Design and Implementation of Streaming Media VOD System Based on Web

随着科学技术的不断发展,网络在人们的日常生活中正发挥越来越重要的作用。计算机、网络通信、多媒体、电视和数字压缩等技术的飞速发展,使人们更易于主动地获取信息,VOD视频点播系统就是一种根据用户需求来播放所需视频节目的系统。这种视频播放方式改变了传统的视频节目被动播放方式为主动点播方式,更加便于用户方便的、快捷的制定个性节目菜单,提高了生活质量,给人们的学习、工作和生活带来了非凡的影响。 本文立足大众化用户的基本需求,同时兼顾高校学生,借助于目前的因特网环境,利用ASP.NET、SQLServer及流式传输技术,对基于Web的流媒体视频点播系统进行研究探索和设计,设计和开发了一个能够实现在线交互...With the development of science and technology, network play an increasingly important role in people's daily life. Computer, The rapid development of computer, network communication, multimedia, television and digital compression technology, makes it easier for people to access information actively, VOD video on demand system is a kind of according to user needs to play the video program system. ...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201123035

关于“经济发展方式转变进程中的财税政策”的探讨(笔谈)

转变经济发展方式是当前中国的热门话题,而上海在城市发展中又肩负着率先转变的重要任务,在这一意义和背景下,2010年4月24日由上海金融学院学院主办、上海金融学院公共经济管理学院承办的“《中国城市财政发展报告2009/2010:促进‘两个中心’建设的上海城市财政》首发式暨‘经济发展方式转变进程中的财税政策’论坛“在我校举行。与会专家围绕经济发展方式转变进程中的财税政策的“趋势与目标“、“机遇和挑战“、“实施方略“和“地方实践“等四个专题进行研讨,各抒己见,智慧交锋。现将其真知灼见整理摘要与读者分享,以期待更多学者共同关注当前经济发展方式转变进程中的财税政策

Phosphorus Storage Capacity and Loss Risk in Coastal Reed Wetland Surrounding Bohai Sea

Coastal wetland,at the intersection of land and sea,is considered as asink,source,andtransformerof phosphorus(P). Coastal wetland plays an important role in the global P cycle,and its ability to retain excessive P in water receives increasing attention. In this study,the coastal reed wetland sediments surrounding the Bohai Sea were sampled to investigate P adsorption capacity and loss risk by conducting batch experiments. Results show that the maximum P adsorption capacity(Q_(max))was 693.7-2 117.2 mg&middot;kg~(-1),with an average of 1 468.6 mg&middot;kg~(-1). The Q_(max) decreased in the order of Qilihai Wetland &gt;Beidagang Wetland &gt;Nandagang Wetland &gt;Liaohe Delta Wetland &gt;Shouguang Coastal Wetland &gt;Yellow River Delta Wetland. The P adsorption capacity was related to the contents of Ca,Mg,and TOC. The degree of P adsorption saturation(DPS)and loss risk index(ERI)of the coastal wetland were 0.28%-4.50% and 0.53%-10.10%,respectively. The ERI suggested that the P loss risk was relatively low for coastal reed wetland surrounding the Bohai Sea except for the moderate loss risk for Shouguang coastal wetland. In summary,the reed coastal wetland around Bohai Sea demonstrated significantly P storage capacity and served as a P sink for water P. We recommend to fully utilize the coastal wetland to reduce point or non-point source pollution(e. g.,P)during the remediation or recovery of the polluted Bohai Sea.</p

Bioavailability and variations of organic phosphorus in sediments of Swan Lake,Rongcheng

Organic phosphorus is an important source of soluble phosphorus via enzyme hydrolysis. It is of great significance to study the bioavailability of organic phosphorus in order to fully understand the mechanism of lake eutrophication. The surface sediments have been collected from a eutrophic coastal lagoon-Swan Lake of Rongcheng. The enzymatic hydrolysis has been used to analyze the bioavailability of organic phosphorus and its temporal and spatial variation. The results show that the contents of organic phosphorus in Swan Lake was 107.9~ 161.9 mg&middot;kg~(-1) with mean content of 125.3 mg&middot;kg~(-1). The content of enzymatic hydrolysis organic phosphorus (EHP) was 21.8~ 100.3 mg&middot;kg~(-1) with mean content of 53.2 mg&middot;kg~(-1) which accounted for 26%~ 56% of the organic phosphorus. The bioavaiability of EHP followed the order of phytic-P (21.5 mg&middot;kg~(-1)) Diester-P(20.7 mg&middot;kg~(-1)) &gt;Monoester-P(14.1 mg&middot;kg~(-1)). The organic phosphorus was concentrated in the estuary and the center lake,which was attributed to the different phosphorus sources,the distribution of aquatic animals and algae and the sediments grain size. Results of The correlation analysis suggest that organic phosphorus was mainly combined with metal oxides (Al、Fe、Mg、Ca) which indicates that the content and the variation of metal oxides would control the hydrolysis and bioavilability of organic phosphorus. In conclusion,the hydrolysis of organic phosphorus played an important role in the source of soluble phosphorus and to a certain extent caused the eutrophication of Swan lake. As a result,much effort should be made on organic phosphorus in the amendments of water pollution.</p

改性膨润土研究进展

概述了天然膨润土的结构和性质,介绍了膨润土在煅烧改性、钠化改性、酸改性、插层改性、有机改性等方面的研究进展,提出了改性膨润土今后的研究方向

Distribution Characteristics of Soil C， N and P in Newly-formed Wetlands of the Yellow Ｒiver Delta， China and Their Stoichiometry Implications

河口湿地是连接陆地生态系统和海洋生态系统的纽带。土壤碳(C)、氮(N)、磷(P)元素是湿地生态系统营养水平的重要指示物,显著影响湿地生态系统的生产力。本文研究了黄河三角洲新生湿地不同植被下土壤C、N、P的分布特征和生态化学计量特征。结果表明,1)黄河三角洲新生湿地C、N、P含量分别为1.2~8.4、0.2~0.8、0.4~0.6g/kg,平均值分别为3.5、0.4、0.5g/kg;土壤表层的C、N、P含量显著高于亚表层。2)黄河三角洲新生湿地C/N、C/P、N/P比值分别为4.62~12.67、2.02~16.39、0.22~1.53,平均值分别为8.77、6.81、0.77。土壤C/N、C/P、N/P比值随土壤剖面深度向下递减,不同植被土壤之间的C/N、C/P、N/P比值有所不同。土壤生态化学计量比值显示黄河三角洲新生湿地土壤有机质分解快,氮的矿化度高。因此,提高该地区土壤有机质的归还,同时适当增加氮肥使用成为湿地生态恢复的优先选项

Distribution Characteristics of Soil C, N and P in Newly-formed Wetlands of the Yellow River Delta, China and Their Stoichiometry Implications

河口湿地是连接陆地生态系统和海洋生态系统的纽带。土壤碳(C)、氮(N)、磷(P)元素是湿地生态系统营养水平的重要指示物,显著影响湿地生态系统的生产力。本文研究了黄河三角洲新生湿地不同植被下土壤C、N、P的分布特征和生态化学计量特征。结果表明, 1)黄河三角洲新生湿地C、N、P含量分别为1.2~8.4、0.2~0.8、0.4~0.6 g/kg,平均值分别为3.5、0.4、0.5 g/kg; 土壤表层的C、N、P含量显著高于亚表层。2)黄河三角洲新生湿地C/N、C/P、N/P比值分别为4.62~12.67、2.02~16.39、0.22~1.53,平均值分别为8.77、6.81、0.77。土壤C/N、C/P、N/P比值随土壤剖面深度向下递减,不同植被土壤之间的C/N、C/P、N/P比值有所不同。土壤生态化学计量比值显示黄河三角洲新生湿地土壤有机质分解快,氮的矿化度高。因此,提高该地区土壤有机质的归还,同时适当增加氮肥使用成为湿地生态恢复的优先选项

铝酸钾溶液碳酸化分解的动力学

对铝酸钾溶液碳酸化分解过程进行研究,建立碳酸化分解过程的动力学模型。借鉴拜耳法晶种分解的动力学模型,对碳分动力学数据进行多元回归,得到动力学方程。结果表明:碳酸化分解的表观活化能为39.2708kJ/mol,说明铝酸钾溶液碳酸化分解需要突破的壁垒小;瞬时晶种量对碳酸化分解过程的影响较小;相比铝酸钠溶液碳酸化分解,苛碱浓度对铝酸钾溶液分解的影响更大。铝酸钾溶液在40~80℃碳化分解,所得氢氧化铝为拜耳石型。</p

铝酸钾溶液碳酸化分解的动力学

对铝酸钾溶液碳酸化分解过程进行研究,建立碳酸化分解过程的动力学模型。借鉴拜耳法晶种分解的动力学模型,对碳分动力学数据进行多元回归,得到动力学方程。结果表明:碳酸化分解的表观活化能为39.2708kJ/mol,说明铝酸钾溶液碳酸化分解需要突破的壁垒小;瞬时晶种量对碳酸化分解过程的影响较小;相比铝酸钠溶液碳酸化分解,苛碱浓度对铝酸钾溶液分解的影响更大。铝酸钾溶液在40~80℃碳化分解,所得氢氧化铝为拜耳石型

铝酸钾溶液碳酸化分解的动力学

对铝酸钾溶液碳酸化分解过程进行研究,建立碳酸化分解过程的动力学模型。借鉴拜耳法晶种分解的动力学模型,对碳分动力学数据进行多元回归,得到动力学方程。结果表明:碳酸化分解的表观活化能为39.2708kJ/mol,说明铝酸钾溶液碳酸化分解需要突破的壁垒小;瞬时晶种量对碳酸化分解过程的影响较小;相比铝酸钠溶液碳酸化分解,苛碱浓度对铝酸钾溶液分解的影响更大。铝酸钾溶液在40~80℃碳化分解,所得氢氧化铝为拜耳石型