So, the divergence theorem gives us a way to compute the flux of a vector field for a closed surface.
散度定理为我们提供了一种，计算向量场通过闭曲面的通量的方法。
Remember, the divergence of a vector field What do these two theorems say?
向量场，的散度，这两个定理说了什么呢？
So, if the gradient of a function is a vector, the divergence of a vector field is a function.
如果说函数的梯度是向量，那么向量场的散度就是函数。
So, you should remember, what is this line integral, and what's the divergence of a field?
你们需要记住，什么是线积分，什么是场的散度？
So, what's the physical interpretation of a divergence field?
散度场的物理解释是什么？
And it says that the divergence of the electric field is equal to, so this is a just a physical constant, and what it is equal to depends on what units you are using.
它说的是，电场的散度等于，这是一个物理常数，它等于什么，是基于所用的单位。
OK, so you take the divergence of a vector field.
取一个向量场的散度。
I'm going to prove that the flux of a vector field that has only a z component is actually equal to the triple integral of, RzdV well, the divergence of this is just R sub z dV.
我将要证明，一个只有z分量的向量场的通量,等于一个三重积分，其中被积表达式为。
Another important application of diffraction theory is the study of the far field divergence Angle of a collimated light beam.
衍射理论的另一个重要应用就是研究准直光束的远场发散角。
Various exciting modes of ERT system are introduced and compared in characteristics, and the performance of each mode is mostly judged by the sensitivity as well as the divergence of sensing field.
对ERT系统的多种激励模式作了介绍和特性比较，主要从敏感场的敏感性和发散性两个指标衡量各种激励模式的性能。
The output parameters such as beam divergence angle in far-field output power of high power solid state lasers are variable due to thermal effect of optical pumping.
由于光泵浦热效应，高功率固体激光器的输出参数如光束远场发散角、输出功率等会发生变化。
Topics for the electric field mathematics include: The integral form of Coulomb's Law, Gauss's Law, the equations of Laplace and Poisson, and the divergence theorem.
电场的数学基础包括：库仑定律的积分形式、高斯定理的积分形式，拉普拉斯公式和泊松公式，散度定理。
Since the severe asymmetry of optical field and beam divergence degrade the coupling efficiency, the waveguide structure optimizing needed.
这就要提高激光器出射光场的对称性，减小光的散射角，这需要提高对激光器波导层的结构优化。
The effects of swirl number of primary swirler and radial swirler, area ratio and sleeve divergence angle on the cold flow field of double swirl air intake were investigated.
试验研究了主、径向涡流器旋流数、面积比、套筒扩张角等参数对双旋流进气装置冷态流场的影响。
The deformation field consists of the velocity divergence, it is symmetry matrix.
速度场可分为变形场和旋转场。
The concurrence of parts of speech is one of the issues that cant be evaded in modern Chinese grammatical field with serious divergence of views.
词的兼类是目前现代汉语语法学界无法回避而又分歧严重的问题之一。
The relative errors of the beam width and far-field divergence angle introduced by the spherical aberration increase with increasing spherical aberration coefficient and decreasing beam order.
束宽和远场发散角的相对误差随球差系数绝对值的增加和光束阶数的减小而增加；
The results are as follows:the convergence field of wet Q-vector divergence tilts northwards with height;
结果表明：湿Q矢量散度辐合场随高度向北倾斜；
The primary function of the optical transmit antenna is to collimate far-field divergence of the laser beam and reduce the size of the laser beam in .
由于大气衰减的影响，非视线散射大气光通信需要使用光学天线以提高对光信号的采集能力，进而增加通信距离。
The primary function of the optical transmit antenna is to collimate far-field divergence of the laser beam and reduce the size of the laser beam in .
由于大气衰减的影响，非视线散射大气光通信需要使用光学天线以提高对光信号的采集能力，进而增加通信距离。
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