折射率

In order to measure accurately the refractive index of optical glass to improve the imaging quality of optical systems,several measuring methods of refractive index for optical glass were analyzed and both foreign and domestic development situations for optical glass measurement were introduced.

为准确测量光学玻璃的折射率，提高光学系统成像质量，介绍了现有光学玻璃折射率测试方法和国内外发展现状，提出了一种利用测量棱镜3个顶角所对应的3个最小偏向角的折射率测量新方法。

The main innovations in this dissertation are the following:(1) High refractive index glass beads are made by laser;(2) Large and small beads inlayed films are fabricated;(3) The second rainbow method is presented and used on measuring the refractive index of high refractive index glass beads.

本论文的创新点在于：(1)用CO〓激光成功地制作了高折射率玻璃微珠；(2)完成了大小珠镶嵌结构的微珠列阵逆向反射膜的实验设计和制作；(3)提出并实现了用二次彩虹法测量高折射率玻璃微珠的折射率。

In theory, geometrical and diffractive methods are calculated and numeric results are received. A experimental setup is made for measuring glass beads refractive index by rainbow method.

提出了二次彩虹法测量高折射率玻璃微珠折射率的新方法，理论上分别用几何光学和衍射光学的方法分析了一次彩虹法和二次彩虹法测量玻璃微珠折射率的原理，给出了相应的数值结果，比较了两种测量方法各自的特点。

It has great potentialities in such fields as micro-optics, integrated optics and optics communication.Firstly, based on the basic theory of GRIN optics the optical effects of the spherical symmetry GRIN micro-sphere lens were analyzed systematically.

本工作从梯度折射率介质光学的基本理论出发对球对称GRIN微球透镜的光学性能进行了系统分析；选择两种适当单体，采用悬浮扩散共聚法制备出聚合物梯度折射率微球透镜；测量所得透镜的折射率分布曲线和其他光学参数。

For understanding the phase and transfer properties of optical wave propagating through negative refractive index medium layer, the relations between negative refractive index, the value and direction of wave vector k, the coordinates and the phase have been investigated intensively.

针对在理解负折射率材料中光波的传播特性时相位的特殊性质，详细分析推证了负折射率介质中折射率、波矢k的大小和方向、空间坐标系以及波相相位互之间的关系。

For example, all previous theoretical predictions and experimental observations have been questioned by Valanju et,wherein the authors claim that the presence of dispersion prevents power transmitted at RHM-LHM interface from refracting at a negative angle, which means the refraction of group velocity n_g carrying the physics information isall along positive refraction, but "negative refractive material " means only the refraction of phase velocity np is negative.

涉及最多的是负折射现象在物理上的因果率，例如Valanju等人通过一些理论计算认为所谓的"负折射率材料"只是相速的折射率n_p可以是负的，而携带物理信号的群速度的折射率n_g永远是正的，由此引发了许多争议。

The calculation accuracy of the solid content is not high because the errors occurred during the mensuration of sizing's refractivity ,therefore it is necessary to test the dependability of these data.

根据折射率来计算混合浆的含固率时，由于测定折射率时存在误差，导致了含固率的计算精度不高，故有必要对所测折射率进行置信度的验证。

Based on the data of 5 years in 1970s with duct present and those of December 1990, refractivity at height of 1 km, the average gradient of refractivity and surface refractivity are obtained by regression of the refractivity profiles to exponential models. And it is found that the constants in the exponential relation of refractivity of 1 km above ground and the mean vertical refractivity gradient in the first kilometer height with the surface value of refractivity are 110.6, 0.002 9 and -8.6, 0.004 7 respectively according the data of the 1970s?

对上世纪70年代中5年内波导出现的数据和1990年12月份的全部数据的研究表明：贴地波导出现时，它们的值及其和Ns指数关系的常数分别是110.6、0.002 9和-8.6、0.004 7，地面上1 km处的折射率N1k及地面上第一公里内的平均折射率梯度dN1和地面折射率Ns的相关性比没有波导出现的情况好；而这两者相比，前者的结果又比后者好。

However, the refraction of plane wave in reaction-diffusion system obeys Snell's law only for proper diffusion coefficients and system parameters.

在二维复金兹堡-朗道方程描述的反应扩散振荡系统中，就扩散对平面波折射率的影响进行了数值研究，从Snell定律出发导出了折射率的解析表达式，数值和理论结果表明：在纯扩散情况下，平面波的折射满足Snell折射定律，扩散只影响着平面波折射率的大小；在同时存在反应扩散情况下，只有在适当的扩散系数和系统参数下，平面波的折射才满足Snell折射定律。

Its wave propagation properties in symmetry and asymmetry structure are analyzed by 3-D EBPM including the analysis and study of the influence of refractive index to wave propagation. The bend fiber-slab is also studied in this paper and point that the influence of the refractive index of the substrate to wave propagation in fiber-slab is very important. The calculating results agree with the results of the test.

本论文利用三维显式光束传播法很方便地分析了对称、非对称光纤—光波导复合结构中光波的传输问题，包括光纤折射率的大小、光波导折射率的大小对光波传输的影响等在内的主要内容；随后又研究了光纤弯曲时光波导包层折射率对光纤内能量功率大小的影响，计算结果和实验结果吻合。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。