差分法

The numerical simulation of the new type of DNG is studied by using FDTD method and CST software,and the physical mechanism analysis for this structure is discussed in detail.

用时域有限差分法和CST软件对该新型结构进行了模拟对比，并对其物理机理进行了分析，解释了其双负效应发生的原因。

The method uses Cartesian grid for the majority of flow field with special treatment to cells cut by the solid boundary, thus not only retains the advantage of Cartesian grid's high solving speed, but also ensures the high precision near the boundary, which avoids the distortion coming from scalariform mesh with traditional difference method.

该方法在流场主要区域采用笛卡尔网格，而对与固体边界相交处的单元采用特殊的处理。这样既保留了笛卡尔网格求解速度快的优点，同时在边界处又保证了精度，避免了传统差分法处理该类问题需采用阶梯形网格逼近而导致的失真问题。

The average rate of use of cyclic difference method realized.

运用循环的平均幅度差分法实现的。

In this paper,the in- fluence of the coupling aperture on the sound energy decay and coupling constant in the primary room is investigated by means of the finite-difference time-domain method,and the investigation is limited within the low-frequency range.

文中运用时域有限差分法，在低频范围内模拟了耦合窗面积的改变对主厅中不同位置的耦合常数和声能衰减的影响。

Then, the positions and shapes of nearest holes are adjusted to excite more defect modes, and the relation between defect modes and modified cavity in defect region are discussed.

我们利用有限时域差分法，针对六角晶格缺陷结构的光局限特性进行模拟。

Firstly, based on the wave equation, determining reasonably its initial boundary condition, the paper establishes a computer diagnostic model of oil pumping mechanical well, the damping factor in the model has been reasonably determined, the implicit difference solutionis conducted to the model by changing of step width expression difference solves, and the half analytical solution is explored to the model - fine integral method; and realizes the transformation from dot indicator diagram to indicator diagram of any section.

首先从抽油机井计算机诊断技术的理论基础入手，考虑多级抽油杆连续性，建立了粘滞阻尼波动方程，合理确定模型中的阻尼系数，采用无条件稳定的隐式差分法及半解析方法求解方程，获得抽油杆柱任意断面和抽油泵处的示功图。

The high - order difference method of wave equation has the advantages of high accuracy and small numerical dispersion.

波动方程高阶差分法具有精度高、数值频散小的优点。

It is calculated with finite difference method.

采用有限差分法对其进行求解。

The finite differential method is used to calculate the temperature field.

在计算温度场的过程中引入了有限差分法。

The prospects for the use of differential detection method can detect better the prospects of good results, and the method is simple.

详细说明：使用差分法进行前景检测，能较好的检测出前景，效果好，并且方法简单。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。