative：一阶导数

建立了快速测量茶多酚中总儿茶素含量的近红外光谱定标模型.将48份茶多酚样品组成定标样品集,在1000-2500nm(4000-10000cm^-1)的近红外漫反射光谱为定标波长范围内,光谱经一阶导数(First derivative)、二阶导数(Second derivative)、标准归一化(Standard normal variate,

first derivative spectrum：一级导数光谱

first derivative 一阶导数 | first derivative spectrum 一级导数光谱 | first derived curve 导曲线

first time derivative：一阶时间导数

first term 首项 | first time derivative 一阶时间导数 | first treatment 预处理