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Based analysis above, we chose the spatial resolution of 1°×1°in the horizontal direction and 5~30 km in depth. Using the pseudobending method to calculate the ray traveling path and residual of travel time; LSQR method to inverse, we got the final 3-D P wave velocity structure in this area.

根据上述分析，以水平方向1°×1°，垂直方向以5 km、15 km、30 km为间隔划分网格，并建立初始速度模型，采用伪弯曲射线追踪方法计算走时和射线路径，通过基于LSQR算法的反演重建了研究区域40 km以下、480 km以上的三维P波速度结构。

The 3-D crustal stress model for Zhaoao oilfield was built up on base of the finite element numerical simulation. The crustal stress spatial distribution was obtained which is close to real stress field.

应用有限元数值模拟的方法，建立了赵凹油田三维地应力模型，得到了与真实应力场最为接近的地应力空间分布，确立了地应力分布与套损的关系。

This model used the finite—difference approximation to the advection— dispersion equation. The spatial derivatives in the flow equation are approximated by central difference written about grid—block boundaries and time derivatives are approximated by a fully implicit backward scheme.

水流方程的空间导数采用中心差分格式离散，时间导数采用隐式差分格式离散，建立了土壤水分和污染物在各种饱和度的条件下迁移转化方程耦合求解的二维数值计算模型。

A new scheme for approximating the solution of 2D Maxwell's equations-the high order symplectic scheme is proposed to overcome the shortcoming of the conventional finite difference time domain. The scheme is obtained by discretizing the Maxwell's equations in time domain based on symplectic scheme with high order, and then evaluating the equation in spatial domain with second or fourth order finite difference approximation.

为克服标准时域有限差分方法的缺陷，引入一种新的数值计算方法－高阶辛算法求解Maxwell方程，即在时间上用高阶辛差分格式离散，空间分别采用二阶及四阶精度的差分格式离散。

In the structural static finite element analysis part, the paper studies how to realize the structural static analysis modulate by the method of spatial finite element.

结构静力有限元分析部分研究了用空间有限元法实现FSWAS系统的结构静力分析计算模块。

Based on the Collins formula, the analytical propagation equations for a Gaussian beam through a multiple spatial filter system are derived by using the methods of the matrix decomposition and expanding the aperture function into a finite sum of complex Gaussian function .

以Collins衍射积分公式为基础，利用A0CD矩阵分解与物理实现的技巧，以及将硬边光阑窗口函数展开为有限个复高斯函数之和的方法，推导出了高斯光束通过多级空间滤波器系统的传输方程，并用数值计算加以说明。

MAIN OUTCOME MEASURES: Spatial learning and memory, mean escape latency, times of passing through the platform point, swimming distance percentage of the first quadrant, and swimming distance percentage of the 20％ marginal area.

主要观察指标：空间学习记忆能力，平均逃避潜伏期，穿过平台次数，第一象限游泳距离百分率，20％边缘区游泳距离百分率。

3Phenological phase of vegetation in different Spatial location from 1982 to 1999 is fitted based on curve. As a result, phenological phase of forest has very coarse fitting precision.

3用曲线拟合的方法监测了植被生长季的空间变化，结果表明，森林物候期的总体拟合精度较低，草原的拟合精度好于森林的拟合精度。

In order to acquire the spatial stress distribution of the pier-beam fixed joint , a pier-beam fixed joint finite element space model is established and analyzed in different loading cases.

为掌握石板坡大桥墩梁固结点的三维应力状态，建立了墩梁固结点结构分析的空间有限元模型，根据施工过程中及成桥后的工况，分别进行了空间有限元计算，得到了墩梁固结点在三种工况下的应力分布情况，检验了设计的安全性与合理性，提出了改善墩梁固结点应力的措施和方法，为设计和施工提供了科学的依据。

In order to make a better study of the collection and utilization of rainfall so as to achieve the spatial and temporal redistribution of precipitation, the experiment adopted the method of fixed point observation and observed the outcomes by different surface processing techniques.

采取定位观测的方法，在山西省岚县香沟小流域研究集雨场的规划设计，地表处理技术，观测其集流量和集流效率，并对梯田作物有无补灌措施的生产效益进行对比试验研究。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。