眼部动作实时识别系统设计

利用网络摄像机和图像处理单元设计了一种眼部动作实时识别系统.该系统首先用帧差法检测出眨眼的动作区域,将此区域设置成感兴趣区域,并用图像形态学算法对其进行处理;然后找出眼部轮廓,并以此区域创建模板,再利用此模板对每一帧图像进行模板匹配,找出匹配中的最小值,以得到识别的结果;最后通过实验验证了该算法的有效性.该系统有广泛的应用前景,如实现模拟鼠标的控制等.     

影响Wheatstone-Panum极限情况融合方式的因素

指出了Wheatstone-Panum极限情况的特征匹配方式究竟是双重融合还是唯一性融合一直存在争议.通过分析发现,Wheatstone-Panum极限情况的研究构型,实际上应分成两类,即Panum类和Wheatstone类,它们在视差梯度和特征搭配方式上存在差异.对这些差异的忽视,可能是导致相关研究得出结论不一致的原因.     

磁性球棒模型在金属晶体结构教学中的应用

为克服常规球棍型晶体结构模型的诸多缺点,提出了一种新型磁性球棒型晶体结构模型,设计出了常见金属晶体结构中所需要的钢球和磁棒的尺寸和个数.简述了该模型在对称元素、晶向指数、晶面指数、配位数、配位多面体和密堆结构堆垛教学中的应用.该模型的使用使金属晶体结构的教学更加生动有趣,极大地提高了教学效果和学生的学习兴趣.     

Synergic catalytic effect of Ti hydride and Nb nanoparticles for improving hydrogenation and dehydrogenation kinetics of Mg-based nanocomposite

The Mg-9.3 wt% (TiH1.971-TiH)?0.7 wt% Nb nanocomposite has been synthesized by hydrogen plasma-metal reaction (HPMR) approach to enhance the hydrogen sorption kinetics of Mg at moderate temperatures by providing nanosizing effect of increasing H “diffusion channels” and adding transition metallic catalysts. The Mg nanoparticles (NPs) were in hexagonal shape range from 50 to 350 nm and the average size of the NPs was 177 nm. The small spherical TiH1.971, TiH and Nb NPs of about 25 nm uniformly decorated on the surface of the big Mg NPs. The Mg-TiH1.971-TiH-Nb nanocomposite could quickly absorb 5.6 wt% H2 within 5 min at 573 K and 4.5 wt% H2 within 5 min at 523 K, whereas the pure Mg prepared by HPMR could only absorb 4 and 1.5 wt% H2 at the same temperatures. TiH1.971, TiH and Nb NPs transformed into TiH2 and NbH during hydrogenation and recovered after dehydrogenation process. The apparent activation energies of the nanocomposite for hydrogenation and dehydrogenation were 45.0 and 50.7 kJ mol?1, which are much smaller than those of pure Mg NPs, 123.8 and 127.7 kJ mol?1. The improved sorption kinetics of the Mg-based nanocomposite at moderate temperatures and the small activation energy can be interpreted by the nanostructure of Mg and the synergic catalytic effects of Ti hydrides and Nb NPs.     

Identity-based blind signature from lattices

Blind signature allows a user to get a signature of a signer on an arbitrary message,and the verifier can convince that the signature is indeed signed by the signer without leaking any information about the message.This property is necessary when the user’s privacy needs protection,such as a bank bill,a trade secret,etc.As an alternative of public key infrastructure,the identity-based system can simplify the key management procedures in certificate-based public key systems.Inspired by the requirement of identity-based blind signature in the post quantum world,we research on identity-based blind signature based on hard lattice problems under the random Oracle model.We propose a construction built upon the blind signature by Rückert,and it is proved to be one-more unforgeable against selective identity and chosen message attacks(s ID-CMA)and unconditionally blind.The proposed scheme has 2 moves,and its security can be reduced to the small integer solution(SIS)problem.     

大字符集简笔汉字输入法

本文把模式识别技术中的特征抽取概念应用于汉字编码，提出了汉字形码输入方案的一种新的设计方法，介绍了用新方法设计的简单易学、高编码效率、低重码率和低重码度的“简笔汉字输入法”。把简笔汉字输入法与其他汉字输入法及西文键盘输入的技术性能作了定量的比较。     

PEO大单体与MMA溶液自由基共聚反应研究

本工作研究了末端为甲基丙烯酸酯型的聚环氧乙烷（ＰＥＯ）大分子单体与甲基丙烯酸甲酯（ＭＭＡ）溶液自由基共聚反应．结果表明，大单体的接枝效率及接枝共聚物的分子量与大单体的投料量及分子量、引发剂的含量、溶剂用量、共聚反应温度及时间有关．     

基于测地主动轮廓和水平集的目标检测方法

针对传统Snake模型在进行目标检测和分割时不能处理拓扑变化以及不能反映出演化曲线的内在几何特性,提出了一种新的目标检测方法——基于水平集的测地主动轮廓模型。该方法采用改进的测地主动轮廓模型,并结合水平集方法,即用水平集函数表示测地主动轮廓模型的曲线演化方程,来模拟初始曲线沿能量下降最快的方向演化的过程。对这种新模型进行研究,将其应用于一些灰度图像的目标检测和分割实验中,实验结果表明,所提出的新方法具有良好的检测效果,对多目标进行了有效分割,并且它能清晰地反映出演化曲线的内在几何特性以及具有良好的拓扑处理能力,这些特性是传统Snake模型所不具有的。     

Primary Sn-rich titianite in the Qitianling granite, Hunan Province, southern China: An important type of tin-bearing mineral and its implications for tin exploration

The Qitianling calc-alkaline granite in Hunan Province (South China) has attracted much attention since the discovery of the Furong super-large tin deposit. The present study provides new mineralogical data to address their implications for exploration of tin deposits. In the Taoxiwo granite in the southeastern part of the Qitianling granite body, Sn-rich titanite was identified as an important type of Sn-bearing mineral. The titanite commonly occurs with biotite as euhedral crystals, exhibiting typical envelope-like shape and sector-zoning texture. These indicate that the titanite most likely crystallized in the magmatic stage. Electron-microprobe analyses show that the titanite is enriched in tin up to 1.12 wt% SnO₂, with an average of 0.43 wt%. With the crystallization of the granite, primary minerals undertook hydrothermal alteration by magma-derived fluids. Subsequently, in the hydrothermal stage, the primary Sn-bearing titanite was altered (at least partially), but still preserved its typical envelope-shaped outline. Micro-scale cassiterite is a representative product of such alteration; other secondary minerals include fluorite, ilmenite, Sn-bearing rutile and quartz. Therefore, the titanite, commonly present in the calcalkaline granites, can be treated as an important Sn-carrying mineral in the Qitianling granite, reflecting the primary magmatic environment with tin enrichment. The hydrothermal alteration of the primary titanite and subsequent crystallization of cassiterite recorded a process of leaching and accumulation of tin in magmatic-hydrothermal evolution of the Sn-bearing granite. Thus, this titanite has important implications for tin exploration. Supported by National Natural Science Foundation of China (Grant Nos. 40730423 and 40221301) and Project of China Geological Survey (Grant No. 1212010632100)     

Space experimental studies of microgravity fluid science in China

Microgravity fluid physics is an important part of microgravity sciences, which consists of simple fluids of many new systems, gas-liquid two-phase flow and heat transfer, and complex fluid mechanics. In addition to the importance of itself in sciences and applications, microgravity fluid physics closely relates to microgravity combustion, space biotechnology and space materials science, and promotes the developments of interdisciplinary fields. Many space microgravity experiments have been performed on board the recoverable satellites and space ships of China and pushed the rapid development of microgravity sciences in China. In the present paper, space experimental studies and the main results of the microgravity fluid science in China in the last 10 years or so are introduced briefly.