1) second-order frequency deviation
二阶频差
2) 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
3) second-order deviation
二阶离差
4) cascaded sum-and difference-frequency generation
级联和频与差频二阶非线性效应
1.
A) tunable wavelength conversion between picosecond pulses is experimentally demonstrated by using the cascaded sum-and difference-frequency generation(cSFG/DFG) in a periodically poled LiNbO_3(PPLN) waveguide.
实验研究了周期域反转铌酸锂光波导级联和频与差频二阶非线性效应(cSFG/DFG)皮秒脉冲间的可调谐波长转换。
5) quadric difference frequency
二次差频
1.
The realization mode of solving ambiguity for multiple frequency ranging usually has two kinds:quadric difference frequency and uneven dual frequency.
多频测距解模糊的实现方式通常有两种 :二次差频和参差双频 。
6) second order solution in frequency domain
频域二阶解
1.
The second order solution in frequency domain and linear solution in time domain of hydrodynamic moment acting on the vertical rocker flap oscillating in the water to generate plane wave are derived with analytical expressions.
本文给出直立摇板简谐摇荡造二维波时所受水动力矩的频域二阶解和时域线性解的解析表达式,可供估算摇板式造波机设计功率时使用,也可为摇板所受水动力矩时域非线性数值计算提供比较的依据。
补充资料：R阶差数列
相邻两项相减,得到一个新数列,一直如此操作直到得到常数列,减了几次,就称为几阶差数列
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