查询词典 permittivity of free space

The effects about potential distribution by time-harmonic character and permittivity are discussed.

最后讨论了时谐性和电容率对电位分布的影响。

It was composed by permittivity with periodic structure in one、two or three dimension.

光子晶体是一种新型的光学材料，它是将不同介电常数的介质材料在一维、二维或三维空间内组成具有光波长量级的周期性结构。

As a windfall of such analysis , It points out that physical constant of permittivity in vacuum actually is an constant without physical dimension .

给出了常见的50余个物理单位和物理量的时空组态和时空结构。作为一个分析结果发现，真空介电常数实际上是一个无量纲的物理常数。

Polarimetry properties of electromagnetic waves are sensitive to the scatters permittivity, physical trait, size, orientation and so on. The polarimetric scattering matrix, which describes the backscattering properties of targets completely, can be measured by transmitting and receiving different polarized signals.

电磁波的极化对目标介电常数、物理特性、几何尺寸和取向等比较敏感，通过不同的收发天线组合测量可以得到反映目标散射特性的极化散射矩阵，这为图像理解和目标分析奠定了基础。

The thesis presents the measurement principle and its disturbance factors, as well as the method to obtain the complex permittivity of pressboard with a lumped circuit model.

论文详尽介绍了介电测量技术的原理及影响因素，并提出了利用集总电路模型求被测绝缘纸板的复介电常数的方法。

Since the output signal from fringing field dielectrometry sensors under a low frequency driving voltage are very low, the shield-drive, signal buffer and band-pass filter are adopted to improve SNR. With the signal gain and phase angle from a transform circuit, the complex permittivity of pressboard are obtained.

鉴于边缘场电容式传感器在低频正弦驱动信号作用下输出的感应信号非常微弱，调理电路采用驱动屏蔽方式进行测量信号缓冲，用带阻滤波器提高信噪比，并利用相应的变换电路求出电容系统的相位角和幅值增益，从而得到绝缘纸板的复介电常数。

Complex permittivity includes abundant information, since its real part is the dielectric constant, and the imaginary part is proportional to conductivity.

复介电常数包含了丰富的信息，其实部即为介电率，虚部与导电率成比例；并且介电常数与很多生理参数有关，例如温度、含水量、血量、血氧浓度等。

The on-line density measurement technology with microwave has been narrated as a key part. We has deduced relations between permittivity、the load Q-factor and resonant frequency. And the electromagnetic field for closed cavity 、open cavity has been analyzed. we also discuss the design of cavity that is used in experiment、means for how to stir electromagnetic wave and choice of diameter/length ratio for cavity.

接着重点说明了微波在线密度测量原理，基于麦克斯韦方程组深入推导了微扰情况下介电常数与谐振频率，有载品质因数的关系；分别讨论了封闭谐振腔和开孔谐振腔中的电磁场以及微扰方法中所使用的谐振腔的设计及设计中激励方式、腔长/半径的选择等若干关键问题。

In order to increase the negative refraction bandwidth and the dimension of metamaterials, based on a quadrate structure, a crossing-net metamaterial structure is proposed, and the frequency properties of its permittivity and permeability are simulated.

为拓宽异向介质结构的带宽和维数，在方形环结构的基础上，提出了一种异向介质的交叉网状结构的设计，并对其介电常数和磁导率的频率特性进行了计算机仿真。

The Luneburg lens antenna is composed of a series of concentric shells of constant permittivity. Considering the complexity of numerical calculation, this paper presents a closed-form approach, which combines the spherical vector wave method and the reciprocity theorem.

摘要伦伯透镜是一种球形分层介质天线，考虑到数值计算的复杂性，本文提出用矢量球面波理论和互易原理相结合，分析其性能。

You can buy sweetened beverages, if that suits you.

你若喜欢的话，可以买些含有糖精的混合饮料。

As many of you are probably aware, Nick and Vanessa were recently faced with an embarrasing sex scandal after naked pictures of the two getting jiggy with it in a hot tub surfaced the net.

正如很多你可能知道，尼克和 Vanessa 最近面临一个尴尬的绯闻事件后，赤裸裸的图片两个越来越jiggy与它在浴缸中的一个热点浮现净。