1) first vertical derivation
一阶垂向导数
2) vertical second derivative
垂向二阶导数
1.
It is a new method that calculates vertical second derivative of gravity anomalies based on discrete cosine transform(DCT).
基于离散余弦变换(DCT,Discrete Cosine Transform)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。
2.
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。
3) first directional derivative
一阶方向导数
1.
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（Ｆｏｕｒｉｅｒｔｒａｎｓｆｏｒｍ ），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（极大或极小）点来确定边缘。
4) vertical derivative
垂向导数
1.
The vertical derivatives are widely used in processing and interpretation of potential field data,the conventional space domain formulas of calculating vertical derivatives are mostly based on Taylor series which do inevitably bring the truncation error,and are inconvenient to get higher-order derivatives.
垂向导数广泛应用于位场数据处理和解释中,常规的空间域求导公式多以台劳级数为基础,这不可避免会引入截断误差,且不便于求取高阶导数。
5) First derivative
一阶导数
1.
Methods:First derivative spectrometry was established.
方法:采用一阶导数分光光度法,测定波长为275nm和317nm。
6) First-derivative
一阶导数
1.
Determination of the content of allantoin in allantoin-vitamin E cream by zero-crossing first-derivative spectrophotometry;
零交一阶导数分光光度法测定尿囊素维E乳膏中尿囊素含量
补充资料：法向导数
法向导数
nonnal derivative
法向导数【川n招日山滋..e;肋pM幼曰aa“po.3“0汉“明j 定义在一流形的邻域中(或定义在一带边流形上)的函数在此流形(或在流形边界)的法线(加m以1)方向上的导数(由巧论石佬).Jl.月.K邓pa。取B撰齐民友译
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条