信息无障碍焦点问题及解决方案

从目前信息无障碍工作要解决的主要问题出发,分析了视觉障碍者、低收入人群、语言文化差异者在获取信息方面存在的困难,介绍国内外相关技术发展的情况,探讨解决问题的办法。     

一类非线性算子的满射性

Hilbert空间中余弦值不为1的非线性算子构成了一类广泛的特殊的非线性算子.研究了这类非线性算子的满射性,并给出了其成立的几个充分条件.     

Growth mechanism and quantum confinement effect of silicon nanowires

The methods for synthesizing one-dimensional Si nanowires with controlled diameter are introduced. The mechanism for the growth of Si nanowires and the growth model for different morphologies of Si nanowires are described, and the quantum confinement effect of the Si nanowires is presented. Project supported by the National Natural Science Foundation of China (Grant No. 19834080) and Zhou Peiyuan Special Foundation of Mathematics and Physics.     

Bi-amino acid functionalized biomimetic honeycomb chitosan membrane as a multifunctional hydrophilic probe for specific capture of N-linked glycopeptides in nasopharyngeal carcinoma's disease patient's serum

In this work, a novel porous bifunctionalized composite material was synthesized via a simple method. Gold nanoparticles are uniformly dispersed on the surface of the biomimetic honeycomb chitosan membrane through the interaction between amino and Au, and then cysteine and glutathione are successfully grafted onto the surface of the Au by the Au-S bond. The modification of cysteine and glutathione makes this bifunctionalized composite material have significant advantages of superhydrophilicity and small steric hindrance simultaneously. This material manifests excellent property in glycopeptides enrichment, with high selectivity (1:5000), low detection limit (0.1 fmol·μL^–1), high recovery rate (99.4 ± 0.5%), and good repeatability. In addition, with the help of nano-flow liquid chromatography tandem mass spectrometry, this composite achieved excellent performance in efficiently enriching glycopeptides in the serum of healthy people and nasopharyngeal carcinoma's disease patient. More excitingly, further gene ontology analysis of molecular function and biological process indicated that 41 original glycoproteins of the identified glycopeptides from serum of nasopharyngeal carcinoma's disease patient significantly partake in numerous cancer-associated events, including protease binding, calcium ion binding, enzyme binding, extracellular matrix organization, cellular response to tumor necrosis factor, and inflammatory response.     

Enantioselective synthesis of alpha-terpineol and nephthenol by intramolecular acyloxazolidinone enolate alkylations

Enolate anions generated from norterpenyl bromides bearing oxazolidinone chiral auxiliaries at the chain termini underwent efficient, stereo-biased cyclizations to form 6- and 14-membered rings in novel synthetic routes to alpha-terpineol and nephthenol enantiomers.     

Subunit exchange of MjHsp16.5 studied by single-molecule imaging and fluorescence resonance energy transfer

MjHsp16.5 was separately labeled by fluorescent dye Cy3 and Cy5.5. The dissociation event of a single 24-mer MjHsp16.5 molecule was captured by single-molecule imaging (SMI). Temperature-regulated subunit exchange was revealed by the real-time fluorescence resonance energy transfer (FRET). The combination of single-molecular statistics and kinetic parameters from FRET experiments leads to the conclusion that below 75 degrees C the rate-determining step of the subunit exchange was the dissociation of the dye-labeled 24-mer in which the dimer was intact, whereas above 75 degrees C, smaller units emerged in the exchange and the rate-determining step had the character of a bimolecular reaction.     

完备秘密共享方案的信息率

讨论了一类以图为访问结构的秘密共享方案的最优信息率和最优平均信息率．     

量子通信网络安全性研究

随着量子通信的发展，安全问题引起了人们的极大关注。本文分析了量子通信网络安全的意义，并从密钥分发技术、量子加密技术和量子认证技术三个方面归纳了国内外量子通信安全问题的研究进展情况。最后，基于对量子通信网络安全存在的问题，指出了今后该领域的研究方向。     

温度梯度对VLSI金属化布线电徙动特性的影响

设计了一种新型TiW膜自加热结构,产生沿金属化条长方向的温度梯度。文中采用独立的实验和测温金属条结构,利用电阻与温度间的线性关系精确测定金属条上的温度分布,用电阻测温法直接确定电迁徙失效在金属化条上的分布,SEM分析与测试结果一致。不同温度梯度和无温度梯度条件下的实验结果表明,逆向温度梯度能显著提高金属化电徙动失效时间,这可以从温度梯度驱动的热扩散离子流作用得到解释。理论分析和实验结果表明,逆向温度梯度能将金属化电徙动空洞失效位置“推向”阳极,在逆向温度梯度作用下,首次发现了电徙动电阻变化的“新平衡现象”。     

煤及煤焦微观结构特征与气化反应性

研究了不同煤化度煤及煤焦的微观结构及其对气化反应性的影响。结果表明,褐煤焦具有丰富的分支孔系统和较大的比表面积,并含有较多对气化有催化作用的可交换阳离子。无烟煤焦分支孔贫乏,比表面积很小。煤焦的总孔容、比表面积和芳核大小之间有很好的对应关系。不同煤化度煤焦气化反应性差异很大,脱矿物质后煤焦反应性差异显著减小,但是脱矿物质前后煤焦的反应性随煤化程度的变化趋势相似。