中立型时滞随机微分方程数值解的指数稳定性

讨论了中立型时滞随机微分方程向后欧拉与前后欧拉数值解的几乎处处渐近指数稳定性,结果表明,在给定条件下,对于任意初值,用向后欧拉方法与前后欧拉方法得到非线性中立型时滞随机微分方程的数值解都是几乎处处渐近指数稳定的。     

风浪条件下太湖藻源性“湖泛”的消退及其水体恢复进程

"湖泛"发生后的稳定持续时间是决定其致灾程度的主要指标,风浪的复氧是破坏其稳定性的主要因素.本文采用室内装置模拟、视觉比较和氧化还原条件分析等方法,研究了不同风浪作用下藻源性"湖泛"的稳定性及水体中主要特征参数恢复过程.结果显示:静风对照下,"湖泛"水体黑色在实验过程中始终未消失,水体DO含量保持在约1.5mg/L以下;小风(～2m/s)和中风(～4m/s)下,"湖泛"大约可持续2d左右,"湖泛"消失时的DO含量约6mg/L;大风(～8m/s)下,仅需要14h就可使"湖泛"黑臭完全消失.并且发现,在"湖泛"消失后,保持原来的风速下至144h,没有再出现黑臭的回复;水体溶解性营养物(NH4+和PO43)含量的降低随风浪大小有明显的响应关系.研究结果为藻源性"湖泛"的应急治理提供了决策依据.     

Hacking the optical diffraction limit: Review on recent developments of fluorescence nanoscopy

Subject to the diffraction limit, the resolution of conventional optical microscopy is constrained to about 200 and 500 nm in the lateral and axial planes, respectively. The advantage of optical microscopy in the life sciences over electronic microscopy, especially fluorescence microscopy, drives scientists to develop novel "hacks" to reach nanoscale resolutions by optical means. In this review, three aspects of the techniques are discussed: (1) lateral super-resolution; (2) axial super-resolution; (3) super-resolution in three dimensions. The principles of how the methods achieve the cross-barrier resolution are discussed, and recent advances in current techniques are described. With these methods, the use of fluorescence microscopy is growing quickly toward a new era: fluorescence nanoscopy that will reveal 2 orders of magnitude more information on cellular structure and dynamics.     

An international optical microscopy event-“Focus on Microscopy 2010”

The Focus on Microscopy 2010 (FOM 2010) was held in Shanghai, China from March 28th to March 31st, 2010. It included the 23rd In-ternational Conference on 3D Image Processing in Microscopy, and the 22nd International Conference on Confocal Microscopy. Peking University, Shanghai Jiao Tong University, and the University of Amsterdam were the organizing sponsor universities of the conference. The honorary chairs of the conference were Prof. Bingkun Zhou (Tsinghua University) and Prof. Jie Zhang (Shanghai Jiao Tong University). The conference chairs were Prof. Qiushi Ren (Peking University and Shanghai Jiao Tong University) and Prof. G. J. Brakenhoff (University of Amsterdam, The Netherlands). More than 350 people attended the symposium. Over 200 of the participants were international guests, while 150 were from China. In total, 31 companies participated in the exhibition, generously sponsoring various activities. Carl Zeiss MicroImaging was the main sponsor of the conference this year......     

社会主义和谐社会与法治建设

社会主义和谐社会是一个公平的社会、稳定的社会、人本的社会、利益协调的社会，更是一个法治的社会。和谐社会的实现和运转需要法治机制支撑。法治是社会和谐的前提和基础。我们应通过立法、守法和司法等重要环节，加强法治建设，彰显法治精神，协调利益关系，促进社会和谐、稳定和有序发展。     

基于无字典模型的红外与可见光图像融合分类

针对传统图像分类识别方法采用单一传感器获得图像存在的局限和不足,提出了一种基于红外和可见光融合的分类算法。首先分别对红外图像和可见光图像提取密集型尺度不变特征变换（D-SIFT）,然后采用无字典模型（CLM）变换,并利用空间金字塔匹配（SPM）进行精细划分,最后用混合核支持向量机（SVM-CK）方式将红外和可见光在特征级融合并分类。在VAIS和RGB-NIR两个数据库上对该方法进行验证,融合后分类精度分别比单一图像源均有较大提高;与BoVW方法比较,精度分别提高了4.7%和12.1%。证明多数据源融合的方法综合了红外和可见光各自成像的优势,使获得的特征信息更完善,分类效果显著高于单一数据源的分类结果。