40Gbit/s WDM光传输系统及其关键技术

介绍了40Gbit／s WDM光传输系统的发展状况．并分析了其关键技术。     

软件无线电体系结构研究

软件无线电设备是未来十年电信产业朝着基于IP的网络、在一个混合层次结构的自组网络环境下提供全球无缝无线接入的关键。主要介绍了软件无线电的体系结构、微处理器的选择和软件结构。     

湿法刻蚀腔室结构数值优化

为确定某种新型刻蚀机最优的晶圆与喷淋头间距(Gap),通过CFD仿真分析气体在不同Gap腔室内的物质输运分布,并结合乙醇环境下HF酸刻蚀SiO2工艺的物理化学过程,建立了刻蚀速率估算公式,以此分析了不同Gap腔室的刻蚀速率及刻蚀均匀性,最终获得了具有最佳刻蚀效果的腔室结构.研究分析表明:Gap较小时晶圆中心刻蚀速率偏高,Gap较大时晶圆边缘刻蚀速率偏高;平均刻蚀速率随着Gap的增大逐渐降低,而刻蚀不均匀度随Gap增大先减小后增大,在Gap取值70 mm时刻蚀均匀性最佳且刻蚀速率较高.     

Computational design of proteins with novel structure and functions

Computational design of proteins is a relatively new field, where scientists search the enormous sequence space for sequences that can fold into desired structure and perform desired functions. With the computational approach, proteins can be designed, for example, as regulators of biological processes, novel enzymes, or as biotherapeutics. These approaches not only provide valuable information for understanding of sequence–structure–function relations in proteins, but also hold promise for applications to protein engineering and biomedical research. In this review, we briefly introduce the rationale for computational protein design, then summarize the recent progress in this field, including de novo protein design, enzyme design, and design of protein–protein interactions. Challenges and future prospects of this field are also discussed.     

湿法刻蚀机腔室关键结构及主要工艺参数对刻蚀性能的影响因素研究

以某18英寸湿法刻蚀机腔室为研究对象,建立了流-热耦合的数值分析模型,研究了刻蚀过程中工艺气体在圆筒式腔室内流速、压强、温度的分布规律,结合HF酸在乙醇环境下刻蚀SiO2的工艺原理,提出了由耗散系数、物质转换系数、物质量通量、品格结构等表征的刻蚀速率及刻蚀不均匀性评价方法,得到了腔室关键结构及主要工艺的参数对刻蚀性能的影响规律.