这是极坐标系下的二重积分。
如果实体是圆形状的话，那就可以考虑用极坐标系。
If my solid is actually just going to be round then I might want to use polar coordinates.
把它转换到极坐标系下。
或者还是用极坐标系，这比直角坐标系更好。
Or I can use polar coordinates,and it works a little bit better that way.
通常你转换到极坐标系下，有可能积分区域更容易建立。
I mean usually you will switch to polar coordinates either because the region is easier to set up.
这道题最合适的方法，应该在极坐标系里面计算。
OK, the right way to do this will be to integrate it in polar coordinates.
使用双极坐标系研究流体在偏心环空内的流动。
The bipolar coordinate system in which the two boundary circles of eccentric annuli become the coordinate surfaces is used.
但还是可以建立这个积分，然后转换到极坐标系下去求结果。
But still we could set this up and then switch to polar coordinates to evaluate this integral.
在双极坐标系内，利用有限体积法对控制方程离散求解。
The governing equations were discretized using a finite volume method on a bipolar coordinate system.
请说，你想知道极坐标系下的积分边界，这是一个二重积分。
Yes? In case you want the bounds for this region in polar coordinates, indeed it would be double integral.
通过把极坐标系作为该运动参照系而继续对模式进行积分。
The model is continued by imposing a polar coordinate system on the moving reference frame.
特征点匹配算法通过动态建立极坐标系和弹性配对特征点来实现。
Rotary coordinates are dynamically established in our matching algorithm, in which an elastic minutiae paring method is used.
介绍了极坐标系下的被动跟踪算法及存在的问题，并分析了其原因。
The traditional passive tracking algorithm under polar coordinates and its deficiencies were analyzed.
在极坐标系里，要记住在积分一侧,只是把x变成rcosθ，y变成rsinθ
So, when you go to polar coordinates, basically all you have to remember on the side of integrate is that x becomes r cosine theta. y becomes r sine theta.
利用极坐标系中径向速度与横向速度的概念求解运动学中的一个追线问题。
Using the concepts of radial velocity and transversal velocity in polar coordinate system, a problem of pursuant trajectory in kinematics is solved.
接下来有个坏消息就是，不仅要会在xy坐标系里做，还要会在极坐标系里做。
So, the bad news is we have to be able to do it not only in xy coordinates, but also in polar coordinates.
分析和计算的空间问题，一般可采用两类坐标系：笛卡儿直角坐标系和极坐标系。
There are two kinds of coordinates, Cartesian coordinates and polar coordinates, with which spatial issues are analyzed and calculated.
首先，导出了用极坐标系描述的中厚板自由振动板的微分方程，用分离变量法求得其一般解。
Firstly, the expressions of free vibration of moderately thick plates in polar coordinates are derived and the general solutions are obtained by the means of method of separation of variables.
提出了将谱元方法应用到极坐标系下，利用极坐标系下的谱元方法求解环形空间内自然对流问题。
The computation of natural convection in the annulus between horizontal concentric cylinders using spectral element method in polar coordinates is presented in this paper.
自适应滤波算法(1)研究了极坐标系下的水下目标被动跟踪问题，建立了被动跟踪的动力学模型。
Adaptive Kalman filter algorithm study (1) Based on the study of the passive target tracking in modified polar coordinates, the nonlinear dynamic model is devised.
导出了极坐标系下扇形截面杆件扭转问题的差分格式；用逐次超松驰迭代法求出了扭转应力函数差分值。
A torsion difference scheme of the bar with sectorial cross-section is developed in polar coordinate system.
提出了在直角坐标系中用多段直线拟合曲线的方法，在极坐标系中用多段阿基米德螺线拟合曲线的方法。
In cartesian coordinates, segments of straight line are used to fit a given curve and in polar coordinates segments of Archimedes helix are used.
详细推导了在极坐标系下的谱元方法的具体计算公式，求解了极坐标系下的简单椭圆型二阶偏微分方程；
The formulas of the spectral element method in polar coordinate are induced and described in detail. Spectral element method is a high-order weighted residual technique.
针对拟谱方法在极坐标下遇到的坐标奇异以及压力边界条件难处理等问题，提出了一种新的基于极坐标系下的拟谱方法。
A new pseudo-spectral method based on polar coordinate system was presented to resolve the difficulty in the coordinate singularity and treatment of pressure boundary conditions.
所以说球坐标系,其实就是在rz平面再建立一个极坐标。
So the idea of spherical coordinate is you're going to polar coordinates again in the rz plane.
所以说球坐标系,其实就是在rz平面再建立一个极坐标。
So the idea of spherical coordinate is you're going to polar coordinates again in the rz plane.
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