查询词典 dielectric

Luneberg lens is a spherical lens which its permittivity varies with normalized radial coordinates. It is fabricated by using different homogeneous dielectric centrically layered media. The lens can focus a parallel beam of rays from any direction exactly at a point on the surface. If it is made by adding a reflecting surface "metallic cap", it is called Luneberg lens reflector. It can reflect incident wave into plane wave in incoming direction. It is usually applied in antenna, radar reflector,satellite-based, and mobile-communucation.

龙伯球透镜为一种介电系数与半径成一固定比例的球形透镜，大部分是由数层不同介电系数介电质组合而成，而其主要特性能够把入射波聚焦到球表面一点，假使在透镜表面处镀上一圆锥角金属层即为龙伯球透镜反射器，能把入射波依平面波的型态反射回原入射端，通常用於天线、雷达、卫星通讯、军事等方面。

Depending on the spacial periodic distribution of the dielectric constant, PCs are sorted.

根据介电常数的空间周期分布，对光子晶体进行分类，并介绍了光子晶体的制作技术。

Because of the collective modulation of the periodic dielectric distribution to the incident electromagnetic waves, the directions of the group velocity and the phase velocity can be opposite, a photonic crystal slab can work as a negative refractive-index material.

由于介电函数的周期性分布对入射光的调制作用，使得特定频率区域的入射光在光子晶体中传播时的群速度方向和相速度方向相反，因而使得光子晶体平板表现出负折射特性。

The dielectric permittivity is calculated in the limit of small concentration and weak applied electrical fields.

这和我们在第三章所讨论的计算非平面金属表面上的像势具有类似的地方。

As a main function parameter of dielectric material, measurement methods of permittivity are diverse.

介电常数是介质材料的主要性能参数之一，其测量方法多样。

The dielectric properties of these samples were measured by perturbation theory.

利用微扰法对各个样品的微波介电性能进行了测试。

However, the monoclinic phase, with the lowest dielectric constant, is the stable phase under ambient condition.

然而在常温常压下单斜晶是最稳定的结构但是它的介电常数却是最低的。

For the low linear saturation threshold of photoelectric detector,a new and reliable method used in diagnostic system is introduced to attenuate high energy laser power density using multilayer dielectric coating.

针对环形光刀取样式高能激光束在线测量系统应用中光电探测器线性饱和功率密度低而被测高能激光功率密度高的特点，采用对取样激光扩束和介质膜衰减片级联衰减的方式，实现了数千倍的线性光强衰减。

Therefore, how to improve cellular PP films\' thermal stability of piezoelectricity and charge storage becomes one of the focuses in the field of the functional dielectric materials.

因此，如何改善这种功能膜的储电及压电热稳定性是近年来倍受关注的课题。

The totally reflected beam by a dielectric interface actually exhibits a lateral shift from the position of geometric reflection in the plane of incidence,and a transverse shift normal to the plane of incidence.

光束在电介质界面发生全反射时，实际反射光束会在入射面内相对于几何反射光束产生一侧向位移，在垂直于入射面的方向产生一横向位移。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。