用Al或Mo/Al/Mo低阻材料改善4-Mask工艺中Al腐蚀的方法

为了减少制造工艺的过程,改进的4-Mask工艺中采用Al基的数据线已得到进一步的完善。但这个工艺仍存在很多问题,主要是为减少工艺过程,而引入干法刻蚀对Al有腐蚀作用。本文应用CF4/O2等离子体处理,很好地阻止了对Al的腐蚀,得到很好的效果,对改进后4-Mask工艺的进一步应用具有非常重要的意义。     

30 km远程分布光纤拉曼温度传感器系统的实验研究

研制成功一套 30km远程分布光纤拉曼温度传感器 (DOFRTS)系统 ,采用了新的光纤放大的反斯托克斯背向拉曼自发散射测温原理和 15 5 0nm掺铒光纤激光器作为抽运源及高速瞬态波形采样技术 ,累加平均等信号处理技术 ,提高了信噪比 ,解决了弱信号检测问题。使用智能化恒温技术 ,使主要元器件在恒温条件下工作 ,解决了工程应用中环境的适应性问题。经鉴定 ,远程分布光纤拉曼温度传感器系统的主要技术指标如下 :光纤长度为 31km ,测温范围为 0～ 10 0℃ (可扩展 ) ,温度测量不确定度为± 2℃ ,温度分辨率为 0 1℃ ,测量时间为 4 32s,空间分辨率为 4m。最后给出了远程分布光纤温度传感器系统性能的国内外对比表     

微量元素Sb对AZ31合金组织与蠕变性能的影响

通过蠕变曲线的测定、x-射线衍射分析及SEM、TEM形貌观察，研究了微量元素Sb对AZ31合金的组织结构及蠕变性能的影响.结果表明：在AZ31合金中加入元素Sb后，有效降低了合金应变量及稳态应变速率.当加入0.84% Sb后，使合金的稳态蠕变速率降低了2.5倍，显著提高了合金的蠕变寿命.高体积分数(～20%)第二相的存在，特别是合金中弥散分布高熔点的Mg₃Sb₂相，在高温蠕变期间可有效地阻碍位错运动，也是该合金具有较好蠕变抗力的主要原因.     

PopFlow: a novel flow management scheme for SDN switch of multiple flow tables based on flow popularity

Pipeline processing is applied to multiple flow tables (MFT) in the switch of software-defined network (SDN) to increase the throughput of the flows. However, the processing time of each flow increases as the size or number of flow tables gets larger. In this paper we propose a novel approach called PopFlow where a table keeping popular flow entries is located up front in the pipeline, and an express path is provided for the flow matching the table. A Markov model is employed for the selection of popular entries considering the match latency and match frequency, and Queuing theory is used to model the flow processing time of the existing MFTbased schemes and the proposed scheme. Computer simulation reveals that the proposed scheme substantially reduces the flow processing time compared to the existing schemes, and the difference gets more significant as the flow arrival rate increases.     

Magnetic force improvement and parameter optimization for magnetic abrasive polishing of AZ31 magnesium alloy

The magnetic force acting on workpiece to be machined plays a significantly important role in magnetic abrasive polishing process.But in a case of polishing nonferrous materials,the strength of magnetic force is very low and it leads lower polishing efficiency.The magnesium alloy that has superior mechanical properties for industrial application such as a lightweight and high specific strength is one of the most famous nonferrous materials.An improving strategy of the magnetic force for the AZ31 magnesiu...     

Chemical and sensory properties of cholesterol-reduced processed cheese spread

This study examines the property changes of cholesterol-reduced processed cheese spread made by cross-linked β-cyclodextrin. Its composition was similar to that of the control and 91.5% of the cholesterol was removed. Total free amino acids content, gumminess and brittleness scores were significantly higher in cholesterol-reduced cheese spread over all storage periods than those in the control. Yellowness, bitterness and elasticity scores were significantly higher, whereas processed flavour and slimy texture were significantly lower in cholesterol-reduced cheese spread. This study indicates that although some differences were observed, most of the properties were comparable with the control processed cheese spread.