电磁波

The rules of the cold-test characteristics changing with helix pitch are also studied and it turns out that, with increasing helix pitch, the phase velocity increases linearly, the interaction impedance changes nonlinearly and the attenuation constant decreases nonlinearly. At the same time, with the limitation of the synchronism between the electron beam and the electromagnetic wave, the change of pitch is small and therefore an approximate linear relation can be introduced.

研究表明：相速几乎随螺距增大而线性变大，互作用阻抗与螺距是非线性的关系，衰减常数随螺距增大而非线性地减小；由于在维持电子注与电磁波速度同步的限制下，螺距变化的幅度不可能很大，因此可近似按线性关系来处理互作用阻抗及衰减常数与螺距之间的关系。

From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先从一般的等效电路模型出发，根据Bloch周期性理论对该结构的相移、衰减和阻抗特性进行了分析，结果表明该新结构具有类似带通滤波器的特性：通带内衰减常数为零，特性阻抗为实数并随频率连续平滑分布，具有可任意指定的阻抗匹配带宽；带外特性阻抗为纯虚数，电磁波传播受到抑制。

This experiment is in frequency adjustment X-mitter about that miniwatt frequency adjustment X-mitter operating principle, analyses the debugging making method and their installation, the microphone changes implication into an audible signal, wave an audible signal being modulated as a result of enlarging the day afer tomorrow being in progress to the carrier wave , producing frequency adjustment, by the fact that air wire launching the frequency adjustment electromagnetic wave to the outside , the radio set just can with frequency adjustment meet hear clear implication.

本毕业设计是关于小功率调频发射机工作原理、分析制作方法及其安装调试，在调频发射机中，话筒将话音转化为音频信号，音频信号经放大后对载波进行调制，产生调频波，通过天线向外发射调频电磁波，用调频收音机便可以接听到清楚的话音。

And recently, new principle is involved in using a bare metal wire for the THz band waveguide application.

文中介绍了近年来使用的新原理，即用一根裸露的导线用来在太赫波波段传送电磁波。

Moreover, bamboo charcoal can block electromagnetic radiation and release anions to purify the air, and produce a healthy and fresh living environment.

除此之外，竹炭能阻隔电磁波和产生负离子净化空气，为人类带来了一个健康清新的生活空间。

Based on the suggestion of dual nature of light in wave and particle, de Broglie put forward a totally new hypothesis using a method with converse thought.

在20世纪初，物理学的研究发现，原先被公认为是电磁波的光，其实还具有微粒性。

WLAN uses the public electromagnetic wave as its carrier, which brings not only convenience but also security problems.

无线局域网使用公共电磁波作传输介质，这在为用户带来便捷的同时也为其网络安全问题带来新的挑战。

Based on time domain Maxwell equations, the basic theory of Finite Difference Time Domain of the cartesian coordinates is introduced in detail.

本文由时域麦克斯韦方程出发，在直角坐标系下介绍了时域有限差分方法的基本原理，分析了电磁波在空间的传播规律及吸收边界的吸收效果。

Urban built-up land is a complex land-use class and has a heterogeneous characteristic in reflected electromagnetic spectrum.

城市建筑用地是一种复杂的土地利用类型，在电磁波反射光谱上表现出明显的异质性。

An accelerated charged particle radiates energy in the from of an electromagnetic wave.

作加速运动的电荷会以电磁波的形式辐射能量。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。