Ionizing Dose Effect of Thermal Oxides Implanted with Si^＋ Ions

Total ionizing dose effects of Si^＋ ion implanted thermal oxides are studied by 10keV x-ray irradiation. Photoluminescence （PL） method is engaged to investigate nanostructures of samples. Ar^＋ implanted samples are also studied by the same way to provide a comparison. The results show that Si^＋ implantation following with high temperature annealing can significantly reduce the radiation induced flatband shift, which is caused by net posi- tive charge accumulation in oxides. This reduction is attributed to the formation of Si nanoscale structures. Ar^＋ implantation is also found to reduce the radiation induced flatband shift, while it is different that the reduction with Si^＋ implantation shows little dependence on implant dose of Ar^＋ ions. This is explained by possible increase of recombination centres.     

TE0导模干涉刻写周期可调亚波长光栅理论研究

通过棱镜耦合激发非对称金属包覆介质波导结构中的TE₀导波模式, 利用两束TE₀模的干涉从理论上实现了周期可调的亚波长光栅刻写. 分析了TE₀模式的色散关系, 刻写亚波长光栅的周期与激发光源、棱镜折射率、光刻胶薄膜厚度及折射率之间的关系. 用有限元方法数值模拟了金属薄膜、光刻胶薄膜和空气多层结构中TE₀导模的干涉场分布. 研究发现, 激发光源波长越短, TE₀ 模干涉刻写的亚波长光栅周期越小; 光刻胶越厚, 刻写的亚波长光栅周期越小; 高折射率光刻胶有利于更小周期亚波长光栅的刻写. 相较于表面等离子体干涉光刻, 基于TE₀ 模的干涉可在厚光刻胶条件下通过改变激发光源、棱镜折射率、光刻胶材料折射率、特别是光刻胶薄膜的厚度等多种方式实现对亚波长光栅周期的有效调控.     

基于压缩感知和深度学习的分类识别技术

雷达对空飞机目标分类可实现雷达装备获得敌机属性和类别信息,对于现代战争其重要性显得尤为突出。针对复杂电磁环境下的飞机目标分类问题,结合防空雷达的特点建立3类（固定翼、螺旋桨和直升机）飞机旋转部件调制回波模型,并理论分析了不同类型飞机目标的微动特征差异。仿真分析在复杂电磁环境下干扰对微动频谱的影响。引入压缩感知方法进行干扰条件下的微动特征稀疏恢复,采用堆栈自编码学习(SAE)方法构建深层神经网络对目标进行自动特征提取和分类识别;实录数据验证表明,本文特征提取和识别方法在干扰比例41%时识别正确率能达到75%。     

IMS网络虚拟化部署分析

在移动互联网时代,虚拟化技术正在改变传统IT技术。重点阐述了核心网虚拟化对设备的要求,深入分析IMS网络虚拟化可行性,最后进一步对全IP架构的IMS网络的云化架构、云化步骤等方面进行了观点阐述。     

Hierarchical Structure, Disassortativity and Information Measures of the US Flight Network

We investigate the mixing structure of directed and evolutionary US flight network. It is shown that such a network is a hierarchical network, with average assortativity coefficient-0.37. Application of the informationbased method that can give the same result provides a way to explore the structure of complex networks.     

二氧化铬阴离子光电子能谱的理论研究

凭借密度泛函理论,采用不同基组对中性分子CrO2的基态((X)3B1)以及阴离子CrO1-的基态((X)4B1)进行几何优化和振动频率分析;应用量化计算得到的力常数及结构和光谱参数,基于推得的两维四模Franck-Condon重叠积分的代数表示,对CrO2((X)3B1)-CrO2-((X)4B1)的光脱附过程进行Franck-Condon分析和光谱模拟,理论上得到光电子能谱的谱线相对强度及振动结构分布,理论谱与实验测得的二氧化铬阴离子光电子能谱达到一致,并对光电子能谱的振动结构进行归属及热带分析;另外,在光谱模拟过程中通过迭代Franck-Condon分析过程,推得CrO2-((X)4B1)与CrO2((X)3B1)平衡几何结构之差:△R(Cr-O)=0.05A,△∠(O-Cr-O)=12°.     

结直肠癌患者血清FTIR光谱的初步研究

对31例结直肠癌患者、8例肠炎患者和10例健康者的血清冻干粉标本进行傅里叶变换红外光谱(fourier transformation infrared spectrum, FTIR)检测,对比分析各组红外光谱特征。结果显示,FTIR检测血清冻干粉获得11个吸收峰,结直肠癌组P9峰位波数蓝移(1 249 cm-1),差异有统计学意义(Z=-2.051, p<0.05);5个吸光度比值组间差异无统计学意义;层序聚类分析法(hierarchical cluster analysis,HCA)显示结直肠癌个体红外光谱具有一定程度的聚类特性;对酰胺Ⅰ带光谱(1 700～1 600 cm-1)进行傅里叶解卷积等处理获得蛋白二级结构的百分含量,组间差异无统计学意义。研究结果初步提供了血清FTIR光谱用于结直肠癌早期诊断的理论依据。     

硅离子注入对全耗尽SIMOX材料总剂量效应的影响

Total dose hardened fully-depleted SOI materials are fabricated on separation by implanted oxygen （SIMOX） materials by silicon ion implantation and annealing. The ID-VG characteristics of pseudo-MOS transistors pre- and post-irradiation are tested with ^60Co gamma rays. The chemical bonds and the structure of Si in the buried oxide are also studied by X-ray photoelectron spectroscopy and cross-sectional high-resolution transmission electron microscopy, respectively. The results show that Si nanocrystals in the buried oxide produced by ion implantation are efficient deep electron traps, which can significantly compensate positive charge buildup during irradiation. Si implantation can enhance the total-dose radiation tolerance of the fully-depleted SOI materials.     

Theoretical study of micro-optical structure fabrication based on sample rotation and two-laser-beam interference

A method for fabricating a micro-optical structure based on sample rotation and two-laser-beam interference is proposed. The rotation process is analyzed using the coordinate transformation in matrix presentation and the theoretical expressions of the optical field distributions corresponding to different sample rotations. By rotating the samples and changing the laser wavelength, various special micro-optical structures can be obtained, such as equally spaced concentric rings and irregular trapezoidal lattices; these structures are demonstrated by simulating the corresponding optical field distributions. The proposed approach may be developed into a low-cost laser interference lithography technology for the fabrication of various micro-optical structures.     

一种可部署在重路由光网络中实现有效连接管理的策略——基于分布式代理与蚁群算法

在大型骨干光网络中, 建立一条从源节点到宿节点的路由至关重要。在集中式网络管理系统体系下, 网络中动态路由信息以及故障状态信息, 通过路由的“泛洪”机制, 被传送到其他节点上实现资源信息共享,这对于连接的迅速建立, 恢复路由的快速启动将是不利的。尝试采用一种启发式算法-蚁群策略, 快速提高光网络中故障恢复的速度。该路由算法平台采用了分布式蚁群算法自动修复故障点, 解决了重路由的快速收敛问题; 依靠分布式代理机制构建管理平面和数据平面相互通信的机制, 完成诸如链路信息素的更新等功能。设计了一个网络故障的场景, 通过实验数据表明, 采用蚁群的分布式路由策略, 可以更快地实现路由信息的汇聚, 找到最佳的恢复路由。