The research and progress of micro-fabrication technologies of two-dimensional photonic crystal

The novel material of photonic crystal makes it possible to control a photon, and the photonic integration will have breakthrough progress due to the application of photonic crystal. It is based on the photonic crystal device that the photonic crystal integration could be realized. Therefore, we should first investigate photonic crystal devices based on the active and the passive semiconductor materials, which may have great potential application in photonic integration. The most practical and important method to fabricate two-dimensional photonic crystal is the micro-manufacture method. In this paper, we summarize and evaluate the fabrication methods of two-dimensional photonic crystal in near-infrared region, including electron beam lithography, selection of mask, dry etching, and some works of ours. This will be beneficial to the study of the photonic crystal in China.     

制备工艺对TiO2纳米结构电极光电响应的影响

以钛酸四丁酯水解法合成TiO2纳米粒子胶体,用玻璃棒滚压涂膜制成TiO2纳米结构电极,研究了不同TiO2纳米结构电极的光电响应,用原子力显微镜(AFM)对电极的形貌进行了表征。结果表明:制备工艺不同,电极的光电响应有很大差异,主要与TiO2纳米粒子的粒径大小和膜的表面状态有关。     

Design and Fabrication of Two Kinds of Photonic Crystal Fibers

As a new type optical fiber,because of its particular optical properties,photonic crystal fibers(PCFs) have attracted the academic and industrial field widespread attention.So,the researches about PCFs have made great progress in recent decade.In this paper,two kinds of PCFs constructions are numerically investigated and its leakage-loss properties are simulated.Based on the results of calculations,both the two types of PCFs are fabricated using glass capillary tube stacking.And the process of fiber drawing...     

Fabrication of nanoporous silver by de-alloying Cu-Zr-Ag amorphous alloys

Nanoporous silver (NPS) with a ligament size ranging from 15 to 40 nm was fabricated by de-alloying (Cu₅₀Zr₅₀)_100-xAg_x (x = 10at%, 20at%, 30at%, and 40at%) amorphous ribbons in a mixed aqueous solution of hydrofluoric (HF) acid and nitric acid under free corrosion conditions. Nanoporous silver ligaments and pore sizes were able to be fine-tuned through tailoring the chemical composition, corrosion conditions, and de-alloying time. The ligament size increases with an increase in Ag content and de-alloying time, but decreases with an increase in HF concentration. This phenomenon may be attributed to the dissolution of Zr/Cu and the diffusion, aggregation, nucleation, and recrystallization of Ag, leading to an oriented attachment of adjacent nanocrystals as revealed by TEM analysis.     

微机械技术的现状和发展

本文对微机械技术的起源、制造、应用和发展趋向,作概括介绍.     

静电纺丝技术制备二氧化铈纳米纤维

采用静电纺丝技术制备了PVP／Ce（NO3）3复合微米纤维,研究了反应体系的最佳组成,获得了最佳制备条件。将PVP／Ce（NO3）3复合微米纤维在600℃焙烧10h,获得了晶态CeO2纳米纤维。XRD分析表明,PVP／Ce（NO3）3复合纤维为无定型,CeO2纳米纤维为立方晶系,空间群为OH^5-F^M3m。SEM分析表明,PVP／Ce（NO3）3复合微米纤维表面光滑,平均直径约为1．0～2．0μm;所制备的CeO2纳米纤维的平均直径为300nm,长度大于50μm。     

论中国古代小说“实-虚”观念的变迁与快节奏叙述的嬗变

中国古代小说“快节奏叙述”的地位有一个明显的由主到次的转变过程。该过程与小说家的创作意识由“崇实”到“纪虚”，修饰意识由“尚质”到“尚文”的嬗变过程相一致，它们是小说家的观念形态和实践创作从幼稚走向成熟的重要证据。     

无碴轨道板养护工艺探讨

随着我国客运专线大规模建设,无碴轨道的应用愈加广泛,其制造、养护工艺也成为制造质量的关键。本文通过对室外水平隧道窑养护、室内养护坑养护、室外养护坑养护三种养护工艺进行探讨,比较其优缺点,提出最优化的养护工艺。     

浅谈时速350km客运专线箱梁预制建场方案策划

结合中铁三局集团杭甬客运专线绍兴制梁场建场方案的策划设计，从梁场总体布局、大型机械设备及附属设施资源配置、管理机构设置和人力资源配置等几方面，简述了在制梁场建场时，前期策划的重要性。