4,4′BOX based catalysts: Synthesis,structure and catalytic application

The synthesis of two new 4,4′ bisoxazoline ligands is described. The use of copper complexes of these and three other recently described related ligands as catalysts in a cyclopropanation reaction is discussed. The first structural data on one such chiral copper complex is reported herein.     

MSM9563在掌上中文信息接收终端中的应用

介绍新一代调频附信道数据传输标准DARC的基本帧结构以及基于DARC的解码芯片MSM9563特性，并结合实际给出在掌上中文信息接收终端中的具体应用和实验结果。试验表明，DARC编码器和基于MSM9563的中文信息接收终端组成的系统，在无线通信市场具有广泛的应用前景。     

DARC系统及其应用

调频多工数据广播是近年来国际上发展非常迅速的一项业务。本文较详细地介绍了日本广播协会（ＮＨＫ）研究开发的高速无线数据广播系统－－ＤＡＲＣ系统，并对该系统的实现和应用作了深入阐述。     

The investigation of DARC etch back in DRAM capacitor oxide mask opening

Opening the silicon oxide mask of a capacitor in dynamic random access memory is a critical process on a capacitive coupled plasma (CCP) etch tool.Three steps,dielectric anti-reflective coating (DARC) etch back,silicon oxide etch and strip,are contained.To acquire good performance,such as low leakage current and high capacitance,for further fabricating capacitors,we should firstly optimize DARC etch back.We developed some experiments,focusing on etch time and chemistry,to evalu-ate the profile of a silicon oxide mask,DARC remain and critical dimension.The result shows that etch back time should be con-trolled in the range from 50 to 60 s,based on the current equipment and condition.It will make B/T ratio higher than 70％ mean-while resolve the DARC remain issue.We also found that CH2F2 flow should be ～15 sccm to avoid reversed CD trend and keep in-line CD.