Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…     

移动自组网AODV多路径路由研究

AODV协议是唯一通过IETF批准成为RFC文档的移动自组网按需控制路由协议．分析AODV路由协议工作过程及优缺点，并介绍了几种典型的基于AODV的多路径路由改进协议，最后对这些多路径协议进行优缺点分析及性能比较。     

Hybrid ants-like search algorithms for P2P media streaming distribution in ad hoc networks

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks.     

论民办学校发展的路径依赖和民营化

民办学校要推进民营化改革，使之走出路径依赖，从而健康和快速地发展。     

区间时变细胞神经网络周期解的鲁棒指数稳定性

本文研究一类区间时变扰动神经网络系统周期解的鲁棒指数稳定性.获得了一系列关于鲁棒指数稳定性的判据.     

试论高等院校图书资料资源的网上共享

随着计算机网络的广泛应用，高校师生获取信息、组织信息、使用信息方法和观念的进一步改变，传统的以印刷介质为主要媒体的图书资料系统，已远远不能适应时代的发展，建立数字化、网络化的新型图书资料系统势在必行。本文从实现共享的必要性、可能性，以及文献数据库和网站的建立、维护、更新等方面做了简要的论述，为高校图书资料系统之间实现资源的网上共享提出了方法和途径。     

论我国夫妻法定财产制的立法选择

我国现行夫妻法定财产制存在严重问题，集中体现在夫妻人身关系的剐体主义与夫妻财产关系的一体主义并行所产生的冲突。建构以分别财产制为基础，吸收共同财产制思想的夫妻法定财产制度是我国婚姻法合理的立法选择。     

报网互动：传统报业谋求发展的必由之路

数字时代的新媒体发展对传统媒体的生存和发展提出了更大的挑战。如何突围,取得新优势,获得新发展是传统报业急需解决的课题。加强报网互动,进行优势嫁接,实现互融发展,是助推传统媒体＂突围＂的强大引擎,也是传统媒体谋求发展的必由之路。     

美国维尼社区大学的职业教育概况研究

通过对美国维尼社区大学的研究发现,其高效的管理体制、灵活的招生政策、个性化的教育计划等,对中国的高等职业教育有很多可借鉴之处。美国社区学院几乎是提供了无限的学分和非学分课程、活动等,来丰富社区学院所服务地区人民的生活,满足他们的学习要求。