另一个重要的概念是，积分区域。
There is another thing which is the region over which you integrate.
这个图像表达式是用来描述积分区域的。
This is how I want to describe the surface on which I will be integrating.
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.
当我通过这边的时候，我就可以进入了积分区域。
积分区域和被积函数结构是函数积分的两个关键点。
The integral range and the integrand structure are the two key points of the function integral.
积分限的确定重点就是要确定积分区域在坐标面上的投影。
The limits of integration definite key is needs to determine the range of integration on coordinate plane projection .
如果给出了积分区域，你就要找出积分边界，也许通过选择适当的坐标系来做。
If it is the region of integration then it will go into the bounds of the integral and maybe in the choice of the coordinate system that you use for integrating.
相对简单的、找出边界的办法,就是在u、v坐标系下画出积分区域。
And to find the bounds perhaps the easiest is to draw a picture of a region in u, v coordinates.
给出了一种代数法交换积分次序的方法，避免了作积分区域图的麻烦。
The article introduces a method in which the order of quadratic integral can be exchanged with the knowledge of elementary.
题目给出了积分的条件，就必须要弄清楚，什么是积分的函数，什么是积分区域。
When you are given a piece of data in the statement of a problem, you have to figure out whether that is part of a function to be integrated or whether that is part of the region of integration.
为了克服上述困难，根据各个夹杂相积分区域的相似性，本文提出了边界元相似子域法。
In order to overcome the above-mentioned difficulty, similar subdomain BEM scheme is presented in this paper, based on the similarity of the integral area of inclusion phases.
在本文中，给出了方形积分区域上球面积的解析解，并在一极限条件下验证了该解析解的合理性。
In this paper, we give an analytical solution of the spherical area in the rectangular integral domain, and verify the validity of the solution under a limit condition.
数值算例结果表明该法能够明显提高计算效率，在显式积分区域和精细积分区域都有很高的精度。
Numerical examples demonstrate that the proposed method can obviously increase computation efficiency and has higher accuracy in both kinds of integration regions.
定积分的计算是高等数学的重要内容之一，但在积分计算时可以结合积分区域的对称性和被积函数的奇偶性来简化计算。
Optimal calculation of definite integral can be obtained by combination of the odevity of function and the symmetry of integral domain.
定积分的计算是高等数学的重要内容之一，但在积分计算时可以结合积分区域的对称性和被积函数的奇偶性来简化计算。
Optimal calculation of definite integral can be obtained by combination of the odevity of function and the symmetry of integral domain.
应用推荐