And that  all still equals the charge inside the Gaussian surface divided by the permittivity of free space.

而这一切仍然等于高斯表面内的电荷除以自由空间的介电常。

And that is equal to the change in electric flux over time, multiplied by the permittivity of free space constant.

这等于电通量随时间的变化乘以自由空间常的介电常。

The permittivity distribution reconstructed by ECT and sound velocity distribution reconstructed by URT are processed by pixel-to-pixel thresholding fusion method.

通过像素合方法处理ECT重建的介电常分布和URT重建的声速分布。

We also know the Coulomb constant equals the  inverse of the quantity four pi times the permittivity of free space.

我们还知道库仑常等于四圆周率乘以自由空间介电常的。

And that’s why the full equation for capacitance includes a dielectric constant, K. So dielectrics can help capacitors hold even more energy.

这就是为什么完整的电容方程包括介电常 K。因此电介质可以帮助电容器保持更多的能量。

ECT can be used to reconstruct the permittivity distributions of the cross section, while UT is skilled to distinguish the boundaries of two-phase.

ECT可用于重建横截面的介电常分布, 而UT擅长区分两相的边界。

You can take our energy density equation and substitute the magnetic field magnitude, B, with the electric field, times the square root of the permittivity constants.

您可以使用我们的能量密度方程，并用电场和介电常的平方根时间替换磁场的大小 B。

This equation simplifies down to an equation with two constants, the permittivity of free space for electric fields, epsilon naught, and the permittivity of free space for magnetic fields, mu naught.

该方程简化了具有两个常的方程，电场的自由空间介电常 epsilon 为零，磁场的自由空间介电常 mu。

The electric flux which passes through a sphere which is  concentric to a positive point charge equals the charge of the positive point charge  divided by the permittivity of free space.

穿过与正点电荷同心的球体的电通量等于正点电荷的电荷除以自由空间的介电常。

29. Question: What is the key factor to consider when choosing a PCB material for high - frequency applications in PCBA? Answer: Low dielectric constant and low dissipation factor to minimize signal loss.

29. 问题：为 PCBA 中的高频应用选择 PCB 材料时要考虑的关键因素是什么？答案：低介电常和低耗散因，可最大限度地减少信号损失。

I won't blame you if you don't remember, but the permittivity of free space is a constant of proportionally we've used before, that relates electric charge to the physical effect of electric fields.

如果你不提我不会怪你，但自由空间介电常是我们之前使用的相对论常，它将电荷与电场的物理效应联系起来。

Mathematically, this equation says that electric flux is the integral of the electric field over the area of the surface, which is equal to the enclosed charge, divided by the permittivity of free space.

在上，这个方程表明电通量是表面积上电场的一个组成部分，它等于闭合电荷除以自由空间的介电常。

And we get that the magnitude of the electric  field which surrounds and is caused by an infinitely large, thin plane of charges  equals surface charge density divided by the quantity two times permittivity of free space.

我们发现，由无限大而薄的电荷平面包围并引起的电场强度等于表面电荷密度除以自由空间介电常的两倍。