无线携能保密网络下的中继协作波束形成算法

本文研究了无线携能通信网络中的多窃听者场景下,基于无线能量收集放大转发中继的协作机密信息安全传输问题.提出了两种低复杂度的零空间波束形成方案.分别利用接收者或窃听者方位先验信息,将待优化的目标矢量投射到接收者或窃听者信道的零空间.与原协作波束形成方法相比,由于降低了待优化目标矢量的空间自由度,本文方法运算复杂度较低.特别的,由于第二种方法目标函数中将窃听者的交互信息迫零,将原始拟凸优化问题转化为凸问题求解,进一步降低了运算量.实验研究验证了本文方法的合理性.     

Cu CMP工艺中新型低pH碱性抛光液稳定性的研究

Abstract： The stability of a novel low-pH alkaline slurry （marked as slurry A, pH = 8.5） for copper chemical mechanical planarization was investigated in this paper. First of all, the stability mechanism of the alkaline slurry was studied. Then many parameters have been tested for researching the stability of the slurry through comparing with a traditional alkaline slurry （marked as slurry B, pH = 9.5）, such as the pH value, particle size and zeta potential. Apart from this, the stability of the copper removal rate, dishing, erosion and surface roughness were also studied. All the results show that the stability of the novel low-pH alkaline slurry is better than the traditional alkaline slurry. The working-life of the novel low-pH alkaline slurry reaches 48 h.     

新型碱性精抛液对300mm铜膜全局平坦化的影响

The copper removal rate and uniformity of two types copper slurries were investigated, which was performed on the 300 mm chemical mechanical planarization （CMP） platform. The experiment results illustrate that the removal rate of the two slurries is nearly the same. Slurry A is mainly composed ofa FA/OI1 type chelating agent and the uniformity reaches to 88.32%. While the uniformity of slurry B is 96.68%, which is mainly composed of a FA/OV type chelating agent. This phenomenon demonstrates that under the same process conditions, the uniformity of different slurries is vastly different. The CMP performance was evaluated in terms of the dishing and erosion values. In this paper, the relationship between the uniformity and the planarization was deeply analyzed, which is mainly based on the endpoint detection mechanism. The experiment results reveal that the slurry with good uniformity has low dishing and erosion. The slurry with bad uniformity, by contract, increases Cu dishing significantly and causes copper loss in the recessed region. Therefore, the following conclusions are drawn： slurry B can improve the wafer leveling efficiently and minimize the resistance and current density along the line, which is helpful to improve the device yield and product reliability. This investigation provides a guide to improve the uniformity and achieve the global and local planarization. It is very significant to meet the requirements for 22 nm technology nodes and control the dishing and erosion efficiently.     

负性VALCD三基色阈值特性分析

彩色液晶显示器件(CLCD在相同电压驱动条件下各波长透射率有很大的差别,从而引起图像显示的色彩饱和度或还原性不够。用UVVis8500型双光束紫外/可见分光光度计测量在不同电压驱动下负性VALCD的电光特性,对三基色的阈值特性和阈值特性随波长变化关系进行分析。结果表明,阈值电压V饱和电压V和中值电压V都是随着波长的增加而逐渐增大,并且饱和电压与阈值电压之差随着波长的增加而变大。对常用三种中心波长500.0 nm、550.0 nm和600.0 nm的中值电压V作为驱动电压进行分析,其结果为CLCD选取驱动电压提供一定的指导作用。     

从AutoCAD中提取实体数据的研究

从提取实体数据的角度,对ＡｕｔｏＣＡＤ中ＤＸＦ文件结构进行了简单分析,着重介绍了基本图形实体数据、尺寸标注信息和块实体数据的提取过程,对于 ＣＡＤ／ＣＡＰＰ／ＣＡＭ的信息集成有重要意义。     

基于溶胀–熟化机理的疏水缔合聚合物速溶压裂液技术

针对疏水缔合聚合物配制压裂液时分散性能差、溶胀时间长和不适合现场连续混配的问题,综合机械与化学方法,研究了疏水缔合聚合物速溶压裂液技术。通过优化助溶剂加量,减小配液用水的溶度参数,利用负熵因素加快聚合物溶胀速率;同时,设计了同轴双向搅拌装置,提高了固液混合物紊流程度,缩短了聚合物熟化时间。试验结果表明:溶度参数与溶胀胶团直径是影响聚合物溶胀与熟化的关键因素;4%助溶剂可使疏水缔合聚合物的溶胀率在4 min内达到92%;搅拌速率对疏水缔合聚合物熟化时间的影响较小,搅拌方式是影响疏水缔合聚合物熟化速度的主要因素,同轴双向搅拌6 min时的溶胀率达到86%;形成的疏水缔合聚合物速溶压裂液在90 ℃条件下的抗剪切性能大于180 mPa·s,满足现场施工要求。疏水缔合聚合物速溶压裂液技术实现了聚合物压裂液连续混配,降低了聚合物压裂液残液、余液对环境的影响,为大规模体积压裂工厂化作业提供了技术支撑。      

CrMnMo马氏体衬板钢腐蚀条件下的冲击磨损特性及机理

采用MLDF-10冲击腐蚀磨损试验机研究了CrMnMo马氏体衬板钢和CrNiMo马氏体衬板钢在铁矿石酸性矿浆中的冲击磨损特性。结果表明:在相同工况条件下,CrNiMo马氏体衬板钢的冲击腐蚀磨损机制前期主要是挤出硬化棱脱落,后期转变为轻微的腐蚀和浅层疲劳剥落;CrMnMo马氏体衬板钢的冲击腐蚀磨损机制前期主要为显微切削,后期转变为中度腐蚀以及较为深层的疲劳剥落。     

一种新的神经网络自适应逆飞行控制

针对非线性控制提出一套较理想的解决方案。在动态逆控制的基础上,利用神经网络的在线学习能力建立自适应控制结构,结合滑模控制的较强的鲁棒性和瞬态性,两次互补性地补偿误差,从而提高动态逆控制的鲁棒性,解决建模精度不高的问题。仿真结果表明这种方法对高性能无人机飞行控制设计研究具有一定理论指导意义和应用价值。     

凡纳滨对虾的加工利用和产业发展概述

凡纳滨对虾是当今高产的3大养殖对虾品种之一,具有广温广盐杂食性、生长速度快、抗病抗逆力高、适应性能强、营养需求低等突出特点,是一种营养均衡的食源性高蛋白佳品.凡纳滨对虾从1988年引进中国后,90年代初养殖获得成功,2000年后进行了规模化推广,2019年养殖总产量为181.6万t,逐步成为我国对虾养殖的主要品种和渔业...