以下为句子列表：
英文: In this paper, first-principles calculations within the generalized gradient approximation (GGA) are carried out on the band gaps of zigzag SWNTs (7, 0) (8, 0) (9, 0) and (12, 0).
中文: 摘要本文采用基于广义梯度近似(GGA)的第一性原理方法，对锯齿型单壁破纳米管(7,0)、(8,0)、(9,0)、(12,0)的能带结构和能隙进行理论计算。
更详细...
英文: In this paper, we present the analytical results of the total band gaps of sound waves in two-dimensional sonic crystals using the plane wave expansion method.
中文: 声子晶体的频沟现象，可应用于彻体波滤波器或表面声波滤波器，阻止特定角度与频率入射的声子传递，藉以达成滤波之效果。
更详细...
英文: Photonic band gap (PBG) crystals endow people the power to control and manipulate photons, but fabrication of photonic crystals, especially those that work at the near-infrared and visible wavelength is a hard work, requiring high-quality materials.
中文: 光子带隙晶体使人们可以有效地控制和操纵光子，但是构建光子晶体，尤其是近红外及可见光区域的光子晶体是一个困难的工作，它对材料提出了很高的要求。
更详细...
英文: The band gap's broaden is apparent when the larger refractive index layer is graded.
中文: 改变高折射率层的几何厚度，光子带隙的拓宽更为显著。
更详细...
英文: The calculation results obviously show that the width and center position of band gaps depend on the position and the refractive index as well as the radius of the cylinder doped with impurities.
中文: 数值结果表明，对于一定的入射方向，光子晶体中的带隙的宽度、中心位置都受到掺杂所处的位置、掺杂物的折射率、掺杂柱的粗细不同程度的影响。
更详细...
|
