1) Difference in Difference Approach
二阶差分方法
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) 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。
4) second difference of direction angle
方向二阶差分
6) Twi-differential algorithm
二阶差分算法
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