Research on Multi Objects Video Tracking Based on TLD Algorithm

图像处理是近年来计算机学科的一个热门研究领域，视频跟踪是其中一个重要的研究课题。视频跟踪融合了机器视觉、模式分类和人工智能等多种先进技术。随着计算机技术的飞速发展，基于视频图像的应用也得到越来越多科研人员的青睐，其中有大量科研成果具有很高的应用价值。 在2009年的ICCV(W)国际会议上，捷克的Z.Kalal提出了一种新颖高效的视频跟踪算法——TLD算法。该算法解决了目前大部分跟踪算法在跟踪失效后不能重新捕获目标的缺点，并且能够很好地适应目标外观的剧烈变化，在给定极少的先验知识的情况下，能够迅速地学习目标特征并进行有效的跟踪。Kalal用多个视频来演示了算法的应用场景：动物行为分析、智能交...Recently, there has been a significant interest in image processing, whin which video tracking is an important subject. Video tracking includes computer vision, pattern recoginition, artifitial intelligence and some other advanced technologies. Since the computer science develops rapidly, the applications based on the video images become much more popular by the scholars, and there has been more a...学位：工学硕士院系专业：信息科学与技术学院自动化系_模式识别与智能系统学号：2322009115289

SYNTHESIS OF FULLERENE CRYSTALS SMALLER THAN C_( 60) BY ION BEAM IRRADIATION OF POLYETHYLENE

通过荷能离子 (包括团簇离子 )辐照聚乙烯首次合成了小于C6 0 的富勒烯———C2 0 和C2 6 分子晶体 .在此基础之上 ,进一步探索其他小富勒烯分子晶体 (如C32 ,C38和C2 4 )存在的确凿证据 .C 20 and C 26 fullerene crystals have been synthesized for the first time by irradiating polyethylene with energetic ions(including cluster ions).Based on this we are now trying to find evidence for the existence of other small fullerenes,such as C 24 ,C 32 ,and C 38 .中国科学院知识创新工程重要方向项目 (批准号 :2 60 10 0 3 1

Photochemical degradation of autochthonous dissolved organic matter from the culture media of Chlorella spp.

利用三维荧光光谱-平行因子分析(EEM-PArAfAC)手段结合吸收光谱分析,研究了小球藻指数期和稳定期培养液中溶解有机物(dOM)在秋季天然太阳辐射作用下的光降解动力学特征.结果表明,小球藻生长过程中除能产生短波激发类腐殖质组分C1(其荧光峰的激发/发射波长位置为240,335nM/406nM)及类蛋白质组分C3(225,275nM/334nM)外,还会形成长波激发类腐殖质组分C2(260,395nM/502nM),表明C2组分并非仅有传统认为的陆源属性,同时也具有自生源属性.稳定期培养液的吸收光谱在250~300nM范围内出现的肩峰,可用于指示水环境中现场自生源的贡献.不同生长时期培养液中dOM的吸收系数和荧光组分的降解动力学都符合一级反应方程.稳定期类腐殖质荧光组分(C1和C2)的光降解程度略高于指数期,但指数期类色氨酸组分(C3)的光降解程度略高于稳定期.经太阳辐照6d后,小球藻培养液的吸收系数A350及各荧光组分的平均损失率分别达到83.0%、84.0%、64.8%和80.0%,对应的半衰期只有1.6~5.0d,揭示出藻类自生来源的dOM具有很强的光化学降解活性.Fluorescence excitation-emission matrix spectroscopy (EEM) and absorption spectroscopy were applied to study the photobleaching of dissolved organic matter (DOM) from the culture media of Chlorella spp.during a six day natural solar radiation in October 2008.Samples from both exponential and stationary phases of algal growth were collected for the photodegradation experiment.The purpose was to investigate the photoreactivity of autochthonous DOM in aquatic environments.Parallel factor analysis (PARAFAC) revealed two humic-like (C1:240, 335 nm/406 nm; C2:260, 395 nm /502 nm) and one protein-like (C3: 225, 275 nm/334 nm) fluorescent components in the culture media.The presence of longer-wavelength-excited humic-like component C2 indicated that this typical ‘terrestrial’ component may also be derived from biological origin.The short-wavelength shoulders at 250--300 nm in the absorption spectra of stationary phase sample may be used as an indicator of in-situ chromophoric DOM (CDOM) production in aquatic environments.The photodegradation dynamics of absorption coefficient and all fluorescent components of DOM from both growth phases followed the first-order reaction process.The loss of humic-like components for stationary phase samples was slightly higher than those of exponential phase samples, while the protein-like component showed the reverse trend.After the six-day natural solar irradiation, the average loss of a350 and fluorescence intensity for C1, C2 and C3 was 83.0%, 84.0%, 64.8% and 80.0%, respectively, corresponding to a half-time between 1.6--5.0 days.These results demonstrated that algal-derived DOM is highly photoreactive and susceptible to photochemical degradation.国家重点基础研究发展计划(973)项目(No.2011CB409804);国家自然科学基金(No.40776041);中央高校基本科研业务费专项资金(No.201112G011)---

The energy and spanning trees of the Aztec diamonds

The Aztec diamond was extensively studied in both graph theory and statistical physics. Knuth obtained a formula of the number of spanning trees of the Aztec diamond with the constrained boundary condition, which solved a conjecture posed by Stanley in 1994. In this paper. We give the formulae of the energy and the number of spanning trees of the Aztec diamond with the toroidal boundary condition. (C) 2010 Elsevier B.V. All rights reserved