珠江三角洲岸线监管信息平台设计与应用

珠江三角洲是我国经济快速发展的地区之一,但随着人口增长,工业化和城市化进程加快,其河口岸线形态发生了巨大变化。珠江三角洲岸线监管信息平台结合目前计算机及网络技术等学科前沿的优势,在标准与规范的指导下,实现珠江三角洲地图展示、岸线提取、岸线比对、全景、河道断面展示等功能,并建成了河道数据库、涉水建筑数据库、水文数据库、水利数据库和成果数据库,为珠江三角洲河口岸带开发和滩涂围垦提供了科学依据和决策咨询服务。     

太浦闸水量水质联合调度对金泽水库水质影响

金泽水库是上海市黄浦江供水系统的重要组成部分,提高金泽水库水源地水质对保障上海居民饮用水安全具有重要意义。由于金泽水库的清水来源主要是东太湖,故研究了位于东太湖与太浦河之间的太浦闸调度方式对金泽水库水质的影响。分析了太浦河沿线水量水质监测资料,发现金泽水源地流量、水质与太浦闸下泄水量具有明显响应关系,加大太浦闸下泄水量可以减少太浦河两岸支流水量汇入,增加金泽水库水源地太湖清水所占比例,降低水源地关键污染物浓度。在此基础上,考虑金泽水源地水质需求,进一步设计了太浦闸水量水质联合调度方案。通过典型年数值模拟后发现,太浦闸采取水量水质联合调度方式不仅可以改善金泽水源地的水位条件,而且可有效改善该水源地水质,显著降低关键水质指标超过Ⅲ类标准的天数,从而提高金泽水源地取水安全保障程度。     

霍林郭勒褐煤在NaOCl水溶液中的氧化反应

在温和条件下研究霍林郭勒褐煤在NaOCl水溶液中的氧化反应,用乙酸乙酯萃取反应混合物,用重氮甲烷酯化萃取物,通过GC／MS分析,捡测到大量的水溶性苯多酸、脂肪羧酸和一定量的氯代产物。结果表明,NaOCl能有效降解煤中大分子,可作为一种研究煤的结构及其高效利用的有效方法。     

股东代表诉讼浅析

股东代表诉讼制度对于股东特别是中小股东提供维护公司和自身合法权益具有理论和实践意义.通过考察借鉴国外先进的立法例和司法实践经验,析原告资格、公司在股东代表诉讼中的地位以及股东代表诉讼前置程序.     

.Net平台下知识网络系统及其搜索引擎的设计与实现

针对目前学习平台中信息简单罗列、组织层次不清晰的问题,利用.net平台上的ASP.Net、Silver Light技术设计实现了一个B/S架构的知识网络系统。分析了树形结构的特点,提出了递归寻路径法,将知识信息层次清晰地展现给用户,并实现节点间路径的获取。通过对Lucene.Net全文检索技术的研究,将其与SQL Server数据库的索引技术相结合,实现了一个高效的检索引擎。     

基于QRSCU方法的RHD基因的偏好性研究及其应用

Rh血型系统作为人类最复杂的血型系统之一,其临床意义仅次于ABO血型系统.研究人类Rh血型系统中RHD基因对同义密码子的使用偏好性有助于从生物信息学角度了解RHD基因的编码特征.本文基于拟氨基酸编码方法,计算了人类Rh血型系统中RHD基因的同义密码子的相对使用度(quasi relative synonymous codonusage,QRSCU)及4种碱基分别出现在密码子3'端的相对频率(quasi relative frequency of nucleotide to codon3',QRFN3').通过分析计算结果中RHD基因的QRSCU值,得出RHD基因偏好使用以C或G结尾的同义密码子,也说明RHD基因偏好使用密码子-反密码子结合作用强的同义密码子,且避免使用结合作用中度的同义密码子.另外,通过分析计算结果中RHD基因的ORFN3'值,得出RHD基因的同义密码子对后面所接的第一个碱基的使用也有很强的使用偏好性.     

基于嵌入式和RFID技术的电子门票系统

介绍了通过在ARM+μClinux+Web+SQLite平台下扩展CAN总线,并以RFID读卡器作为控制节点而实现的电子门票系统.一方面可以方便持卡者查询门票使用情况、场所路线以及馆内人流量,帮助其更好地选择相关路线;另一方面有助于举办方实时了解各片区的人流情况及追踪目标,以便做出调度和提高安防工作效率.     

Robust and dynamic data aggregation in wireless sensor networks: A cross-layer approach

In-network data aggregation is an effective technique to reduce communication cost in wireless sensor networks. Recent studies have focused on two issues respectively: dynamic aggregation to handle event triggered irregular traffic and robust aggregation to handle packet losses. However, how to achieve both the objectives simultaneously, i.e. dynamic and robust aggregation is still not considered. In this paper, by making use of direct support from MAC layer, we propose a cross-layer approach to realize robust and dynamic data aggregation. A new MAC protocol, DA-MAC is delicately designed to serve such purpose. With channel contention information obtained from DA-MAC, a node can dynamically determine where and when to do aggregation. To cope with packet losses, a virtual overlay, Rings is adopted to forward one packet to multiple nodes. We have conducted numerical analysis to optimize the key parameters and implemented our design in TinyOS based sensor networks. Performance evaluation though simulations and experiments shows that our approach can handle both traffic dynamics and packet losses, with less cost than similar solutions.     

Video-based personalized traffic learning

We present a video-based approach to learn the specific driving characteristics of drivers in the video for advanced traffic control. Each vehicle’s specific driving characteristics are calculated with an offline learning process. Given each vehicle’s initial status and the personalized parameters as input, our approach can vividly reproduce the traffic flow in the sample video with a high accuracy. The learned characteristics can also be applied to any agent-based traffic simulation systems. We then introduce a new traffic animation method that attempts to animate each vehicle with its real driving habits and show its adaptation to the surrounding traffic situation. Our results are compared to existing traffic animation methods to demonstrate the effectiveness of our presented approach.     

Electrochemical behavior of graphene doped carbon paste electrode and its application for sensitive determination of ascorbic acid

In present paper, the graphene doped carbon paste electrode (CPE) was firstly prepared with the addition of graphene into the carbon paste mixture. Compared with conventional CPE, an improved electrochemical response of graphene doped CPE toward the redox couple of Fe(CN)₆^3−/4− was demonstrated owing to the excellent electrical conductivity of graphene. The graphene doped CPE was further used for the successful determination of ascorbic acid (AA), and it showed an excellent electrocatalytic oxidation activity toward AA with a lower overvoltage, pronounced current response, and good sensitivity. Under the optimized experimental conditions, the proposed electrochemical AA sensor exhibited a rapid response to AA within 5 s and a linear calibration plot ranged from 1.0 × 10⁻⁷ to 1.06 × 10⁻⁴ M was obtained with a detection limit of 7.0 × 10⁻⁸ M.