单词double integral
na.: (二)重积分
网络: 二重积分；双重积分；重积分计算
二重积分
Sometimes if it"s the volume between the x, y plane and the graph of some function, you can just set it up directly as a double integral.
有时要计算的体积处于x，y平面，和某函数图象之间，则可以直接当作二重积分计算。
The final formula for the moment of inertia about the origin is the double integral of a region of r squared density dA.
关于原点的转动惯量，就是在区域上，求r^2*δ*dA的二重积分。
One example that we did, in particular, was to compute the double integral of a quarter of a unit disk.
我们已经做过的一个例子是，计算四分之一单位圆上的二重积分。
Double integral over a surface of F dot n dS is going to be --What are we going to do?
在曲面上做F•ndS的二重积分，会是……我们要怎么做？
And, when you"ve done that, it becomes just a double integral in the usual sense.
这么做的话，它就变成了通常的二重积分。
But, you know, it gives you an example where you can turn are really hard line integral into an easier double integral.
但是你知道，它给了你一个例证，其中你可以，把复杂的线积分化成简单些的二重积分。
FndS Well, we said that this flux would be given by double integral on S of F dot n dS.
流量将由，在S上的二重积分给出。
You know how to compute a double integral of a function.
要懂得如何计算一个函数的二重积分。
If it is a closed curve, we should be able to replace it by a double integral.
如果是一条闭曲线，也可以用二重积分来代替的。
Use geometry or you need to set up for double integral of a surface.
总之，就是用几何方法或是在曲面上建立二重积分。