Design of Polarization-independent Wavelength-interleave Coupler in Fluorinated Polyimide Waveguide

Based on the measurement of dispersion characteristic and birefractive index of the fluorinated polyimide film,a statistical optimum design method is proposed and used to realize the design of 32-and 36-wavelengths optical waveguide wavelength-interleave coupler (i,e.,interleaver) with the optimization of polarization fluctuation and wavelength interval of 0.8nm at 1550nm. The largest cross coupling ratios of the two interleavers are respectively less than 1.8% and 3.5%, while the least through coupling ratios are respectively greater than 98. 2% and 96. 5%. The output differences due to polarization fluctuation are less than 1.7% and 3.2%     

一种动态开关电容运算放大器共模负反馈电路

本文主要介绍了一种应用于Cascode结构运放中的开关电容共模负反馈电路，它具有稳定性好、对运放频率特性影响小、不消耗额外功率等优点。对电路运用Hspice进行了模拟，并给出了模拟结果。     

Plasma spraying of nanostructured partially yttria stabilized zirconia powders

Nanosized partially yttria stabilized zirconia particles, prepared using a co-precipitation method, were reprocessed into agglomerate powders using two methods for plasma spraying. The first method was to make micrometer-sized agglomerates directly following the grinding of the calcined yttria–zirconia agglomerates. The second method was to reconstitute the nanosized particles into micrometer agglomerates using spray drying. The deposition efficiency, porosity, microhardness and average grain size of the deposits made from these two reprocessed powders were studied. Distinct results related to the process parameters were obtained for the two types of powders. The second type of powder was more suitable for plasma spraying than the first one. Using the second type of powder, some unique results distinguished from those of the conventional partially yttria stabilized zirconia powders were observed and an optimized coating with a porosity of 3.8%, Hv_0.3 of 953 and mainly consisting of 1–3 μm columnar grains in the columnar direction and smaller than 100 nm in their cross-sections was achieved.     

贵冶二期闪速炉失重给料螺旋运行实践

本文介绍了贵冶失重给料螺旋的性能、生产准备、点检维修、技术攻关、缺陷改进。     

美国钢铁企业的并购浪潮及特点分析

介绍了最近美国大型钢铁企业发生的主要并购活动。并对这些并购活动的特点进行了分析。     

纳米α-Fe的合成及分散

在甲醇-水体系中以NaBH4还原二价铁离子,得到了粒径为10～40nm的α-Fe金属粒子。在反应体系中加入右旋糖苷等分散剂以强化产物颗粒的分散。采用X射线衍射及透射电镜等测试方法对合成产物进行检测。结果表明,以湿化学还原法能合成纳米α-Fe金属粒子,但产物呈现网状团聚状态;右旋糖苷能很好地分散产物团聚体,在其作用下产物颗粒呈稳定的分散状态。     

RTK技术在黄土塬地震勘探测量中的应用

在对RTK技术进行简要介绍的基础上，叙述了这一技术在黄土塬地区地震勘探测量中的应用，及所取得的良好测量资料。     

薄板坯连铸生产SS400钢工艺技术研究

对唐钢薄板坯连铸机生产的SS400钢的生产工艺进行了分析,认为薄板坯连铸机生产的SS400钢,在采取了精炼站在线定氧,将钢水全氧控制在25×10~(-6)左右,同时连铸采取保护浇注和轻压下等技术后,能够确保薄板坯连铸SS400钢的顺利浇注,轧制的板带材表面质量良好,机械性能符合要求。     

扇形段电磁搅拌对82B钢连铸坯成分和组织的影响

进行了结晶器搅拌和结晶器 +扇形段电磁搅拌连铸 82B钢 2 80mm× 380mm方坯的工业试验。结果表明 ,扇形段搅拌降低和改善了铸坯的中心偏析、疏松和夹杂物分布。 82B钢铸坯经扇形段搅拌后 ,中心部位碳含量峰值明显减小 ,碳偏析指数降低 5 7%～ 1 0 8% ,铸坯成分的方差值 (σ)减小 32 %～ 34 9%。     

用Simadyn-D改造宝钢150t电弧炉整流器控制系统

宝钢炼钢厂150 t电弧炉是我国目前最大的直流电弧炉,2003年对其整流器控制系统进行了改造。新系统采用的硬件是西门子公司的Simadyn-D系统,采用CFC编程环境。由于新系统可以与冶炼弧流模型紧密结合,因此保证了在各冶炼阶段调节器性能的最优。