坐标系的

In this paper,we use direct linear transformation algorithm to compute the homographic matrix between the known ground control points with equal elevation and the corresponding points on the image plane, then establish the relationships between the homographic matrix and the collinearity equations, and finally give the mathematic models for computing the intrinsic and extrinsic parameters of the aerial camera.

该方法根据单张航空像片估计伞载空中摄像机焦距及摄像机在世界坐标系中的位置和姿态角等外参数，利用直接线性变换算法求取已知等高地面控制点与对应像点之间的单应矩阵，建立了单应矩阵与共线条件方程之间的关联关系，最后根据关联关系推导出计算航空摄像机焦距、纵横比、位置和姿态角等内外参数的数学模型。

Summer monsoon precipitation in 1998 is simulated with different soil temperature and solar short wave radiation parameterization schemes using the improved p-σ nine level hybrid coordinate model.It is found that the improved soil temperature calculation method together with Lacis and Hansen short wave radiation parameterization has a good simulation for precipitation.

利用改进后的p-σ 9层混合坐标系模式，采用不同的土壤温度与太阳短波辐射参数化方案，对1998年夏季风降水进行模拟，发现改进的土壤温度计算法和改进的Lacis和Hansen 短波辐射参数化方法相结合能较好地模拟降水。

Through solving the nondivergent inviscid linear vorticity equation in cylindrical coordination of barotropic atmosphere with WKBJ method, the authors point out that one kind of wave, named vortex Rossby wave, which is similar to planetary wave, exists in hurricane, its formation is due to the gradient of vertical vorticity component of basic state.

作者中文名：钟科；康建伟；余清平摘要：文中从柱坐标系下的正压无辐散涡度方程出发，用WKBJ方法求解方程，发现在飓风中存在类似于行星罗斯贝波的涡旋罗斯贝波，这种波的形成主要是由于飓风中基态涡度垂直分量的径向梯度所决定。

The moving thermal source at different weld velocity was utilized succeedingly in this paper via a moving coordinate system. The whole temperature field in any sections at different time and the thermal cycle curves of any positions were obtained.

应用ANSYS软件，通过建立随热源移动的坐标系，成功地实现了不同焊速下的热源移动问题，模拟结果可以得到任一时刻、任一截面的整体温度场和任一位置的焊接热循环。

Permanent Magnet Synchronous Motor drived by triphase sinusoidal current is research object in this paper . Its mathematics models in several coordinate are set up , controlling principles of flux linkage and torque are discussed under DTC and the block diagram of PMSM with DTC is presented.

本文以三相正弦波驱动的永磁同步电机为研究对象，建立了其在不同坐标系下的数学模型，并深入探讨直接转矩控制中永磁同步电机的磁链和转矩的控制思想，给出控制方案。

PLIC3D algorithm, a 3-dimensional VOF method with piecewise linear interface construction and split and unsplit propagation, is specially devised for better solution to free surfaces. Particularly split PLIC3D is applied in numerically modeling draining from bottom of a cylindrical vessel and water-exit of a revolution body, from which evolutions of free surfaces are mainly illustrated.

重点在直角坐标系中推导了用斜面构造自由界面，使用分裂和不分裂推进的三维VOF方法：PLIC3D，以改善自由面求解精度；并用分裂的PLIC3D算法模拟了三维的柱形容器泄漏和旋成体出水问题，结果主要显示了它们的液面运动变化。

Under the unstaggered grids, the continuous equation is replaced with the elliptic different one of the pressure, which is derived by the finite-analytic method, and a modilfied new SIMPLER algorithm is proposed to be used as an equal-order pressure-velocity coupling scheme. A simple procedure is applied to determine the cell-face velocity independent of the under-relaxation factor used in solving the momentum equations.

在三维船体贴体坐标系下，运用有限解析解法对控制方程进行离散，采用压力与速度耦合的改进的SIMPLER计算方法结合标准的K—ε方程湍流模式，数值求解RANS方程，并计算了作斜航运动三维船体的粘性绕流场、压力分布以及水动力。

Firstly,by moving and circumrotating coordinate switching the complex model of tri－phase AC aosynchronism motor to Magnetization－Torque two axeses,The physical model of AC color Is transformed model of DC motor approximately,It is convenience to control the motor.

首先，经过坐标的平移和旋转变换，将原三相交流异步电机的复杂模型转换到M－T（Magnetization－Torque）两轴旋转坐标系上，将交流电机的物理型等效地变换成近似于直流电动机的模型，为控制带来方便。

First1y, by moving and circumrotating coordinate switching thecomp1ex model of tri--phase AC asynchronism motor to Magnetization-Torque two axeses, the physica1 mode1 of AC motor is transformedmode1 of DC motor approximate1y, it is convenience to contro1 the motor.

首先，经过坐标的平移和旋转变换，将原三相交流异步电机的复杂模型转换到M-T(Magnetization-Torque)两轴旋转坐标系上，将交流电机的物理模型等效地变换成近似于直流电动机的模型，为控制带来方便。

The method of selecting matriculates, in which the consulting archives is depended on a grade of tatol mark of matriculation, is translated by mathematical language in this paper.

高考招生按总分分段投档方法的数学分析表明：人类进行这类感觉在其中起重要作用的思维决策过程，实质上是在一个既能容纳客体又能容纳主体心理重心点的性质多面体重心坐标系中完成的。

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。