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1)  discrete analogues
离散类似
1.
In the present paper,we establish new integral inequalities in two variables and their discrete analogues.
本文建立了新的两个变量的积分不等式及其离散类似,所得结果可作为研究微分方程、积分方程和差分方程的工具。
2)  discrate analog
离散相似
3)  discrete approximation
离散近似
1.
According to the Netwon-Raphson iterative method,first the discrete approximations for surface normal are taken,using finite difference,and then linearize the reflectance function in depth,,instead of and,The new method decreases the complexity and improves the speed of operation greatly,and keeps the shape accuracy.
利用单幅图像恢复其表面特征,实现一种由灰度图恢复表面的快速算法,由Netwon-Raphson迭代方法,使用有限差分法将表面梯度(p,q)离散近似,然后在深度上用线性化反射函数代替p和q,从而降低复杂度,提高速度,同时保持形状的准确性。
4)  approximate discretization
近似离散化
1.
As for the blind area problem in the process of the hydraulic conveyance,the approximate discretization and power compensation are suggested to be adopted as the solution to simplify the system and to improve its stability and preciseness.
针对液压传动死区控制问题,采用死区的近似离散化和增益补偿,可实现较好的死区控制,从而简化系统,提高控制系统的稳定性和精度。
5)  Discrete analogue
离散相似物
6)  quasi discrete approximation
准离散近似
1.
We analytically study soliton excitations in a diatomic chain with different masses and alternating force constants between the nearest neighbors by the means of multiple scales plus quasi discrete approximation method.
利用多重尺度和准离散近似法研究了双原子链 (相邻两原子质量不同 ,作用力常数交替变化 )中的孤子激发。
补充资料:离散时间周期序列的离散傅里叶级数表示
       (1)
  式中χ((n))N为一离散时间周期序列,其周期为N点,即
  式中r为任意整数。X((k))N为频域周期序列,其周期亦为N点,即X(k)=X(k+lN),式中l为任意整数。
  
  从式(1)可导出已知X((k))N求χ((n))N的关系
   (2)
  式(1)和式(2)称为离散傅里叶级数对。
  
  当离散时间周期序列整体向左移位m时,移位后的序列为χ((n+m))N,如果χ((n))N的离散傅里叶级数(DFS)表示为,则χ((n+m))N的DFS表示为
  

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