查询词典 forward difference quotient

In this paper, based on an optimum difference operator for spatial differential given by Holberg, an optimum difference method of modeling crosswell elastic wavefield is put forward, which adopts the staggered-grid technique and calculates the wavefield at different grid points. When the half length of optimum difference operator is taken as four to six points, the required number of grid points per wavelength equals to three, crosshole elastic wavefield numerical modeling can attain satisfied accuracy.

本文以Holberg提出的一种空间微分的最佳差分算子为基础，采用交错网格技术，提出了一种模拟井间弹性波场的最佳差分法，该方法能在大空间网格点上得到精确的波场值，当最佳差分算子的半长度取4～6个点，每个波长只采3个样点时，井间弹性波场的模拟就可以得到满意的精度，其计算速度比常规有限差分法至少快一个数量级。

Methods ABC and CAB were used to examine the ability of oral language and writing of 41 patients with basal ganglia damaged and 21 patients with cortex damaged. The different types of aphasia and agraphia were detected. The agraphia quotient and writing scores were calculated. Comparing difference with the basal ganglia and cortex.

方法对41例基底神经节损害及21例病变累及左侧大脑皮层区患者，采用ABC法及CAB法测试其口语和书写能力，统计言语障碍类型，计算各项书写得分和失写指数，比较基底神经节与皮层之间的差异。

One bases on function value and another bases on arithmetic average difference quotient. In this paper, the author mainly studies the approximation properties of both the function value and the derivative of two kinds of splines interpolation mentioned before, and the optimal error constants are obtained finally.

文中分别就这两类插值样条的函数值及一阶导数的逼近性质展开讨论，相应得出这两种插值函数在被插函数分别为一阶连续可导和二阶连续可导情况下的最佳误差常数。

Douglas and Russell first presented the idea of characteristics in[13],in whichthe diffusion term is included in the derivative of characteristic direction of the solu-tion and the backward difference quotient along the time axis was replaced by it alongcharacteristic direction.

Douglas，Russell[13]最先提出了特征法的思想，其主要特点是将模型方程的对流项隐含在解沿特征方向的导数之中，以沿特征方向的向后差商逼近取代通常方法中沿时间方向的向后差商逼近。

The optimization model is built, which has the function of decreasing the number of design variables and improving the efficiency of optimization. The Relative Difference Quotient Algorithm is advanced for the optimum design.

建立了能够减少设计变量数量和提高优化效率的优化模型；改进了相对差商法；建立了适用于中剖面结构优化的遗传算法数学模型。

The method replaces the grads in gradient method with difference quotient and can be used to many cases.

然后根据此界的特点，提出了基于差商的参数优化算法，用差商代替导数的计算，具有较大的适用范围。

Additional therelative difference quotient of arches is larger than that of columns.

在优化的过程中，拱杆变化时对整体稳定性系数影响比立柱的影响要大。

The quotient of this difference and the flow setting gives a measure of airway resistance at end inspiration.

这个差别的系数好气流的设置提供了吸气末的阻力测量方法。

We always make use of Lagrange interpolation basis function and multiple difference quotient to solve the problem.

其解决的方法有两种：用Lagrange插值基函数或利用重结点差商。

Stupid people who like to make more intelligent cute, and love to make people more intelligent quotient big difference.

喜欢使愚笨的人变得聪慧可爱，而爱使聪明的人变得智商大落差。

You intone a word of power to rally your allies to your side.

你吟唱出一个大能咒语，使你的战友去你身边重整旗鼓。

Some of the cold sore remedies are so simple that the treatment only consists of one ingredient only.

一些冷战喉咙痛的补救措施是如此简单，治疗的唯一组成成分之一。