1) second difference
二阶差分
1.
Phase unwrapping algorithm based on minimum second difference;
基于最小二阶差分的相展开方法
2.
Weighted minimum cost flow phase unwrapping algorithm based on second difference;
基于二阶差分的加权最小费用流相位展开算法
2) second order difference method
二阶差分法
1.
By second order difference method processing of the resistivity depth sounding data on the Jiaojia type fracture zone alteration rock pattern gold deposit, the top interface of the deep fracture zone alteration-mineralization belt can be clearly identified and the top interface burying depth can be calculated by the 0- line feature of ρ_α~m section map.
焦家式破碎带蚀变岩型金矿床上的电阻率测深资料经二阶差分法处理后,可以明显识别深部断裂构造蚀变矿化带的顶界面,并可利用ραm断面图的0-线特征求取其顶界面埋深。
3) local minima of second derivatives
二阶差分极小值
1.
A precise real-time R wave detection algorithm based on local minima of second derivatives and cross-zero points of first derivatives of ambulatory ECG signals, developed , is presented in this paper.
提出了采用二阶差分极小值和一阶差分过零点来精确定位动态心电图R波的实时检测算法,包括ECG信号的四点平均滤波处理、心电信号二阶差分极小值的求解及其化简、R波的准确定位和具有自学习及自适应功能的信号检测门限的设计等。
4) second order difference equation
二阶差分方程
1.
New oscillation criteria are presented in this paper for nonlinear second order difference equations:Δ2bun+∑mi=1ainfi(un,Δbun)=0, n=0,1,2,…
对非线性二阶差分方程Δ２ｂｕｎ＋∑ｍｉ＝１ａｉｎｆｉ（ｕｎ，Δｂｕｎ）＝０，ｎ＝０，１，２，…给出并证明了它的有界解振动的新充分判则。
2.
Oscillation criteria for nonlinear second order difference equations are established,Results obtained improve theorems in the literature[5].
本文建立了非线性二阶差分方程的若干振动准则，所得结果改进了文［５］中相应的定理。
5) second degree Boolean difference
二阶布尔差分
6) second-order upwind difference
二阶迎风差分
补充资料：对称差分(n阶的)
对称差分(n阶的)
symmetric difference of order
对称差分(n阶的)l另11111州tric山ffer曰℃eof份der‘c“MMe邓一，ecK即pa3Hoc几“op，皿Kan」，一元实变函数f在点x上的 表达式 声/n、，.、。，/.n一Zk八 △口ffx，h)=)l:’1(一1)“f lx十二二~一竺二生h 1. 一‘““一””k饥戈k/、‘产“戈一2‘’/‘将h换成Zh，下面的表达式也称为对称差分: 息川(一1)*，‘二+、。一2、)。).假若f(x)在x有n阶导数厂时(x)，那么 △二f(x，h)=./戈n)(x)h”+o(h”). T .fl .J’IyKame皿。撰
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参考词条