Impacts of Soil.Water Conservation in Jialing River on Sedimentation of the Three Gorges Reservoir

The Jialing River is one of the main tributaries of the Yangtze River. The average annual runoff accounts for 16 % and the sediment load 26% of the total at Yichang therefore it＇s one of the main contributors of sediment to the Three Gorges Reservoir. Ever since 1989, our country has implemented ＂Yangtze River soil and water conservation＂ project, Till the end of 1996, altogether 25.8 % of erosion area in Jialing River has been improved after large scale conservation has taken effect. The analysis and comparison between records taken before and after the implementation of soil and water conservation on runoff and sediment yield indicated that the sediment load soil erosion in Jialing river basin has been taken under control to some extent. Amount of annual runoff in main conservations have generally dropped by exponential function. Obvious result has been achieved in Jialing River, efficiency of sand reduction is about 10%-25%. Therefore, sediment to Three Gorges Reservoir is decreased accordingly, and it will be beneficial to take advantage of reser- voir＇s synthetic benefit.     

Research and Application on Web Information Retrieval Based on Improved FP-Growth Algorithm

0 IntroductionThe useful texts information in the Web is analyzed bythe method of Web information retrieval according tothe requirement of the user . To get the information of citingtexts and relative key words fromthe Web,we can searchforlots of correlativeinformation data storedinthe Web databaseby Webinformationretrieval .This paper appliedthe method-ology of data mining to Web information retrieval since thepurpose of data miningisto discover thefrequent patternfromthe Web.Alot of studi…     

Dynamically Reconfigurable Encryption System of the AES

Reconfigurable computing has grown to become an important and large field of research, it offers advantages over traditional hardware and software implementations of computational algorithms. The Advanced Encryption Standard （AES） algorithm is widely applied in government department and commerce. This paper analyzed the AES algorithms with different cipher keys, adopted a novel key scheduler that generated the round key real-time, proposed a dynamically reconfigurable encryption system which supported the AES algorithm with different cipher keys, and designed the architecture of the reconfigurable system. The dynamically reconfigurable AES system had been realized on FPGA. The result proves that the reconfigurable AES system is flexible, lower cost and high security level.     

The Primal Exploration of Space launch and Manned Lunar-landing

The lunar-landing is the continuity of manned spaceflight engineering. Comparing with the manned spacecraft engineering, it requires more reliability , larger scale, and more funds. On the basis of China＇ s achievements and the experiences of foreign com~tries, the paper brings forward the idea that using the existing transportation technology to send the launch vehicles and cosmonauts to the near-earth orbit in batches, assembling the components together on the space-launch platform, and then launching them to the moon to fulfill our dream of manned landing on the moon. The paper also discusses the space launch platform and the launching ways.     

写作动因对《富兰克林自传》主题显现的作用

通过对富兰克林写《富兰克林自传》的写作动因的分析,考察了富兰克林所要表达的思想本意或主张,认为写作动因凸显《富兰克林自传》的教育功能,并以此为出发点从两个方面——自我之"本"和本立之"道"进行分析,表明富兰克林的思想意图或主题。     

后发国家自主创新中的政府作为——试述韩国、芬兰的成功实践对中国的启示

在激烈的国际竞争中,自主创新能力薄弱日益成为制约我国经济发展的瓶颈。而创新的成功离不开政府的科学计划和有效组织。值得中国借鉴和学习的后发国家政府作为的国际经验已经很丰富,其中韩国和芬兰重视政府作为的做法对我们打造创新型国家具有参考价值。     

国家农业科技园区技术对接机制的运行模式

技术对接功能是农业科技园区的核心功能之一,国家农业科技园区技术对接机制的运行模式是技术对接效果的决定因素。对国家农业科技园区技术对接机制的涵义及运行模式进行分析,归纳了四种国家农业科技园区技术对接机制运行的模式。     

基于主机的网络防火墙技术及其实现方法

网络防火墙技术在信息安全领域中扮演着十分重要的角色，因此介绍了网络防火墙的分类及特 征，着重阐述了主机型网络防火墙的工作原理和关键技术，并结合Ms Windows操作系统给出了一些具体 实现方法。其主机型防火墙技术必将在解决信息安全方案中占据越来越重要的地位。     

四川盐源西范坪斑岩铜矿的钾长环斑结构及其意义

四川盐源西范坪斑岩铜矿床中存在大量钾长环斑结构。研究表明这一结构是由正在冷凝的岩浆分泌出的成矿流体与刚结晶的斜长石相互作用形成的。在流体 -矿物相互作用过程中 ,流体从已经结晶的矿物尤其是黑云母中萃取出大量铜等成矿物质 ,从而进一步提高了体系的成矿能力。钾长环斑结构的出现不仅为矿床的岩浆热液成因提供了佐证 ,而且是一种良好的找矿标志。     

一类转库问题流向优化问题的模型与解法

转库是大型企业物流管理工作中的重要环节·针对企业决策支持系统的子系统转库作业日计划问题进行了分析,为一类转库流向问题建立了优化模型具有特殊约束0-1整数线性规划问题(0-1ILP)·分析了具体问题的性质·为求解这类NP-难问题,给出了一种在实际中行之有效的求解问题的算法降维替换算法·以SAS语言为环境,用实际问题作为计算算例,对这种算法的优点进行了总结:该算法在实际应用中是切实可行的,在时间上是节约的,尤其适合于大规模的问题