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The cutoff conditions of metal-clad waveguides or loss dielectric waveguides are discussed. The effects of metal-cladding on the cutoff condition of graded index waveguides are analyzed at first. The principle of cutoff intensity modulator has discussed in detail.

本文首次提出一种适合于分析含金属覆盖层的均匀和渐变介质波导在截止点附近的光学特性的近似的解析方法，并对金属覆盖层的均匀阶跃介质波导在截止点附近的模传播特性作了全面的分析，所得到的结果同精确的数值解结果相吻合。

An approximate analytical approach, which can be used to analyze the optical characteristics of metal-clad step or graded index waveguides in near cutoff, is presented at first. The mode propagation characteristics of metal-clad step index waveguides in near cutoff are comprehensively analyzed.

GaAs/GaAlAs异质结光波导材料是目前集成光学中的重要材料，本论文在系统介绍外延生长技术的基础上，利用普通的液相外延炉，成功地生长出可用于光波导器件制作的、表面较光滑并具有较大面积（14×16mm〓）的GaAs/GaAlAs异质结光波导材料，C-V法测得波导层载流子浓度为2—4×10〓cm〓，Al-Schottky接触的反向电压大于20伏，平板波导和脊波导通光实验良好。

Guangzhou Chun Fung Metal Machinery Factory is to provide you with the most excellent machine / mechanical attachment peripheral products, mainly produce: wire protection hose (PA, PP, PE, PVC, metal-clad plastic pipe) and pipe joints, cable clamps waterproof connector , cooling, engineering (plastic / aluminum) towline, plate-type / organ-style shield, rubber protective kit, work lights, etc. to operate.

广州骏丰金属机械厂是为您提供最优秀的机床/机械外围附件产品，主要生产：电线保护软管（PA、PP、PE、PVC、金属包塑管）及管接头、电缆防水夹紧接头、冷却管、工程拖链、钢板式/风琴式防护罩、橡胶防护套、工作灯、操作件等。

The metal-coated substrate (240, 340) provides an extensive, metal rich environment for SERS, SERRS, hyper-Raman and/or CARS Raman spectroscopy.

金属涂覆衬底(240、340)为SERS、SERRS、超拉曼和/或CARS拉曼光谱术提供广延的、富含金属的环境。

But its frequency bandwidth is in the middle (5) Metal nanotubes were prepared by heating metal-coated carbon nanofibers inthe air to remove carbon nanofiber templates.

5将镀层纳米碳纤维在空气中热处理，可以去除纳米碳纤维，获得纳米金属管。

Therefore we have optimized the experimental system and the working status of instrument.2 The near-field SERS spectra and images for the [Ru_3]~(2+) molecule adsorbed on silver nanoparticle substrate were achieved. Based on the results, some specific phenomena for near-field SERS were found. By observing the near-field SERS spectra collected at different location at the nano-scale, the different spectral characteristics which are caused by the local environmental differences of molecules have been found. On the substrate, the highly SERS active sites are much more than SEF hot spots, and the distribution of them is not entirely consistent. This phenomenon could be explained by the influences of several factors including the different enhancement efficiencies existed for SERS and SEF, the quenching effects for fluorescence by the metal substrate and metal-coated tip, and the presence of different numbers of probing molecules in SERS and SEF.3 It is of interest that the near-field and far-field SER spectra demonstrate several distinctively different spectral features.

由于SNOM与SERS的结合在技术上将面临很多实际困难，例如近场激发信号极其微弱、纳米级微弱光谱的收集对实验精度和环境稳定性的苛刻要求等，因此我们对实验体系和仪器工作状态分别进行了优化。2获得了银纳米粒子SERS基底上[Ru_3]~(2+)分子在纳米尺度下的近场SERS光谱和图像，从中可以发现一些近场SERS效应特有的现象：通过观察不同位置得到的近场SERS光谱可以发现，在纳米尺度下，由于分子所处局域环境不同而体现出不同的光谱特征；此基底具有极高SERS活性的位点远多于表面增强荧光热点，且两者的分布并不完全一致。

The company was established in 2000, in all kinds of metal-cutting tools, non-standard metal-cutting tool to undertake the design and manufacture for customers to provide technical help.

本公司成立于2000年，主要生产经营各种金属切削刀具，大量承接各种非标金属切削刀具的设计制造。为客户提供技术帮助。

Company covers an area of 50,000 square meters, plant construction area of 36,000 square meters, with all kinds of metal-cutting machine tools and sheet metal welding Cold Working more than 450 sets of equipment, the company employees 340 people, including six experts, senior technical staff 49 people, 20 senior management staff.

公司占地面积50000平方米，厂房建筑面积36000平方米，有各类金属切削机床及冷作钣焊设备450多台套，公司现有员工340人，其中专家6人，高级技术人员49人，高级管理人员20人。

The field of metal cutting engineering and technical personnel and front-line technical workers to read, but also can be used as metal-cutting processing industry workers in training materials.

本书可供金属切削加工领域的工程技术人员和一线技术工人阅读，也可作为金属切削加工行业的工人培训教材。

In the paper the principle of metal-cutting and Finite Element Analysis are introduced, based on which 3D FEA model of metal-cutting process is built.

本文通过深入研究金属切削原理和有限元理论，建立了金属切削的三维有限元模型，借助ANSYS和LS-DYNA有限元分析软件对金属切削过程实现了三维仿真分析。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。